MAX7318 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – 2-Wire-Interfaced, 16-Bit, I/O Port Expander with Interrupt and Hot-Insertion Protection

19-3381; Rev 2; 4/05
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
General Description
The MAX7318 2-wire-interfaced expander provides 16-
bit parallel input/output (I/O) port expansion for
SMBus™ and I²C™ applications. The MAX7318 con-
sists of input port registers, output port registers, polari-
ty inversion registers, configuration registers, a bus
timeout register, and an I²C-compatible serial interface
logic compatible with SMBus. The system 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
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
MAX7318
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
MAX7318ATG
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
♦ 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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7318AWG -40°C to +125°C 24 Wide SO
MAX7318AAG -40°C to +125°C 24 SSOP
MAX7318ATG -40°C to +125°C ^{24 Thin QFN}
(4mm ✕ 4mm)
MAX7318AUG -40°C to +125°C 24 TSSOP
PKG
CODE
—
—
T2444-4
—
SMBus is a trademark of Intel Corp.
I²C is a trademark of Philips Corp.
Purchase of I²C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips 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 Philips.
________________________________________________________________ Maxim Integrated Products 1
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.