PCA8574/74A

General description

The PCA8574/74A provide general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional I²C-bus (serial clock (SCL), serial data (SDA)).

The devices consist of an 8-bit quasi-bidirectional port and an I²C-bus interface. The PCA8574/74A have low current consumption and include latched outputs with 25 mA high current drive capability for directly driving LEDs.

The PCA8574/74A also possess an interrupt line (INT) that can be connected to the interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C-bus.

The internal Power-On Reset (POR) initializes the I/Os as inputs.

Features

• 400 kHz I²C-bus interface
• 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
• 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
• 8 programmable slave addresses using 3 address pins
• Readable device ID (manufacturer, device type, and revision)
• Low standby current (10 uA max.)
• -40 Cel to +85 Cel operation
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
• Packages offered: DIP16, SO16, TSSOP16, SSOP20

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Applications

• LED signs and displays
• Servers
• Industrial control
• Medical equipment
• PLCs
• Cellular telephones
• Gaming machines
• Instrumentation and test measurement

Related applications
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
LCD TV - MMS functionality
Set-top box - MMS functionality

Block diagrams/pinning

Design support

Application Notes

AN10441; Level shifting techniques in I2C-bus design (2007-06-20)

AN256; PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus (2009-03-23)

Support Documents

75016543; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)

UM10206; I2C Demonstration Board 2005-1 Quick Start Guide (2006-06-13)

UM10204; I2C-bus specification and user manual (2007-06-26)

web; IBIS and HSPICE Model ()

75016535; NXP 4/8/16-bit I²C/SMBus GPIO expanders PCA9536/54/54A/55 (2008-08-01)

UM10267; PCA9698 demonstration board OM6281 (2008-09-26)

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer