MAX7323 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – I2C Port Expander with 4 Push-Pull Outputs

19-3806; Rev 1; 7/07
I²C Port Expander with 4 Push-Pull Outputs
and 4 Open-Drain I/Os
General Description
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.
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.
The four push-pull and four open-drain 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 MAX7323.
The MAX7323 uses two address inputs with four-level
logic to allow 16 I²C slave addresses. The slave
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.
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).
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).
Cell Phones
SAN/NAS
Servers
Applications
Notebooks
RAID
Automotive
Typical Application Circuit
μC
SCL
SDA
RST
INT
3.3V
V+
SCL MAX7323 _O7
SDA
O6
RST
P5
P4
INT
P3
AD0
P2
AD2
O1
O0
GND
0.047μF
OUTPUT
OUTPUT
I/O
I/O
I/O
I/O
OUTPUT
OUTPUT
Features
♦ 400kHz I²C Serial Interface
♦ +1.71V to +5.5V Operating Voltage
♦ 4 Push-Pull Output Ports Rated at 20mA Sink
Current
♦ 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
Addresses
♦ Low 0.6µA (typ) Standby Current
♦ -40°C to +125°C Operating Temperature Range
Ordering Information
PART
TEMP PIN-
RANGE PACKAGE
TOP PKG
MARK CODE
MAX7323AEE+
-40°C to
+125°C
16 QSOP
— E16-4
MAX7323ATE+ ^{-40°C to 16 TQFN-EP*} ADE T1633-4
+125°C 3mm x 3mm
+Denotes a lead-free package.
*EP = Exposed paddle.
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
—
Pin Configurations and Functional Diagram appear at end
of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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