Datasheet

Driving Load Currents Higher than 20mA
The MAX7323 can be used to drive loads, such as relays,
that draw more than 20mA by paralleling outputs. Use at
least one output per 20mA of load current; for example,
a 5V, 330mW relay draws 66mA, and therefore, requires
four paralleled outputs. Any combination of outputs can
be used as part of a load-sharing design because any
combination of ports can be set or cleared at the same
time by writing to the MAX7323. Do not exceed a total
sink current of 100mA for the device.
The MAX7323 must be protected from the
negative voltage transient generated when switching off
inductive loads (such as relays), by connecting a reverse-
biased diode across the inductive load. Choose the peak
current for the diode to be greater than the inductive load’s
operating current.
Power-Supply Considerations
The MAX7323 operates with a supply voltage of +1.71V
to +5.5V over the -40°C to +125°C temperature range.
Bypass the supply to GND with a ceramic capacitor of
at least 0.047µF as close as possible to the device. For
the TQFN version, additionally connect the exposed
pad to GND.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND PATTERN
NO.
16 QSOP E16+4 21-0055 90-0167
16 TQFN-EP T1633+4 21-0136 90-0031
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD0
V+
SDA
SCL
INT
O7
O6
P5
P4
MAX7323
QSOP
RST
AD2
P2
O0
O1
P3
GND
+
15
16
14
13
5
6
7
O1
P2
8
AD2
O7 O6 SCL
1 3
V+
4
12 10 9
AD0
RST
P5
P4
GND
P3
MAX7323
O0 INT
2
11
SDA
TQFN
TOP VIEW
*EP
*EXPOSED PAD, CONNECTED TO GND
+
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Pin Congurations
www.maximintegrated.com
Maxim Integrated │ 14
MAX7323 I
2
C Port Expander with 4 Push-Pull
Outputs and 4 Open-Drain I/Os