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| PRELIMINARY INFORMATION (R) SP488A and SP489A High Speed Quad RS-485/RS-422 Line Receivers s High Speed Versions of Sipex's SP488 & SP489 s 30Mbps Transmission Rates s Quad Differential Line Receivers s RS-485 or RS-422 Applications s Tri-state Output Control s 30ns Typical Receiver Propagation Delays s -7V to +12V Common Mode Input Range s 1mA Supply Current s Single +5V Supply Operation s Pin Compatible with SN75173, SN75175, LTC488 and LTC489 DESCRIPTION... The SP488A and SP489A are high speed quad differential line receivers capable of meeting the RS-485 and RS-422 protocols while running at five times the normal transmission rates. The SP488A and SP489A are enhanced versions of Sipex's SP488 and SP489 quad RS-485/RS-422 line receivers. The SP488A features a common receiver enable control; the SP489A provides independent receiver enable controls for each pair of receivers. Both feature tri-state outputs and wide common-mode input range. The receivers have a fail-safe feature which forces a logic "1" output when receiver inputs are left floating. Both are available in 16-pin plastic DIP and SOIC packages. RI1B RI1A RO1 EN RO2 RI2A RI2B GND 1 2 3 4 5 6 7 8 SP488A 1 4 16 15 14 13 12 VCC RI4B RI4A RO4 EN RO3 RI3A RI3B RI1B RI1A RO1 EN1/EN2 RO2 RI2A RI2B GND 1 2 3 4 5 6 7 8 SP489A 1 4 16 15 14 13 12 VCC RI4B RI4A RO4 EN3/EN4 RO3 RI3A RI3B 2 3 11 10 9 2 3 11 10 9 SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers (c) Copyright 2000 Sipex Corporation 1 PRELIMINARY INFORMATION 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 ............................................ -65C to +150C Power Dissipation Plastic DIP ........................................................................ 375mW (derate 7mW/C above +70C) Small Outline .................................................................... 375mW (derate 7mW/C above +70C) Lead Temperature (soldering, 10 sec) ................................... 300C SPECIFICATIONS VCC = 5V5%; typicals at 25C; TMIN TA TMAX unless otherwise noted. PARAMETER DC CHARACTERISTICS Digital Inputs Voltage VIL VIH Input Current RECEIVER INPUTS Input Resistance Differential Input Threshold Input Current (A, B) MIN. TYP. MAX. UNIT CONDITIONS EN, EN, EN1/EN2, EN3/EN4 0.8 2.0 2 Volts Volts A 0V VIN VCC 12 -0.2 +0.2 +1.0 -0.8 kOhm Volts mA mA Mbps Maximum Data Rate 30 RECEIVER OUTPUTS Output Voltage VOH 3.5 VOL High Impedance Output Current -7V VCM 12V -7V VCM 12V VCC = 0V or 5.25V; IIN2 VIN = +12V VIN = -7V 0.4 +1 V V A IO = -4mA; VID = +0.2V IO = +4mA; VID = -0.2V EN = O, EN = VCC, EN1/EN2 = O, EN3/EN4 = O, 0.4V VO 2.4V POWER REQUIREMENTS Supply Voltage 4.75 5.25 Supply Current TBD 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 Volts mA No load C C C SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers (c) Copyright 2000 Sipex Corporation 2 PRELIMINARY INFORMATION AC PARAMETERS VCC = 5V5%; typicals at 25C; 0C TA +70C unless otherwise noted. PARAMETER MIN. PROPAGATION DELAY Receiver Input to Output Low to HIGH (tPLH) High to LOW (tPHL) Differential Receiver Skew (tSKD) Receiver Rise Time (tR) SP488A SP489A Receiver Fall Time (tF) SP488A SP489A RECEIVER ENABLE To Output HIGH To Output LOW RECEIVER DISABLE From Output LOW From Output HIGH TYP. MAX. UNIT CONDITIONS CL = 15pF; Figure 1, 3 TBD TBD TBD TBD TBD TBD TBD TBD TBD ns ns ns ns ns 10% to 90% 90% to 10% ns ns ns ns 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) TBD TBD ns ns Input A-B +VOD -VOD tPHL F = 1MHZ: tr < 10ns: tf < 10ns 0V tPLH 0V RO VOH VOL 1.5V 1.5V Figure 1. Receiver Propagation Delays 3V EN 0V tZL RO 5V VOL tZH RO VOH 0V F = 1MHZ: tr < 10ns: tf < 10ns 1.5V tLZ 1.5V 1.5V Output normally low tHZ Output normally high 1.5V 0.5V 0.5V Figure 2. Receiver Enable/Disable Timing SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers (c) Copyright 2000 Sipex Corporation 3 PRELIMINARY INFORMATION PINOUT RI1B RI1A RO1 EN1/EN2 RO2 RI2A RI2B GND 1 2 3 4 5 6 7 8 16 15 VCC RI4B RI4A RO4 EN3/EN4 RO3 RI3A RI3B RI1B RI1A RO1 EN RO2 RI2A RI2B GND 1 2 3 4 5 6 7 8 SP488A 1 4 16 15 14 13 12 VCC RI4B RI4A RO4 EN RO3 RI3A RI3B SP489A 1 4 14 13 12 2 3 11 10 9 2 3 11 10 9 SP488A PINOUT Pin 1 -- RI1B -- Receiver 1 input B. 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 4 -- EN -- Receiver Output Enable. Please refer to SP488A Truth Table (1). 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. Pin 9 -- RI3B -- Receiver 3 input B. Pin 10 -- RI3A -- Receiver 3 input A. 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 12 -- EN -- Receiver Output Enable. Please refer to SP488A Truth Table (1). 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 15 -- RI4B -- Receiver 4 input B. Pin 16 -- Supply Voltage VCC -- 4.75V VCC 5.25V. SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers (c) Copyright 2000 Sipex Corporation 4 PRELIMINARY INFORMATION 50pF EN A S1 RCVR ROn CL 1k VCC DI DRIVER B 54 RCVR CL 1k S2 50pF EN 1/4 SP488 1/4 SP486 Figure 3. Timing Test Circuit Figure 4. Enable/Disable Timing Test Circuit SP489A PINOUT Pin 1 -- RI1B -- Receiver 1 input B. 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 4 -- EN1/EN2 -- Receiver 1 and 2 Output Enable. Please refer to SP489A Truth Table (2). 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. Pin 9 -- RI3B -- Receiver 3 input B. Pin 10 -- RI3A -- Receiver 3 input A. 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 12 -- EN3/EN4 -- Receiver 3 and 4 Output Enable. Please refer to SP489A Truth Table (2). 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 15 -- RI4B -- Receiver 4 input B. Pin 16 -- Supply Voltage VCC -- 4.75V VCC 5.25V. SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers (c) Copyright 2000 Sipex Corporation 5 PRELIMINARY INFORMATION DIFFERENTIAL A-B VID 0.2V -0.2V < VID < +0.2V VID 0.2V X EN H X H X H X L ENABLES EN X L X L X L H OUTPUT RO H H X X L L Hi-Z DIFFERENTIAL A-B VID 0.2V -0.2V < VID < +0.2V VID 0.2V X ENABLES EN1/EN2 or EN3/EN4 H H H L OUTPUT RO H X L Hi-Z Table 2. SP489A Truth Table Table 1. SP488A Truth Table FEATURES... The SP488A and SP489A are low-power quad differential line receivers meeting RS-485 and RS-422 serial protocol. The SP488A and SP489A feature Sipex's BiCMOS process allowing low power operational characteristics of CMOS technology while meeting all of the demands of the RS-485 and RS-422 serial protocols over 10Mbps under load in harsh environments. In fact, the SP488A and SP489A can transmit signals up to 30Mbps. The RS-485 standard is ideal for multi-drop applications and for long-distance communication. 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. Normally an RS-485 driver will produce no less than 1.5V before cable attenuation. After cable loss, the signal may degrade and have an amplitude of less than 1.0V. The receiver input sensitivity of the SP488A and SP489A allows the devices to receive signals as low as 200mV. The SP488A features active high and active low common receiver enable controls; the SP489A 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 SP488A/489A are equipped with a fail-safe feature which forces a logic high at the receiver output when the input is left floating. Both are available in 16-pin plastic DIP and SOIC packages. SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers (c) Copyright 2000 Sipex Corporation 6 PRELIMINARY INFORMATION ORDERING INFORMATION Quad RS485 Receivers: Model ........................ Enable/Disable ...................................... Temperature Range ........................ Package SP488ACP ............... Common; active Low and Active High .. 0C to +70C .................... 16-pin Plastic DIP SP488ACT ................ Common; active Low and Active High .. 0C to +70C ............................. 16-pin SOIC SP488AEP ................ Common; active Low and Active High .. -40C to +85C ................ 16-pin Plastic DIP SP488AET ................ Common; active Low and Active High .. -40C to +85C ......................... 16-pin SOIC SP489ACP ............... One per driver pair; active High ............ 0C to +70C .................... 16-pin Plastic DIP SP489ACT ................ One per driver pair; active High ............ 0C to +70C ............................. 16-pin SOIC SP489AEP ................ One per driver pair; active High ............ -40C to +85C ................ 16-pin Plastic DIP SP489AET ................ One per driver pair; active High ............ -40C to +85C ......................... 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: 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. SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers (c) Copyright 2000 Sipex Corporation 7 |
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