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HT6542B Datasheet(PDF) 2 Page - Holtek Semiconductor Inc

Part # HT6542B
Description  Keyboard Controller with PS/2
PDF  7 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT6542B Datasheet(HTML) 2 Page - Holtek Semiconductor Inc

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Block Diagram
Pin Description
Pin No.
(DIP)
Pin No.
(PLCC)
Pin
Name
I/O
Pin Descriptions
1
2
KBCI
I
Keyboard clock input pin
2,3
3,4
OSCI,OSCO
I
System clock input pin, to generate internal
oscillator signal
45
RES
I
Low level to reset HT6542B. After RES goes to high
level HT6542B needs 10ms to initial internal circuit
5,7,11,25
1,6,8,12,13,
23,29,34
NC
—
No connection
67
CS
I
Host-interface chip select, active low
89
RD
I
Host-interface read signal, active low
910
A0
I
Host-interface address select input. When high, it
selects the command/status registers; when low it
selects the data register
HT6542B
2
30th Nov ’95



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