Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsInterface ICsInterface IC - I/O extensions POR I²C 100 kHz SOIC 16

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FEATURES

GND

SDA

SCL

INT

DW OR N PACKAGE

(TOP VIEW)

INT

SCL

SDA

GND

DGV OR PW PACKAGE

(TOP VIEW)

NC − No internal connection

RGY PACKAGE

(TOP VIEW)

1 20

10 11

GND

SCL

SDA

INT

NC − No internal connection

DESCRIPTION/ORDERING INFORMATION

PCF8574A

REMOTE 8-BIT I/O EXPANDER FOR I

C BUS

SCPS069D – JULY 2001 – REVISED OCTOBER 2005

• Low Standby-Current Consumption of • Compatible With Most Microcontrollers

10 µ A Max

• Latched Outputs With High-Current Drive

• I

C to Parallel-Port Expander Capability for Directly Driving LEDs

• Open-Drain Interrupt Output • 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 (I

C) is designed for 2.5-V to 6-V V

operation.

The PCF8574A provides general-purpose remote I/O expansion for most microcontroller families via the I

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 V

active. An additional strong pullup to V

allows fast rising edges into heavily loaded outputs. This device turns

on when an output is written high and is switched off by the negative edge of SCL. The I/Os should be high

before being used as inputs.

ORDERING INFORMATION

PACKAGE

(1)

ORDERABLE PART NUMBER TOP-SIDE MARKING

QFN – RGY Tape and reel PCF8574ARGYR PF574A

PDIP – N Tube PCF8574AN PCF8574AN

Tube PCF8574ADW

–40 ° C to 85 ° C SOIC – DW PCF8574A

Tape and reel PCF8574ADWR

TSSOP – PW Tape and reel PCF8574APWR PF574A

TVSOP – DGV Tape and reel PCF8574ADGVR PF574A

(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (24 pages)

PAGE 1
PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.
PAGE 2
PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 DESCRIPTION/ORDERING INFORMATION (CONTINUED) The PCF8574A provides an open-drain output (INT) that can be connected to the interrupt input of a microcontroller. An interrupt is generated by any rising or falling edge of the port inputs in the input mode. After time, tiv, INT is valid.
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PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 SIMPLIFIED SCHEMATIC DIAGRAM OF EACH P-PORT INPUT/OUTPUT VCC Write Pulse 100 µA Data From Shift Register D Q FF P0 to P7 CI S Power-On Reset D Q GND FF CI Read Pulse S To Interrupt Logic Data To Shift Register I2C Interface I2C communication with this device is initiated by a master sending a start condition, a high-to-low transition on the SDA I/O while the SCL input is high.
PAGE 4
PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.
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PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 Electrical Characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VCC VIK Input diode clamp voltage II = –18 mA VPOR Power-on reset voltage (2) VI = VCC or GND, IOH P port VO = GND IOHT P-port transient pullup current High during acknowledge, VOH = GND SDA VO = 0.4 V P port VO = 1 V INT VO = 0.4 V IOL 2.
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PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.
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PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 PARAMETER MEASUREMENT INFORMATION VCC RL = 1 kΩ Pn DUT CL = 10 pF to = 400 pF LOAD CIRCUIT 2 Bytes for Complete Device Programming Stop Condition (P) Start Condition (S) Bit 7 (MSB) Bit 0 LSB (R/W) Bit 6 tscl Acknowledge (A) Stop Condition (P) tsch 0.7 × VCC SCL 0.3 × VCC ticr tPHL ticf tbuf tsts tPLH tsp 0.7 × VCC SDA 0.
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PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 PARAMETER MEASUREMENT INFORMATION (continued) Acknowledge From Slave Start Condition Acknowledge From Slave R/W Slave Address S Data From Port 0 1 1 1 A2 A1 A0 1 A 1 2 3 4 A 5 6 7 8 Data From Port Data 1 A Data 3 1 A tir tir B B INT A tiv tsps A Data Into Port Data 1 Data 2 0.7 × VCC INT 0.7 × VCC SCL 0.3 × VCC Data 3 R/W A tiv 0.3 × VCC tir 0.7 × VCC Pn 0.
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PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 PARAMETER MEASUREMENT INFORMATION (continued) VCC VCC RL = 1 kΩ DUT RL = 4.7 kΩ SDA DUT INT CL = 10 pF to 400 pF GND CL = 10 pF to 400 pF GND SDA LOAD CONFIGURATION INTERRUPT LOAD CONFIGURATION Figure 4.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device PCF8574ADGVR Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TVSOP DGV 20 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 PCF8574ADWR SOIC DW 16 2000 330.0 16.4 10.75 10.7 2.7 12.0 16.0 Q1 PCF8574APWR TSSOP PW 20 2000 330.0 16.4 6.95 7.1 1.6 8.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) PCF8574ADGVR TVSOP DGV 20 2000 367.0 367.0 35.0 PCF8574ADWR SOIC DW 16 2000 366.0 364.0 50.0 PCF8574APWR TSSOP PW 20 2000 367.0 367.0 38.0 PCF8574ARGYR VQFN RGY 20 3000 367.0 367.0 35.
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MECHANICAL DATA MPDS006C – FEBRUARY 1996 – REVISED AUGUST 2000 DGV (R-PDSO-G**) PLASTIC SMALL-OUTLINE 24 PINS SHOWN 0,40 0,23 0,13 24 13 0,07 M 0,16 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 0°– 8° 1 0,75 0,50 12 A Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,08 14 16 20 24 38 48 56 A MAX 3,70 3,70 5,10 5,10 7,90 9,80 11,40 A MIN 3,50 3,50 4,90 4,90 7,70 9,60 11,20 DIM 4073251/E 08/00 NOTES: A. B. C. D. All linear dimensions are in millimeters.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.