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MAX7325 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX7325
Description  I2C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX7325 Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX7325 2-wire serial-interfaced peripheral features
16 I/O ports. Ports are divided into eight push-pull out-
puts and eight I/Os with selectable internal pullups and
transition detection. Eight ports are push-pull outputs
and eight I/Os may be used as a logic input or an open-
drain output. Ports are overvoltage protected to +6V.
All I/O ports configured as inputs are continuously mon-
itored for state changes (transition detection). State
changes are indicated by the INT output. The interrupt
is latched, allowing detection of transient changes.
When the MAX7325 is subsequently accessed through
the serial interface, any pending interrupt is cleared.
The 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 MAX7325.
The MAX7325 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 40k
pullups in groups of four ports.
The MAX7325 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 MAX7325 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
Notebooks
SAN/NAS
Satellite Radio
Servers
Automotive
Features
♦ 400kHz I2C Serial Interface
♦ +1.71V to +5.5V Operation
♦ 8 Push-Pull Outputs
♦ 8 Open-Drain I/O Ports, Rated to 20mA Sink
Current
♦ I/O Ports are Overvoltage Protected to +6V
♦ Selectable I/O Port Power-Up Default Logic States
♦ 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 Temperature Range
I2C Port Expander with 8 Push-Pull
and 8 Open-Drain I/Os
________________________________________________________________ Maxim Integrated Products
1
19-3807; Rev 0; 9/06
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.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX7325AEG+
-40°C to +125°C 24 QSOP
E24-1
MAX7325ATG+
-40°C to +125°C
24 TQFN-EP*
(4mm x 4mm)
T2444-3
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
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
+Denotes lead-free package.
*EP = Exposed paddle.
TQFN (4mm x 4mm)
+
TOP VIEW
MAX7325
19
20
21
22
12
3
4
5
6
18
17
16
15
14
13
23
24
12
11
10
9
8
7
SCL
V+
SDA
INT
AD2
RST
O10
O8
O9
GND
P6
P7
EXPOSED PADDLE
Pin Configurations
Pin Configurations continued at end of data sheet.


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