PCF8574 datasheet(7/26 Pages) TI

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Electrical Characteristics

2C Interface Timing Requirements

PCF8574

www.ti.com ............................................................................................................................................................... SCPS068G – JULY 2001 – REVISED MAY 2008

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

PARAMETER

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(2)

VI = VCC or GND,

IO = 0

6 V

1.3

2.4

IOH

P port

VO = GND

2.5 V to 6 V

300

µA

IOHT

P-port transient pullup current

High during acknowledge, VOH = GND

2.5 V

–1

SDA

VO = 0.4 V

2.5 V to 6 V

IOL

P port

VO = 1 V

5 V

INT

VO = 0.4 V

2.5 V to 6 V

1.6

SCL, SDA

±5

INT

VI = VCC or GND

2.5 V to 6 V

±5

µA

A0, A1, A2

±5

IIHL

P port

VI ≥ VCC or VI ≤GND

2.5 V to 6 V

±400

µA

Operating mode

VI = VCC or GND,

IO = 0,

fSCL = 100 kHz

100

ICC

6 V

µA

Standby mode

VI = VCC or GND,

IO = 0

2.5

SCL

VI = VCC or GND

2.5 V to 6 V

1.5

SDA

Cio

VIO = VCC or GND

2.5 V to 6 V

P port

(1)

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

(2)

The power-on reset circuit resets the I2C-bus logic with VCC < VPOR and sets all I/Os to logic high (with current source to VCC).

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 3)

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

100

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

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