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NXP Semiconductors Electronic Components Datasheet

PCA8574 Datasheet

Remote 8-bit I/O expander

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PCA8574; PCA8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
Rev. 3 — 3 June 2013
Product data sheet
1. General description
The PCA8574/74A provides general-purpose remote I/O expansion via the two-wire
bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).
The devices consist of eight quasi-bidirectional ports, 400 kHz I2C-bus interface, three
hardware address inputs and interrupt output operating between 2.3 V and 5.5 V. The
quasi-bidirectional port can be independently assigned as an input to monitor interrupt
status or keypads, or as an output to activate indicator devices such as LEDs. The system
master can read from the input port or write to the output port through a single register.
The low current consumption of 4.5 A (typical, static) is great for mobile applications and
the latched output ports have 25 mA high current sink drive capability for directly driving
LEDs.
The PCA8574 and PCA8574A are identical, except for the different fixed portion of the
slave address. The three hardware address pins allow eight of each device to be on the
same I2C-bus, so there can be up to 16 of these I/O expanders PCA8574/74A together on
the same I2C-bus, supporting up to 128 I/Os (for example, 128 LEDs).
The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic
of the microcontroller and is activated when any input state differs from its corresponding
input port register state. It is used to indicate to the microcontroller that an input state has
changed and the device needs to be interrogated without the microcontroller continuously
polling the input register via the I2C-bus.
The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internal
pull-up 100 A current source.
2. Features and benefits
I2C-bus to parallel port expander
400 kHz I2C-bus interface (Fast-mode I2C-bus)
Operating supply voltage 2.3 V to 5.5 V with 5.5 V tolerant I/Os held to VDD with
100 A current source
8-bit remote I/O pins that default to inputs at power-up
Latched outputs with 25 mA sink capability for directly driving LEDs
Total package sink capability of 200 mA
Active LOW open-drain interrupt output
Eight programmable slave addresses using three address pins
Low standby current (4.5 A typical)
40 C to +85 C operation


NXP Semiconductors Electronic Components Datasheet

PCA8574 Datasheet

Remote 8-bit I/O expander

No Preview Available !

NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per
JESD22-C101
Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
Packages offered: SO16, TSSOP16, SSOP20
3. Applications
LED signs and displays
Servers
Key pads
Industrial control
Medical equipment
PLCs
Cellular telephones
Mobile devices
Gaming machines
Instrumentation and test measurement
4. Ordering information
Table 1. Ordering information
Type number Topside mark Package
Name
PCA8574D[1]
PCA8574D SO16
PCA8574AD[2] PCA8574AD
PCA8574PW PCA8574
TSSOP16
PCA8574APW PA8574A
PCA8574TS[3] PCA8574
SSOP20
PCA8574ATS[4] PA8574A
Description
Version
plastic small outline package; 16 leads; body width 7.5 mm SOT162-1
plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
plastic shrink small outline package; 20 leads;
body width 4.4 mm
SOT403-1
SOT266-1
[1] PCA8574D drop-in replacement for PCF8574T/3.
[2] PCA8574AD drop-in replacement for PCF8574AT/3.
[3] PCA8574TS drop-in replacement for PCF8574TS/3.
[4] PCA8574ATS drop-in replacement for PCF8574ATS/3.
PCA8574_PCA8574A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 3 June 2013
© NXP B.V. 2013. All rights reserved.
2 of 32


Part Number PCA8574
Description Remote 8-bit I/O expander
Maker NXP
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PCA8574 Datasheet PDF






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