SP3483_04 SIPEX | Alldatasheet
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Date: 6/23/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation SP3483 ■ 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) 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. +3.3V Low Power Slew Rate Limited Half-Duplex RS-485 Transceiver
DESCRIPTION
00 +0.2V 1 00 -0.2V 0
00 Inputs Open 1
10 X Z
Table 1. Transmit Function Truth Table Table 2. Receive Function Truth Table
8 Pin nSOIC
Date: 6/23/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS DRIVER DC Characteristics Differential Output Voltage GND V CC Volts Unloaded; R = ∞; Figure 1 Differential Output Voltage 2 V CC Volts with load; R = 50 Ω; (RS-422); Figure 1 Differential Output Voltage 1.5 V CC Volts with load; R = 27Ω; (RS-485); Figure 1 Change in Magnitude of Driver Differential Output Voltage for Complimentary States 0.2 Volts R = 27 Ω or R = 50Ω; Figure 1 Driver Common-Mode Output Voltage 3 Volts R = 27 Ω or R = 50Ω; Figure 1 Input High Voltage 2.0 Volts Applies to DE, DI, RE Input Low Voltage 0.8 Volts Applies to DE, DI, RE Input Current ±10 µA Applies to DE, DI, RE Driver Short-Circuit Current V OUT = HIGH ±250 mA -7V ≤ VO ≤ +12V VOUT = LOW ±250 mA -7V ≤ VO ≤ +12V DRIVER AC Characteristics Maximum Data Rate 250 kbps RE = V CC, 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 Differential Driver Skew 10 ns t DO1 - tDO2 Figures 2 and 9 Driver Rise or Fall Time 700 1000 ns From 10% to 90% Figures 3 and 9 Driver Enable to Output High 700 1300 ns Figures 4 and 10 Driver Enable to Output Low 690 1300 ns Figures 5 and 10 Driver Disable Time from Low 80 120 ns Figures 5 and 10 Driver Disable Time from High 90 120 ns Figures 4 and 10 RECEIVER DC Characteristics Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ +12V Input Hysteresis 20 mV V CM = 0V Output Voltage High V CC-0.4 Volts V ID = +200mV, -1.5mA Output Voltage Low 0.4 Volts V ID = -200mV, 2.5mA Three-State (High Impedance) Output Current +1 µA 0V ≤ VO ≤ VCC; RE = VCC Input Resistance 12 15 k Ω -7V ≤ VCM ≤ +12V Input Current (A, B); VIN = 12V 1.0 mA DE = 0V, V CC = 0V or 3.6V, VIN = 12V Input Current (A, B); VIN = -7V -0.8 mA DE = 0V, V CC = 0V or 3.6V, VIN = -7V Short-Circuit Current 7 60 mA 0V ≤ VCM ≤ VCC 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. V Input Voltages Output Voltages Power Dissipation per package
ELECTRICAL CHARACTERISTICS
Date: 6/23/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS RECEIVER AC Characteristics Maximum Data Rate 250 kbps RE = 0V, DE = 0V Receiver Input to Output, t PLH 35 70 120 ns Figures 6 and 11 Receiver Input to Output, tPHL 35 70 120 ns Figures 6 and 11 Differential Receiver Skew 50 ns t RSKEW = tRPHL - tRPLH Figures 6 and 11 Receiver Enable to Output Low 45 70 ns Figures 7 and 12; S1 closed, S2 open Receiver Enable to Output High 45 70 ns Figures 7 and 12; S2 closed, S1 open Receiver Disable from Low 45 70 ns Figures 7 and 12; S1 closed, S2 open Receiver Disable from High 45 70 ns Figures 7 and 12; S2 closed, S1 open Shutdown Timing Time to Shutdown 50 200 600 ns RE = 5V, DE = 0V Driver Enable from Shutdown to Output High 2000 ns Figures 4 and 10 Driver Enable from Shutdown to Output Low 2000 ns Figures 5 and 10 Receiver Enable from Shutdown to Output High 2500 ns Figures 7 and 12; S2 closed, S1 open Receiver Enable from Shutdown to Output Low 2500 ns Figures 7 and 12; S1 closed, S2 open POWER REQUIREMENTS Supply Current No Load 350 650 µA RE, DI = 0V or VCC; DE = VCC 250 µA RE = 0V, DI = 0V or VCC; DE = 0V Shutdown Mode 10 µA DE = 0V, RE=VCC
Date: 6/23/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation PIN FUNCTION Pin 1 – RO – Receiver Output. Pin 2 – RE – Receiver Output Enable Active LOW. Pin 3 – DE – Driver Output Enable Active HIGH. Pin 4 – DI – Driver Input. Pin 5 – GND – Ground Connection. Pin 6 – A – Driver Output/Receiver Input Non-inverting. Pin 7 – B – Driver Output/Receiver Input Inverting. Pin 8 – Vcc – Positive Supply +3.00V < V CC < +3.60V 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. 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 SP3483 has internally slew rate limited driver outputs to minimize EMI. The tranceivers will operate up to 250kbps. The 250mA I SC 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 Pinout (Top View) RO 1 RE 2 DE 3 DI 4 8 V CC 7 B 6 A
5 GND
D R SP485 Top View Receivers 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. 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.
Date: 6/23/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation INDEX AREA b N 1 23 N/2 c - - .210 .015 - Dimensions in inches8 PIN PDIP JEDEC MS-001 (BA) Variation .115 .130 .195 .014 .018 .022 .045 .060 .070 .240 .250 .280 A b c E e eA eB .115 .130 .150L MIN NOM MAX b3 .030 .039 .045 D .008 .010 .014 .355 .365 .400 .005 .300 .310 .325 .100 BSC .300 BSC .430 - - eA eB E c
8 PIN PDIP
D A L b e PACKAGE: 8 PIN PDIP
Date: 6/23/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation SEE VIEW C Ø 1.65 DIMENSIONS Minimum/Maximum (mm) (JEDEC MS-012, AA - VARIATION) COMMON HEIGHT DIMENSION A b c L e E 1.35
4.90 BSC
0.40 0.31 0.51 SYMBOL MIN NOM MAX 0.10 - 0.25 D 1.75 1.25 0.17 0.25
6.00 BSC
3.90 BSC
1.27 BSC
1.27
1.04 REF
0.25 BSC
15º A A2 SEATING PLANE SIDE VIEW L ØØ1 Seating Plane Gauge Plane VIEW C TOP VIEW e E E/2 A INDEX AREA (D/2 X E1/2) E1/2 D b
8 PIN NSOICPACKAGE:
c WITH PLATING BASE METAL b CONTACT AREA PACKAGE: 8 PIN NSOIC
Date: 6/23/04 SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation Part Number Temperature Range Package Corporation ANALOG EXCELLENCE Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability aris ing 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. Sipex Corporation Headquarters and Sales Office
233 South Hillview Drive
Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
ORDERING INFORMATION
Available in lead free packaging. To order add "-L" suffix to part number. Example: SP3483EN/TR = standard; SP3483EN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,500 for NSOIC.