Datasheet

(T
A
= +25°C, unless otherwise noted.)
PIN
NAME FUNCTION
QSOP QFN
1 15 SCLK
Serial-Clock Input. On SCLK’s rising edge, data shifts into the internal shift register. On
SCLK’s falling edge, data is clocked out of DOUT. SCLK is active only while CS is low.
2 16 CS
Chip-Select Input. Serial data is loaded into the shift register while CS is low. The most recent
16 bits of data latch on CS’s rising edge.
3–7, 9–13 1–5, 7–11 P0–P9
I/O Ports. P0 to P9 can be configured as open-drain, current-sink outputs rated at 20mA
maximum, or as CMOS inputs, or as open-drain outputs. Loads should be connected to a
supply voltage no higher than 7V.
8 6 GND Ground
14 12 DOUT
Serial-Data Output. The data into DIN is valid at DOUT 15.5 clock cycles later. Use this pin to
daisy-chain several devices or allow data readback. Output is push-pull.
15 13 DIN
Serial-Data Input. Data from DIN loads into the internal 16-bit shift register on SCLK’s rising
edge.
16 14 V+ Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic capacitor.
— PAD
Exposed
pad
Exposed Pad on Package Underside. Connect to GND.
0
0.1
0.3
0.2
0.4
0.5
-40 -10 5 20-25 35 50 65 80 95 110 125
SUPPLY CURRENT (I+)
vs. TEMPERATURE
MAX7317 toc03
TEMPERATURE (°C)
STANDBY CURRENT (mA)
V+ = 3.6V
V+ = 3.3V
V+ = 2.7V
V+ = 2.25V
0.4
0.6
0.5
0.8
0.7
0.9
1.0
-40 -10 5 20-25 35 50 65 80 95 110 125
STANDBY CURRENT
vs. TEMPERATURE
MAX7317 toc02
TEMPERATURE (°C)
STANDBY CURRENT (µA)
V+ = 3.6V
V+ = 3.3V
V+ = 2.7V
V+ = 2.25V
0
3
9
6
12
15
PORT SINK CURRENT
vs. PORT VOLTAGE
MAX7317 toc01
PORT VOLTAGE (V)
PORT SINK CURRENT (mA)
0 42 6 8
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
T
A
= +125°C
Maxim Integrated │ 4
www.maximintegrated.com
MAX7317 10-Port SPI-Interfaced I/O Expander with
Overvoltage and Hot-Insertion Protection
Pin Description
Typical Operating Characteristics