PCF8574

SCPS068C - JULY 2001 − REVISED JANUARY 2004

5

POST OFFICE BOX 655303

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP†

MAX

UNIT

VIK

Input diode clamp voltage

II = −18 mA

2.5 V to 6 V

−1.2

V

VPOR

Power-on reset voltage‡

VI = VCC or GND, IO = 0

6 V

1.3

2.4

V

IOH

P port

VO = GND

2.5 V to 6 V

30

300

µA

IOHT

P-port transient pullup current

High during acknowledge VOH = GND

2.5 V

−1

mA

SDA

VO = 0.4 V

2.5 V to 6 V

3

IOL

P port

VO = 1 V

5 V

10

25

mA

IOL

INT

VO = 0.4 V

2.5 V to 6 V

1.6

mA

SCL, SDA

±5

II

INT

VI = VCC or GND

2.5 V to 6 V

±5

µA

II

A0, A1, A2

VI = VCC or GND

2.5 V to 6 V

±5

µA

IIHL

P port

VI ≥ VCC or VI ≤ GND

2.5 V to 6 V

±400

µA

ICC

Operating mode

VI = VCC or GND, IO = 0, fSCL = 100 kHz

6 V

40

100

A

ICC

Standby mode

VI = VCC or GND, IO = 0

6 V

2.5

10

µA

Ci

SCL

VI = VCC or GND

2.5 V to 6 V

1.5

7

pF

Cio

SDA

VIO = VCC or GND

2.5 V to 6 V

3

7

pF

Cio

P port

VIO = VCC or GND

2.5 V to 6 V

4

10

pF

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

‡ 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).

otherwise noted) (see Figure 1)

MIN

MAX

UNIT

fscl

I2C clock frequency

100

kHz

tsch

I2C clock high time

4

µs

tscl

I2C clock low time

4.7

µs

tsp

I2C spike time

100

ns

tsds

I2C serial data setup time

250

ns

tsdh

I2C serial data hold time

0

900

ns

ticr

I2C input rise time

1

µs

ticf

I2C input fall time

0.3

µs

tocf

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

300

ns

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

4

µs

tsps

I2C stop-condition setup

4

µs

tvd

Valid data time

SCL low to SDA output valid

3.4

µs

Cb

I2C-bus capacitive load

400

pF