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PCF8574A

ACTIVE

8-bit 2.5- to 5.5-V I2C/SMBus I/O expander with interrupt

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Data sheet

PCF8574A

ACTIVE
Data sheet Order now

Product details

Number of I/Os 8 Features Interrupt pin Addresses 8 Rating Catalog Frequency (max) (MHz) 0.1 Operating temperature range (°C) -40 to 85
Number of I/Os 8 Features Interrupt pin Addresses 8 Rating Catalog Frequency (max) (MHz) 0.1 Operating temperature range (°C) -40 to 85
VQFN (RGY) 20 15.75 mm² (4.5 mm × 3.5 mm) TVSOP (DGV) 20 32 mm² (5 mm × 6.4 mm) PDIP (N) 16 181.42 mm² (19.3 mm × 9.4 mm) SOIC (DW) 16 106.09 mm² (10.3 mm × 10.3 mm) TSSOP (PW) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • Low standby-current consumption of 10µA max
  • I2C to parallel-port expander
  • Open-drain interrupt output
  • Compatible with most microcontrollers
  • Latched outputs with high-current drive capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA Per JESD 78, Class II
  • Low standby-current consumption of 10µA max
  • I2C to parallel-port expander
  • Open-drain interrupt output
  • Compatible with most microcontrollers
  • Latched outputs with high-current drive capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA Per JESD 78, Class II

This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5V to 6V VCC operation.

The PCF8574A device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].

The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.

This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5V to 6V VCC operation.

The PCF8574A device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].

The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet PCF8574A Remote 8-Bit I/O Expander for I2 C Bus datasheet (Rev. H) PDF | HTML Sep 24, 2024
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML Jul 3, 2024
Application note I2C Dynamic Addressing Apr 25, 2019
Application note Choosing the Correct I2C Device for New Designs PDF | HTML Sep 7, 2016
Application note Understanding the I2C Bus PDF | HTML Jun 30, 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters May 15, 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML Feb 13, 2015
More literature PCF8574 and PCF8574A Application Clip Aug 18, 2004
More literature I2C Application Clip Jul 19, 2004
More literature I2C and Serial Bus Devices Application Clip Jul 10, 2003
Application note Improving System Interrupt Management Using the PCF8574 and PCF8574A I/O Expande Jul 27, 2001

Design & development

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Simulation model

PCF8574A IBIS Model

SCEM498.ZIP (47 KB) - IBIS model
Supported products & hardware
Reference design

TIDA-01184 — Smart Power Switch for Seat Heater Reference Design

This reference design showcases the TPS1HA08-Q1 device, which is used to control an automotive seat heater. The system consists of a main board and heating element, which represents the resistive heating component found in automotive seat heaters. This system demonstrates the ability to (...)
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
VQFN (RGY) 20 Ultra Librarian
TVSOP (DGV) 20 Ultra Librarian
PDIP (N) 16 Ultra Librarian
SOIC (DW) 16 Ultra Librarian
TSSOP (PW) 20 Ultra Librarian
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