PCF8574 Expander Datasheet

PCF8574 Datasheet, PDF, Equivalent


Part Number

PCF8574

Description

Remote 8-Bit I/O Expander

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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PCF8574
SCPS068J – JULY 2001 – REVISED MARCH 2015
PCF8574 Remote 8-Bit I/O Expander for I2C Bus
1 Features
1 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
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 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.
PART NUMBER
PCF8574
Device Information(1)
PACKAGE (PIN)
BODY SIZE (NOM)
TVSOP (20)
5.00 mm × 4.40 mm
SOIC (16)
10.30 mm × 7.50 mm
PDIP (16)
19.30 mm × 6.35 mm
TSSOP (20)
6.50 mm × 4.40 mm
QFN (16)
3.00 mm × 3.00 mm
VQFN (20)
4.50 mm × 3.50 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
PCF8574
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.

PCF8574
PCF8574
SCPS068J – JULY 2001 – REVISED MARCH 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 .................................................... 21
12 Device and Documentation Support ................. 22
12.1 Trademarks ........................................................... 22
12.2 Electrostatic Discharge Caution ............................ 22
12.3 Glossary ................................................................ 22
13 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
Changes from Revision I (November 2015) to Revision J
Page
• Corrected part number in Device Information table ............................................................................................................... 1
Changes from Revision H (January 2015) to Revision I
Page
• Added Junction temperature to the Absolute Maximum Ratings .......................................................................................... 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 1 ........................................................................................ 6
• Changed Supply Current (A) To: Supply Current (µA) and fSCL = 400 kHz to fSCL = 100 kHz in Figure 3 ............................ 6
Changes from Revision G (May 2008) to Revision H
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: PCF8574
Copyright © 2001–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCF8574 SCPS068J – JULY 20 01 – REVISED MARCH 2015 PCF8574 Remot e 8-Bit I/O Expander for I2C Bus 1 Fea tures •1 Low Standby-Current Consumpt ion of 10 μA Max • I2C to Parallel-P ort Expander • Open-Drain Interrupt O utput • Compatible With Most Microcon trollers • Latched Outputs With High- Current Drive Capability for Directly D riving LEDs • Latch-Up Performance Ex ceeds 100 mA Per JESD 78, Class II 2 Ap plications • Telecom Shelters: Filter Units • Servers • Routers (Telecom Switching Equipment) • Personal Comp uters • Personal Electronics • Indu strial Automation • Products with GPI O-Limited Processors 3 Description Thi s 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) i s designed for 2.5-V to 6-V VCC operati on. 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)]. .
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