MAX7310
2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset
________________________________________________________________ Maxim Integrated Products 1
19-2698; Rev 3; 2/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
General Description
The MAX7310 provides 8-bit parallel input/output port
expansion for SMBus™-compatible and I
2
C-compatible
applications. The MAX7310 consists of an input port
register, an output port register, a polarity inversion reg-
ister, a configuration register, a bus timeout register,
and an SMBus/I
2
C-compatible serial interface. The sys-
tem master can invert the MAX7310 input data by writ-
ing to the active-high polarity inversion register. The
system master can enable or disable bus timeout by
writing to the bus timeout register.
Any of the eight I/O ports may be configured as input or
output. An active-low reset input sets the eight I/Os as
inputs. Three address select pins configure one of 56
slave ID addresses.
The MAX7310 is available in 16-pin thin QFN, TSSOP,
and QSOP packages and is specified over the -40°C to
+125°C automotive temperature range.
Applications
Servers
RAID Systems
Industrial Control
Medical Equipment
Instrumentation, Test Measurement
Features
♦ 400kHz 2-Wire Interface
♦ 2.3V to 5.5V Operation
♦ Low Standby Current (1.7µA typ)
♦ Bus Timeout for Lock-Up-Free Operation
♦ 56 Slave ID Addresses
♦ Polarity Inversion
♦ Eight I/O Pins that Default to Inputs on Power-Up
♦ 5V Tolerant Open-Drain Output on I/O0
♦ 4mm x 4mm, 0.8mm Thin QFN Package
♦ -40°C to +125°C Operation
Ordering Information