19-3806; Rev 1; 7/07
2
I C Port Expander with 4 Push-Pull Outputs
and 4 Open-Drain I/Os
General Description
Features
The MAX7323 2-wire serial-interfaced peripheral fea-
tures eight I/O ports. Four ports are push-pull outputs
and the other four are open-drain I/O ports, indepen-
dent of supply voltage.
♦ 400kHz I2C Serial Interface
♦ +1.71V to +5.5V Operating Voltage
♦ 4 Push-Pull Output Ports Rated at 20mA Sink
Current
The four I/O ports configured as inputs are continu-
ously monitored for state changes (transition detec-
tion). State changes are indicated by the open-drain
INT output. The interrupt is latched, allowing detection
of transient changes. When the MAX7323 is subse-
quently accessed through the serial interface, any
pending interrupt is cleared.
♦ 4 Open-Drain I/O Ports Rated to 20mA Sink Current
♦ 4 I/O Ports Are Overvoltage Protected to +6V
♦ Transient Changes Are Latched, Allowing Detection
Between Read Operations
♦ INT Output Alerts Change on Inputs
♦ AD0 and AD2 Inputs Select from 16 Slave
The four push-pull and four open-drain outputs are
rated to sink 20mA and are capable of driving LEDs.
Addresses
♦ Low 0.6µA (typ) Standby Current
The RST input clears the serial interface, terminating
any I C communication to or from the MAX7323.
2
♦ -40°C to +125°C Operating Temperature Range
The MAX7323 uses two address inputs with four-level
2
logic to allow 16 I C slave addresses. The slave
Ordering Information
address also determines the power-up logic state for
the I/O ports, and enables or disables internal 40kΩ
pullups for the input ports in groups of two ports.
TEMP
PIN-
TOP
PKG
PART
RANGE PACKAGE
MARK CODE
The MAX7323 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).
-40°C to
16 QSOP
+125°C
MAX7323AEE+
MAX7323ATE+
—
E16-4
-40°C to 16 TQFN-EP*
+125°C 3mm x 3mm
The MAX7323 is available in 16-pin QSOP and 16-pin
TQFN packages, and is specified over the automotive
temperature range (-40°C to +125°C).
ADE T1633-4
+Denotes a lead-free package.
*EP = Exposed paddle.
Applications
Cell Phones
SAN/NAS
Servers
Notebooks
RAID
Selector Guide
Automotive
OPEN-
INTERRUPT
MASK
PUSH-PULL
DRAIN
PART
INPUTS
OUTPUTS
OUTPUTS
Typical Application Circuit
MAX7319
MAX7320
8
Yes
—
—
—
8
3.3V
—
—
0.047μF
MAX7321 Up to 8
MAX7322
—
Up to 8
—
—
4
V+
μC
SCL
4
Yes
—
SCL
MAX7323
O7
O6
P5
P4
P3
P2
O1
O0
OUTPUT
OUTPUT
I/O
MAX7323 Up to 4
MAX7328 Up to 8
MAX7329 Up to 8
Up to 4
Up to 8
Up to 8
4
SDA
RST
SDA
RST
—
—
—
—
I/O
INT
INT
I/O
I/O
AD0
AD2
OUTPUT
OUTPUT
GND
Pin Configurations and Functional Diagram appear at end
of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.