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PCA9554A

SCPS127E – SEPTEMBER 2006 – REVISED JUNE 2014

Configuration Registers

1 Features

2 Description

This 8-bit I/O expander for the two-line bidirectional

1

•

•

Open-Drain Active-Low Interrupt Output

operation. It provides general-purpose remote I/O

•

Operating Power-Supply Voltage Range of 2.3 V

to 5.5 V

interface [serial clock (SCL), serial data (SDA)].

•

5-V Tolerant I/Os

The PCA9554A consists of one 8-bit Configuration

•

(input or output selection), Input, Output, and Polarity

Inversion (active high or active low) registers. At

•

Three Hardware Address Pins Allow up to Eight

power on, the I/Os are configured as inputs with a

•

Input/Output Configuration Register

enable the I/Os as either inputs or outputs by writing

•

Polarity Inversion Register

to the I/O configuration bits. The data for each input

or output is kept in the corresponding Input or Output

•

Internal Power-On Reset

register. The polarity of the Input Port register can be

•

Power-Up With All Channels Configured as Inputs

inverted with the Polarity Inversion register. All

•

No Glitch on Power Up

registers can be read by the system master.

•

Latched Outputs With High-Current Drive

The system master can reset the PCA9554A in the

Maximum Capability for Directly Driving LEDs

event of a timeout or other improper operation by

•

Latch-Up Performance Exceeds 100 mA Per

utilizing the power-on reset feature, which puts the

registers in their default state and initializes the

JESD 78, Class II

•

ESD Protection Exceeds JESD 22

The PCA9554A open-drain interrupt (INT) output is

–

2000-V Human-Body Model (A114-A)

activated when any input state differs from its

–

200-V Machine Model (A115-A)

corresponding Input Port register state and is used to

–

1000-V Charged-Device Model (C101)

indicate to the system master that an input state has

changed.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SSOP (16)

6.20 mm × 5.30 mm

PCA9554A

VQFN (16)

4.00 mm × 4.00 mm

QFN (16)

3.00 mm × 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.