MAX4820 Maxim, MAX4820 Datasheet - Page 9

• Manufacturer Part Number: MAX4820
• Description: The MAX4820/MAX4821 8-channel relay drivers offer built-in kickback protection and drive +3
• Manufacturer: Maxim

is shifted through all the MAX4820s in series. When CS
goes high, all outputs update simultaneously.
The MAX4820 can also be used in a slave configuration
that allows the user to address individual devices.
Connect all the DIN pins together, and use the CS input
to address one device at a time. Drive CS low to select
a slave and input the data into the shift register. Drive
CS high to latch the data and turn on the appropriate
outputs. Typically, in this configuration only one slave is
addressed at a time.
Aromat Corp.
CP Clare Corp.
Coto Techonology
Deustch Relays,
Inc.
Fujitsu
Takamisawa
Hella KG Hueck
3.3V/+5V, 8-Channel, Cascadable Relay Drivers
COMPANY
DOUT
RESET
SET
CLK
CS
DIN
0.1μF
_______________________________________________________________________________________
310-524-9862 www.aromat.com
978-524-6700 www.crouzet.com
401-943-2686 www.cotorelay.com
516-499-6000 www.deutschrelays.com
408-745-4900 www.fujitsufta.com
734-414-0970 www.hella.com
PHONE
MAX4820
V
V
GND
CC
CC
PGND
COM
OUT1
OUT8
WEBSITE
V
CC
RELAY
COIL 8
RELAY
COIL 1
with Serial/Parallel Interface
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) of the internal protection diodes to V
COM also can be connected to a higher voltage than
V
figuration, bypass COM to PGND with a 0.1µF capacitor.
NEC Electronics,
Inc.
Omron
Electronics, Inc.
Rockwell/Allen-
Bradley
Siemens
Electromechanical
Component, Inc.
Teledyne Relays
CC
COMPANY
(+6V max) for faster kickback recovery. In this con-
Typical Application Circuits
LVL
RESET
SET
A0
A1
A2
CS
0.1μF
Inductive Kickback Protection
800-366-9782 www.nec-global.com
847-843-7900 www.oeiweb.omron.com
414-382-2000 www.ab.com
770-371-3000 www.sec.siemens.com
213-777-0077 www.teledynerelays.com
MAX4821
V
V
GND
Relay Manufacturers
PHONE
CC
CC
PGND
COM
OUT8
OUT1
V
WEBSITE
CC
CC
RELAY
COIL 8
RELAY
COIL 1
.
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