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Product details

Parameters

Number of I/Os 8 Features Interrupt pin VCC (Min) (V) 2.5 VCC (Max) (V) 6 Addresses 8 Rating Catalog Frequency (Max) (kHz) 100 Operating temperature range (C) -40 to 85 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 7.52 x 10.28 TSSOP (PW) 20 42 mm² 6.5 x 6.4 TVSOP (DGV) 20 32 mm² 5 x 6.4 VQFN (RGT) 16 9 mm² 3 x 3 VQFN (RGY) 20 16 mm² 3.5 x 4.5 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Features

  • Low Standby-Current Consumption of 10 µA 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
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Description

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

The PCF8574 device provides general-purpose remote I/O expansion for most microcontroller families by way of 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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Type Title Date
* Data sheet PCF8574 Remote 8-Bit I/O Expander for I2C Bus datasheet (Rev. J) Mar. 09, 2016
Application notes I2C Dynamic Addressing Apr. 25, 2019
Application notes Choosing the Correct I2C Device for New Designs Sep. 07, 2016
Application notes Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) Dec. 02, 2015
Application notes Understanding the I2C Bus Jun. 30, 2015
Application notes Maximum Clock Frequency of I2C Bus Using Repeaters May 15, 2015
Application notes I2C Bus Pull-Up Resistor Calculation Feb. 13, 2015
Application notes Programming Fun Lights With TI's TCA6507 Nov. 30, 2007
More literature PCF8574 and PCF8574A Application Clip Aug. 18, 2004
More literature I2C Application Clip Jul. 19, 2004
Application notes Semiconductor Packing Material Electrostatic Discharge (ESD) Protection Jul. 08, 2004
More literature I2C and Serial Bus Devices Application Clip Jul. 10, 2003
Application notes Improving System Interrupt Management Using the PCF8574 and PCF8574A I/O Expande Jul. 27, 2001

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SCEM499.ZIP (47 KB) - IBIS Model
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SOIC (DW) 16 View options
TSSOP (PW) 20 View options
TVSOP (DGV) 20 View options
VQFN (RGT) 16 View options
VQFN (RGY) 20 View options

Ordering & quality

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