19-3785; Rev 0; 10/06
I
2
C 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 I
2
C communication to or from
the MAX7324.
The MAX7324 uses two address inputs with four-level
logic to allow 16 I
2
C 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.
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
400kHz, +6V-Tolerant I
2
C 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
MAX7324
Ordering Information
PART
MAX7324AEG+
MAX7324ATG+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
24 QSOP
24 TQFN-EP*
(4mm x 4mm)
PKG
CODE
E24-1
T2444-3
Applications
Cell Phones
SAN/NAS
Servers
Notebooks
Automotive
Satellite Radio
+Denotes
lead-free package.
*EP
= Exposed paddle.
Selector Guide
PART
MAX7324
MAX7325
INPUTS
8
Up to 8
4
Up to 4
INTERRUPT
MASK
Yes
—
Yes
—
OPEN-
PUSH-PULL
DRAIN
OUTPUTS
OUTPUTS
—
Up to 8
—
Up to 4
8
8
12
12
Pin Configurations
O15
O13
O12
14
O14
O11
13
12 O10
11 O9
10 O8
TOP VIEW
18
SCL 19
SDA 20
V+ 21
INT 22
RST 23
AD2 24
+
1
I0
AD0
17
16
15
MAX7326
MAX7327
MAX7324
EXPOSED PADDLE
2
I1
3
I2
4
I3
5
I4
6
I5
9
8
7
GND
I7
I6
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
TQFN (4mm x 4mm)
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
