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Part: ISO485P
Category:
Interface and Interconnect
-> RS-485
Description: ti ISO485, ISOlated RS-485 Transceiver
Company: Texas Instruments, Inc.
Datasheet: Download ISO485P datasheet File size : 1158 kB
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Datasheet text preview:
ISO
485
ISO485
Isolated RS-485 DIFFERENTIAL BUS TRANSCEIVER
FEATURES
q RS-485 AND RS-422 COMPATIBLE q 100% TESTED FOR HIGH-VOLTAGE BREAKDOWN q q q q RATED 1500Vrms SINGLE-WIDE 24-PIN PLASTIC DIP EASY TO USE LOW POWER: 180mW typ at 5Mbit/s
DESCRIPTION
The ISO485 differential, isolated bus transceiver uses Burr-Brown's capacitively coupled isolation technology to provide high-speed, low cost bus isolation. The ISO485 is designed for bi-directional data communication on multipoint bus transmission lines and meets EIA Standard RS-485 as well as EIA Standard RS-422A requirements. The ISO485 uses high voltage 0.4pF capacitors instead of the LED and photodetector which are used in equivalent optocoupler solutions. As a consequence the part count of the isolated RS-485 channel is reduced from multiple optocoupler channels, an RS485 transceiver chip and supporting circuitry to one ISO485. The capacitors in the ISO485 provide a high voltage barrier, 1500Vrms and greatly reduce current spikes on the power line. The ISO485 combines a 3-state differential line driver and a differential-input line receiver both of which operate from a single 5V power supply. The driver differential outputs and the receiver differential input/ output bus ports are designed to offer minimum loading to the bus whenever the driver is disabled or VS = 0V.
15 VSB
APPLICATIONS
q MULTIPOINT DATA TRANSMISSION ON LONG BUS LINES IN NOISY ENVIRONMENTS
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3 RE VSA
2
1
R
A B
12 13
24
D
TRUTH TABLE RS-485 DE RE BUS 0
23 DE 11 22 GA D N GB D N 14
0 1 0 1
RX HIGH Z HIGH Z TX
0 1 1
International Airport Industrial Park · Mailing Address: PO Box 11400 Tel: (520) 746-1111 · Twx: 910-952-1111 · Cable: BBRCORP · ©1994 Burr-Brown Corporation
· Tucson, AZ 85734 · Street Address: 6730 S. Tucson Blvd. · Tucson, AZ 85706 Telex: 066-6491 · FAX: (520) 889-1510 · Immediate Product Info: (800) 548-6132 PDS-1280C Printed in U.S.A. May, 1995
SBOS049
SPECIFICATIONS
At TA = +25°C, VS = 5V, unless otherwise specified. ISO485P PARAMETER DRIVER DC CHARACTERISTICS Input Voltage High MIN Low MAX Input Current High-Level Low-Level Output Voltage Differential Output Voltage CONDITION MIN TYP MAX UNITS
2 0.8 VIN = 2.4V VIN = 0.4V IOUT = 0 IOA IOB = 0 RLOAD = 100 RLOAD = 54 ±1 ±1 5 5 2.5 2.5 5 5 ±0.5 3 ±0.2 1 0.8 250 150 250 250
V V µA µA V V V V V V V mA mA mA mA mA mA
0 1.5 2 1.5
Change In Magnitude of Differential Output Voltage Common-Mode Output Voltage Change in Magnitude of Common-Mode Output Voltage Output Current Short-Circuit Output Current (1 sec max)
RLOAD = 54 or 100 RLOAD = 54 or 100 RLOAD = 54 or 100 VOUT = 7V, output disabled VOUT = 7V, output disabled VOUT = 7V VOUT = 0V VOUT = VS VOUT = 12V
DRIVER SWITCHING CHARACTERISTICS Propagation Delay Time, Low-to-High Level Output Propagation Delay Time, High-to-Low Level Output Input to Output Propagation Delay Skew Output Rise Time Output Fall Time RECEIVER DC CHARACTERISTICS Differential-Input-Threshold Voltage High Low Hysteresis High-Level Output Voltage Low-Level Output Voltage High-Impedance-State Output Current Line Input Current Enable-Input Current High Low Input Resistance Short-Circuit Output Current RECEIVER SWITCHING CHARACTERISTICS Propagation Delay Time, Low-to-High Level Output High-to-Low Level Output Input to Output Propagation Delay Skew Output Rise Time Output Fall Time TRANSCEIVER SPECIFICATIONS Maximum Data Rate Propagation Delay Driver to Receiver Driver Output Enable Time Driver Output Disable Time Propagation Delay Receiver to Driver Receiver Output Enable Time Receiver Output Disable Time
RLOAD = 54 RLOAD = RLOAD = RLOAD = RLOAD = 54 54 54 54
60 60 10 10 10
ns ns ns ns ns
VOUT = 2.7V, IOUT = 0.4mA VOUT = 0.5V, IOUT = 8mA VID = 200mV, IOH = 400µA VID = 200mV, IOL = 8mA VOUT = 1.4V VIN = 12V, other output = 0V VIN = 7V, other output = 0V VIH = 2.7V VIL = 0.4V
0.2 0.2 70 2.4 0.4 ±1 0.7 0.6 1 1 12 40
V V mV V V µA mA mA µA µA k mA
1 sec max
VID = 1.5V to 1.5V, CL = 15pF VID = 1.5V to 1.5V, CL = 15pF RL = 54 RL = 54 20 RL = 110 RL = 110 CL = 15pF CL = 15pF
35 30 10 8 8 35 75 155 185 13 110 120
60 60
ns ns ns ns ns Mbits/s ns ns ns ns ns ns
200 280 180 185
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ISO485
2
SPECIFICATIONS (CONT)
At TA = +25°C, VS = 5V, unless otherwise specified. ISO485P PARAMETER TRANSCEIVER SPECIFICATIONS (CONT) Supply Voltage VSA VSB Supply Current VSA VSA VSA VSA VSB VSB VSB VSB RECOMMENDED OPERATING CONDITIONS Voltage at Any Bus Terminal High-Level Driver Input Voltage Low-Level Driver Input Voltage Differential Receiver Input Voltage Output Current High-Level CONDITION MIN TYP MAX UNITS
3 4.75 DE RE 0 0 0 1 1 0 1 1 0 0 0 1 1 0 1 1 RS-485 BUS Rx HIGH Z HIGH Z Tx Rx HIGH Z HIGH Z Tx
5 5
5.5 5.25 5 0.4 0.4 0.4 55 55 51 51
V V mA mA mA mA mA mA mA mA
(separately or common-mode)
7 2
12 0.8 ±12
V V V V mA µA mA mA °C °C Vrms Vrms mm mm kV/µs || pF µArms
Driver Receiver Output Current Low-Level Driver Receiver TEMPERATURE RANGE Operating Storage ISOLATION PARAMETERS Rated Voltage, Continuous Partial Discharge, 100% Test(1) Creepage Distance (External) DIP = "P" Package Internal Isolation Distance Isolation Voltage Transient Immunity(2) Barrier Impedance Leakage Current 50Hz 1s, 5pC 40 40 1500 2400 16 0.10 1.6 > 1014 || 7 0.6
60 400 60 8 85 125
240Vrms, 60Hz
NOTES: (1) All devices receive a 1s test. Failure criterion is 5 pulses of 5pC. (2) The voltage rate-of-change across the isolation barrier that can be sustained without data errors.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
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3
ISO485
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