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ISO485 Datasheet

  • ISO485

  • Isolated RS-485 DIFFERENTIAL BUS TRANSCEIVER

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廬
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鈥檚 capacitively coupled isolation technol-
ogy to provide high-speed, low cost bus isolation.
The ISO485 is designed for bi-directional data com-
munication 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 in-
stead 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 RS-
485 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 load-
ing to the bus whenever the driver is disabled or
V
S
= 0V.
3
V
SA
15
V
SB
APPLICATIONS
q
MULTIPOINT DATA TRANSMISSION
ON LONG BUS LINES IN NOISY
ENVIRONMENTS
2
RE
A
B
12
13
1
R
24
D
TRUTH TABLE
RS-485
DE RE
BUS
0
23
DE
11
22
GND
A
GND
B
14
0
1
0
1
R
X
HIGH Z
HIGH Z
T
X
0
1
1
International Airport Industrial Park 鈥?Mailing Address: PO Box 11400
Tel: (520) 746-1111 鈥?Twx: 910-952-1111 鈥?Cable: BBRCORP 鈥?/div>
漏1994 Burr-Brown Corporation
鈥?Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd. 鈥?Tucson, AZ 85706
Telex: 066-6491 鈥?FAX: (520) 889-1510 鈥?Immediate Product Info: (800) 548-6132
PDS-1280C
Printed in U.S.A. May, 1995

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