PCF8574TS datasheet(16/24 Pages) PHILIPS

16 / 24 page

2002 Nov 22

Philips Semiconductors

Product speciﬁcation

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

PCF8574

11 I2C-BUS TIMING CHARACTERISTICS

Note

1. All the timing values are valid within the operating supply voltage and ambient temperature range and refer to VIL

and VIH with an input voltage swing of VSS to VDD.

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

I2C-bus timing (see Fig.16; note 1)

fSCL

SCL clock frequency

−−

100

kHz

tSW

tolerable spike width on bus

−−

100

tBUF

bus free time

4.7

−−µs

tSU;STA

START condition set-up time

4.7

−−µs

tHD;STA

START condition hold time

4.0

−−µs

tLOW

SCL LOW time

4.7

−−µs

tHIGH

SCL HIGH time

4.0

−−µs

SCL and SDA rise time

−−

1.0

µs

SCL and SDA fall time

−−

0.3

µs

tSU;DAT

data set-up time

250

−−

tHD;DAT

data hold time

−−

tVD;DAT

SCL LOW to data out valid

−−

3.4

µs

tSU;STO

STOP condition set-up time

4.0

−−µs

Fig.16 I2C-bus timing diagram.

handbook, full pagewidth

PROTOCOL

SCL

SDA

MBD820

BIT 0

LSB

(R/W)

t HD;STA

SU;DAT

HD;DAT

VD;DAT

t SU;STO

BUF

SU;STA

LOW

t HIGH

1 / f SCL

START

CONDITION

(S)

BIT 7

MSB

(A7)

BIT 6

(A6)

ACKNOWLEDGE

(A)

STOP

CONDITION

(P)

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