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19-0198; Rev 0; 10/93
+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown
_______________General Description
The MAX563 is a +3.3V-powered EIA/TIA-562 transceiver with two transmitters and two receivers. Because it implements the EIA/TIA-562 standard, the MAX563 communicates with RS-232 transceivers, yet consumes far less power; this makes it ideal for battery-powered, hand-held computers. And, the MAX563 guarantees a 116kbps data rate while maintaining 3.7V EIA/TIA-562 signal levels, which makes it compatible with LapLinkTM software. An on-board charge pump converts the +3.3V supply to the 6.6V needed to produce the EIA/TIA-562 output voltage levels. Four 0.1F charge-pump capacitors and a bypass capacitor of similar size are the only external components required. When the MAX563's charge pumps and transmitters are shut down to save power, the receivers remain active to continuously monitor signals from external devices (for example, ring indicator from modems). The two receivers' outputs can be enabled and disabled independently of the shutdown function to allow two ports--generally of different types--to be wire-OR connected at the UART.
____________________________Features
o Guaranteed Interoperability with RS-232 o Operates from a Single +3.0V to +3.6V Supply o 2 Drivers, 2 Receivers o Receivers Active in Shutdown Mode o Low-Power Shutdown: 10A Max o Small Package--18-Pin Wide SO o Three-State TTL/CMOS Receiver Outputs o 116kbps Guaranteed Data Rate
MAX563
______________Ordering Information
PART MAX563CPN MAX563CWN MAX563C/D TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 18 Plastic DIP 18 Wide SO Dice *
________________________Applications
Handiterminals Battery-Powered Equipment Bar-Code Readers Notebook and Palmtop Computers
* Dice are specified at TA = +25C.
__________Typical Operating Circuit
+3.3V C3
__________________Pin Configuration
ALL CAPACITORS 0.1F +6.6V V+ 3
2 C1+ C1
17 VCC
TOP VIEW
4 C1- VOLTAGE DOUBLER 5 C2+ 6 C2VOLTAGE INVERTER VCC V-
-6.6V 7 C4
EN 1 C1+ 2 V+ 3 C1- 4
18 SHDN 17 VCC 16 GND
C2
400k 12 T1IN CMOS INPUTS 400k 11 T2IN 13 R1OUT CMOS OUTPUTS
MAX563
15 T1OUT 14 R1IN 13 R1OUT 12 T1IN 11 T2IN 10 R2OUT
T1OUT 15 VCC T2OUT 8 R1IN 14 5k RS-562/RS-232 INPUTS ON/OFF RS-562 OUTPUTS
C2+ 5 C2- 6 V- 7 T2OUT 8 R2IN 9 DIP/SO
10 R2OUT 1 EN 5k GND
R2IN 9 SHDN 18
TM LapLink is a registered trademark of Traveling Software, Inc.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown MAX563
ABSOLUTE MAXIMUM RATINGS
Power Supply Ranges Supply Voltage (VCC) ...........................................-0.3V to +6V Input Voltages TIN.........................................................-0.3V to (VCC -0.3V) RIN ...............................................................................25V TOUT (Note 1)...................................................................15V Output Voltages TOUT .............................................................................15V ROUT ....................................................-0.3V to (VCC +0.3V) Driver/Receiver Output Short Circuit to GND.........Continuous Continuous Power Dissipation (TA = +70C) Plastic DIP ....................................................................889mW Wide SO .......................................................................762mW Operating Temperature Range...............................0C to +70C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: Input voltage measured with TOUT in high-impedance state. SHDN or VCC = 0V.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = 3.0V to 3.6V, C1-C4 = 0.1F, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER RS-562 TRANSMITTERS Output Voltage Swing Data Rate Input Logic Threshold Low Input Logic Threshold High Logic Pull-Up/Input Current Output Leakage Current Transmitter Output Resistance Output Short-Circuit Current RS-232/RS-562 RECEIVERS Input Voltage Operating Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance Output Voltage Low Output Voltage High Output Leakage Current EN Input Threshold Low EN Input Threshold High VIL VIH 2.4 RIN VOL VOH IOUT = 3.2mA IOUT = -0.5mA EN = VCC, 0V VOUT VCC VIL VIH VCC = 3.3V VCC = 3.3V SHDN = VCC = 3.3V (no hysteresis when SHDN = 0V) 2.4 0.1 3 0.5 5 0.2 VCC-0.6 VCC-0.2 0.05 10 0.6 1.0 7 0.4 25 0.4 V V V V k V V A V V VIL VIH SHDN = VCC SHDN = 0V VCC = 3.6V, SHDN = 0V, VOUT = 15V VCC = SHDN = 0V, VOUT = 15V VCC = V+ = V- = 0V, VOUT = 2V VOUT = 0V 300 2.4 2 0.01 0.01 0.01 10M 15 60 20 1 10 10 All transmitter outputs loaded with 3k to GND RL = 3k, CL = 1000pF, TA = +25C 3.7 4.5 200 116 0.6 V kbps V V A A mA SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.0V to 3.6V, C1-C4 = 0.1F, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER POWER SUPPLY Operating Supply Voltage VCC Supply Current Shutdown Supply Current SHDN Input Leakage Current SHDN Threshold Low SHDN Threshold High AC CHARACTERISTICS Transition Slew Rate tPHLT tPLHT tPHLR tPLHR tPHLS tPLHS tER tDR tET tDT tPHLT - tPLHT tPHLR - tPLHR CL = 50pF to 2500pF, RL = 3k to 7k, VCC = 3.3V, TA = +25C, measured from +3V to -3V or -3V to +3V (Note 2) Figure 2 Figure 3 Figure 3 Figure 4 Figure 4 Includes charge pump start-up Figure 5 4 6 1.3 1.5 0.5 0.6 0.5 2.5 125 160 300 600 300 100 30 3.5 3.5 1.0 1.0 10.0 10.0 500 500 V/s VIL VIH 2.4 VCC ICC ICC No load RL = 3k on both outputs, inputs static Figure 1 TA = +25C TA = TMIN to TMAX 3.0 3 8 0.1 2 0.1 10 50 1 0.6 3.6 8 V mA A A V V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX563
Transmitter Propagation Delay Receiver Propagation Delay (Normal Operation) Receiver Propagation Delay (Shutdown) Receiver-Output Enable Time Receiver-Output Disable Time Transmitter-Output Enable Time Transmitter-Output Disable Time Transmitter Propagation Delay Skew Receiver Propagation Delay Skew (Normal Operation)
s s s ns ns s ns ns ns
Note 2: Minimum slew rate is specified with CL = 1000pF for data rates above 20kbps, corresponding with EIA/TIA-562.
__________________________________________________________________________
+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown MAX563
______________________________________________________________Pin Description
PIN 1 2 3 4 5 6 7 8, 15 9, 14 10, 13 11, 12 16 17 18 NAME EN C1+ V+ C1C2+ C2VT2OUT, T1OUT R2IN, R1IN R2OUT, R1OUT T2IN, T1IN GND VCC SHDN FUNCTION Receiver enable. Connect EN to GND to enable receivers, and take EN high to disable receivers. Positive terminal of positive charge-pump capacitor. +2VCC voltage generated by the positive charge pump. The voltage on V+ collapses to VCC when SHDN is low. Negative terminal of positive charge-pump capacitor. Positive terminal of inverting charge-pump capacitor. Negative terminal of inverting charge-pump capacitor. -2VCC voltage generated by the inverting charge pump. The voltage on V- collapses to GND when SHDN is low. EIA/TIA-562 voltage-level transmitter outputs. These outputs are disabled (Hi-Z) when SHDN is low. EIA/TIA-562 and EIA/TIA-232 voltage-level receiver inputs. CMOS receiver outputs. These outputs are active regardless of the state of SHDN. They are enabled when EN is low, and disabled (Hi-Z) when EN is high. CMOS driver inputs. Ground. +3.0V to +3.6V supply voltage. Shutdown control. Connect to GND to shut down the charge pumps and the transmitters. Take high to turn on the charge pumps and to enable the transmitters.
_______________Detailed Description
The MAX563 consists of three sections: charge-pump voltage converters, transmitters (drivers), and receivers. Both the transmitters and the receivers are inverting.
EIA/TIA-562 Transmitters
The MAX563's drivers are inverting level translators that convert +3V logic inputs to EIA/TIA-562 voltage levels. With a VCC supply of only 3.0V, the driver outputs deliver the EIA/TIA-562 3.7V minimum specification under worst-case conditions--when both transmitters are loaded with 3k receivers (either EIA/TIA-232 or EIA/TIA-562). The transmitters are fast: the guaranteed data rate with standard loads is 116kbps, which is the highest rate commonly used by PC-to-PC communication software, such as LapLink. The highest practical data rate may be reduced if the other communicating device (RS-562 or RS-232) is not as fast, or if the cables present an excessive capacitive load (>1000pF). Each transmitter is designed to drive a single receiver; transmitters can be paralleled to drive multiple receivers. When SHDN is low, the driver outputs are turned off. Their output leakage currents are less than 10A when pulled to GND or when driven to 15V. This enables two transmitters to be connected to the same line, provided that one of them is always disabled by taking SHDN low.
+3V to 6V, Dual Charge-Pump Voltage Converter
Two charge pumps either invert or double the incoming VCC to generate the voltages required by the transmitters. The first charge pump uses capacitor C1 to double VCC; the resulting voltage is stored on the V+ reservoir capacitor. The second charge pump uses capacitor C2 to invert V+; this negative voltage is stored on the V- capacitor. When SHDN is low, the charge pumps are turned off, V+ is pulled down to VCC by a 1k resistor, and Vrises to GND. It is possible to draw some power from the V+ and Vpins for external use. However, doing so diminishes the charge-pump output voltages and reduces noise margins, so it is not recommended.
4
_______________________________________________________________________________________
+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown MAX563
ISHDN +3.6V 0.1F C1+ 0.1F C1VCC V+ V+ OV VtPLHT T1 & T2 +3.6V TIN R1 & R2 TOUT 3k RIN +3.6V 5k +3V GND INPUT 50% 50% 0V tPHLT INPUT OV 0.1F +3V
MAX563
0.1F C2+ V CC C2400k
V0.1F
OUTPUT
ROUT 0V +3.6V DRIVE EN SHDN
Figure 2. Transmitter Propagation Delay Timing
Figure 1. Shutdown Current Test Circuit
The inputs of unused drivers may be left unconnected because they have internal 400k pull-ups to V CC. Unused inputs may also be connected to GND or VCC, but VCC provides lower power consumption because of the internal pull-ups.
VCC OUTPUT 50% 50% GND tPLHR tPLHS
tPHLR tPHLS
EIA/TIA-562 and EIA/TIA-232 Receivers
The MAX563's receivers convert 3.7V to 13.2V EIA/TIA-562 signal levels into +3V logic levels; they are rated to receive signals up to 25V to accommodate EIA/TIA-232 signals as well. Both receivers invert. Their inputs are each equipped with an internal 5k (nominal) terminating resistor connected to ground, and the input logic thresholds are 0.4V and 2.4V. The positive logic-low threshold (VIL) ensures the receiver outputs remain high whenever their inputs are left open. The receivers are active when EN is low, and have high-impedance outputs when EN is high. When SHDN is high, the receivers have hysteresis. This produces clean output transitions, even with slowmoving input signals that exhibit moderate amounts of noise and ringing. When shut down, the receivers have no hysteresis, and the propagation delay increases.
Figure 3. Receiver Propagation Delay Timing
and have hysteresis. When active in shutdown mode (EN = SHDN = low), the receivers operate at reduced power and speed, and without hysteresis. The charge pumps and transmitters operate only when SHDN is high; they are unaffected by EN. When shut down (SHDN = low) or unpowered (VCC = 0V), the transmitter outputs are high impedance if they are backdriven with voltages not exceeding 15V. The pullup resistors at the driver inputs are disconnected in shutdown mode to save power. During shutdown, V+ is pulled down to VCC, and V- rises to GND.
Shutdown and Enable Control
The SHDN and EN controls are independent. Both receivers are always active when EN is low. With EN low and SHDN high, the receivers operate at full speed
_______________________________________________________________________________________ 5
+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown MAX563
EN INPUT VCC 0V 0V tER VCC - 0.6V V+ RECEIVER OUTPUT CL = 150pF +0.4V +3.7V 0V VCC -3.7V EN INPUT 0V tDR VOH - 0.1V RL = 1k VOL + 0.1V 0.5VCC 1 OR 0 TX 3k 50pF A. TIMING DIAGRAM VtDT SHDN +3V
RECEIVER OUTPUTS
Figure 4. Receiver Output Enable and Disable Timing
B. TEST CIRCUIT
__________Applications Information
Charge-Pump Capacitor Selection
Normally, 0.1F capacitors can be used for all locations. To reduce output ripple, increase the values of the V+ and V- capacitors. If your capacitors have a very wide tolerance, consider using a nominal value a little larger than 0.1F to ensure that the actual capacitance does not fall below about 80nF. For circuits designed to operate over a wide range of temperatures, consider using slightly larger capacitors to compensate for any loss of capacitance at temperature extremes. No advantage is gained by using values larger than 10F.
Figure 5. Transmitter Output Disable Timing
Power-Supply Decoupling
Use a capacitor with the same value as the chargepump capacitors.
6
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+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown MAX563
Table 1. Summary of EIA/TIA-232E/V.28 and EIA/TIA-562 Specifications
PARAMETER Driver Output Voltage 0 Level 1 Level Maximum Output Level Signal Rate (3k RL 7k) Receiver Input Thresholds 0 Level 1 Level Maximum Input Level Maximum Instantaneous Slew Rate Maximum Driver Output Short-Circuit Current Transition Rate on Driver Output Driver Output Resistance with Power Off -2V < VOUT < 2V CONDITION EIA/TIA-232E/V.28 SPECIFICATION 5.0V to 15.0V -5.0V to -15.0V No load CL = 2500pF CL = 1000pF 25V Up to 20kbps Not defined 3.0V to 15.0V -3.0V to -15.0V 25V 30V/s 100mA V.28 1ms or 3% of the period RS-232 4% of the period 300 EIA/TIA-562 SPECIFICATION 3.7V to 13.2V -3.7V to -13.2V 13.2V Up to 20kbps Up to 64kbps 3.0V to 15.0V -3.0V to -15.0V 25V 30V/s 60mA 4V/s 300
3k to 7k load
Table 2. DB9/DB25 Cable Connections Commonly Used for EIA/TIA-232E, EIA/TIA-562 and V.24 Asynchronous Interfaces
DB9 PIN 1 2 3 4 5 6 7 8 9 DB25 PIN 8 3 2 20 7 6 4 5 22 NAME Received Line Signal Detector (sometimes called Data Carrier Detect) Receiver Data Transmit Data Data Terminal Ready Signal Ground Data Set Ready Request to Send Clear to Send Ring Indicator SYMBOL DCD RxD TxD DTR GND DSR RTS CTS RI FUNCTION Handshake from DCE Data from DCE Data from DTE Handshake from DTE Reference point for signals Handshake from DCE Handshake from DTE Handshake from DCE Handshake from DCE
_______________________________________________________________________________________
7
+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown MAX563
___________________Chip Topography
V+ C1+ EN C1-
SHDN GND V CC
T1 OUT C2+
C2VR1 IN
0.105" (2.667 mm)
R1 OUT T2 OUT T2 IN 0.070" (1.778 mm) R2 OUT
T1 IN R2 IN
TRANSISTOR COUNT: 189; SUBSTRATE CONNECTED TO V+.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1993 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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