DATASHEET
5V, ±15kV ESD Protected, Two Port, Dual Protocol
(RS-232/RS-485) Transceivers
ISL33354E, ISL33357E
Features
The ISL33354E, ISL33357E are two port interface ICs where
port 1 is configured as a dual (2 Tx, 2 Rx) RS-232 transceiver,
and port 2 is a single RS-485/422 transceiver.
• ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
• Operates from a single 5V supply
• Two independent ports: port 1 set for RS-232 (2 transceivers)
and port 2 for RS-485/RS-422 (1 transceiver)
An on-board charge pump generates RS-232 compliant ±5V Tx
output levels from a single V supply as low as 4.5V. The
CC
• True flow-through pinouts (Rx inputs and Tx outputs all on
the same side) simplify board layouts
transceivers are RS-232 compliant, with the Rx inputs
handling up to ±25V.
• Pb-free (RoHS compliant)
The port 2 transceiver supports both the RS-485 and RS-422
differential communication standards. The receiver features
"full fail-safe" operation, so the Rx output remains in a high
state if the inputs are open or shorted together. The
transmitter supports two data rates, one of which is slew rate
limited for problem free communication at low data rates. The
active low Rx enable pin (RE485) allows Tx/Rx direction
control, via a single signal, simply by connecting the
corresponding DE485 and RE485 pins together.
• Full fail-safe (open/short) RS-485/422 port 2 Rx
• User selectable RS-485 data rates
- Fast speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps
- Slew rate limited . . . . . . . . . . . . . . . . . . . . . . up to 115kbps
• Fast RS-232 data rate . . . . . . . . . . . . . . 460kbps (Minimum)
• Small charge pump capacitors . . . . . . . . . . . . . . . . 4 x 0.1µF
• Low current shutdown mode . . . . . . . . . . . . . . . . . . . . . . 55µA
• QFN package saves board space (ISL33357E only)
The ISL33354E and ISL33357E also include a shutdown
function, which disables the Tx and Rx outputs, disables the
charge pumps and places the IC in a low current (55µA) mode.
Applications
• Gaming applications (e.g., slot machines)
The ISL33357E is a QFN packaged device for space
constrained applications.
• Single board computers
Related Literature
• For a full list of related documents, visit our website
- ISL33354E, ISL33357E product pages
• Factory automation
• Security networks
• Industrial/process control networks
• Level translators (e.g., RS-232 to RS-422)
• Point-of-sale equipment
TABLE 1. SUMMARY OF FEATURES
PORT 2
RS-485 DATA RATE
PORT 1
RS-232 DATA RATE
PORT 2
RS-485 Rx AND Tx
LOW POWER
SHUTDOWN?
PART NUMBER
ISL33354E
PACKAGE OPTION
28 Ld SSOP
20M, 115k
20M, 115k
650k
650k
YES
YES
YES
YES
ISL33357E
40 Ld QFN (6 x 6mm)
October 21, 2016
FN8775.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC. 2015, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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