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  Holtek Semiconductor Electronic Components Datasheet  

HT6542B Datasheet

Keyboard Controller with PS/2

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HT6542B pdf
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


  Holtek Semiconductor Electronic Components Datasheet  

HT6542B Datasheet

Keyboard Controller with PS/2

No Preview Available !

HT6542B pdf
Block Diagram
HT6542B
Pin Description
Pin No.
(DIP)
Pin No.
(PLCC)
12
2,3 3,4
45
Pin
Name
I/O
Pin Descriptions
KBCI
I Keyboard clock input pin
OSCI,OSCO
I
System clock input pin, to generate internal
oscillator signal
RES
I
Low level to reset HT6542B. After RES goes to high
level HT6542B needs 10ms to initial internal circuit
5,7,11,25
6
8
1,6,8,12,13,
23,29,34
7
9
NC
CS
RD
9 10
A0
— No connection
I Host-interface chip select, active low
I Host-interface read signal, active low
Host-interface address select input. When high, it
I selects the command/status registers; when low it
selects the data register
2 30th Nov ’95


Part Number HT6542B
Description Keyboard Controller with PS/2
Maker Holtek Semiconductor Inc
Total Page 7 Pages
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1 HT6542B Keyboard Controller with PS/2 Holtek Semiconductor Inc
Holtek Semiconductor Inc
HT6542B pdf






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