PCF8574A Expander Datasheet

PCF8574A Datasheet, PDF, Equivalent


Part Number

PCF8574A

Description

Remote 8-Bit I/O Expander

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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PCF8574A
SCPS069F – JULY 2001 – REVISED NOVEMBER 2015
PCF8574A Remote 8-Bit I/O Expander for I2C Bus
1 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
2 Applications
• Telecom Shelters: Filter Units
• Servers
• Routers (Telecom Switching Equipment)
• Personal Computers
• Personal Electronics
• Industrial Automation
• Products with GPIO-Limited Processors
1
3 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 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.
Device Information(1)
PART NUMBER
PACKAGE (PIN)
BODY SIZE (NOM)
VQFN (20)
4.50 mm × 3.50 mm
PDIP (16)
19.30 mm × 6.35 mm
PCF8574A
SOIC (16)
10.30 mm × 7.50 mm
TSSOP (20)
6.50 mm × 4.40 mm
TVSOP (20)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
I2C or SMBus Master
(e.g. Processor)
SDA
SCL
INT
A0
A1
A2
GND
VCC
PCF8574A
P0
P1
P2
P3
P4
P5
P6
P7
Peripheral Devices
RESET, ENABLE,
or control inputs
INT or status
outputs
LEDs
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.

PCF8574A
PCF8574A
SCPS069F – JULY 2001 – REVISED NOVEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings .................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 I2C Interface Timing Requirements........................... 5
6.7 Switching Characteristics .......................................... 5
6.8 Typical Characteristics .............................................. 6
7 Parameter Measurement Information .................. 8
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ....................................... 11
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 13
9 Application and Implementation ........................ 15
9.1 Application Information............................................ 15
9.2 Typical Application ................................................. 15
10 Power Supply Recommendations ..................... 18
10.1 Power-On Reset Requirements ........................... 18
11 Layout................................................................... 20
11.1 Layout Guidelines ................................................. 20
11.2 Layout Example .................................................... 20
12 Device and Documentation Support ................. 21
12.1 Trademarks ........................................................... 21
12.2 Electrostatic Discharge Caution ............................ 21
12.3 Glossary ................................................................ 21
13 Mechanical, Packaging, and Orderable
Information ........................................................... 21
4 Revision History
Changes from Revision E (January 2015) to Revision F
Page
• Added Junction temperature to the Absolute Maximum Ratings(2) ....................................................................................... 4
• Changed Supply Current (A) To: Supply Current (µA) and fSCL = 400 kHz to fSCL = 100 kHz in Figure 1 ............................ 6
• Changed Supply Current (A) To: Supply Current (µA) in Figure 2 ........................................................................................ 6
• Changed Supply Current (A) To: Supply Current (µA) and fSCL = 400 kHz to fSCL = 100 kHz in Figure 3 ............................ 6
Changes from Revision D (October 2005) to Revision E
Page
• Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Typical Characteristics, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
• Deleted Ordering Information table. ....................................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: PCF8574A
Copyright © 2001–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCF8574A SCPS069F – JULY 2 001 – REVISED NOVEMBER 2015 PCF8574A Remote 8-Bit I/O Expander for I2C Bus 1 Features • Low Standby-Current Cons umption of 10 μA Max • I2C to Parall el-Port Expander • Open-Drain Interru pt Output • Compatible With Most Micr ocontrollers • Latched Outputs With H igh-Current Drive Capability for Direct ly Driving LEDs • Latch-Up Performanc e Exceeds 100 mA Per JESD 78, Class II 2 Applications • Telecom Shelters: Fi lter Units • Servers • Routers (Tel ecom Switching Equipment) • Personal Computers • Personal Electronics • Industrial Automation • Products with GPIO-Limited Processors 1 3 Descript ion This 8-bit input/output (I/O) expan der for the two-line bidirectional bus (I2C) is designed for 2.5-V to 6-V VCC operation. The PCF8574A device provides general-purpose remote I/O expansion f or most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].
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