IS31IO7325 Datasheet, PDF (1/15 Pages) Integrated Silicon Solution, Inc – MULTI-FUNCTION I/O DRIVER

IS31IO7325
MULTI-FUNCTION I/O DRIVER
GENERAL DESCRIPTION
The IS31IO7325 2-wire serial-interfaced peripheral
features 16 I/O ports. Ports are divided into eight push
pull I/Os and eight open-drain I/Os and transition
detection.
Any of the 16 I/O ports can be configured as an input
or an output. All I/O ports configured as inputs are
continuously monitored for state changes (transition
detection). State changes are indicated by the INT ^_______
output. The interrupt is latched, allowing detection of
transient changes. When the IS31IO7325 is
subsequently read through the serial interface, any
pending interrupt is cleared.
The open-drain outputs are rated to sink 20mA at
0.22V headroom, and are capable of driving LEDs.
________
The RST input clears the serial interface, terminating
any I²C communication to or from the IS31IO7325. The
IS31IO7325 uses two address inputs to allow 4 I²C
slave addresses. The slave address also determines
the power-up logic state for the I/O ports.
August 2012
FEATURES
 400kHz I²C serial interface
 2.4V to 5.5V operation
 8 push-pull I/O ports
 8 open-drain I/O ports, rated to 20mA sink current
at 0.22V headroom
 Selectable I/O port power-up default logic states
_______
 INT output alerts change on inputs
 Low 0.3μA (Typ.) standby current
 -40°C ~ +125°C temperature range
APPLICATIONS
 Cell phones
 Notebooks
 SAN/NAS
 Satellite radio
 Servers
 Automotive
TYPICAL APPLICATION CIRCUIT
SCL
SDA
INT
RST
VDD2
4.7k
4.7k
4.7k
100 k
VDD1
1 uF
Vcc _{OD 0}
SCL
OD 1
OD 2
SDA
OD 3
OD 4
INT
OD 5
OD 6
RST
OD 7
PP 0
PP 1
PP 2
PP 3
AD 1
AD 0
PP 4
GND
PP 5
PP 6
PP 7
VDD2
100k
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
INPUT / OUTPUT
Note:
VDD1: 2.4V~5.5V, 2.8V is recommended.
VDD2: 1.4V~5.5V, VDD2≤VDD1, 2.8V is recommended.
VDD2 should be turned off when system power off because OD ports are open default!
VDD2 = Vbat is forbidden.
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.B, 07/25/2012