MAX7324_14 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – I2C Port Expander with Eight Push-Pull Outputs and Eight Inputs

MAX7324
EVALUATION KIT AVAILABLE
I²C Port Expander with
Eight Push-Pull Outputs and Eight Inputs
General Description
The MAX7324 2-wire serial-interfaced peripheral features
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 combination
of inputs can be selected using the interrupt mask to
assert the INT output. When the MAX7324 is subsequently
accessed through the serial interface, any pending inter-
rupt 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
●● 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 PAD
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 a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
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.
19-3785; Rev 1; 5/14