ISO15
ISO35
www.ti.com................................................................................................................................................................ SLOS580B–MAY 2008–REVISED JULY 2008
ISOLATED 3.3-V FULL AND HALF-DUPLEX RS-485 TRANSCEIVERS
1
FEATURES
APPLICATIONS
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Security Systems
Chemical Production
Factory Automation
Motor/motion Control
HVAC and Building Automation Networks
Networked Security Stations
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4000-VPEAK Isolation, 560-Vpeak VIORM
UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2)
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1/8 Unit Load – Up to 256 Nodes on a Bus
Meets or Exceeds TIA/EIA RS-485
Requirements
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Signaling Rates up to 1 Mbps
Thermal Shutdown Protection
Low Bus Capacitance – 16 pF (Typ)
50 kV/µs Typical Transient Immunity
Fail-safe Receiver for Bus Open, Short, Idle
3.3-V Inputs are 5-V Tolerant
DESCRIPTION
The ISO15 is an isolated half-duplex differential line transceiver while the ISO35 is an isolated full-duplex
differential line driver and receiver for TIA/EIA 485/422 applications.
These devices are ideal for long transmission lines since the ground loop is broken to allow for a much larger
common-mode voltage range. The symmetrical isolation barrier of the device is tested to provide 2500 Vrms of
isolation for 60s between the bus-line transceiver and the logic-level interface.
Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can
cause damage to the transceiver and/or near-by sensitive circuitry if they are of sufficient magnitude and
duration. These isolated devices can significantly increase protection and reduce the risk of damage to
expensive control circuits.
The ISO15 and ISO35 are qualified for use from –40°C to 85°C.
DW PACKAGE
function diagram
1
2
3
4
5
6
7
8
Vcc2
GND2
A
Vcc1
GND1
R
16
15
14
13
12
11
10
9
14
13
A
B
3
4
R
RE
DE
RE
B
5
DE
Z
D
Y
12
11
Z
Y
GND2
GND2
GND1
GND1
6
D
DW PACKAGE
function diagram
1
2
3
4
5
6
7
8
Vcc2
GND2
nc
Vcc1
GND1
R
16
15
14
13
12
11
10
9
5
DE
6
RE
B
D
13
12
DE
A
B
A
3
4
D
R
nc
GND2
GND2
GND1
GND1
RE
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated