19-3805; Rev 0; 8/06
2
I C Port Expander with 12 Push-Pull Outputs
and 4 Open-Drain I/Os
General Description
Features
2
♦ 400kHz I C Serial Interface
The MAX7327, a 2-wire serial-interfaced peripheral,
features 12 push-pull outputs and four configurable
open-drain I/O ports with selectable internal pullups
and transition detection. Ports are overvoltage protect-
ed to +6V, independent of supply voltage.
♦ +1.71V to +5.5V Operating Voltage
♦ 12 Push-Pull Output Ports, Rated at 20mA Sink
Current
♦ 4 Open-Drain I/O Ports, Rated at 20mA Sink Current
♦ I/O Ports are Overvoltage Protected to +6V
♦ Selectable I/O Port Power-Up Default Logic States
The four I/O ports configured as inputs are continuously
monitored for state changes (transition detection). State
changes are indicated by the open-drain, +6V-tolerant
INT output. The interrupt is latched, detecting transient
changes. When the MAX7327 is subsequently accessed
through the serial interface, any pending interrupt is
cleared. The 12 push-pull and the four open-drain out-
puts are rated to sink 20mA, and are capable of driving
LEDs. The RST input clears the serial interface, terminat-
♦ Transient Changes are Latched, Allowing Detection
Between Read Operations
♦ INT Output Alerts Changes on Inputs
♦ AD0 and AD2 Inputs Select from 16 Slave
Addresses
♦ Low 0.6µA (typ) Standby Current
♦ -40°C to +125°C Temperature Range
2
ing any I C* communication to or from the MAX7327.
The MAX7327 uses two address inputs with four-level
logic to allow 16 I C slave addresses. The slave
2
address also determines the power-up logic state for
the I/O ports, and enables or disables internal 40kΩ
pullups in groups of two ports.
Ordering Information
PKG
CODE
The MAX7327 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).
PART
TEMP RANGE PIN-PACKAGE
MAX7327AEG+ -40°C to +125°C 24 QSOP
E24-1
24 TQFN-EP**
(4mm x 4mm)
The MAX7327 is available in the 24-pin QSOP and
TQFN packages, and is specified over the -40°C to
+125°C automotive temperature range.
MAX7327ATG+ -40°C to +125°C
MAX7327AATG+ -40°C to +125°C
T2444-3
24 TQFN-EP**
(3.5mm x 3.5mm)
T243A3-1
Applications
+Denotes lead-free package.
**EP = Exposed pad.
Cell Phones
SAN/NAS
Servers
Notebooks
Satellite Radio
Automotive
Selector Guide
Pin Configurations
OPEN-
INTERRUPT
PUSH-PULL
DRAIN
PART
INPUTS
MASK
OUTPUTS
OUTPUTS
TOP VIEW
SCL
18 17 16 15 14 13
MAX7324
8
Yes
—
—
8
8
19
12
O10
MAX7325 Up to 8
MAX7326
MAX7327 Up to 4
Up to 8
—
SDA 20
11 O9
4
Yes
—
12
12
21
22
23
24
10
9
V+
O8
Up to 4
MAX7327
INT
GND
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
RST
AD2
O7
O6
8
EXPOSED PADDLE
7
*Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms
to the I2C Standard Specification as defined by Philips.
1
2
3
4
5
6
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.
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