Inductive Kickback Protection

The MAX4820/MAX4821 feature built-in inductive kick-

back protection to reduce the voltage spike on OUT_

generated by a relay’s coil inductance when the output

is suddenly switched off. Internal diodes connected

from each output to COM allow the inductor current to

flow back to the supply. Connect the common cathode

COM also can be connected to a higher voltage than

figuration, bypass COM to PGND with a 0.1µF capacitor.

3.3V/+5V, 8-Channel, Cascadable Relay Drivers

with Serial/Parallel Interface

_______________________________________________________________________________________

9

COMPANY

PHONE

WEBSITE

Aromat Corp.

310-524-9862 www.aromat.com

CP Clare Corp.

978-524-6700 www.crouzet.com

Coto Techonology

401-943-2686 www.cotorelay.com

Deustch Relays,

Inc.

516-499-6000 www.deutschrelays.com

Fujitsu

Takamisawa

408-745-4900 www.fujitsufta.com

Hella KG Hueck

734-414-0970 www.hella.com

COMPANY

PHONE

WEBSITE

NEC Electronics,

Inc.

800-366-9782 www.nec-global.com

Omron

Electronics, Inc.

847-843-7900 www.oeiweb.omron.com

Rockwell/Allen-

Bradley

414-382-2000 www.ab.com

Siemens

Electromechanical

Component, Inc.

770-371-3000 www.sec.siemens.com

Teledyne Relays

213-777-0077 www.teledynerelays.com

Relay Manufacturers

Typical Application Circuits

MAX4820

RESET

SET

CLK

CS

DIN

DOUT

OUT1

RELAY

COIL 1

RELAY

COIL 8

OUT8

COM

PGND

0.1

µF

GND

MAX4821

RESET

SET

A0

A1

CS

LVL

OUT1

RELAY

COIL 1

RELAY

COIL 8

OUT8

COM

PGND

0.1

µF

GND

A2