Datasheet

(T
A
= +25°C, unless otherwise noted.)
PIN
NAME FUNCTION
QSOP TQFN
1, 3 15, 1
AD0,
AD2
Address Inputs. Select device slave address with AD0 and AD2. Connect AD0 and
AD2 to either GND, V+, SCL, or SDA to give four logic combinations (see Table 3).
2 16 RST Reset Input, Active Low. Drive RST low to clear the 2-wire interface.
4–7, 9–12 2–5, 7–10 P0–P7 Input/output Ports. P0 to P7 are open-drain I/Os.
8 6 GND Ground
13 11 INT Interrupt Output. INT is an open-drain output.
14 12 SCL I
2
C-Compatible Serial-Clock Input
15 13 SDA I
2
C-Compatible Serial-Data I/O
16 14 V+
Positive Supply Voltage. Bypass V+ to GND with a ceramic capacitor of at least
0.047µF as close to the device as possible.
— EP EP Exposed Pad. Connect exposed pad to GND.
OUTPUT VOLTAGE LOW
vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT VOLTAGE LOW (V)
MAX7321 toc03
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
V+ = +5.0V
I
SINK
= 20mA
V+ = +2.5V
I
SINK
= 10mA
V+ = +1.71V
I
SINK
= 5mA
V+ = +3.3V
I
SINK
= 15mA
0
20
10
40
30
50
60
-40 -10 5 20-25 35 50 65 80 95 110 125
SUPPLY CURRENT vs. TEMPERATURE
MAX7321 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
V+ = +3.3V
V+ = +5.0V
V+ = +1.71V
V+ = +2.5V
f
SCL
= 400kHz
0
0.4
0.2
1.0
0.8
0.6
1.2
1.4
1.8
1.6
2.0
-40 -10 5-25 20 35 50 65 80 95 110 125
STANDBY CURRENT vs. TEMPERATURE
MAX7321 toc01
TEMPERATURE (°C)
STANDBY CURRENT (µA)
V+ = +3.3V
V+ = +2.5V
V+ = +5.0V
V+ = +1.71V
f
SCL
= 0kHz
Maxim Integrated │ 4
www.maximintegrated.com
MAX7321 I
2
C Port Expander with 8 Open-Drain I/Os
Pin Description
Typical Operating Characteristics