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8574A

Remote 8-bit I/O expander for I2C-BUS

Philips Electronics 

Philips Semiconductors

Remote 8-bit I/O expander for I2C-bus

Product specification

PCF8574

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

I/Os

VIL

VIH

IIHL(max)

LOW level input voltage

HIGH level input voltage

maximum allowed input

current through protection

diode

VI ≥ VDD or VI ≤ VSS

−0.5

−

0.7VDD

−

−

−

+0.3VDD V

VDD + 0.5 V

±400

µA

IOL

LOW level output current

VOL = 1 V; VDD = 5 V

10

IOH

HIGH level output current VOH = VSS

30

IOHt

transient pull-up current

HIGH during acknowledge −

(see Fig.15); VOH = VSS;

VDD = 2.5 V

Ci

input capacitance

−

Co

output capacitance

−

25

−

mA

−

300

µA

−1

−

mA

−

10

pF

−

10

pF

Port timing; CL ≤ 100 pF (see Figs 11 and 12)

tpv

output data valid

tsu

input data set-up time

th

input data hold time

−

−

4

µs

0

−

−

µs

4

−

−

µs

Interrupt INT (see Fig.14)

IOL

LOW level output current VOL = 0.4 V

IL

leakage current

VI = VDD or VSS

1.6

−

−

mA

−1

−

+1

µA

TIMING; CL ≤ 100 pF

tiv

input data valid time

tir

reset delay time

−

−

4

µs

−

−

4

µs

Select inputs A0 to A2

VIL

LOW level input voltage

VIH

HIGH level input voltage

ILI

input leakage current

pin at VDD or VSS

−0.5

−

0.7VDD

−

−250

−

+0.3VDD V

VDD + 0.5 V

+250

nA

Note

1. The Power-on reset circuit resets the I2C-bus logic at VDD < VPOR and sets all I/Os to logic 1 (with current source to

VDD).

2002 Nov 22

15

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