MAX7319 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – I2C Port Expander with Eight Inputs and Maskable Transition Detection

19-3809; Rev 1; 10/05
I²C Port Expander with Eight Inputs and
Maskable Transition Detection
General Description
The MAX7319 2-wire serial-interfaced peripheral fea-
tures eight input ports with selectable internal pullups,
overvoltage protection to +6V, and transition detection
with interrupt output.
All input ports are continuously monitored for state
changes (transition detection). Transitions are latched,
allowing detection of transient changes. Any combination
of inputs can be selected using the interrupt mask to
assert the INT output. When the MAX7319 is subsequently
accessed through the serial interface, any pending inter-
rupt is cleared.
The +5.5V tolerant RST input clears the serial interface,
terminating any I²C communication to or from the
MAX7319.
The MAX7319 uses two address inputs with four-level
logic to allow 16 I²C slave addresses. The slave
address also enables or disables internal 40kΩ pullups
in groups of four ports.
The MAX7319 supports hot insertion. All eight input
ports, the serial interface SDA, SCL, AD0, AD2, INT,
and RST remain high impedance in power-down (V+ =
0) with up to +6V asserted on them.
The MAX7319 is one device in a family of pin-compatible
port expanders with a choice of input ports, open-drain
I/O ports, and push-pull output ports (see Table 1).
The MAX7319 is available in 16-pin QSOP and 16-pin
TQFN packages, and is specified over the automotive
temperature range (-40°C to +125°C).
Features
o 400kHz, +5.5V-Tolerant I²C Serial Interface
o +1.71V to +5.5V Operating Voltage
o Eight Input Ports with Maskable, Latching
Transition Detection
o Input Ports are Overvoltage Protected to +6V
o Transient Changes are Latched, Allowing
Detection Between Read Operations
o INT Output Alerts Change on Any Selection of
Inputs
o AD0 and AD2 Inputs Select from 16 Slave
Addresses
o Low 0.6µA (typ) Standby Current
o -40°C to +125°C Operating Temperature Range
Ordering Information
PART
PIN-PACKAGE TOP MARK PKG CODE
MAX7319AEE+ 16 QSOP
—
E16-4
MAX7319ATE+ 16 TQFN-EP*
ADA
T1633-4
Note: All devices specified over -40°C to +85°C operating range.
+Denotes lead-free package.
*EP = Exposed pad.
Cell Phones
SAN/NAS
Servers
Applications
Notebooks
Satellite Radio
Automotive
Pin Configurations, Typical Application Circuit, and
Functional Diagram appear at end of data sheet.
Selector Guide
PART
INPUTS
INTERRUPT MASK
OPEN-DRAIN OUTPUTS
PUSH-PULL OUTPUTS
MAX7319
8
Yes
—
—
MAX7320
—
—
—
8
MAX7321
Up to 8
—
Up to 8
—
MAX7322
4
Yes
—
4
MAX7323
Up to 4
—
Up to 4
4
MAX7328*
—
—
Up to 8
Up to 8
MAX7329**
—
—
*Second source to PCF8574.
**Second source to PCF8574A.
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 components 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.