MAX7311 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection

19-2747; Rev 4; 4/05
2-Wire-Interfaced 16-Bit I/O Port Expander
with Interrupt and Hot-Insertion Protection
General Description
The MAX7311 2-wire-interfaced expander provides 16-bit
parallel input/output (I/O) port expansion for SMBus™
and I²C™ applications. The MAX7311 consists of input
port registers, output port registers, polarity inversion reg-
isters, configuration registers, a bus timeout register, and
an I²C-compatible serial interface logic compatible with
SMBus. The system master can invert the MAX7311 input
data by writing to the active-high polarity inversion regis-
ter. 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 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 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.
For applications requiring I/Os without pullup resistors,
refer to the MAX7312 data sheet.
Applications
Servers
RAID Systems
Industrial Control
Medical Equipment
PLCs
Instrumentation and Test Measurement
Pin Configurations
TOP VIEW
INT 1
AD1 2
AD2 3
I/O0 4
I/O1 5
I/O2 6
I/O3 7
I/O4 8
I/O5 9
I/O6 10
I/O7 11
GND 12
MAX7311
24 V+
23 SDA
22 SCL
21 AD0
20 I/O15
19 I/O14
18 I/O13
17 I/O12
16 I/O11
15 I/O10
14 I/O9
13 I/O8
18 17 16 15 14 13
SCL 19
12 I/O10
SDA 20
11 I/O9
V+ 21
INT 22
MAX7311ATG
10 I/O8
9 GND
AD1 23
8 I/O7
AD2 24
7 I/O6
12 3456
THIN QFN
TSSOP/SSOP/SO
Features
♦ 400kbps I²C-Compatible Serial Interface
♦ 2V to 5.5V Operation
♦ 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)
♦ Bus Timeout for Lock-Up-Free Operation
♦ Noise Filter on SCL / SDA Inputs
♦ 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
Ordering Information
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
PKG
CODE
—
—
T2444-4
—
SMBus is a trademark of Intel Corp.
Purchase of I²C components of Maxim Integrated Products, Inc.
or one of its sublicensed Associated Companies, conveys a
license under the Phillips I²C Patent Rights to use these compo-
nents in an I²C system, provided that the system conforms to the
I²C Standard Specification as defined by Phillips.
________________________________________________________________ Maxim Integrated Products 1
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