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SP230A/234A/235A/236A/237A/238A/241A SP235B/236B/240A/240B/241A/241B
+5V Powered Multi-Channel RS-232 Drivers/Receivers
Operates from Single +5V Power Supply Meets All RS-232D and V.28 Specifications 9V Output Swing with +5V Supply Improved Driver Output Capacity for Mouse Applications Low Power Shutdown - 1A WakeUp Feature in Shutdown Mode 3-State TTL/CMOS Receiver Outputs 30V Receiver Input Levels Low Power CMOS - 5mA Operation Wide Charge Pump Capacitor Value Range - 1-10F
T 1 OUT T2 OUT T2 IN T1 IN GND VCC C1+ V+
1 2 3
16 15 14
T3 OUT T 4 OUT T 4 IN T3 IN VC2 C2 + C1 -
SP234A
4 5 6 7 8
13 12 11 10 9
Now Available in Lead Free Packaging
DESCRIPTION... The SP230A Series are multi-channel RS-232 line drivers/receivers that provide a variety of configurations to fit most communication needs, especially where 12V is not available. Some models feature a shutdown mode to conserve power in battery-powered systems. Some require no external components. All, except one model, feature a built-in charge pump voltage converter, allowing them to operate from a single +5V power supply. All drivers and receivers meet all EIA RS-232D and CCITT V.28 requirements. The Series is available in plastic DIP and SOIC packages.
SELECTION TABLE
Model SP230A SP234A SP235A SP235B SP236A SP236B SP237A SP238A SP240A SP240B SP241A SP241B Power Supplies +5V +5V +5V +5V +5V +5V +5V +5V +5V +5V +5V +5V No. of RS-232 Drivers 5 4 5 5 4 4 5 4 5 5 4 4 No. of RS-232 Rcvrs 0 0 5 5 3 3 3 4 5 5 5 5 External Low Power TTL Wake- No. of Components Shutdown 3-State Up Pins 4 Capacitors Yes No No 20 4 Capacitors No No No 16 None Yes Yes No 24 None Yes Yes Yes 24 4 Capacitors Yes Yes No 24 4 Capacitors Yes Yes Yes 24 4 Capacitors No No No 24 4 Capacitors No No No 24 4 Capacitors Yes Yes No 44 4 Capacitors Yes Yes Yes 44 4 Capacitors Yes Yes No 28 4 Capacitors Yes Yes Yes 28
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC ............................................................................................................................................................... +6V V+ ................................................................................................................... (Vcc-0.3V) to +13.2V V- ............................................................................................................................................................. 13.2V Input Voltages: TIN ....................................................................................................................... -0.3 to (Vcc +0.3V) RIN ............................................................................................................................................................ 30V
Output Voltages: TOUT ................................................................................................. (V+, +0.3V) to (V-, -0.3V) ROUT .............................................................................................................. -0.3V to (Vcc +0.3V) Short Circuit Duration: TOUT ......................................................................................................................................... Continuous Power Dissipation: CERDIP .............................................................................. 675mW (derate 9.5mW/C above +70C) Plastic DIP .......................................................................... 375mW (derate 7mW/C above +70C) Small Outline ...................................................................... 375mW (derate 7mW/C above +70C)
ELECTRICAL CHARACTERISTICS
All units Vcc=+5V10%; except SP235A/B, Vcc=+5V5%; All specifications TMIN to TMAX unless otherwise noted.
PARAMETERS POWER REQUIREMENTS Vcc Power Supply Current Shutdown Supply Current LOGIC INPUTS Input Logic Threshold Low High Logic Pullup Current RS-232 INPUTS RS-232 Input Voltage Range RS-232 Input Threshold Low High RS-232 Input Hysteresis RS-232 Input Resistance LOGIC OUTPUTS Output Voltage Low High Output Leakage Current RS-232 OUTPUTS Output Enable Time Output Disable Time Propagation Delay Instantaneous Slew Rate RS-232 OUTPUTS Transition Region Slew Rate Output Voltage Swing
MIN.
TYP. 5 1
MAX. 10 10
UNITS mA A
CONDITIONS No load, TA= +25C TA = +25C
0.8 2.0 15 -30 0.8 0.2 3 1.2 1.7 0.5 5 200 +30 2.4 1.0 7
Volts Volts A Volts Volts Volts Volts kOhms
TIN ; EN, SD TIN ; EN, SD TIN = 0V
Vcc = 5V, TA = +25C Vcc = 5V, TA = +25C Vcc = 5V TA = +25C, -15V VIN +15V
0.4 3.5 0.05 400 250 1.5 30 10
Volts Volts A ns ns s V/s
IOUT = 3.2mA IOUT = 1.0mA EN = VCC, 0VVOUT Vcc SP235A/B, SP236A/B, SP241A/B SP235A/B, SP236A/B, SP241A/B RS232 to TTL CL = 10pF, RL= 3-7k; TA = +25C CL = 2500pF, RL= 3k; measured from +3V to -3V or -3V to +3V All transmitter outputs loaded with 3k to Ground VCC= 0V; VOUT = 2V Infinite duration
3 5 9
V/s Volts Ohms mA
Output Resistance 300 RS-232 Output Short Circuit Current
10
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
2
Transmitter Output Waveforms
TIN
5V 0V
TIN
5V 0V
0V TOUT
0V TOUT
No load
RL = 3k, CL = 2,500pF
Transmitter Propagation Delay
TIN
TIN
TOUT
TOUT
Rise Time RL = 3k; CL = 2,500pF All inputs = 20kHz
Fall Time RL = 3k; CL = 2,500pF
Receiver Output Waveform
Shutdown to V+, V- Rise Time
SD In
5V 0V V+
0V Out V-
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
3
Receiver Propagation Delay
RIN
RIN
5V 0V
ROUT
5V 0V
ROUT
5V 0V
Fall Time
Rise Time
PINOUT
T3 OUT T1 OUT T2 OUT T2 IN T1 IN GND VCC C1 + V+ C1 -
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
T4 OUT T5 IN NC SD T5 OUT T 4 IN T 3 IN VC2 C2 +
T 1 OUT T2 OUT T2 IN T1 IN GND VCC C1+ V+
1 2 3
16 15 14
T3 OUT T 4 OUT T 4 IN T3 IN VC2 C2 + C1 -
T4 OUT T3 OUT T1 OUT T2 OUT R2 IN R 2 OUT T2 IN T1 IN R 1 OUT R 1 IN GND VCC
1 2 3 4 5
24 23 22 21 20
R3 IN R3 OUT T5 IN SD EN T5 OUT R4 IN R4 OUT T4 IN T3 IN R 5OUT R 5IN
SP234A
4 5 6 7 8
13 12 11 10 9
SP230A
1 2 3 4 5
SP235A
6 7 8 9 10 11 12
19 18 17 16 15 14 13
T4 OUT T3 OUT T1 OUT T2 OUT R2 IN R 2 OUT T2 IN T1 IN R 1 OUT R 1 IN GND VCC
24 23 22 21 20
R3 IN R3 OUT T5 IN SD EN T5 OUT R4 IN R4 OUT T4 IN T3 IN R 5OUT R 5IN
T3 OUT T1 OUT T2 OUT R1 IN R1 OUT T 2IN T1 IN GND VCC C1+ V+ C1-
1 2 3 4 5
24 23 22 21 20
T4 OUT R2 IN R2 OUT SD EN T4 IN T3 IN R 3 OUT R 3 IN VC2 C2 +
T3 OUT T1 OUT T2 OUT R1 IN R1 OUT T 2IN T1 IN GND VCC C1+ V+ C1-
1 2 3 4 5
24 23 22 21 20
T4 OUT R2 IN R2 OUT SD EN T4 IN T3 IN R 3 OUT R 3 IN VC2 C2 +
SP236B
SP235B
SP236A
6 7 8 9 10 11 12
19 18 17 16 15 14 13
6 7 8 9 10 11 12
19 18 17 16 15 14 13
6 7 8 9 10 11 12
19 18 17 16 15 14 13
Date: 8/3/04
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(c) Copyright 2004 Sipex Corporation
4
Receiver Output Enable/Disable Times
5V EN IN 0V 5V EN IN 0V
5V ROUT 0V Disable
5V ROUT 0V Enable
PINOUT
T3 OUT T1 OUT T2 OUT R1 IN R1 OUT T2 IN T1 IN GND VCC C1+ V+ C1-
1 2 3 4 5
24 23 22 21 20
T4 OUT R2 IN R2 OUT T5 IN T5 OUT T4 IN T3 IN R 3OUT R 3IN VC2 C2 +
T2 OUT T1 OUT R 2IN R 2OUT T 1IN R 1 OUT R 1IN GND VCC C1+ V+ C1-
1 2 3 4 5
24 23 22 21 20
T3 OUT R3 IN R3 OUT T4 IN T4 OUT T3 IN T2 IN R 4OUT R 4IN VC2 C2 +
SP237A
SP238A
6 7 8 9 10 11 12
19 18 17 16 15 14 13
6 7 8 9 10 11 12
19 18 17 16 15 14 13
N.C. SHUTDOWN EN T5OUT R4IN R4OUT T4IN T3IN R5OUT R5IN N.C.
T 3OUT T 1OUT T2 OUT R 2 IN
33 32 31 30 29 28 27 26 25 24 23
N.C. N.C. N.C. V- C2- C2+ C1- V+ C1+ N.C. N.C.
1 2 3 4 5 6
28 27 26 25 24 23
T4 OUT R 3 IN R 3 OUT SHUTDOWN (SD) EN R 4 IN R 4 OUT T4 IN T3 IN R 5 OUT R 5 IN VC 2C 2+
T 3OUT T 1 OUT T2 OUT R 2 IN R 2 OUT T2 IN T1 IN R 1 OUT R 1 IN GND VCC C1 + V+ C1 -
1 2 3 4 5 6
28 27 26 25 24 23
T4 OUT R 3 IN R 3 OUT SHUTDOWN (SD) EN R 4 IN R 4 OUT T4 IN T3 IN R 5 OUT R 5 IN VC 2C 2+
44 43 42 41 40 39 38 37 36 35 34
N.C. T5IN R3OUT R3IN T4OUT T3OUT T1OUT T2OUT N.C. R2IN N.C.
1 2 3 4 5 6 7 8 9 10 11
R 2 OUT T2 IN T1 IN R 1 OUT R 1 IN GND VCC C1 + V+ C1 -
SP241A
SP241B
7 8 9 10 11 12 13 14
22 21 20 19 18 17 16 15
7 8 9 10 11 12 13 14
22 21 20 19 18 17 16 15
SP240A/B
Date: 8/3/04
N.C. R2OUT T2IN T1IN R1OUT R1IN GND VCC N.C. N.C. N.C.
12 13 14 15 16 17 18 19 20 21 22
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
5
FEATURES... The multi-channel RS-232 line drivers/receivers provides a variety of configurations to fit most communication needs, especially those applications where 12V is not available. The SP230A, SP235A/B, SP236A/B, SP240A/B, and SP241A/B feature a shutdown mode which reduces device power dissipation to less than 5W. All feature low power CMOS operation, which is particularly beneficial in batterypowered systems. The SP235A/B use no external components and are ideally suited where printed circuit board space is limited. All products in the Series include two charge pump voltage converters which allow them to operate from a single +5V supply. These converters convert the +5V input power to the 10V needed to generate the RS-232 output levels. An internal charge pump converter produces the necessary -12V supply. All drivers and receivers meet all EIA RS-232D and CCITT V.28 specifications. The Series are available for use over the commercial, industrial and military temperature ranges. They are packaged in plastic DIP and SOIC packages. For product processed and screened to MIL-M-38510 and MIL-STD-883C requirements, please consult the factory.
THEORY OF OPERATION The SP230A/B-241A/B series devices are made up of three basic circuit blocks - 1) transmitter, 2) receiver and 3) charge pump. Each model within the series incorporates variations of these circuits to achieve the desired configuration and performance. Driver/Transmitter The drivers are inverting transmitters, which accept TTL or CMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Typically the RS-232 output voltage swing is 9V. Even under worst-case loading conditions of 3k and 2500pF, the output is guaranteed to be 5V, which is consistent with the RS-232 standard specifications. The transmitter outputs are protected against infinite short-circuits to ground without degradation in reliability. The drivers of the SP230A, SP235A/B, SP236A/B, SP240A/B and SP241A/B can be tri-stated by using the SHUTDOWN function. In this "power-off" state, the output impedance will remain greater than 300 Ohms, again satisfying the RS-232 specifications. Should the input of the driver be left open, an internal 400k pull-up resistor to VCC forces the input high, thus committing the output to a low state. The slew rate of the transmitter output is internally limited to a maximum of 30V/s in order to meet the
20kbps
100kbps
10Mbps
10Mbps
64kbps
Table 1. EIA Standards Definition
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
6
standards [EIA RS-232-D 2.1.7, Paragraph (5)]. The transition of the loaded output from VOL to VOH clearly meets the monotonicity requirements of the standard [EIA RS-232-D 2.1.7, Paragraphs (1) & (2)]. Receivers The receivers convert RS-232 input signals to inverted TTL signals. Since the input is usually from a transmission line, where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mV. This ensures that the receiver is virtually immune to noisy transmission lines. The input thresholds are 0.8V minimum and 2.4V maximum, again well within the 3V RS-232 requirements. The receiver inputs are also protected against voltages up to 30V. Should an input be left unconnected, a 5k pulldown resistor to ground will commit the output of the receiver to a high state. In actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied to the receiver circuitry. This occurs, for example, when a PC user attempts to print, only to realize the printer wasn't turned on. In this case an RS-232 signal from the PC will appear on the receiver input at the printer. When the printer power is turned on, the receiver will operate normally. All series devices are fully protected. Again, to facilitate use in "real-world" applications, the receiver outputs can be tri-stated by bringing the ENABLE (EN) pin high, with the driver remaining full active. Charge Pump The charge pump section of the SP230A series allows the circuit to operate from a single +5V, 10% power
10.5 10.0 9.5 9.0 8.5
V+ (Abs.)
S1
S3 V+ = 2VCC + + S4
V
CC
S2
C1
C3
GND
V
CC
INTERNAL OSCILLATOR
Figure 1. Charge Pump Voltage Doubler
supply by generating the required operating voltages internal to the devices. The charge pump consists of two sections -- 1) a voltage doubler and 2) a voltage inverter. As shown in Figure 1, an internal oscillator triggers the charge accumulation and voltage inversion. The voltage doubler momentarily stores a charge on capacitor C1 equal to VCC, reference to ground. During the next transition of the oscillator this charge is boot-strapped to transfer charge to capacitor C3. The voltage across C3 is now from VCC to V+. In the inverter section (Figure 2), the voltage across C3 is transferred to C2 forcing a range of 0V to V+ across C2. Boot-strapping of C2 will then transfer charge to C4 to generate V-. The values of the capacitors are somewhat non-critical and can be varied, however the performance will be affected. As C3 and C4 are reduced, higher levels of ripple will appear. Lower values of C1 and C2 will increase the
10.5 10.0 9.5 9.0 8.5
V- (Abs.)
8.0 7.5 7.0 6.5 6.0 5.5 5.0 0 5 10 15 20 25
V =5.5V CC
8.0 7.5 7.0 6.5 V =5V CC VCC=4.5V V =5.5V CC
V =5V CC VCC=4.5V
6.0 5.5 5.0
30
35
40
0
5
10
15
20
25
30
35
40
a)
V+ IOUT (mA)
b)
V- I OUT (mA)
Charge Pump Output Loading versus VCC; a) V+; b) V-
Date: 8/3/04
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(c) Copyright 2004 Sipex Corporation
7
SD 0 0 1 1
EN 0 1 0 1
Power Up/Down Up Up Down Down
Receiver Outputs Enable Tri-state Enable Tri-state
Table 2. Wake-Up Truth Table
ENABLE Input (EN) The SP235A/B, SP236A/B, SP240A/B, and SP241A/B all feature an enable input (EN), which allows the receiver outputs to be either tri-stated or enabled. The enable input is active low; 0V applied to EN will enable the receiver outputs. This can be especially useful when the receiver is tied directly to a microprocessor data bus. Protection From Shorts to >15V The driver outputs are protected against shorts to ground, other driver outputs, and V+ or V-. For protection against voltages exceeding 15V, two back-to-back zener diodes connected to clamp the outputs to an acceptable voltage level are recommended. (Refer to Figure 3.) Improved Drive Capability for Mouse Applications Each of the devices in this data sheet have improved drive capability for non-standard applications. Although the EIA RS-232D standards specify the maximum loading to be 3k and 2500pF, the SP230A, SP234A, SP235A/B, SP236A/B, SP237A, SP238A, SP240A/B, and SP241A/B can typically drive loads as low as 1k and still maintain 5V outputs. This feature is especially useful when the serial port is intended to be used for a "self-powered" mouse. In this case the voltage necessary to operate the circuits in the mouse can be derived from the RS-232 driver output as long as the loading is 1k (refer to Figure 4). For applications which even exceed this requirement, drivers can be connected in parallel, increasing the drive capability to 750, while maintaining the 5V VOH and VOL levels (refer to Figure 5).
output impedance of V+ and V-, which will degrade VOH and VOL. Capacitor values can be as low as 1.0F. Shutdown (SD) TheSP230A, SP235A/B, SP236A/B, SP240A/ B and SP241A/B all feature a control input which will disable the part and reduce VCC current typically to less than 5A, which is especially useful to designers of battery-powered systems. In the "power-off" mode the receiver and transmitter will both be tri-stated. V+ will discharge to VCC, and V- will discharge to ground. For complete shutdown to occur and the 10A current drain to be realized, the following conditions must be met:
* +5.00V must be applied to the SD pin; * ENABLE must either 0V, +5.0V or not connected; * the transmitter inputs must be either +5.0V or not connected; * VCC must be +5V; * Receiver inputs must be >0V and <+5V
Please note that for proper operation, the SD input pin must never be left floating.
S1 V+
S3 GND + C2 + S4 C4 V- = -(V+)
T1 IN
T1 OUT 15V ZENER
FROM VOLTAGE DOUBLER
GND
S2
T2 IN
INTERNAL OSCILLATOR
T2 OUT 15V ZENER
Figure 2. Charge Pump Voltage Inverter
Figure 3. High Voltage Short Circuit Protection
Date: 8/3/04
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(c) Copyright 2004 Sipex Corporation
8
10 9 8 VOL/VOH (Volts) 7 6 5 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 IOL/IOH (mA) VOL vs IOL VOH vs IOH
T IN
T OUT
Figure 4. Mouse Application Drive Capability
Figure 5. Parallel Drivers
Wake-Up Feature The SP235B, SP236B, SP240B and SP241B have a wake-up feature that keeps all receivers in an enabled state when the device is in the shutdown mode. Table 2 defines the truth table for the wake-up function. Timing for the wake-up function is shown in Figure 6.
If the SP235B, SP236B, SP240B and SP241B are powered up in the shutdown state (SD driven high during VCC power up), the part must remain in a powered on state for a minimum of 3ms before the wake-up function can be used. After the 3ms wait time, there is a 2ms delay time before data is valid for both enable and disable
POWER-UP WITH SD HIGH (charge pump section in shutdown state) t0 (power up) +5V DATA ROUT VALID 0V tWAIT +5V SD 0V POWER-UP WITH SD LOW (charge pump section in active mode) t0 (power up) +5V ROUT 0V +5V SD 0V EXERCISING WAKE-UP FEATURE t0 (power up) +5V ROUT 0V +5V SD 0V SPECIFICATIONS: (VCC =+5V10%, TA=25C) PARAMETER MIN. TYP. tWAIT 2ms tENABLE 1ms tENABLE tWAIT DATA VALID tENABLE DATA VALID DATA VALID tENABLE tENABLE DATA VALID
MAX. 3ms 2ms
Figure 6. Wake-Up and Shutdown Timing
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
9
of the charge pump. If the SP2XXB is powered up with SD low, then only the 2ms delay time will apply (refer to Figure 6). Under normal operation, both the wait time and delay time should be transparent to the user. With only the receivers activated, the device typically draws less than 5A (10A max) supply current. In the case of a modem interfaced to a computer in power-down mode, the RI (ring indicator) signal from the modem would be used to "wake up" the computer, allowing it to accept the data transmission. After the ring indicator signal has propagated through the SP2XXB receiver, it can be used to trigger the power management circuitry of the computer to power up the microprocessor and bring the SD pin to the SP2XXB low, taking it out of shutdown. The receiver propagation delay is typically 1s. The enable time for V+ and V- is typically 2ms. After V+ and V- have settled to their final values, a signal can be sent back to the modem on the DTR (Data Terminal Ready) pin signifying that the computer is ready to accept and transmit data. All receivers that are active during shutdown maintain 500mV (typ.) of hysteresis. Varying Capacitor Values As stated earlier, the capacitor values are somewhat non-critical. Since they are an actual component of the charge pump circuitry, their value will affect its performance, which in turn affects the VOH and VOL levels. There is no upper limit for the value of any of the four capacitors; lower values will impact performance. C1 and C2 are responsible for the charge accumulation and can be reduced to 1F; this will increase the output impedance of V+ and V-. Reducing these capacitor values will limit the ability of the SP2XXA/B to maintain the dc voltages needed to generate the RS-232 output levels. Capacitors C3 and C4 can also be reduced to 1F; doing so will increase the ripple on V+ and V-. Typically each driver will require 1F of capacitance as a minimum to operate within all specified parameters; if five drivers are active in the circuit, then C3 and C4 should be 5F. In order to operate
at these minimum values, the supply voltage must be maintained at +5.0V 5%. Also, the ambient operating temperature must be less than 60C. The capacitor values must be chosen to suit the particular application. The designer must balance board space, cost and performance to maximize the design. The capacitors can be polarized or non-polarized, axial-leaded or surface-mount. As the size and value decrease, so does the cost; however, the value should be chosen to accommodate worst-case load conditions. INTERFACE EXAMPLE - A MODEM ON THE IBM PC SERIAL PORT The RS-232 standard defines 22 serial interface signals. These signals consist of ground lines, timing, data, control and test signals, plus a set of signals rarely used for a second data channel. Many of these signal lines are not used in typical RS-232 applications; in fact, the IBM(R) PC serial port is implemented using only nine pins. For example, consider the case of a PC using this nine pin port to communicate with a peripheral device such as a modem. We see the following activity on each of the RS-232 lines as the computer and modem are activated and communicate with each other as well as the remote modem at the other end of the phone line. Signal Ground (GND) The Signal Ground pin acts as a reference for all the other signals. This pin is simply maintained at a 0V level to serve as a level to which all other signals are referenced. Both the PC and the modem will have this line connected to their respective internal ground lines.
Ring Indicator Data Terminal Ready Data Carrier Detect Signal Ground Data Set Ready Clear To Send Ready To Send Received Data Transmitted Data (To Be Printed)
SP239A
R D R
22 20 8 7 R
D
Ring Indicator Data Terminal Ready
D
Data Carrier Detect Signal Ground
R R D R D
6 5 4 3 2 R R
D D
Data Set Ready Clear To Send Ready To Send
D
Received Data Received Data (To Be Printed)
SP237A
Com
pute
r
Mod
em
IBM Modem Port Interconnections
Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers (c) Copyright 2004 Sipex Corporation
10
Data Terminal Ready (DTR) This is the pin the computer uses to tell peripheral devices that it is on-line and ready to communicate. Data Set Ready (DSR) Peripheral devices use this line to tell the computer that they are on-line and ready to communicate. When the modem is turned on and has completed its self-test routine (assuming it does one), it will send a signal to the PC by asserting this line. Request To Send (RTS) The computer activates this line to notify the peripheral device that it is ready to send data. In this example, the computer notifies the modem that it is ready to send data to be transmitted by the modem. Clear To Send (CTS) This is the line on which the peripheral device tells the computer that it is ready to receive data from the computer. If the modem was not ready, i.e. it was performing a loop-back self-test, for example, it would not assert this line. Once the modem was ready to receive data from the PC, it would assert this line. When it receives the CTS signal from the modem, the PC knows that a data transmission path has been established between itself and the modem. Transmitted Data (TD or TX) This is the pin on which the computer sends the actual data signal to be transmitted, i.e. a positive voltage (+3V to +15V) to represent a logic "0", and a negative voltage (-3V to -15V) to represent a logic "1". The PC would send the data on this line to be transmitted by the modem. Ring Indicator (RI) This line is used by the peripheral device to tell the computer that a remote device wants to start communicating. The modem would activate the RI line to tell the computer that the remote modem was calling, i.e. the phone is ringing. Data Carrier Detect (DCD) This line is used by the modem to tell the computer that it has completed a transmission
path with the remote modem, and to expect to start receiving data at any time. Received Data (RD or RX) This is the pin on which the modem sends the computer the incoming data signal, i.e. a positive voltage (+3V to +15V) to represent a logic "0", and a negative voltage (-3V to -15V) to represent a logic "1".
INTERFACE EXAMPLE - A PRINTER ON THE IBM PC SERIAL PORT The RS-232 standard defines 22 serial interface signals. These signals consist of ground lines, timing, data, control and test signals, plus a set of signals rarely used for a second data channel. Many of these signal lines are not used in typical RS-232 applications; in fact, the IBM(R) PC serial port is implemented using only nine pins. For example, consider the case of a PC using this nine pin port to communicate with a peripheral device such as a printer. We see the following activity on each of the RS-232 lines as the computer and printer are activated and communicate. Signal Ground (GND) The Signal Ground pin acts as a reference for all the other signals. This pin is simply maintained at a 0V level to serve as a level to which all other signals are referenced. Both the PC and the printer will have this line connected to their respective internal ground lines. Data Terminal Ready (DTR) This is the pin the computer uses to tell peripheral devices that it is on-line and ready to communi7 R R D D 6 5 4 2 R R D D
Signal Ground Data Set Ready Clear To Send Ready To Send Transmitted Data (To Be Printed)
Signal Ground Data Set Ready Clear To Send Ready To Send Received Data (To Be Printed)
SP231A/232A
SP231A/232A
Com
pute
r
Prin
ter
IBM Printer Port Interconnections
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
11
cate. Once the computer is powered-up and ready, it will send out a signal on the DTR to inform the printer that it is powered-up and ready to go. The printer really doesn't care, since it will simply print data as it is received. Accordingly, this pin is not needed at the printer. Data Set Ready (DSR) Peripheral devices use this line to tell the computer that they are on-line and ready to communicate. When the printer is turned on and has completed its self-test routine (assuming it does one), it will send a signal to the PC by asserting this line. Request To Send (RTS) The computer activates this line to notify the peripheral device that it is ready to send data. In this example, the computer notifies the printer that it is ready to send data to be printed by the printer. Clear To Send (CTS) This is the line on which the peripheral device tells the computer that it is ready to receive data from the computer. If the printer was not ready, i.e. it was out of paper, for example, it would not assert this line. Once the printer was ready to receive data from the PC, it would assert this line. When it receives the CTS signal from the printer, the PC knows that a data transmission path has been established between itself and the printer. Transmitted Data (TD or TX) This is the pin on which the computer sends the actual data signal representing the actual information to be printed, i.e. a positive voltage (+3V to +15V) to represent a logic "0", and a negative voltage (-3V to -15V) to represent a logic "1". Ring Indicator (RI) This line is used by the peripheral device to tell the computer that a remote device wants to start communicating. A modem would activate the RI line to tell the computer that a remote modem was calling, i.e. the phone is ringing. In the case of a printer, this line is unused. Data Carrier Detect (DCD) This line is used by a peripheral device to tell the computer to expect to start receiving data at any time. Since the printer would not be sending data to the PC in this case this line is not needed.
Received Data (RD or RX) This is the pin on which the computer receives the incoming data signal, i.e. a positive voltage (+3V to +15V) to represent a logic "0", and a negative voltage (-3V to -15V) to represent a logic "1". Again, in this instance, since the printer will not be sending the PC any data, this line is not needed.
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
12
TYPICAL CIRCUITS
+5V INPUT
8 1-10F + 6.3V 10 11 1-10F + 16V 12 C+
1
7 V
CC
1-10F V+
9
+5V INPUT
+ 6.3V
6 C+
1
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter 400k
V-
13
+ 1-10F
16V
7 1-10F + 6.3V 9 10 1-10F + 16V
11
V
1-10F V+ 8
CC
+ 6.3V
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter 400k
T 1 IN
5 400k
T1 T2
400k
2
V-
12
+ 1-10F
16V
T1 OUT
TTL/CMOS INPUTS
RS-232 OUTPUTS
T2 IN
4
3
T 2OUT
T1 IN
TTL/CMOS INPUTS
4 400k
T1 T2
400k
1
T1 OUT
RS-232 OUTPUTS
T3 IN
14 400k
T3 T4
400k
1
T3 OUT
T2 IN
3
2
T2 OUT
T4 IN
15
20
T4 OUT
T3 IN
13 400k
T3 T4
GND 5
16
T3 OUT
T5 IN
19 18 GND 6
T5
16 17
T5 OUT
T4 IN
14
15
T4 OUT
NC
SD
230A
234A
+5V INPUT
+5V INPUT
12
12
V CC
T1 IN 8
V CC
400k
T1 T2 T3 T4 T5
3
T1 OUT
T1 IN
8
400k
T1 T2 T3 T4 T5
3
T1 OUT
TTL/CMOS INPUTS
TTL/CMOS INPUTS
RS-232 OUTPUTS
T3 IN
15
400k
2
T3 OUT
T3 IN
15
400k
2
T3 OUT
T4 IN
16
400k
1
T4 OUT
T4 IN
16
400k
1
T4 OUT
T5 IN
22
400k
19
T5 OUT
T5 IN
22
400k
19
T5 OUT
R 1 OUT
9
R 1
5k
10
R 1 IN
R 1 OUT
9
R 1
5k
10
R 1 IN
TTL/CMOS OUTPUTS
TTL/CMOS OUTPUTS
R 2 OUT
6
R 2
5k
5
R 2 IN
RS-232 INPUTS
R 2 OUT
6
R 2
5k
5
R 2 IN
RS-232 INPUTS
R 3 OUT
23
R 3
5k
24
R 3 IN
R 3 OUT
23
R 3
5k
24
R 3 IN
R 4 OUT
17
R 4
5k
18
R 4 IN
R 4 OUT
17
R 4
5k
18
R 4 IN
R 5 OUT EN
14 20
R 5
GND
11 5k
13 21
R 5 IN SD
R 5 OUT EN
14 20
R 5
GND
11 5k
13 21
R 5 IN SD
235A
235B
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
13
RS-232 OUTPUTS
T2 IN
7
400k
4
T2 OUT
T2 IN
7
400k
4
T2 OUT
TYPICAL CIRCUITS
+5V INPUT
+5V INPUT
10
9
1-10F + 6.3V 12 13 1-10F + 16V
14
C+
1
V CC +5V to +10V Voltage Doubler +10V to -10V Voltage Inverter V+
1-10F
11
10
+ 6.3V
C 1C 2+ C 2-
1-10F + 6.3V 12 13 1-10F + 16V
14
C+
1
9 V CC
1-10F V+
11
+ 6.3V
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter
V-
15
+ 1-10F
16V
V-
15
+ 1-10F
16V
T1 IN
TTL/CMOS INPUTS
7
400k
T1 T2 T3 T4
2
T1 OUT
RS-232 OUTPUTS
T1 IN
7
400k
T1 T2 T3 T4
2
T1 OUT
TTL/CMOS INPUTS
T2 IN
6
400k
3
T2 OUT
T2 IN
6
400k
3
T2 OUT
T3 IN
18
400k
1
T3 OUT
T3 IN
18
400k
1
T3 OUT
T4 IN
19
400k
24
T4 OUT
T4 IN
19
400k
24
T4 OUT
TTL/CMOS OUTPUTS
TTL/CMOS OUTPUTS
R 1 OUT
5
R1
5k
4
R 1 IN
RS-232 INPUTS
R 1 OUT
5
R1
5k
4
R 1 IN
R 2 OUT
22
R2
5k
23
R 2 IN
R 2 OUT
22
R2
5k
23
R 2 IN
R 3 OUT EN
17
R3
5k
16
R 3 IN SD
R 3 OUT EN
17
R3
5k
16
R 3 IN SD
20
21
20
21
GND
8
GND
8
236A
236B
+5V INPUT
+5V INPUT
10
9
1-10F + 6.3V 12 13 1-10F + 16V
14
C+
1
V CC +5V to +10V Voltage Doubler +10V to -10V Voltage Inverter V+
1-10F
11
10
9
+ 6.3V
C 1C 2+ C 2-
1-10F + 6.3V 12 13 1-10F + 16V
14
C+
1
V
1-10F
CC
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter
V+
11
+ 6.3V
V-
15
+ 1-10F
16V
V-
15
+ 1-10F
16V
T1 IN
7
400k
T1 T2 T3 T4 T5
2
T1 OUT
TTL/CMOS INPUTS
T1 IN
5
400k
T1 T2 T3 T4
2
T1 OUT
RS-232 INPUTS
RS-232 INPUTS
TTL/CMOS INPUTS
RS-232 OUTPUTS
T2 IN
6
400k
3
T2 OUT
T2 IN
18
400k
1
T2 OUT
T3 IN
18
400k
1
T3 OUT
T3 IN
19
400k
24
T3 OUT
T4 IN
19
400k
24
T4 OUT
T4 IN
21
400k
20
T4 OUT
T5 IN
21
400k
20
T5 OUT
TTL/CMOS OUTPUTS
R 1 OUT
6
R1
5k
7
R 1 IN
TTL/CMOS OUTPUTS
R 1 OUT
5
R1
5k
4
R 1 IN
R 2 OUT
4
R2
5k
3
R 2 IN
RS-232 INPUTS
R 2 OUT
22
R2
5k
23
R 2 IN
R 3 OUT
22
R3
5k
23
R 3 IN
R 3 OUT
17
R3
5k
16
R 3 IN
R 4 OUT
17
R4
5k
16
R 4 IN
GND
8
GND
8
237A
238A
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
14
RS-232 OUTPUTS
RS-232 OUTPUTS
TYPICAL CIRCUITS
+5V INPUT
19 25
+
C+ 1 C- 1 C+ 2 C- 2
VCC +5V to +10V Voltage Doubler V+
26
4.7F 6.3V
27 28
4.7F 16V
29
+10V to -10V Voltage Inverter
V-
10F 16V 30
+
T1 IN
15
400k
T1 T2 T3 T4 T5
7
+
T1 OUT T2 OUT
TTL/CMOS INPUTS
T3 IN
37
400k
6
T3 OUT
T4 IN
38
400k
5
T4 OUT
T5 IN
2
400k
41
T5 OUT
SP240A/B
16
R 1 OUT
R 1
5k
17
R 1 IN
TTL/CMOS OUTPUTS
R 2 OUT
13
R 2
5k
10
R 2 IN
R 3 OUT
3
R 3
5k
4
R 3 IN
R 4 OUT
39
R 4
5k
40
R 4 IN
R 5 OUT
36
R 5
5k
35
R 5 IN
EN
42
43
GND
18
SD
240A/B
+5V INPUT +5V INPUT
RS-232 INPUTS
RS-232 OUTPUTS
T2 IN
14
400k
8
+
10F 6.3V
12
1-10F + 6.3V 14 15 1-10F + 16V
16
C+
1
11 V CC
12
1-10F V+
13
+ 6.3V
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter
1-10F + 6.3V 14 15 1-10F + 16V
16
C+
1
11 V CC
1-10F V+
13
+ 6.3V
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter
V-
17
+ 1-10F
16V
V-
17
+ 1-10F
16V
T1 IN
TTL/CMOS INPUTS
7
400k
T1 T2 T3 T4
2
T1 OUT
TTL/CMOS INPUTS RS-232 OUTPUTS
T1 IN
7
400k
T1 T2 T3 T4
2
T1 OUT
RS-232 OUTPUTS
RS-232 INPUTS
T2 IN
6
400k
3
T2 OUT
T2 IN
6
400k
3
T2 OUT
T3 IN
20
400k
1
T3 OUT
T3 IN
20
400k
1
T3 OUT
T4 IN
21
400k
28
T4 OUT
T4 IN
21
400k
28
T4 OUT
R 1 OUT
8
R 1
5k
9
R 1 IN
R 1 OUT
8
R 1
5k
9
R 1 IN
TTL/CMOS OUTPUTS
R 2 OUT
R 2
5k
R 2 IN
RS-232 INPUTS
TTL/CMOS OUTPUTS
5
4
R 2 OUT
5
R 2
5k
4
R 2 IN
R 3 OUT
26
R 3
5k
27
R 3 IN
R 3 OUT
26
R 3
5k
27
R 3 IN
R 4 OUT
22
R 4
5k
23
R 4 IN
R 4 OUT
22
R 4
5k
23
R 4 IN
R 5 OUT EN
19 24
R 5
GND
10
18
R 5 IN
SD
R 5 OUT EN
19 24
R 5
GND
10
18
R 5 IN
SD
5k
25
5k
25
241A
241B
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
15
ORDERING INFORMATION
Model ....................................................................................... Temperature Range .................................................................... Package SP230ACP ..................................................................................... 0C to +70C ............................................................................... 20 pin PDIP SP230ACT ..................................................................................... 0C to +70C ............................................................................ 20 pin WSOIC SP230ACT/TR ............................................................................... 0C to +70C ............................................................................ 20 pin WSOIC SP230ACX ..................................................................................... 0C to +70C ............................................................................................ Dice SP230AEP ................................................................................... -40C to +85C ............................................................................. 20 pin PDIP SP230AET ................................................................................... -40C to +85C .......................................................................... 20 pin WSOIC SP230AET/TR ............................................................................. -40C to +85C .......................................................................... 20 pin WSOIC SP234ACP ..................................................................................... 0C to +70C ............................................................................... 16 pin PDIP SP234ACT ..................................................................................... 0C to +70C ............................................................................ 16 pin WSOIC SP234ACT/TR ............................................................................... 0C to +70C ............................................................................ 16 pin WSOIC SP234ACX ..................................................................................... 0C to +70C ............................................................................................ Dice SP234AEP ................................................................................... -40C to +85C ............................................................................. 16 pin PDIP SP234AET ................................................................................... -40C to +85C .......................................................................... 16 pin WSOIC SP234AET/TR ............................................................................. -40C to +85C .......................................................................... 16 pin WSOIC SP235ACP ..................................................................................... 0C to +70C ............................................................................... 24 pin PDIP SP235AEP ................................................................................... -40C to +85C ............................................................................. 24 pin PDIP SP235BCP ..................................................................................... 0C to +70C ............................................................................... 24 pin PDIP SP235BEP ................................................................................... -40C to +85C ............................................................................. 24 pin PDIP SP236ACS ..................................................................................... 0C to +70C ............................................................................... 24 pin PDIP SP236ACT ..................................................................................... 0C to +70C ............................................................................ 24 pin WSOIC SP236ACT/TR ............................................................................... 0C to +70C ............................................................................ 24 pin WSOIC SP236ACX ..................................................................................... 0C to +70C ............................................................................................ Dice SP236AES ................................................................................... -40C to +85C ............................................................................. 24 pin PDIP SP236AET ................................................................................... -40C to +85C .......................................................................... 24 pin WSOIC SP236AET/TR ............................................................................. -40C to +85C .......................................................................... 24 pin WSOIC SP236BCS ..................................................................................... 0C to +70C .............................................................................. 24 pin PDIP SP236BCT ..................................................................................... 0C to +70C ............................................................................ 24 pin WSOIC SP236BCT /TR .............................................................................. 0C to +70C ............................................................................ 24 pin WSOIC SP236BCX ..................................................................................... 0C to +70C ............................................................................................ Dice SP236BES ................................................................................... -40C to +85C ............................................................................. 24 pin PDIP SP236BET ................................................................................... -40C to +85C .......................................................................... 24 pin WSOIC SP236BET /TR ............................................................................ -40C to +85C .......................................................................... 24 pin WSOIC SP237ACS ..................................................................................... 0C to +70C ............................................................................... 24 pin PDIP SP237ACT ..................................................................................... 0C to +70C ............................................................................ 24 pin WSOIC SP237ACT/TR ............................................................................... 0C to +70C ............................................................................ 24 pin WSOIC SP237ACX ..................................................................................... 0C to +70C ............................................................................................ Dice SP237AES ................................................................................... -40C to +85C ............................................................................. 24 pin PDIP SP237AET ................................................................................... -40C to +85C .......................................................................... 24 pin WSOIC SP237AET/TR ............................................................................. -40C to +85C .......................................................................... 24 pin WSOIC
Please consult factory for SP235B, SP236B, SP240B, SP241B, and dice. Available in lead free packaging. To order add "-L" suffix to part number. Example: SP230AEP = standard; SP230AEP-L = lead free /TR = Tape and Reel Pack quantity is 1,500 for WSOIC.
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
16
ORDERING INFORMATION
SP238ACS ..................................................................................... 0C to +70C ............................................................................... 24 pin PDIP SP238ACT ..................................................................................... 0C to +70C ............................................................................ 24 pin WSOIC SP238ACT/TR ............................................................................... 0C to +70C ............................................................................ 24 pin WSOIC SP238ACX ..................................................................................... 0C to +70C ............................................................................................ Dice SP238AES ................................................................................... -40C to +85C ............................................................................. 24 pin PDIP SP238AET ................................................................................... -40C to +85C .......................................................................... 24 pin WSOIC SP238AET/TR ............................................................................. -40C to +85C .......................................................................... 24 pin WSOIC SP240ACF ..................................................................................... 0C to +70C ................................................................ 44 pin Quad Flatpack SP240BCF ..................................................................................... 0C to +70C ............................................................... 44 pin Quad Flatpack SP241ACT ..................................................................................... 0C to +70C ............................................................................ 28 pin WSOIC SP241ACT/TR ............................................................................... 0C to +70C ............................................................................ 28 pin WSOIC SP241AET ................................................................................... -40C to +85C .......................................................................... 28 pin WSOIC SP241AET/TR ............................................................................. -40C to +85C .......................................................................... 28 pin WSOIC SP241BCT ..................................................................................... 0C to +70C ............................................................................ 28 pin WSOIC SP241BCT/TR ............................................................................... 0C to +70C ............................................................................ 28 pin WSOIC SP241BET ................................................................................... -40C to +85C .......................................................................... 28 pin WSOIC SP241BET/TR ............................................................................. -40C to +85C .......................................................................... 28 pin WSOIC
Available in lead free packaging. To order add "-L" suffix to part number. Example: SP230AET/TR = standard; SP230AET-L/TR = lead free /TR = Tape and Reel Pack quantity is 1,500 for WSOIC.
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Date: 8/3/04
+ 5V Powered Multi-Channel RS-232 Drivers/Receivers
(c) Copyright 2004 Sipex Corporation
17

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Price & Availability of SP236A

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