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8574A

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

NXP Semiconductors. 

NXP Semiconductors

PCF8574; PCF8574A

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

protocol

START

condition

(S)

bit 7

MSB

(A7)

bit 6

(A6)

bit 0

(R/W)

acknowledge

(A)

STOP

condition

(P)

tSU;STA

SCL

tBUF

SDA

tLOW tHIGH

1 / fSCL

tr

tf

tHD;STA

tSU;DAT tHD;DAT

Rise and fall times refer to VIL and VIH.

Fig 17. I2C-bus timing diagram

0.7 × VDD

0.3 × VDD

tVD;DAT

tVD;ACK tSU;STO

0.7 × VDD

0.3 × VDD

002aab175

PCF8574_PCF8574A

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 5 — 27 May 2013

© NXP B.V. 2013. All rights reserved.

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