Rainbow Electronics MAX7311 User Manual
General description, Applications, Features
General Description
The MAX7311 2-wire-interfaced expander provides 16-
bit parallel input/output (I/O) port expansion for
SMBus™-compatible and I
2
C-compatible applications.
The MAX7311 consists of input port registers, output
port registers, polarity inversion registers, configuration
registers, a bus timeout register, and an SMBus/I
2
C-
compatible serial interface. The system master can
invert the MAX7311 input data by writing 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 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 MAX7311 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.
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
♦ 5V Overvoltage Tolerant I/Os
♦ 16 I/O Pins that Default to Inputs on Power-Up
♦ Open-Drain Interrupt Output (INT)
♦ Bus Timeout for Lock-Up-Free Operation
♦ 64 Slave ID Addresses Available
♦ Low Standby Current (2.9µA typ)
♦ Polarity Inversion
♦ 4mm
✕
4mm, 0.8mm Thin QFN Package
♦ -40°C to +125°C Operation
MAX7311
2-Wire-Interfaced 16-Bit I/O Port Expander
with Interrupt
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-2747; Rev 0; 1/03
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.
SMBus is a trademark of Intel Corp.
PART
TEMP RANGE
PIN-PACKAGE
MAX7311AWG
-40°C to +125°C 24 Wide SO
MAX7311AAG
-40°C to +125°C 24 SSOP
MAX7311ATG
-40°C to +125°C 24 Thin QFN (4mm
✕
4mm)
MAX7311AUG
-40°C to +125°C 24 TSSOP
TOP VIEW
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
V+
SDA
SCL
AD0
I/O0
AD2
AD1
I/O15
I/O14
I/O13
I/O12
I/O4
I/O3
I/O2
I/O1
16
15
14
13
9
10
11
12
I/O11
I/O10
I/O9
I/O8
GND
I/O7
I/O6
I/O5
TSSOP/SSOP/SO
MAX7311
INT
THIN QFN
MAX7311
1
2
3
4
7
8
9
10
11
12
24
23
22
21
20
19
5
6
18
17
16
15
14
13
I/O0
I/O2
I/O1
I/O3
I/O5
I/O6 I/O7 GND I/O8 I/O9 I/O10
AD2 AD1
V
+
SDA SCL
I/O4
AD0
I/O14
I/O15
I/O13
I/O11
I/O12
INT
Pin Configurations