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PCA8574/74A

Remote 8-bit I/O expander for I

2

C-bus with interrupt

Rev. 02 鈥?14 May 2007

Product data sheet

1. General description

The PCA8574/74A provide general purpose remote I/O expansion for most

microcontroller families via the two-line bidirectional I

2

C-bus (serial clock (SCL), serial

data (SDA)).

The devices consist of an 8-bit quasi-bidirectional port and an I

2

C-bus interface. The

PCA8574/74A have low current consumption and include latched outputs with 25 mA high

current drive capability for directly driving LEDs.

The PCA8574/74A also possess an interrupt line (INT) that can be connected to the

interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote

I/O can inform the microcontroller if there is incoming data on its ports without having to

communicate via the I

2

C-bus.

The internal Power-On Reset (POR) initializes the I/Os as inputs.

2. Features

I

I

I

I

I

I

I

I

I

I

I

400 kHz I

2

C-bus interface

2.3 V to 5.5 V operation with 5.5 V tolerant I/Os

8-bit remote I/O pins that default to inputs at power-up

Latched outputs with 25 mA sink capability for directly driving LEDs

Total package sink capability of 200 mA

Active LOW open-drain interrupt output

8 programmable slave addresses using 3 address pins

Readable device ID (manufacturer, device type, and revision)

Low standby current (10

碌A(chǔ)

max.)

鈭?0 擄C

to +85

擄C

operation

ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per

JESD22-A115, and 1000 V CDM per JESD22-C101

I

Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA

I

Packages offered: DIP16, SO16, TSSOP16, SSOP20

3. Applications

I

I

I

I

I

LED signs and displays

Servers

Industrial control

Medical equipment

PLCs

next

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