1

DATASHEET

±16.5kV ESD Protected, +125°C, 3.0V to 5.5V,

SOT-23/TDFN Packaged, 20Mbps, Full Fail-safe, Low

Power, RS-485/RS-422 Receivers

ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E

The Intersil ISL3280E, ISL3281E, ISL3282E, ISL3283E,

ISL3284E, ISL3285E are ±16.5kV IEC61000 ESD Protected,

3.0V to 5.5V powered, single receivers that meet both the

RS-485 and RS-422 standards for balanced communication.

These receivers have very low bus currents (+125µA/-100µA),

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

allows up to 256 receivers on the network without violating the

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

repeaters.

Receiver inputs feature a “Full Fail-Safe” design, which ensures

a logic high Rx output if Rx inputs are floating, shorted, or

terminated but undriven.

The ISL3280E and ISL3284E feature an always enabled Rx;

the ISL3281E and ISL3285E feature an active high Rx enable

pin and the ISL3282E and ISL3283E include an active low

enable pin. All versions are offered in Industrial and Extended

Industrial (-40°C to +125°C) temperature ranges.

A 26% smaller footprint is available with the ISL3282E and

ISL3285E TDFN package. These devices, plus the ISL3284E,

the RO output (and the switching points of the RE/RE input) to

be compatible with another supply voltage in mixed voltage

systems.

For companion single RS-485 transmitters in micro packages,

please see the ISL3293E datasheet.

Features

- Class 3 ESD level on all other pins. . . . . . . . . . . .>5kV HBM

• Pb-free (RoHS compliant)

• Wide supply range . . . . . . . . . . . . . . . . . . . . . . . . . 3.0V to 5.5V

• Specified for +125°C operation

systems (ISL3282E, ISL3284E, ISL3285E only)

• Full fail-safe (open, short, terminated/undriven)

• True 1/8 unit load allows up to 256 devices on the bus

• High data rates. . . . . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps

• Low quiescent supply current. . . . . . . . . . . . . . . 500µA (max)

- Very low shutdown supply current . . . . . . . . . . 20µA (max)

• -7V to +12V common mode input voltage range

• Tri-statable Rx available (active low or high EN input)

• 5V tolerant logic inputs when VCC ≤ 5V

Applications

• Clock distribution

• High node count systems

• Space constrained systems

•Security camera networks

• Building environmental control/lighting systems

• Industrial/process control networks

TABLE 1. SUMMARY OF FEATURES

PART NUMBER

FUNCTION

DATA RATE

(Mbps)

# DEVICES

ON BUS

RX

ENABLE?

(µA)

LOW POWER

SHUTDOWN?

LEAD

COUNT

ISL3280E

1 Rx

20

256

NO

NO

350

NO

5-SOT

ISL3281E

1 Rx

20

256

ACTIVE HIGH

NO

350

YES

6-SOT

ISL3282E

1 Rx

20

256

ACTIVE LOW

YES

350

YES

8-TDFN

ISL3283E

1 Rx

20

256

ACTIVE LOW

NO

350

YES

6-SOT

ISL3284E

1 Rx

20

256

NO

YES

350

NO

6-SOT

ISL3285E

(No longer available or supported)

1 Rx

20

256

ACTIVE HIGH

YES

350

YES

8-TDFN

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

1-888-INTERSIL or 1-888-468-3774

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.

July 27, 2015

FN6543.4