General Description

The MAX4822–MAX4825 8-channel relay drivers offer

built-in kickback protection and drive +3V/+5V non-

latching or dual-coil-latching relays. Each independent

open-drain output features a 2.7

Ω (typ) on-resistance

and is guaranteed to sink 70mA (min) of load current.

These devices consume less than 300µA (max) quies-

cent current and have 1µA output off-leakage current.

A Zener-kickback-protection circuit significantly

reduces recovery time in applications where switching

speed is critical.

The MAX4822/MAX4824 feature a unique power-save

mode where the relay current, after activation, can be

reduced to a level just above the relay hold-current

threshold. This mode keeps the relay activated while

significantly reducing the power consumption.

The MAX4822/MAX4823 feature a 10MHz SPI™-/

QSPI™-/MICROWIRE™-compatible serial interface.

Input data is shifted into a shift register and latched to

the outputs when CS transitions from low to high. Each

data bit in the shift register corresponds to a specific

output, allowing independent control of all outputs.

The MAX4824/MAX4825 feature a 4-bit parallel-input

interface. The first 3 bits (A0, A1, A2) determine the out-

put address, and the fourth bit (LVL) determines whether

the selected output is switched on or off. Data is latched

to the outputs when CS transitions from low to high.

The MAX4822–MAX4825 feature separate set and reset

functions, allowing turn-on or turn-off of all outputs

simultaneously with a single control line. Built-in hys-

teresis (Schmidt trigger) on all digital inputs allows

these devices to be used with slow-rising and falling

signals, such as those from optocouplers or RC power-

up initialization circuits. The MAX4822–MAX4825 are

available in space-saving 4mm x 4mm, 20-pin thin QFN

packages. They are specified over the -40°C to +85°C

extended temperature range.

Applications

ATE Equipment

DSL Redundancy Protection (ADSL/VDSL/HDSL)

T1/E1 Redundancy Protection

T3/E3 Redundancy Protection

Industrial Equipment

Test Equipment (Oscilloscopes, Spectrum

Analyzers)

Features

♦ Built-In Zener Kickback Protection for Fast

Recovery

♦ Programmable Power-Save Mode Reduces Relay

Power Consumption (MAX4822/MAX4824)

♦ 10MHz SPI-/QSPI-/MICROWIRE-Compatible Serial

Interface

♦ Eight Independent Output Channels

♦ Drive +3V and +5V Relays

♦ Guaranteed 70mA (min) Coil Drive Current

♦ SET / RESET Functions to Turn On/Off All

Outputs Simultaneously

♦ Serial Digital Output for Daisy Chaining

♦ Optional Parallel Interface (MAX4824/MAX4825)

♦ Low 300µA (max) Quiescent Supply Current

♦ Space-Saving, 4mm x 4mm, 20-Pin TQFN Package

+3.3V/+5V, 8-Channel Relay Drivers with Fast

Recovery Time and Power-Save Mode

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3789; Rev 0; 8/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-

PACKAGE

PACKAGE

CODE

MAX4822ETP

-40°C to +85°C

20 TQFN-EP*

T2044-3

MAX4823ETP

-40°C to +85°C

20 TQFN-EP*

T2044-3

MAX4824ETP

-40°C to +85°C

20 TQFN-EP*

T2044-3

MAX4825ETP

-40°C to +85°C

20 TQFN-EP*

T2044-3

*For maximum heat dissipation, packages have an exposed

pad (EP) on the bottom. Solder exposed pad to GND.

Pin Configurations appear at end of data sheet.

SPI is a trademark of Motorola, Inc.

QSPI is a trademark of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

PART

INTERFACE

POWER SAVE

MAX4822

Serial

Yes

MAX4823

Serial

No

MAX4824

Parallel

Yes

MAX4825

Parallel

No

Selector Guide