HT6542B Просмотр технического описания (PDF) - Holtek Semiconductor
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HT6542B Datasheet PDF : 7 Pages
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HT6542B
Pin No.
(DIP)
Pin No.
(PLCC)
10
11
12~19
14~21
20
22
21
24
22
25
23
26
24
27
26
28
27
30
28
29~33
34
31
32~33
35~37
38
35
39
36
40
37
41
38
42
39
43
40
44
Pin
Name
WR
D0~D7
VSS
RC
A20
P22/MSDO
P23/MSCO
TEST
P10/KBDI
P11/MSDI
I/O
Pin Descriptions
I Host-interface write signal, active low
Host interface data bus. An 8-bit bi-directional port
I/O for data transfers between the host CPU and the
HT6542B
— Circuit ground
O Host-reset control signal output
O Gate A20 control signal output
General purpose input/output pin for AT
I/O motherboard.
Mouse data output pin for PS/2 motherboard
General purpose input/output pin for AT
I/O motherboard.
Mouse clock output pin for PS/2 motherboard
I
Test input pin, for IC test only. Connected to VCC in
applications
General purpose input/output pin for AT
I/O motherboard.
Keyboard data input pin for PS/2 motherboard
General purpose input/output pin for AT
I/O motherboard.
Mouse data input pin for PS/2 motherboard
P12~P16
I/O General purpose input/output pins
KBD-INH
KB-OBFO
MS-OBFO
KBCO
KBDO
KBDI/MSCI
VDD
Keyboard inhibit input. When low, keyboard is
I inhibited. When high, keyboard transmission is
enabled.
O
Keyboard output buffer full interrupt for AT and
PS/2 mother board (active high)
Output low for AT mothboard.
O Mouse output buffer full interrupt for PS/2 mother
board (active high).
O
Keyboard clock output pin for AT and PS/2
motherboard.
O
Keyboard data output pin for AT and PS/2
motherboard.
I
Keyboard data input pin for AT motherboard
Mouse clock input pin for PS/2 motherboard
— 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
3
30th Nov ’95
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