HT6542B View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT6542B

Keyboard Controller with PS/2

Holtek Semiconductor 

HT6542B

Keyboard Controller with PS/2

Features

• High reliability MOS technology

• 8042-type host interface

• 6MHz-12MHz operating frequency

• Communicates with keyboard directly

• Provides enhanced Gate A20 switching

General Description

The HT6542B is a keyboard controller devel-

oped by Holtek with a 4-bit microprocessor. It is

pin-to-pin compatible with Intel 8042 keyboard

controller used in IBM PC’s. PC manufacturers

need not modify any printed wiring layout

when using the HT6542B in lieu of the Intel

• Support PS/2 compatible mouse

• Auto-detect AT and PS/2 motherboard

• Support 40 pin DIP and 44 pin PLCC pack-

ages

8042 based keyboard controller. Furthermore,

the HT6542B can support a system clock speed

of up to 12MHz. The HT6542B can detect the

motherboard type automatically, therefore it

can be employed on both of AT and PS/2 moth-

erboard.

Pin Assignment

40 Pin DIP package

44 Pin PLCC package

1

30th Nov ’95

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