1

®

FN6363.1

ISL3150E, ISL3152E, ISL3153E,

ISL3155E, ISL3156E, ISL3158E

±16.5kV ESD (IEC61000-4-2) Protected,

Large Output Swing, 5V, Full Fail-Safe, 1/8

Unit Load, RS-485/RS-422 Transceivers

The ISL315xE are BiCMOS, IEC61000 ESD protected, 5V

powered, single transceivers that meet both the RS-485 and

RS-422 standards for balanced communication. Each driver

output and receiver input is protected against ±16.5kV ESD

strikes without latch-up.

The ISL315xE transmitters all deliver exceptional differential

output voltages (2.4V min), into the RS-485 required 54

Ω

load, for better noise immunity or to allow up to eight 120

Ω

terminations in “star” or other non-standard bus topologies.

so they present a true “1/8 unit load” to the RS-485 bus. This

allows up to 256 transceivers on the network without violating

the RS-485 specification’s 32 unit load maximum, and without

using repeaters.

Receiver (Rx) inputs feature a “Full Fail-Safe” design, which

ensures a logic high Rx output if Rx inputs are floating,

shorted, or on a terminated but undriven bus. Rx outputs

the design of optocoupled isolated interfaces).

The ISL3150E, ISL3152E, ISL3153E, ISL3155E utilize slew

rate limited drivers which reduce EMI, and minimize reflections

from improperly terminated transmission lines, or unterminated

stubs in multidrop and multipoint applications.

Hot Plug circuitry ensures that the Tx and Rx outputs remain

in a high impedance state until the power supply has

stabilized, and the Tx outputs are fully short circuit protected.

The ISL3150E, ISL3153E, ISL3156E are configured for full

duplex applications. The half duplex versions multiplex the

Rx inputs and Tx outputs to allow transceivers with output

disable functions in 8 Ld packages.

Features

Better Noise Immunity, or Drive Up to 8 Terminations

• IEC61000 ESD Protection on RS-485 I/O Pins . . ±16.5kV

- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM

• Tiny MSOP Packages Save 50% Board Space

• Full Fail-safe (Open, Short, Terminated and Undriven)

Receivers

Applications

• Hot Plug Circuitry - Tx and Rx Outputs Remain

Three-State During Power-up/Power-down

• True 1/8 Unit Load Allows up to 256 Devices on the Bus

• Specified for Single 5V, 10% Tolerance, Supplies

• High Data Rates . . . . . . . . . . . . . . . . . . . . . up to 20Mbps

Ultra Low Shutdown Supply Current . . . . . . . . . . . . 70nA

• -7V to +12V Common Mode Input Voltage Range

• Half and Full Duplex Pinouts

• Pb-free (RoHS compliant)

• Three-State Rx and Tx Outputs

• Current Limiting and Thermal Shutdown for Driver

Overload Protection

Applications

• Utility Meters and Automated Meter Reading Systems

• High Node Count Systems

• PROFIBUS® and Field Bus Networks, and Factory

Automation

• Security Camera Networks

• Building Lighting and Environmental Control Systems

• Industrial/Process Control Networks

TABLE 1. SUMMARY OF FEATURES

PART

NUMBER

HALF/FULL

DUPLEX

DATA RATE

(Mbps)

SLEW-RATE

LIMITED?

HOT PLUG

# DEVICES

ON BUS

Rx/Tx

ENABLE?

QUIESCENT

LOW POWER

SHUTDOWN?

PIN

COUNT

ISL3150E

Full

0.115

Yes

Yes

256

Yes

600

Yes

10, 14

ISL3152E

Half

0.115

Yes

Yes

256

Yes

600

Yes

8

ISL3153E

Full

1

Yes

Yes

256

Yes

600

Yes

10, 14

ISL3155E

Half

1

Yes

Yes

256

Yes

600

Yes

8

ISL3156E

Full

20

No

Yes

256

Yes

600

Yes

10, 14

ISL3158E

Half

20

No

Yes

256

Yes

600

Yes

8

Data Sheet

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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January 18, 2008