MAX7324 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – I2C Port Expander with Eight Push-Pull Outputs and Eight Inputs

19-3785; Rev 0; 10/06
I²C Port Expander with Eight Push-Pull Outputs
and Eight Inputs
General Description
The MAX7324 2-wire serial-interfaced peripheral fea-
tures 16 I/O ports that are divided into eight push-pull
outputs and eight inputs. Each input features selectable
internal pullups, overvoltage protection to +6V, and
transition detection with an interrupt output.
All input ports are continuously monitored for state
changes (transition detection). The interrupt is latched,
allowing detection of transient changes. Any combina-
tion of inputs can be selected using the interrupt mask
to assert the INT output. When the MAX7324 is subse-
quently accessed through the serial interface, any
pending interrupt is cleared.
The 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 MAX7324.
The MAX7324 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 MAX7324 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 MAX7324 is available in 24-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
Automotive
Satellite Radio
Pin Configurations
TOP VIEW
18 17 16 15 14 13
SCL 19
12 O10
SDA 20
V+ 21
INT 22
RST 23
AD2 24 ₊
1
MAX7324
EXPOSED PADDLE
2 3456
11 O9
10 O8
9 GND
8 I7
7 I6
TQFN (4mm x 4mm)
Pin Configurations continued at end of data sheet.
Features
♦ 400kHz, +6V-Tolerant I²C Serial Interface
♦ +1.71V to 5.5V Operating Voltage
♦ Eight Push-Pull Outputs
♦ Eight 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 Standby Current
♦ -40°C to +125°C Temperature Range
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX7324AEG+ -40°C to +125°C 24 QSOP
MAX7324ATG+ -40°C to +125°C ^{24 TQFN-EP*}
(4mm x 4mm)
+Denotes lead-free package.
*EP = Exposed paddle.
PKG
CODE
E24-1
T2444-3
Selector Guide
PART
INPUTS
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-PULL
OUTPUTS
MAX7324 8
Yes
—
8
MAX7325 Up to 8
—
Up to 8
8
MAX7326 4
Yes
—
12
MAX7327 Up to 4
—
Up to 4
12
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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