PI4IOE5V9557 Datasheet, PDF (1/15 Pages) Pericom Semiconductor Corporation – SMBus I/O port with reset

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PI4IOE5V9557
8-bit I²C-bus and SMBus I/O port with reset
Features
 Operation power supply voltage from 2.3V to 5.5V
 8-bit I²C-bus GPIO with interrupt and reset
 5V tolerant I/Os
 Polarity inversion register
 Active LOW Reset Pin
 Low current consumption
 0Hz to 400KHz clock frequency
 Noise filter on SCL/SDA inputs
 Power-on reset
 ESD protection (4KV HBM and 1KV CDM)
 Offered in three different packages:SOIC-16,
TSSOP-16 and TQFN 4x4-16
Description
The PI4IOE5V9557 provide 8 bits of General Purpose
parallel Input/Output (GPIO) expansion for I²C-
bus/SMBus applications. It includes the features such as
higher driving capability, 5V tolerance, lower power
supply, individual I/O configuration, and smaller
packaging. It provides a simple solution when additional
I/O is needed for ACPI power switches, sensors, push
buttons, LEDs, fans, etc.
The PI4IOE5V9557 consists of an 8-bit register to
configure the I/Os as either inputs or outputs, and an 8-
bit polarity register to change the polarity of the input
port register. The data for each input or output is kept in
the corresponding Input port or Output port register. All
registers can be read by the system master.
The power-on reset sets the registers to their default
values and initializes the device state machine. The
RESET pin causes the same reset/default I/O input
configuration to occur without de-powering the device,
holding the registers and I²C-bus state machine in their
default state until the RESET input is once again HIGH.
Three hardware pins (A0, A1, A2) vary the fixed
I²C-bus address and allow up to eight devices to share
the same I²C-bus/SMBus.
Pin Configuration
Figure 1: SOIC-16/TSSOP-16 ( Top View )
Figure 2: TQFN 4x4-16 ( Top view )
2015-07-0028
PT0552-2
8/18/15
1