HT6542B datasheet(3/7 Pages) HOLTEK

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Pin No.

(DIP)

Pin No.

(PLCC)

Name

I/O

Pin Descriptions

Host-interface write signal, active low

12~19

14~21

D0~D7

I/O

Host interface data bus. An 8-bit bi-directional port

for data transfers between the host CPU and the

HT6542B

VSS

—

Circuit ground

Host-reset control signal output

A20

Gate A20 control signal output

P22/MSDO

I/O

Ge ne ral purpose input/output pin for AT

motherboard.

Mouse data output pin for PS/2 motherboard

P23/MSCO

I/O

Ge ne ral purpose input/output pin for AT

motherboard.

Mouse clock output pin for PS/2 motherboard

TEST

Test input pin, for IC test only. Connected to VCC in

applications

P10/KBDI

I/O

Ge ne ral purpose input/output pin for AT

motherboard.

Keyboard data input pin for PS/2 motherboard

P11/MSDI

I/O

Ge ne ral purpose input/output pin for AT

motherboard.

Mouse data input pin for PS/2 motherboard

29~33

32~33

35~37

P12~P16

I/O General purpose input/output pins

KBD-INH

Keyboard inhibit input. When low, keyboard is

inhibited. When high, keyboard transmission is

enabled.

KB-OBFO

Keyboard output buffer full interrupt for AT and

PS/2 mother board (active high)

MS-OBFO

Output low for AT mothboard.

Mouse output buffer full interrupt for PS/2 mother

board (active high).

KBCO

Keyboard clock output pin for AT and PS/2

motherboard.

KBDO

Keyboard data output pin for AT and PS/2

motherboard.

KBDI/MSCI

Keyboard data input pin for AT motherboard

Mouse clock input pin for PS/2 motherboard

VDD

—

Positive power supply

Absolute Maximum Ratings

Supply Voltage ............................ –0.3V to 5.5V

Input Voltage .................. VSS–0.3V to VDD+0.3

Storage Temperature ............... –50

°C to 125°C

Operating Temperature ................. 0

°C to 70°C

HT6542B

30th Nov ’95

HT6542B Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

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