PCF8574 datasheet(5/42 Pages) TI2

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5.5 Electrical Characteristics

over recommended operating free-air temperature range (unless otherwise noted)

TEST CONDITIONS

VCC

MIN TYP(1)

MAX

UNIT

VIK

Input diode clamp voltage

II = –18 mA

2.5 V to 6 V

–1.2

VPOR

Power-on reset voltage

VI = VCC or GND,

IO = 0

6 V

1.3

2.4

IOH

P port

VO = GND

2.5 V to 6 V

-310

-30

μA

IOHT

P port transient pullup current High during acknowledge, VOH = GND

2.5 V

–1

IOL

SDA

VO = 0.4 V

2.5 V to 6 V

P port

VO = 1 V

5 V

INT

VO = 0.4 V

2.5 V to 6 V

1.6

SCL, SDA

VI = VCC or GND

2.5 V to 6 V

±5

μA

INT

±5

A0, A1, A2

±5

IIHL

P port

-250mV < Vi < GND

2.5 V to 6 V

±400

μA

ICC

Operating mode

VI = VCC or GND,

IO = 0, fSCL = 100 kHz

6 V

100

μA

Standby mode

VI = VCC or GND,

IO = 0

2.5

SCL

VI = VCC or GND

2.5 V to 6 V

1.5

Cio

SDA

VIO = VCC or GND

2.5 V to 6 V

P port

(1)

All typical values are at VCC = 5 V, TA = 25°C.

5.6 I2C Interface Timing Requirements

over recommended operating free-air temperature range (unless otherwise noted)

MIN

MAX

UNIT

fscl

I2C clock frequency

100

kHz

tsch

I2C clock high time

μs

tscl

I2C clock low time

4.7

μs

tsp

I2C spike time

tsds

I2C serial data setup time

250

tsdh

I2C serial data hold time

ticr

I2C input rise time

μs

ticf

I2C input fall time

0.3

μs

tocf

I2C output fall time (10-pF to 400-pF bus)

300

tbuf

I2C bus free time between stop and start

4.7

μs

tsts

I2C start or repeated start condition setup

4.7

μs

tsth

I2C start or repeated start condition hold

μs

tsps

I2C stop condition setup

μs

tvd

Valid data time

SCL low to SDA output valid

3.4

μs

I2C bus capacitive load

400

www.ti.com

PCF8574

SCPS068K – JULY 2001 – REVISED SEPTEMBER 2024

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