PCA8550 datasheet(5/12 Pages) TI

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I2C Interface Timing Requirements

Switching Characteristics

PCA8550

NONVOLATILE 5-BIT REGISTER

WITH I2C INTERFACE

SCPS050C – MARCH 1999 – REVISED MAY 2005

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1)

VCC = 3.3 V ± 0.3 V

UNIT

MIN

MAX

fscl

I2C clock frequency

400

kHz

tsch

I2C clock high time

600

tscl

I2C clock low time

1.3

µs

tsp

I2C spike time

tsds

I2C serial data setup time

100

tsdh

I2C serial data hold time

900

ticr

I2C input rise time

300

ticf

I2C input fall time

300

tocf

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

20 + 0.1 Cb(1)

250

tbuf

I2C bus free time between stop and start

1.3

µs

tsts

I2C start or repeated start condition setup

600

tsth

I2C start or repeated start condition hold

600

tsps

I2C stop condition setup

600

Cb(1)

I2C bus capacitive load

400

(1)

Cb = capacitance of one bus line in pF

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 2)

VCC = 3.3 V

FROM

± 0.3 V

PARAMETER

UNIT

(INPUT)

(OUTPUT)

MIN

MAX

tmpd Mux input to output propagation delay

MUX IN

MUX OUT

tsov MUX SELECT to output valid

MUX SELECT

Output valid

tovn OVERRIDE to NON-MUXED OUT output delay

OVERRIDE

NON-MUXED OUT

tovm OVERRIDE to MUX OUT output delay

OVERRIDE

MUX OUT

Falling edge of first valid data byte

tsu

Setup time

acknowledge on the SCL input

Falling edge of first valid data byte

Hold time

120

acknowledge on the SCL input

Output rise time

ns/V

Output fall time

ns/V

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