ISL33354E Datasheet, PDF (1/23 Pages) Intersil Corporation – Full fail-safe (open/short) RS-485/422 port 2 Rx

DATASHEET
5V, ±15kV ESD Protected, Two Port, Dual Protocol
(RS-232/RS-485) Transceivers
ISL33354E, ISL33357E
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.
An on-board charge pump generates RS-232 compliant ±5V Tx
output levels from a single V_CC supply as low as 4.5V. The
transceivers are RS-232 compliant, with the Rx inputs
handling up to ±25V.
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.
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.
The ISL33357E is a QFN packaged device for space
constrained applications.
Related Literature
• For a full list of related documents, visit our website
- ISL33354E, ISL33357E product pages
Features
• ±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)
• True flow-through pinouts (Rx inputs and Tx outputs all on
the same side) simplify board layouts
• Pb-free (RoHS compliant)
• 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)
Applications
• Gaming applications (e.g., slot machines)
• Single board computers
• Factory automation
• Security networks
• Industrial/process control networks
• Level translators (e.g., RS-232 to RS-422)
• Point-of-sale equipment
PART NUMBER
ISL33354E
ISL33357E
PACKAGE OPTION
28 Ld SSOP
40 Ld QFN (6 x 6mm)
TABLE 1. SUMMARY OF FEATURES
PORT 2
RS-485 DATA RATE
PORT 1
RS-232 DATA RATE
20M, 115k
650k
20M, 115k
650k
LOW POWER
SHUTDOWN?
YES
YES
PORT 2
RS-485 Rx AND Tx
YES
YES
October 21, 2016
1
FN8775.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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