DATASHEET
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
3.3V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
FN6052
Rev.5.00
Nov 21, 2018
These Renesas RS-485/RS-422 devices are BiCMOS 3.3V
powered, single transceivers that meet both the RS-485 and
Features
• Operate from a single +3.3V supply (10% tolerance)
• Interoperable with 5V logic
RS-422 standards for balanced communication. Unlike
competitive devices, this Renesas family is specified for 10%
tolerance supplies (3V to 3.6V).
• High data rates. . . . . . . . . . . . . . . . . . . . . . up to 10Mbps
• Single unit load allows up to 32 devices on the bus
The ISL83483 and ISL83488 use slew rate limited drivers
which reduce EMI, and minimize reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications.
• Slew rate limited versions for error free data transmission
(ISL83483, ISL83488) . . . . . . . . . . . . . . . . .up to 250kbps
• Low current Shutdown mode (ISL83483, ISL83485,
ISL83491). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15nA
Data rates up to 10Mbps are achievable by using the
ISL83485, ISL83490, or ISL83491, which feature higher
slew rates.
• -7V to +12V common-mode input voltage range
• Three-state Rx and Tx outputs (except ISL83488,
ISL83490)
Logic inputs (for example, DI and DE) accept signals in
excess of 5.5V, making them compatible with 5V logic
families.
• 10ns propagation delay, 1ns skew (ISL83485, ISL83490,
ISL83491)
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high output if Rx inputs are floating. All
devices present a “single unit load” to the RS-485 bus, which
allows up to 32 transceivers on the network.
• Full duplex and half duplex pinouts
• Current limiting and thermal shutdown for driver overload
protection
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.
• Pb-free (RoHS compliant)
Applications
• Factory automation
The ISL83488, ISL83490, and ISL83491 are configured for
full duplex (separate Rx input and Tx output pins)
applications. The ISL83488 and ISL83490 are offered in
space saving 8 Ld packages for applications not requiring Rx
and Tx output disable functions (for example, point-to-point
and RS-422). Half duplex configurations (ISL83483,
ISL83485) multiplex the Rx inputs and Tx outputs to provide
transceivers with Rx and Tx disable functions in 8 Ld
packages.
• Security networks
• Building environmental control systems
• Industrial/process control networks
• Level translators (for example, RS-232 to RS-422)
• RS-232 “Extension Cords”
Related Literature
For a full list of related documents, visit our website:
• ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
device pages
TABLE 1. SUMMARY OF FEATURES
SLEW-RATE RECEIVER/DRIVER QUIESCENT I
PART
NUMBER
HALF/FULL
DUPLEX
DATA RATE
(Mbps)
LOW POWER
SHUTDOWN?
CC
LIMITED?
ENABLE?
(mA)
0.65
0.65
0.65
0.65
0.65
PIN COUNT
ISL83483
ISL83485
ISL83488
ISL83490
ISL83491
Half
Half
Full
Full
Full
0.25
10
Yes
No
Yes
Yes
Yes
No
8
8
Yes
0.25
10
Yes
No
No
8
No
No
8
10
No
Yes
Yes
14
FN6052 Rev.5.00
Nov 21, 2018
Page 1 of 19
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