® SP3483 +3.3V Low Power Slew Rate Limited Half-Duplex RS-485 Transceiver ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ RS-485 and RS-422 Transceiver Operates from a single +3.3V supply Interoperable with +5.0V logic Driver/Receiver Enable Low Power Shutdown Mode -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 Slew Rate Limited Driver for Low EMI (SP3483) DESCRIPTION The SP3483 device is part of a family of +3.3V low power half-duplex transceivers that meet the specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compatible with the Sipex SP483 device as well as popular industry standards. The SP3483 features Sipex's BiCMOS process, allowing low power operation without sacrificing performance. The SP3483 is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to 250kbps. RO 1 R 8 Vcc RE 2 7 B DE 3 6 A DI 4 D 5 GND SP3483 SP3483 DS/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 1 © Copyright 2000 Sipex Corporation 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.......................................................-65˚C to +150˚C Power Dissipation per package 8-pin NSOIC (derate 6.14mW/˚C above +70˚C).........................500mW 8-pin PDIP (derate 11.8mW/˚C above +70˚C)..........................1000mW SPECIFICATIONS TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted. PARAMETERS DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage MIN. TYP. MAX. UNITS GND 2 VCC VCC Volts Volts Unloaded; R = ∞; Figure 1 with load; R = 50Ω; (RS-422); Figure 1 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 Short-Circuit Current VOUT = HIGH VOUT = LOW DRIVER AC Characteristics Maximum Data Rate 250 VCC Volts with load; R = 27Ω; (RS-485); Figure 1 0.2 Volts R = 27Ω or R = 50Ω; Figure 1 3 0.8 ±10 Volts Volts Volts µA R = 27Ω or R = 50Ω; Figure 1 Applies to DE, DI, RE Applies to DE, DI, RE Applies to DE, DI, RE ±250 ±250 mA mA kbps CONDITIONS -7V ≤ VO ≤ +12V -7V ≤ VO ≤ +12V RE = VCC, DE = VCC Driver Input to Output, tPLH 400 900 1500 ns Figures 2 and 8 Driver Input to Output, tPHL 400 900 1500 ns Figures 2 and 8 10 700 700 690 80 90 1000 1300 1300 120 120 ns ns ns ns ns ns 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 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 SP3483 DS/04 +0.2 20 0.4 +1 15 1.0 -0.8 60 Volts mV Volts Volts µA kΩ 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 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 2 © Copyright 2000 Sipex Corporation SPECIFICATIONS (continued) TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted. PARAMETERS RECEIVER MIN. TYP. MAX. UNITS AC Characteristics Maximum Data Rate Receiver Input to Output, tPLH 250 35 70 120 kbps ns RE = 0V, DE = 0V Figures 6 and 11 Receiver Input to Output, tPHL 35 70 120 ns Figures 6 and 11 ns tRSKEW = tRPHL - tRPLH Figures 6 and 11 Differential Receiver Skew 50 Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Low Receiver Disable from High 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 No Load Shutdown Mode SP3483 DS/04 50 CONDITIONS 45 70 ns Figures 7 and 12; S1 closed, S2 open 45 45 45 70 70 70 ns ns ns Figures 7 and 12; S2 closed, S1 open Figures 7 and 12; S1 closed, S2 open Figures 7 and 12; S2 closed, S1 open 200 600 ns RE = 5V, DE = 0V 2000 ns Figures 4 and 10 2000 ns Figures 5 and 10 2500 ns Figures 7 and 12; S2 closed, S1 open 2500 ns Figures 7 and 12; S1 closed, S2 open 650 µA µA µA RE, DI = 0V or VCC; DE = VCC RE = 0V, DI = 0V or VCC; DE = 0V DE = 0V, RE=VCC 350 250 10 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 3 © Copyright 2000 Sipex Corporation PIN FUNCTION Pin 1 – RO – Receiver Output. R Pin 2 – RE – Receiver Output Enable Active LOW. 8 VCC RE 2 7 B DE 3 6 A Pin 5 – GND – Ground Connection. 5 GND Pin 6 – A – Driver Output/Receiver Input Non-inverting. RO 1 Pin 3 – DE – Driver Output Enable Active HIGH. Pin 4 – DI – Driver Input. D DI 4 SP485 Pin 7 – B – Driver Output/Receiver Input Inverting. Top View Pin 8 – Vcc – Positive Supply +3.00V < VCC < +3.60V SP3483 Pinout (Top View) DESCRIPTION Receivers The SP3483 device is part of a family of +3.3V low power half-duplex transceivers that meet the specifications of the RS-485 and RS-422 serial protocols. The device is pin-to-pin compatible with the Sipex SP483 device as well as popular industry standards. The SP3483 features Sipex's BiCMOS process allowing low power operation without sacrificing performance. The SP3483 receiver has differential inputs with an input sensitivity as low as ±200mV. Input impedance of the receivers is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receiver of the SP3483 has a high impedance (high-z) 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. Drivers The driver outputs of the SP3483 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 loading of 54Ω across the differential outputs, the drivers 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 force the driver outputs into high impedance (high-Z). The receiver of the SP3483 will operate up to 250kbps. The receiver is equipped with a fail-safe feature that guarantees the receiver output will be in a HIGH state when the input is left unconnected. Shutdown Mode The SP3483 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 SP3483 into Shutdown mode. In Shutdown, supply current will drop to typical 1µA, 10µA maximum. The SP3483 has internally slew rate limited driver outputs to minimize EMI. The tranceivers will operate up to 250kbps. The 250mA ISC maximum limit on the driver output allows the SP3483 to withstand an infinite short circuit over the -7.0V to +12.0V common mode range without catastrophic damage to the IC. SP3483 DS/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 4 © Copyright 2000 Sipex Corporation VDM R RL = 27Ω S1 VOD D D GENERATOR (NOTE 1) R VOC VCC OUT 50Ω CL = 15pF (NOTE 2) VCC VOM = VOH + VOL 2 Figure 1. Driver DC Test Load Circuit 1.5V Figure 2. Driver Propagation Delay Test Circuit S1 D CL RL = 60Ω D GENERATOR (NOTE 1) OUT OUT RL = 110Ω CL = 50pF (NOTE 2) GENERATOR (NOTE 1) 50Ω VCC 50Ω CL = 15pF (NOTE 2) VOM = VOH + VOL 2 1.5V Figure 4. Driver Enable and Disable Timing Circuit, Output HIGH Figure 3. Driver Differential Output Delay and Transition Time Circuit VCC RL = 110Ω VID S1 0V OR 3V D GENERATOR (NOTE 1) OUT R OUT 50Ω CL = 15pF (NOTE 2) CL = 50pF (NOTE 2) GENERATOR (NOTE 1) 50Ω 1.5V VOM = VCC 2 0V Figure 6. Receiver Propagation Delay Test Circuit Figure 5. Driver Enable and Disable Timing Circuit, Output LOW S1 S3 1.5V VCC 1k -1.5V VID R S2 CL = 15pF (NOTE 2) GENERATOR (NOTE 1) 50Ω Figure 7. Receiver Enable and Disable Timing Circuit INPUTS RE X X X DE 1 1 0 OUTPUTS LINE DI CONDITION 1 No Fault 0 No Fault X X B 0 1 Z INPUTS RE DE 0 0 0 0 0 0 1 0 A 1 0 Z Table 1. Transmit Function Truth Table SP3483 DS/04 OUTPUTS A-B R +0.2V 1 -0.2V 0 Inputs Open 1 X Z Table 2. Receive Function Truth Table SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 5 © Copyright 2000 Sipex Corporation 3V 1.5V 1.5V INPUT 3V 0V VOH tPLH IN tPHL 1.5V 1.5V 0V VOM VOM Y OUTPUT tDO1 tDO2 VOL tPHL tPLH VOH Z OUTPUT OUT VOM VOM 2.0V 90% 90% 50% 10% 50% 10% -2.0V VOL tTD tTD VOM = VOH + VOL ≈ 1.5V 2 Figure 8. Driver Propagation Delay Waveforms Figure 9. Driver Differential Output Delay and Transition Time Waveforms 3V 1.5V 1.5V DE 0V VOH OUTPUT HIGH 3V tPHZ tPZH INPUT 0.25V VOM 0V VCC OUTPUT LOW 1.5V 1.5V tRPLH tRPHL 0V VCC tPZL OUTPUT tPLZ VOM VOL VOM VOM 0V VOM = VCC 2 0.25V VOM = VOH + VOL ≈ 1.5V 2 Figure 10. Driver Enable and Disable Timing Waveforms Figure 11. Receiver Propagation Delay Waveforms S1 is open S2 is closed S3 = 1.5V S1 is closed S2 is open S3 = -1.5V 3V 3V 1.5V 1.5V RE 0V 0V tPRHZ VOH OUTPUT 1.5V 1.5V RE tPRZH tPRSH tPRLZ tPRZL tPRSL VCC 10% 1.5V OUTPUT 1.5V VOL 0V 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=50Ω. NOTE 2: CL includes probe and stray capacitance. SP3483 DS/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 6 © 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 B1 B e = 0.100 BSC (2.540 BSC) Ø L eA = 0.300 BSC (7.620 BSC) ALTERNATE END PINS (BOTH ENDS) DIMENSIONS (Inches) Minimum/Maximum (mm) 8–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 0.355/0.400 (9.017/10.160) 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°) SP3483 DS/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 7 © Copyright 2000 Sipex Corporation PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (NARROW) E H h x 45° D A Ø e B DIMENSIONS (Inches) Minimum/Maximum (mm) SP3483 DS/04 A1 L 8–PIN A 0.053/0.069 (1.346/1.748) A1 0.004/0.010 (0.102/0.249 B 0.014/0.019 (0.35/0.49) D 0.189/0.197 (4.80/5.00) E 0.150/0.157 (3.802/3.988) e 0.050 BSC (1.270 BSC) H 0.228/0.244 (5.801/6.198) h 0.010/0.020 (0.254/0.498) L 0.016/0.050 (0.406/1.270) Ø 0°/8° (0°/8°) SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 8 © Copyright 2000 Sipex Corporation ORDERING INFORMATION Model Temperature Range Package SP3483CN .................................................................................... 0˚C to +70˚C ............................................................................ 8-pin Narrow SOIC SP3483CP .................................................................................... 0˚C to +70˚C ................................................................................ 8-pin Plastic DIP SP3483EN .................................................................................. .-40˚C to +85˚C .......................................................................... 8-pin Narrow SOIC SP3483EP ................................................................................... -40˚C to +85˚C .............................................................................. 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 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. SP3483 DS/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers 9 © Copyright 2000 Sipex Corporation