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TECHNICAL DATA

KKF8574

GENERAL DESCRIPTION

The

KKF8574

is a silicon CMOS circuit. It provides general purpose remote I/O expansion for most

microcontroller families via the two-line bidirectional bus (I

2

C).

The device consists of an 8-bit quasi-bidirectional Port and an I

2

C interface. The

KKF8574

has a low current

consumption and includes latched outputs with high current drive capability for directly driving LEDs. It

also possesses an interrupt line (INT) which 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. This means that the

KKF8574

can remain a

simple slave device.

FEATURES

銆€

Operating supply voltage 2.5 to 6 V

銆€

Low standby current consumption of 10

銆€A

maximum

銆€

I

2

C to parallel port expander

銆€

Open-drain interrupt output

銆€

8-bit remote I/O Port for the I

2

C-bus

銆€

Compatible with most microcontrollers

銆€

Latched outputs with high current drive capability for

directly driving LEDs

銆€

Address by 3 hardware address pins for use of up to 8

devices (up to 16 with

KKF8574A)

銆€

DIP16, space-saving SO16 or SSOP20 package.

BLOCK DIAGRAM

1

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