® SP488E and SP489E Enhanced Quad RS-485/RS-422 Line Receivers ■ ■ ■ ■ ■ ■ ■ RS-485 or RS-422 Applications Quad Differential Line Receivers Receiver Output Disable –7V to +12V Common Mode Input Range 1mA Supply Current Single +5V Supply Operation Superior Drop-in Replacement for SN75173, SN75175, LTC488 and LTC489 ■ Improved ESD Specifications: +15kV Human Body Model +15kV IEC1000-4-2 Air Discharge +8kV IEC1000-4-2 Contact Discharge DESCRIPTION… The SP488E and SP489E are low-power quad differential line receivers that meet the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on these devices to over +15kV for both Human Body Model and IEC1000-4-2 Air Discharge Method. These devices are superior drop-in replacements to Sipex's SP488 and SP489 devices as well as popular industry standards. As with the original versions, the SP488E features a common receiver enable control and the SP489E provides independent receiver enable controls for each pair of receivers. Both feature wide common-mode input ranges. The receivers have a fail-safe features which forces a logic "1" output when receiver inputs are left floating. Both are available in 16-pin plastic DIP and SOIC packages. 16 VCC RI1B 1 15 RI4B RI1A 2 14 RI4A RO1 3 4 13 RO4 EN1/EN2 RO2 5 12 EN RI2A 6 11 RI2B 7 GND 8 RI1B 1 RI1A 2 RO1 3 EN SP488E/489EDS/07 SP488E 1 4 2 3 16 VCC 15 RI4B 14 RI4A 4 13 RO4 RO2 5 12 EN3/EN4 RO3 RI2A 6 11 RO3 10 RI3A RI2B 7 10 RI3A 9 RI3B GND 8 9 RI3B SP489E 1 4 2 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 1 3 © Copyright 2000 Sipex Corporation ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these 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 .................................... –0.5V to (VCC +0.5V) Receiver ..................................................... +14V Receiver Output Voltage ........ –0.5V to (VCC +0.5V) Input Currents Logic ........................................................ +25mA Storage Temperature ................. –65°C to +150°C Power Dissipation Plastic DIP .............................................. 375mW (derate 7mW/°C above +70°C) Small Outline .......................................... 375mW (derate 7mW/°C above +70°C) Lead Temperature (soldering, 10 sec) ......... 300°C SPECIFICATIONS VCC = 5V±5%; typicals at 25°C; TMIN ≤ TA ≤ TMAX unless otherwise noted. PARAMETER DC CHARACTERISTICS Digital Inputs Voltage VIL VIH Input Current MIN. TYP. MAX. CONDITIONS EN, EN, EN1/EN2, EN3/EN4 0.8 +2 Volts Volts µA +0.2 kOhm Volts 2.0 RECEIVER INPUTS Input Resistance Differential Input Threshold Input Current (A, B) 12 –0.2 +1.0 –0.8 Maximum Data Rate 10 RECEIVER OUTPUTS Output Voltage VOH 3.5 VOL High Impedance Output Current 0.4 +1 POWER REQUIREMENTS Supply Voltage 4.75 5.00 5.25 Supply Current 1 5 ENVIRONMENTAL AND MECHANICAL Operating Temperature –C 0 +70 –E –40 +85 Storage Temperature –65 +150 Package –_P 16–pin Plastic DIP –_T 16–pin SOIC SP488E/489EDS/07 UNIT mA mA Mbps V V µA Volts mA –7V ≤ VCM ≤ 12V –7V ≤ VCM ≤ 12V VCC = 0V or 5.25V; IIN2 VIN = +12V VIN = –7V IO = –4mA; VID = +0.2V IO = +4mA; VID = –0.2V 0.4V ≤ VO ≤ 2.4V, EN = O, EN = 1, EN1 / EN2 = EN3 / EN4 = O No load °C °C °C SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 2 0V ≤ VIN ≤ VCC © Copyright 2000 Sipex Corporation 100pF EN S1 A 1kΩ VCC RCVR DI DRIVER RCVR 54Ω CL ROn CL B 1kΩ S2 100pF EN 1/4 SP486E 1/4 SP488E Figure 1. Timing Test Circuit Figure 2. Enable/Disable Timing Test Circuit SP488 PINOUT Pin 1 — RI1B — Receiver 1 input B. Pin 6 — RI2A — Receiver 2 input A. Pin 2 — RI1A — Receiver 1 input A. Pin 7 — RI2B — Receiver 2 input B. Pin 3 — RO1 — Receiver 1 Output — If Receiver 1 output is enabled, if RI1A > RI1B by 200mV, Receiver output is high. If Receiver 1 output is enabled, and if RI1A < RI1B by 200mV, Receiver 1 output is low. Pin 8 — GND — Digital Ground. Pin 4 — EN — Receiver Output Enable. Please refer to SP488E Truth Table (1). Pin 11 — RO3 — Receiver 3 Output — If Receiver 3 output is enabled, if RI3A > RI3B by 200mV, Receiver 3 output is high. If Receiver 3 output is enabled, and if RI3A < RI3B by 200mV, Receiver 3 output is low. Pin 9 — RI3B — Receiver 3 input B. Pin 10 — RI3A — Receiver 3 input A. Pin 5 — RO 2 — Receiver 2 Output — If Receiver 2 output is enabled, if RI2A > RI2B by 200mV, Receiver 2 output is high. If Receiver 2 output is enabled, and if RI2A < RI2B by 200mV, Receiver 2 output is low. Pin 12 — EN — Receiver Output Enable. Please refer to SP488E Truth Table (1). PINOUT 16 VCC RI1B 1 15 RI4B RI1A 2 14 RI4A RO1 3 4 13 RO4 EN1/EN2 RO2 5 12 EN RI2A 6 11 RI2B 7 GND 8 RI1B 1 RI1A 2 RO1 3 EN SP488E/489EDS/07 SP488E 1 4 2 3 16 VCC 15 RI4B 14 RI4A 4 13 RO4 RO2 5 12 EN3/EN4 RO3 RI2A 6 11 RO3 10 RI3A RI2B 7 10 RI3A 9 RI3B GND 8 9 RI3B SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 3 SP489E 1 4 2 3 © Copyright 2000 Sipex Corporation Pin 13 — RO4 — Receiver 4 Output — If Receiver 4 output is enabled, if RI4A > RI4B by 200mV, Receiver 4 output is high. If Receiver 4 output is enabled, and if RI4A < RI4B by 200mV, Receiver 4 output is low. Pin 9 — RI3B — Receiver 3 input B. Pin 10 — RI3A — Receiver 3 input A. Pin 15 — RI4B — Receiver 4 input B. Pin 11 — RO3 — Receiver 3 Output — If Receiver 3 output is enabled, if RI3A > RI3B by 200mV, Receiver 3 output is high. If Receiver 3 output is enabled, and if RI3A < RI3B by 200mV, Receiver 3 output is low. Pin 16 — Supply Voltage VCC — 4.75V ≤ VCC ≤ 5.25V. Pin 12 — EN3/EN4 — Receiver 3 and 4 Output Enable. Please refer to SP489E Truth Table (2). SP489E PINOUT Pin 1 — RI1B — Receiver 1 input B. Pin 13 — RO4 — Receiver 4 Output — If Receiver 4 output is enabled, if RI4A > RI4B by 200mV, Receiver 4 output is high. If Receiver 4 output is enabled, and if RI4A < RI4B by 200mV, Receiver 4 output is low. Pin 14 — RI4A — Receiver 4 input A. Pin 2 — RI1A — Receiver 1 input A. Pin 3 — RO1 — Receiver 1 Output — If Receiver 1 output is enabled, if RI1A > RI1B by 200mV, Receiver output is high. If Receiver 1 output is enabled, and if RI1A < RI1B by 200mV, Receiver 1 output is low. Pin 14 — RI4A — Receiver 4 input A. Pin 15 — RI4B — Receiver 4 input B. Pin 16 — Supply Voltage VCC — 4.75V ≤ VCC ≤ 5.25V. Pin 4 — EN1/EN2 — Receiver 1 and 2 Output Enable. Please refer to SP489E Truth Table (2). FEATURES… The SP488E and SP489E are low–power quad differential line receivers meeting RS-485 and RS-422 standards. The SP488E features active high and active low common receiver enable controls; the SP489E provides independent, active high receiver enable controls for each pair of receivers. Both feature tri–state outputs and a -7V to +12V common–mode input range permitting a +7V ground difference between devices on the communications bus. The SP488E/489E are equipped with a fail–safe feature which forces a logic high at the receiver output when the input is left floating. Data rates up to 10Mbps are supported. Both are available in 16-pin plastic DIP and SOIC packages. Pin 5 — RO2 — Receiver 2 Output — If Receiver 2 output is enabled, if RI2A > RI2B by 200mV, Receiver 2 output is high. If Receiver 2 output is enabled, and if RI2A < RI2B by 200mV, Receiver 2 output is low. Pin 6 — RI2A — Receiver 2 input A. Pin 7 — RI2B — Receiver 2 input B. Pin 8 — GND — Digital Ground. DIFFERENTIAL A–B EN ENABLES EN OUTPUT RO VID ≥ 0.2V H X X L H H –0.2V < VID < +0.2V H X X L X X VID ≤ 0.2V H X X L L L X L H Hi–Z Table 1. SP488E Truth Table SP488E/489EDS/07 DIFFERENTIAL A–B ENABLES EN1/EN2 or EN3/EN4 OUTPUT RO VID ≥ 0.2V H H –0.2V < VID < +0.2V H X VID ≤ 0.2V H L X L Hi–Z Table 2. SP489E Truth Table SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 4 © Copyright 2000 Sipex Corporation AC PARAMETERS VCC = 5V±5%; typicals at 25°C; TAMB = 25°C unless otherwise noted. PARAMETER MIN. PROPAGATION DELAY Receiver Input to Output Low to HIGH (tPLH) High to LOW (tPHL) Differential Receiver Skew (tSKD) TYP. MAX. 45 45 5 60 60 RECEIVER ENABLE To Output HIGH 30 60 ns To Output LOW 35 60 ns RECEIVER DISABLE From Output LOW 35 60 ns From Output HIGH 30 60 ns Input A–B CONDITIONS CL = 15pF; Figure 1, 3 ns ns ns tSKD = tPHL - tPLH CL = 15pF; Figures 2 and 4 (S2 closed) CL = 15pF; Figures 2 and 4 (S1 closed) CL = 15pF; Figures 2 and 4 (S1 closed) CL = 15pF; Figures 2 and 4 (S2 closed) F = 1MHZ: tr < 10ns: tf < 10ns +VOD 0V –VOD 0V tPLH tPHL RO UNIT VOH 1.5V VOL 1.5V Figure 3. Receiver Propagation Delays F = 1MHZ: tr < 10ns: tf < 10ns 3V EN 0V 1.5V 1.5V tLZ tZL RO 5V 1.5V Output normally low VOL tZH RO VOH 0V tHZ Output normally high 1.5V 0.5V 0.5V Figure 4. Receiver Enable/Disable Timing SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 5 © Copyright 2000 Sipex Corporation R RS S R RC C SW2 SW2 SW1 SW1 Device Under Test C CS S DC Power Source Figure 5. ESD Test Circuit for Human Body Model Contact-Discharge Module R RSS RC C RV SW2 SW2 SW1 SW1 Device Under Test C CSS DC Power Source RS and RV add up to 330 330Ω Ω ffor or IEC1000-4-2. Figure 6. ESD Test Circuit for IEC1000-4-2 ESD TOLERANCE The SP488E and SP489E devices incorporate 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. 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 5. 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. 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 SP488E/489EDS/07 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 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 6 © Copyright 2000 Sipex Corporation 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. 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 6. There are two methods within IEC1000-4-2, the Air Discharge method and the Contact Discharge method. i➙ 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. 30A The circuit model in Figures 5 and 6 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 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. 15A 0A t=0ns t=30ns t➙ Figure 7. ESD Test Waveform for IEC1000-4-2 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 DEVICE PIN TESTED Driver Outputs Receiver Inputs HUMAN BODY MODEL +15kV +15kV For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5kW an 100pF, respectively. For IEC-1000-4-2, the current limiting resistor (RS) and the source capacitor (CS) are 330W 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. Air Discharge IEC1000-4-2 Direct Contact +15kV +15kV +8kV +8kV Level 4 4 Table 3. Transceiver ESD Tolerance Levels SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 7 © Copyright 2000 Sipex Corporation PACKAGE: PLASTIC DUAL–IN–LINE (NARROW) E1 E D1 = 0.005" min. (0.127 min.) A1 = 0.015" min. (0.381min.) D A = 0.210" max. (5.334 max). C A2 e = 0.100 BSC (2.540 BSC) Ø L B1 B eA = 0.300 BSC (7.620 BSC) ALTERNATE END PINS (BOTH ENDS) DIMENSIONS (Inches) Minimum/Maximum (mm) SP488E/489EDS/07 16–PIN A2 0.115/0.195 (2.921/4.953) B 0.014/0.022 (0.356/0.559) B1 0.045/0.070 (1.143/1.778) C 0.008/0.014 (0.203/0.356) D 0.780/0.800 (19.812/20.320) E 0.300/0.325 (7.620/8.255) E1 0.240/0.280 (6.096/7.112) L 0.115/0.150 (2.921/3.810) Ø 0°/ 15° (0°/15°) SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 8 © Copyright 2000 Sipex Corporation PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (WIDE) E H D A Ø e B A1 L DIMENSIONS (Inches) Minimum/Maximum (mm) SP488E/489EDS/07 16–PIN A 0.093/0.104 (2.352/2.649) A1 0.004/0.012 (0.102/0.300) B 0.013/0.020 (0.330/0.508) D 0.398/0.413 (10.10/10.49) E 0.291/0.299 (7.402/7.600) e 0.050 BSC (1.270 BSC) H 0.394/0.419 (10.00/10.64) L 0.016/0.050 (0.406/1.270) Ø 0°/8° (0°/8°) SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 9 © Copyright 2000 Sipex Corporation ORDERING INFORMATION Quad RS485 Receivers: Model ........................ Enable/Disable ...................................... Temperature Range ........................ Package SP488ECP ............... Common; active Low and Active High .. 0°C to +70°C .................... 16–pin Plastic DIP SP488ECT ................ Common; active Low and Active High .. 0°C to +70°C ............................. 16–pin SOIC SP488EEP ................ Common; active Low and Active High .. –40°C to +85°C ................ 16–pin Plastic DIP SP488EET ................ Common; active Low and Active High .. –40°C to +85°C ......................... 16–pin SOIC SP489ECP ............... One per driver pair; active High SP489ECT ................ One per driver pair; active High SP489EEP ................ One per driver pair; active High SP489EET ................ One per driver pair; active High ............ 0°C to +70°C .................... 16–pin Plastic DIP ............ 0°C to +70°C ............................. 16–pin SOIC ............ –40°C to +85°C ................ 16–pin Plastic DIP ............ –40°C to +85°C ......................... 16–pin SOIC Please consult the factory for pricing and availability on a Tape-On-Reel option. 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: [email protected] 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. SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers 10 © Copyright 2000 Sipex Corporation