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| (R) SP3481/SP3485 +3.3V Low Power Half-Duplex RS-485 Transceivers with 10Mbps Data Rate RS-485 and RS-422 Transceivers Operates from a single +3.3V supply Interoperable with +5.0V logic Driver/Receiver Enable Low Power Shutdown Mode (SP3481) -7V to +12V Common-Mode Input Voltage Range Allows up to 32 transceivers on the serial bus Compatibility with the industry standard 75176 pinout Driver Output Short-Circuit Protection DESCRIPTION The SP3481 and the SP3485 are a family of +3.3V low power half-duplex transceivers that meet the specifications of the RS-485 and RS-422 serial protocols. These devices are pin-topin compatible with the Sipex SP481, SP483, and SP485 devices as well as popular industry standards. The SP3481 and the SP3485 feature Sipex's BiCMOS process, allowing low power operation without sacrificing performance. The SP3481 and SP3485 meet the electrical specifications of RS-485 and RS-422 serial protocols up to 10Mbps under load. The SP3481 is equipped with a low power Shutdown mode. RO 1 RE 2 DE 3 DI 4 R 8 Vcc 7B 6A D SP3481 and SP3485 5 GND 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 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 ............................................................................................. +6.0V Input Voltages Logic ..................................................... -0.3V to +6.0V Drivers ................................................... -0.3V to +6.0V Receivers ............................................................ 15V Output Voltages Drivers .................................................................. 15V Receivers .............................................. -0.3V to +6.0V Storage Temperature ................................................ .-65C to +150C Power Dissipation per Package 8-pin NSOIC (derate 6.90mW/oC above +70oC) ..................... 600mW 8-pin PDIP (derate 11.8mW/oC above +70oC) ...................... 1000mW SPECIFICATIONS TAMB = TMIN to TMAX and VCC = +3.3V 5% unless otherwise noted. PARAMETERS SP3481/SP3485 DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complimentary States Driver Common-Mode Output Voltage Input High Voltage Input Low Voltage Input Current Driver Short-Circuit Current VOUT = HIGH VOUT = LOW SP3481/SP3485 DRIVER AC Characteristics Maximum Data Rate Driver Input to Output, tPLH Driver Input to Output, tPHL MIN. TYP. MAX. UNITS CONDITIONS GND 2 1.5 VCC VCC VCC 0.2 3 Volts Volts Volts Volts Volts Volts Volts A mA mA Unloaded; R = ; Figure 1 with load; R = 50; (RS-422); Figure 1 with load; R = 27; (RS-485); Figure 1 R = 27 or R = 50; Figure 1 R = 27 or R = 50; Figure 1 Applies to DE, DI, RE Applies to DE, DI, RE Applies to DE, DI, RE -7V VO +12V -7V VO +12V 2.0 0.8 10 250 250 10 20 20 40 40 2 5 52 60 40 60 60 60 10 20 120 120 120 120 Mbps ns ns ns ns ns ns ns ns RE = VCC, DE = VCC Figures 2 and 8 Figures 2 and 8 tDO1 - tDO2 Figures 2 and 9 From 10% to 90% ; Figures 3 and 9 Figures 4 and 10 Figures 5 and 10 Figures 5 and 10 Figures 4 and 10 Differential 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 SP3481/SP3485 RECEIVER DC Characteristics Differential Input Threshold -0.2 Input Hysteresis Output Voltage High VCC-0.4 Output Voltage Low Three-State (High Impedance) Output Current Input Resistance 12 Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current 7 10/15/02 +0.2 20 0.4 +1 15 1.0 -0.8 60 Volts mV Volts Volts A k mA mA mA -7V VCM +12V VCM = 0V VID = +200mV, -1.5mA VID = -200mV, 2.5mA 0V VO VCC; RE = VCC -7V VCM +12V DE = 0V, VCC = 0V or 3.6V, VIN = 12V DE = 0V, VCC = 0V or 3.6V, VIN = -7V 0V VCM VCC (c) Copyright 2000 Sipex Corporation SP3481/3485 Low Power Half-Duplex RS485 Transceivers 2 SPECIFICATIONS (continued) TAMB = TMIN to TMAX and VCC = +3.3V 5% unless otherwise noted. PARAMETERS SP3481/SP3485 RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output, tPLH MIN. TYP. MAX. UNITS CONDITIONS 10 40 70 100 70 100 70 Mbps ns ns ns ns ns RE = 0V, DE = 0V Figures 6 and 11 TAMB = +25oC, VCC = +3.3V, Figures 6 and 11 Receiver Input to Output, tPHL 40 70 Figures 6 and 11 TAMB = +25oC, VCC = +3.3V, Figures 6 and 11 tRSKEW = tRPHL - tRPLH, Figures 6 and 11 Differential Receiver Skew Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Low Receiver Disable from High SP3481 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 Current SP3481/3485 No Load SP3481 Shutdown Mode 4 35 35 35 35 60 60 60 60 ns ns ns ns Figures 7 and 12; S1 closed, S2 open Figures 7 and 12; S2 closed, S1 open Figures 7 and 12; S1 closed, S2 open Figures 7 and 12; S2 closed, S1 open RE = 3.3V, DE = 0V 50 75 65 65 50 50 200 150 150 200 200 ns ns ns ns ns Figures 4 and 10 Figures 5 and 10 Figures 7 and 12; S2 closed, S1 open Figures 7 and 12; S1 closed, S2 open 1000 800 2000 1500 10 A A A RE, DI = 0V or VCC; DE = VCC RE = 0V, DI = 0V or VCC; DE = 0V DE = 0V, RE=VCC 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 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 SP3481/SP3485 Pinout (Top View) DESCRIPTION The SP3481 and the SP3485 are 2 members in the family of +3.3V low power half-duplex transceivers that meet the specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin compatible with the Sipex SP481, SP483, and SP485 devices as well as popular industry standards. The SP3481 and the SP3485 feature Sipex's BiCMOS process allowing low power operation without sacrificing performance. Drivers The driver outputs of the SP3481 and SP3485 are differential outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 Volts to +3.3 Volts. With a load of 54 across the differential outputs, the drivers maintain greater than 1.5V voltage levels. The drivers of the SP3481 and SP3485 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 tranceivers in the SP3481 and SP3485 operate up to 10Mbps. The 250mA I SC maximum limit on the driver output allows the SP3481 and the SP3485 to withstand an infinite short circuit over the -7.0V to +12.0V common mode range without catastrophic damage to the IC. Receivers The SP3481 and SP3485 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 of the SP3481 and SP3485 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 receivers of the SP3481 and SP3485 operate up to 10Mbps. The receiver for each of the three devices is equipped with fail-safe. Fail-safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. Shutdown Mode for the SP3481 The SP3481 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 SP3481 into Shutdown mode. In Shutdown, supply current will drop to typical 1A, 10A maximum. 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2000 Sipex Corporation 4 VDM R S1 RL = 27 D VCC VOD R GENERATOR (NOTE 1) 50 D OUT CL = 15pF (NOTE 2) VOC VCC VOM = VOH + VOL 2 1.5V Figure 1. Driver DC Test Load Circuit Figure 2. Driver Propagation Delay Test Circuit S1 D OUT CL = 50pF (NOTE 2) GENERATOR (NOTE 1) 50 RL = 110 CL D GENERATOR (NOTE 1) 50 VCC RL = 60 OUT CL = 15pF (NOTE 2) VOM = VOH + VOL 2 1.5V Figure 3. Driver Differential Output Delay and Transition Time Circuit VCC RL = 110 S1 0V OR 3V D CL = 50pF (NOTE 2) GENERATOR (NOTE 1) 50 OUT Figure 4. Driver Enable and Disable Timing Circuit, Output HIGH VID GENERATOR (NOTE 1) R OUT CL = 15pF (NOTE 2) 50 1.5V 0V VOM = VCC 2 Figure 5. Driver Enable and Disable Timing Circuit, Output LOW Figure 6. Receiver Propagation Delay Test Circuit 1.5V -1.5V S3 1k VID R S1 VCC S2 CL = 15pF (NOTE 2) GENERATOR (NOTE 1) 50 Figure 7. Receiver Enable and Disable Timing Circuit INPUTS RE X X X DE 1 1 0 LINE DI CONDITION 1 No Fault 0 No Fault X X OUTPUTS B 0 1 Z A 1 0 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 (c) Copyright 2002 Sipex Corporation Table 1. Transmit Function Truth Table 10/15/02 Table 2. Receive Function Truth Table SP3481/3485 Low Power Half-Duplex RS485 Transceivers 5 3V INPUT 0V VOH Y OUTPUT VOL tPHL VOH Z OUTPUT VOL tTD tTD 1.5V tPLH VOM 1.5V tPHL VOM IN 1.5V 1.5V 3V 0V tDO1 tDO2 2.0V 90% 50% 10% -2.0V tPLH VOM VOM OUT 50% 10% 90% VOM = VOH + VOL 1.5V 2 Figure 8. Driver Propagation Delay Waveforms Figure 9. Driver Differential Output Delay and Transition Time Waveforms 3V DE 0V VOH OUTPUT HIGH 0V VCC OUTPUT LOW VOL VOM = VOH + VOL 1.5V 2 tPZL VOM tPLZ 0.25V tPZH VOM tPHZ 0.25V 1.5V 1.5V 3V INPUT 0V tRPLH VCC OUTPUT 0V VOM = VCC 2 VOM VOM tRPHL 1.5V 1.5V Figure 10. Driver Enable and Disable Timing Waveforms Figure 11. Receiver Propagation Delay Waveforms S1 is open S2 is closed S3 = 1.5V 3V RE 0V tPRHZ VOH OUTPUT 0V 10% 1.5V tPRZH tPRSH OUTPUT VOL 3V S1 is closed S2 is open S3 = -1.5V 1.5V 1.5V RE 0V 1.5V tPRLZ VCC 1.5V tPRZL tPRSL 1.5V 10% Figure 12. Receiver Enable and Disable Waveforms NOTE 1: The input pulse is supplied by a generator with the following characteristics: PRR=250KHz, 50% duty cycle, tr < 6.0ns, Z0=50. NOTE 2: CL includes probe and stray capacitance. 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2000 Sipex Corporation 6 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) 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 7 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) 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2000 Sipex Corporation 8 ORDERING INFORMATION Model Temperature Range Package SP3481CN .................................................................................... 0C to +70C ............................................................................ 8-pin Narrow SOIC SP3481CP .................................................................................... 0C to +70C ................................................................................ 8-pin Plastic DIP SP3481EN .................................................................................. .-40C to +85C .......................................................................... 8-pin Narrow SOIC SP3481EP ................................................................................... -40C to +85C .............................................................................. 8-pin Plastic DIP SP3485CN .................................................................................... 0C to +70C ............................................................................ 8-pin Narrow SOIC SP3485CP .................................................................................... 0C to +70C ................................................................................ 8-pin Plastic DIP SP3485EN ................................................................................... -40C to +85C .......................................................................... 8-pin Narrow SOIC SP3485EP ................................................................................... -40C to +85C .............................................................................. 8-pin Plastic DIP Please consult the factory for pricing and availability on a Tape-On-Reel option. Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com 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. 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 9 |
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