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(R)
SP483E Enhanced Low EMI Half-Duplex RS-485 Transceiver
s +5V Only s Low Power BiCMOS s Driver/Receiver Enable for Multi-Drop configurations s Enhanced ESD Specifications: +15KV Human Body Model +15KV IEC1000-4-2 Air Discharge +8KV IEC1000-4-2 Contact Discharge s Low EMI Transceiver limited to 250kbps
Now Available in Lead Free Packaging
DESCRIPTION The SP483E is a half-duplex transceiver that meets the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on this device to over 15kV for both Human Body Model and IEC1000-4-2 Air Discharge Method. This device is pin-to-pin compatible with Sipex's SP483 device as well as popular industry standards. As with the original version, the SP483E features Sipex's BiCMOS design allowing low power operation without sacrificing performance. The SP483E meet the requirements of the RS-485 and RS-422 protocols up to 250kbps under load. The SP483E is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to 250kbps. The SP483E is also equipped with a low power Shutdown mode.
RO 1 RE 2 DE 3 DI 4
R
8 Vcc 7B 6A
D
SP483E
5 GND
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC............................................................................................................+7V Input Voltages Logic........................................................-0.3V to (VCC+0.5V) Drivers..................................................-0.3V to (VCC+0.5V) Receivers................................................................. 15V Output Voltages Logic........................................................-0.3V to (VCC+0.5V) Drivers...................................................................... 15V Receivers............................................-0.3V to (VCC+0.5V) Storage Temperature.......................................................-65C to +150C Power Dissipation...........................................................................500mW
SPECIFICATIONS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP483E DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage
MIN.
TYP.
MAX.
UNITS
CONDITIONS
GND 2
VCC VCC VCC 0.2 3 0.8 10A 1A 250 250
Volts Volts Volts Volts Volts Volts Volts
Differential Output Voltage 1.5 Change in Magnitude of Driver Differential Output Voltage for Complimentary States Driver Common-Mode Output Voltage Input High Voltage 2.0 Input Low Voltage Input Current Driver Input Control Lines Driver Short-Circuit Current VOUT = HIGH VOUT = LOW SP483E DRIVER AC Characteristics Maximum Data Rate 250 Driver Input to Output Driver Input to Output Driver Skew Driver Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High SP481E/SP485E RECEIVER DC Characteristics Differential Input Threshold Input Hysteresis Output Voltage High Output Voltage Low Three-State (High Impedance) Output Current Input Resistance Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current
SP483EDS/05
Unloaded; R = ; see Figure 1 with load; R = 50; (RS-422); see Figure 1 with load; R = 27; (RS-485); see Figure 1 R = 27 or R = 50; see Figure 1 R = 27 or R = 50; see Figure 1 Applies to DE, DI, RE Applies to DE, DI, RE Applies to DE, DI, RE DI DE, RE -7V VO +12V -7V VO +12V
mA mA
Kbps 800 800 100 2000 2000 800 2000 2000 2000 3000 3000 ns ns ns ns ns ns ns ns
250 250
250 250 250 300 300
RE = 5V, DE = 5V; RDIFF = 54, CL1 = CL2 = 100pF tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 see Figures 3 and 5, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 6
CL = CL = CL = CL = 100pF; see Figures 4 & 6; S2 closed 100pF; see Figures 4 & 6; S1 closed 15pF; see Figures 2 & 8; S1 closed 15pF; see Figures 2 & 8; S2 closed
-0.2 20 3.5
+0.2 0.4 1
Volts mV Volts Volts A k mA mA mA
-7V VCM +12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV 0.4V VO 2.4V; RE = 5V -7V VCM +12V DE = 0V, VCC = 0V or 5.25V, VIN = 12V DE = 0V, VCC = 0V or 5.25V, VIN = -7V 0V VCM VCC
(c) Copyright 2000 Sipex Corporation
12 7
15 +1.0 -0.8 95
SP483E Low EMI Half-Duplex RS485 Transceiver
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SPECIFICATIONS (continued)
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP483E RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output Receiver Input to Output Diff. Receiver Skew ItPLH-tPHLI Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Low Receiver Disable from High SP483E Shutdown Timing Time to Shutdown Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low POWER REQUIREMENTS Supply Voltage Supply Current SP483E No Load SP483E Shutdown Mode ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_P) NSOIC (_N)
MIN.
TYP.
MAX.
UNITS
CONDITIONS
250 250 250 100 45 45 45 45
2000 2000
Kbps ns ns ns
RE = 0V, DE = 0V tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54; CL1 = CL2 = 100pF;
Figures 3 & 7
CRL = 15pF; Figures 2 & 8; S1 closed CRL = 15pF; Figures 2 & 8; S2 closed CRL = 15pF; Figures 2 & 8; S1 closed CRL = 15pF; Figures 2 & 8; S2 closed
70 70 70 70
ns ns ns ns
50
200
600 2000 2000
ns ns ns ns ns
RE = 5V, DE = 0V CL = 100pF; See Figures 4 & 6; S2 closed CL = 100pF; See Figures 4 & 6; S1 closed CL = 15pF; See Figures 2 & 8; S2 closed CL = 15pF; See Figures 2 & 8; S1 closed
300 300
2500 2500
+4.75 900 600
+5.25
Volts A A RE = 0V, DI = 0V or VCC; DE = VCC RE = 0V, DI = 0V or 5V; DE = 0V DE = 0V, RE=VCC
10
A
0 -40 -65
+70 +85 +150
C C C
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
3
PIN FUNCTION
RO 1
R
8
VCC
Pin 1 - RO - Receiver Output. Pin 2 - RE - Receiver Output Enable Active LOW.
RE 2
7
B
Pin 3 - DE - Driver Output Enable Active HIGH. Pin 4 - DI - Driver Input. Pin 5 - GND - Ground Connection.
DE 3
6
A
D
DI 4
SP485
Top View
5
GND
Pin 6 - A - Driver Output/Receiver Input Non-inverting. Pin 7 - B - Driver Output/Receiver Input Inverting. Pin 8 - Vcc - Positive Supply 4.75VSP483E Pinout (Top View)
A R VOD R B Figure 1. RS-485 Driver DC Test Load Circuit VOC Receiver Output
Test Point CRL 1k S1
1k VCC
S2 Figure 2. Receiver Timing Test Load Circuit
DI
A B
CL1 RDIFF CL2
A B
RO 15pF
Output Under C L Test
500
S1
VCC
S2 Figure 4. RS-485 Driver Timing Test Load #2 Circuit
Figure 3. RS-485 Driver/Receiver Timing Test Circuit
+3V DI 0V DRIVER OUTPUT B A
f = 100kHz; tR < 10ns; tF < 10ns 1.5V tPLH VO 1/2VO tDPLH tDPHL tPHL 1/2VO 1.5V
DIFFERENTIAL VO+ OUTPUT 0V VA - VB VO- tSKEW = | tDPLH - tDPHL |
Figure 5. Driver Propagation Delays
SP483EDS/05
tR
tF
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
4
INPUTS RE X X X X DE 1 1 0 1 LINE DI CONDITION 1 No Fault 0 No Fault X X X Fault
OUTPUTS B 0 1 Z Z A 1 0 Z Z
INPUTS RE DE 0 0 0 0 0 0 1 0
OUTPUTS A-B R +0.2V 1 -0.2V 0 Inputs Open 1 X Z
Table 2. Receive Function Truth Table
Table 1. Transmit Function Truth Table
+3V DE 0V 5V A, B VOL VOH A, B 0V
f = 100kHz; tR < 10ns; tF < 10ns 1.5V tZL 2.3V Output normally LOW 1.5V tLZ 0.5V 0.5V tHZ
2.3V tZH
Output normally HIGH
Figure 6. Driver Enable and Disable Times
V0D2+ A-B V0D2- VOH R VOL tPHL
0V
INPUT
0V
1.5V
OUTPUT
1.5V
tPLH f = 100kHz; tR < 10ns; tF < 10ns
tSKEW = | tPHL - tPLH |
Figure 7. Receiver Propagation Delays
+3V RE 0V 5V R VIL VIH R 0V 1.5V
f = 100kHz; tR < 10ns; tF < 10ns 1.5V tZL 1.5V Output normally LOW tLZ 0.5V 0.5V tHZ
1.5V tZH
Output normally HIGH
Figure 8. Receiver Enable and Disable Times
SP483EDS/05 SP483E Low EMI Half-Duplex RS485 Transceiver (c) Copyright 2000 Sipex Corporation
5
DESCRIPTION... The SP483E is a half-duplex differential transceiver that meets the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, the SP483E requires a fraction of the power of older bipolar designs. The RS-485 standard is ideal for multi-drop applications and for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line. Drivers... The driver outputs of the SP483E are differential outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 Volts to +5 Volts. With worst case loading of 54 across the differential outputs, the drivers can maintain greater than 1.5V voltage levels. The drivers have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on DE (pin 3) will tri-state the driver outputs. The SP483E has internally slew rate limited driver outputs to minimize EMI. The maximum data rate for the SP483E drivers is 250 Kbps under load.
Receivers... The SP483E receivers have differential inputs with an input sensitivity as low as 200mV. Input impedance of the receivers is typically 15k (12k minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receivers have a tri-state enable control pin. A logic LOW on RE (pin 2) will enable the receiver, a logic HIGH on RE (pin 2) will disable the receiver. The SP483E receiver is rated for data rates up to 250 Kbps. The receivers are equipped with the fail-safe feature. Fail-safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. Shutdown Mode... The SP483E is equipped with a Shutdown mode. To enable the Shutdown state, both the driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 3) and a logic HIGH on RE (pin 2) will put the SP483E into Shutdown mode. In Shutdown, supply current will drop to typically 1A. ESD TOLERANCE... The SP483E device incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least 15kV without damage nor latch-up. There are different methods of ESD testing applied:
a) MIL-STD-883, Method 3015.7 b) IEC1000-4-2 Air-Discharge c) IEC1000-4-2 Direct Contact
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
6
The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specified in MIL-STD-883, Method 3015.7 for ESD testing. The premise of this ESD test is to simulate the human body's potential to store electro-static energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 9. This method will test the IC's capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. The IEC-1000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and
systems. For system manufacturers, they must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. The premise with IEC1000-4-2 is that the system is required to withstand an amount of static electricity when ESD is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. The test circuit for IEC1000-4-2 is shown on Figure 10. There are two methods within IEC1000-4-2, the Air Discharge method and the Contact Discharge method.
RC RC SW1 SW1
DC Power Source
RS RS SW2 SW2 CS CS
Device Under Test
Figure 9. ESD Test Circuit for Human Body Model
Contact-Discharge Module
RC RC SW1 SW1
DC Power Source
RS RS
RV SW2 SW2
CS CS
Device Under Test
RS and RV add up to 330 for IEC1000-4-2. 330 for
Figure 10. ESD Test Circuit for IEC1000-4-2
SP483EDS/05 SP483E Low EMI Half-Duplex RS485 Transceiver (c) Copyright 2000 Sipex Corporation
7
With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the ESD potential to the system and humidity will tend to change the discharge current. For example, the rise time of the discharge current varies with the approach speed. The Contact Discharge Method applies the ESD current directly to the EUT. This method was devised to reduce the unpredictability of the ESD arc. The discharge current rise time is constant since the energy is directly transferred without the air-gap arc. In situations such as hand held systems, the ESD charge can be directly discharged to the equipment from a person already holding the equipment. The current is transferred on to the keypad or the serial port of the equipment directly and then travels through the PCB and finally to the IC. The circuit model in Figures 9 and 10 represent the typical ESD testing circuit used for all three methods. The CS is initially charged with the DC power supply when the first switch (SW1) is on. Now that the capacitor is charged, the second switch (SW2) is on while SW1 switches off. The
30A
15A
0A t=0ns t Figure 11. ESD Test Waveform for IEC1000-4-2 t=30ns
voltage stored in the capacitor is then applied through RS, the current limiting resistor, onto the device under test (DUT). In ESD tests, the SW2 switch is pulsed so that the device under test receives a duration of voltage. For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5k an 100pF, respectively. For IEC-1000-42, the current limiting resistor (RS) and the source capacitor (CS) are 330 an 150pF, respectively. The higher CS value and lower RS value in the IEC1000-4-2 model are more stringent than the Human Body Model. The larger storage capacitor injects a higher voltage to the test point when SW2 is switched on. The lower current limiting resistor increases the current charge onto the test point.
DEVICE PIN TESTED
Driver Outputs Receiver Inputs
HUMAN BODY MODEL
15kV 15kV
i
Air Discharge
15kV 15kV
IEC1000-4-2 Direct Contact
8kV 8kV
Level
4 4
Table 1. Transceiver ESD Tolerance Levels
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
8
PACKAGE: PLASTIC DUAL-IN-LINE (NARROW)
E1 E
D1 = 0.005" min. (0.127 min.) D
A1 = 0.015" min. (0.381min.) A = 0.210" max. (5.334 max). A2 C O eA = 0.300 BSC (7.620 BSC) L
e = 0.100 BSC (2.540 BSC)
B1 B
ALTERNATE END PINS (BOTH ENDS)
DIMENSIONS (Inches) Minimum/Maximum (mm) A2 B B1 C D E E1 L O
8-PIN 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.355/0.400 (9.017/10.160) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0/ 15 (0/15)
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
9
PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (NARROW)
E
H
h x 45 D A O e B A1 L
DIMENSIONS (Inches) Minimum/Maximum (mm) A A1 B D E e H h L O
8-PIN 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249 0.014/0.019 (0.35/0.49) 0.189/0.197 (4.80/5.00) 0.150/0.157 (3.802/3.988) 0.050 BSC (1.270 BSC) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0/8 (0/8)
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
10
ORDERING INFORMATION
Model Temperature Range Package SP483ECN ....................................................... 0C to +70C ............................................... 8-pin Narrow SOIC SP483ECP ........................................................ 0C to +70C ................................................... 8-pin Plastic DIP SP483EEN ...................................................... .-40C to +85C ............................................. 8-pin Narrow SOIC SP483EEP ...................................................... -40C to +85C ................................................. 8-pin Plastic DIP
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Available in lead free packaging. To order, add "-L" suffix to the part number. Example: SP483ECN = standard; SP483ECN -L = lead free.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
(c) Copyright 2000 Sipex Corporation
11

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