MAX7322_14 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs

MAX7322
EVALUATION KIT AVAILABLE
I²C Port Expander with
4 Push-Pull Outputs and 4 Inputs
General Description
The MAX7322 2-wire serial-interfaced peripheral features
four push-pull outputs and four input ports with selectable
internal pullups. Input ports are overvoltage protected to
+6V and feature transition detection with interrupt output.
The four input ports are continuously monitored for state
changes (transition detection). The interrupt is latched,
allowing detection of transient changes. Any combination
of inputs can be selected using the interrupt mask to
assert the open-drain INT output. When the MAX7322 is
subsequently accessed through the serial interface, any
pending interrupt is cleared.
The four push-pull outputs are rated to sink 20mA, and
are capable of driving LEDs.
The RST input clears the serial interface, terminating any
I²C communication to or from the MAX7322.
The MAX7322 uses two address inputs with four-level
logic to allow 16 I²C slave addresses. The slave address
also sets the power-up default logic state for the four out-
put ports, and enables or disables internal 40kΩ pullups
for the input ports.
The MAX7322 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 MAX7322 is available in 16-pin QSOP and TQFN
packages, and is specified over the -40°C to +125°C
automotive temperature range.
Applications
●● Cell Phones
●● SAN/NAS
●● Servers
●● Notebooks
●● Satellite Radio
Pin Configurations
TOP VIEW
12 11 10 9
SDA 13
8 I5
V+ 14
AD0 15
MAX7322
7 I4
6 GND
RST 16 ₊ ^*EP
5 I3
1234
TQFN
(3mm x 3mm)
Pin Configurations continued at end of data sheet.
Features
●● 400kHz I²C Serial Interface
●● +1.71V to +5.5V Operation Voltage
●● 4 Push-Pull Output Ports Rated at 20mA Sink
Current
●● 4 Input Ports with Maskable, Latching Transition
Detection
●● Input Ports are Overvoltage Protected to +6V
●● Transient Changes are Latched, Allowing
Detection Between Read Operations
●● INT Output Alerts Change on Any Selection of Inputs
●● AD0 and AD2 Inputs Select from 16 Slave Addresses
●● Low 0.6µA (typ) Standby Current
●● -40°C to +125°C Operating Temperature Range
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7322AEE+ -40°C to +125°C 16 QSOP
MAX7322ATE+
-40°C to +125°C
16 TQFN-EP*
(3mm x 3mm)
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
TOP
MARK
—
ADD
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 Up to 8
—
Up to 8
—
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
19-3787; Rev 2; 5/14