General Description
The MAX7318 2-wire-interfaced expander provides 16-
bit parallel input/output (I/O) port expansion for SMBus™
and I
2
C applications. The MAX7318 consists of input
port registers, output port registers, polarity inversion
registers, configuration registers, and an I
2
C-compatible
serial interface logic compatible with SMBus. The sys-
tem master can invert the MAX7318 input data by writing
to the active-high polarity inversion register.
Any of the 16 I/O ports can be configured as an input or
output. A power-on reset (POR) initializes the 16 I/Os
as inputs. Three address select pins configure one of
64 slave ID addresses.
The MAX7318 supports hot insertion. All port pins, the
INT output, SDA, SCL, and the slave address inputs
AD0–2 remain high impedance in power-down (V+ =
0V) with up to 6V asserted upon them.
The MAX7318 is available in 24-pin SO, SSOP, TSSOP,
and thin QFN packages and is specified over the -40°C
to +125°C automotive temperature range.
For applications requiring an SMBus timeout function,
refer to the MAX7311 data sheet.
Applications
Servers
RAID Systems
Industrial Control
Medical Equipment
PLCs
Instrumentation and Test Measurement
Features
♦ 400kbps I
2
C-Compatible Serial Interface
♦ 2V to 5.5V Operation
♦ 5.5V Overvoltage-Tolerant I/Os
♦ Supports Hot Insertion
♦ 16 I/O Pins that Default to Inputs on Power-Up
♦ 100kΩ Pullup on Each I/O
♦ Open-Drain Interrupt Output (INT)
♦ Noise Filter on SCL/SDA Inputs
♦ 64 Slave ID Addresses Available
♦ Low Standby Current (5.4µA typ)
♦ Polarity Inversion
♦ 4mm
✕ 4mm, 0.8mm Thin QFN Package
♦ -40°C to +125°C Operation
MAX7318
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-3381; Rev 3; 12/07
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
SMBus is a trademark of Intel Corp.
EVALUATION KIT
AVAILABLE