DATASHEET
ISL3332, ISL3333
3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485)
Transceivers
FN6362
Rev 1.00
Jan 21, 2021
The ISL3332, ISL3333 are two port interface ICs where each
port can be independently configured as a single
Features
• 15kV (HBM) ESD Protected Bus Pins (RS-232 or
RS-485)
RS-485/422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232
transceiver. With both ports set to the same mode, two
RS-485/RS-422 transceivers, or four RS-232 transceivers
are available.
• Operates From a Single 3.3V Supply
• Two Independent Ports, Each User Selectable for RS-232
(2 Transceivers) or RS-485/RS-422 (1 Transceiver)
If either port is in RS-232 mode, the onboard charge pump
generates RS-232 compliant 5V Tx output levels from a
• True Flow-Through Pinouts Simplify Board Layouts
• Pb-free (RoHS compliant)
single V
supply as low as 3.15V. The transceivers are
CC
RS-232 compliant, with the Rx inputs handling up to 25V.
• Full Failsafe (Open/Short) Rx in RS-485/422 Mode
• Loopback Mode Facilitates Board Self Test Functions
In RS-485 mode, the transceivers support both the RS-485
and RS-422 differential communication standards. The
receivers feature “full fail-safe” operation, so the Rx outputs
remain in a high state if the inputs are open or shorted
together. The transmitters support up to three data rates, two
of which are slew rate limited for problem free
communications. The charge pump disables when both
ports are in RS-485 mode, thereby saving power, minimizing
noise, and eliminating the charge pump capacitors.
• User Selectable RS-485 Data Rates (ISL3333 Only)
- Fast Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 115kbps
• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 400kbps
• RS-232 Tx and Rx Enable Pins (ISL3333 Only)
Both RS-232 and RS-485 modes feature loopback and
shutdown functions. Loopback internally connects the Tx
outputs to the corresponding Rx input, to facilitate board
level self test implementation. The outputs remain connected
to the loads during loopback, so connection problems (e.g.,
shorted connectors or cables) can be detected. Shutdown
mode disables the Tx and Rx outputs, disables the charge
pumps, and places the IC in a low current (35µA) mode.
• Small Charge Pump Caps . . . . . . . . . . . . . . . . . 4 x 0.1µF
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .35µA
• QFN Package Saves Board Space (ISL3333 Only)
• Logic Supply Pin (V ) Eases Operation in Mixed Supply
L
Systems (ISL3333 Only)
Applications
The ISL3333 is a QFN packaged device that includes two
additional user selectable, lower speed and edge rate
options for EMI sensitive designs, or to allow longer bus
• Gaming Applications (such as Slot Machines)
• Single Board Computers
• Factory Automation
lengths. It also features a logic supply pin (V ) that sets the
L
V
level of logic outputs, and the switching points of logic
OH
• Security Networks
inputs, to be compatible with another supply voltage in mixed
voltage systems. The QFN also adds RS-232 mode Tx EN
pins (DEN), and active low Rx enable pins (RXEN) to
increase design flexibility. In RS-485 applications, active low
Rx enable pins allow Tx/Rx direction control, via a single
signal per port, by connecting the corresponding DE and
RXEN pins together.
• Industrial/Process Control Networks
• Level Translators (such as RS-232 to RS-422)
• Point of Sale Equipment
• Dual Channel RS-485 Interfaces
For a single port version of these devices, please see the
ISL3330, ISL3331 data sheet.
TABLE 1. SUMMARY OF FEATURES
NO. OF
PORTS
RS-485 DATA RS-232 DATA
RS-232 Tx ACTIVE H or L LOW POWER
PART NUMBER
PACKAGE OPTIONS
V PIN?
L
RATE (bps)
RATE (kbps)
ENABLE?
Rx ENABLE? SHUTDOWN?
ISL3332
ISL3333
2
2
28 Ld SSOP
20M
400
400
NO
NO
NONE
L
YES
YES
40 Ld QFN (6 x 6mm) 20M, 460k, 115k
YES
YES
FN6362 Rev 1.00
Jan 21, 2021
Page 1 of 27
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