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ISL81485
Data Sheet
July 2004
FN6061.1
5V, 30Mbps, RS-485/RS-422 Transceiver
The Intersil ISL81485 is a BiCMOS, 5V powered, single
transceiver that meets both the RS-485 and RS-422
standards for balanced communication, and features a larger
output voltage and higher data rate to benefit high speed
applications.
Unlike competitive devices, this Intersil transceiver is
specified for 10% tolerance supplies (4.5V to 5.5V), and it
delivers a much larger worst case differential output voltage
(2.0V compared to the typical 1.5V) over the full supply
range. The increased output voltage translates into longer
reach, or better data integrity, at the 30Mbps data rate.
This device presents a 鈥? unit load鈥?to the RS-485 bus, which
allows up to 32 transceivers on the network.
Receiver (Rx) inputs feature a 鈥渇ail-safe if open鈥?design,
which ensures a logic high Rx output if Rx inputs are
floating.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
Features
鈥?Specified for 10% Tolerance Supplies
鈥?High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 30Mbps
鈥?Large Differential Output Voltage . . . . 2.0V(min.) into 54鈩?/div>
鈥?Drop-In Replacement for the ADM1485
鈥?One Unit Load Allows up to 32 Devices on the Bus
鈥?Low Quiescent Current . . . . . . . . . . . . . . . . . . . . . 800
碌
A
鈥?-7V to +12V Common Mode Input Voltage Range
鈥?Three State Rx and Tx Outputs
鈥?15ns (Max) Propagation Delays, 5ns (Max) Skew
鈥?Operates from a Single +5V Supply (10% Tolerance)
鈥?Current Limiting and Thermal Shutdown for driver
Overload Protection
鈥?/div>
Pb-free available
Applications
鈥?SCSI 鈥淔ast 20鈥?Drivers and Receivers
鈥?Factory Automation
鈥?Field Bus Networks
Ordering Information
PART NO.
(BRAND)
ISL81485IB
(81485IB)
ISL81485IBZ
(81485IB) (See Note)
ISL81485IU (1485)
ISL81485IUZ (1485)
(See Note)
TEMP.
RANGE (
o
C)
-40 to 85
-40 to 85
-40 to 85
-40 to 85
PACKAGE
8 Ld SOIC
8 Ld SOIC
(Pb-free)
8 Ld MSOP
8 Ld MSOP
(Pb-free)
PKG.
DWG. #
M8.15
M8.15
M8.118
M8.118
鈥?Security Networks
鈥?Building Environmental Control Systems
鈥?Industrial/Process Control Networks
Pinout
ISL81485 (SOIC, MSOP)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
D
8
7
6
5
V
CC
B/Z
A/Y
GND
*Add 鈥?T鈥?suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
R
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2003, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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