HT82K28A
Win98 Keyboard Encoder
Features
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Designed for Windows 95/98/NT
Supports 3 Windows 95 Keys
Supports Power, Sleep and Wake-up Win-
dows 98 ACPI functions
Supports Japanese, Korean and Portuguese
Supports Japanese DOS/V 106-key
keyboard
Supports code set 1, for PS/2 model
30 keyboard
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Supports code set 2, for PC/AT, PS/2 model
50,60 keyboards
Supports code set 3, for PS/2 model
80 keyboard
RC oscillator
Phantom key detection
Minimal external components
Pin-compatible with Holtek HT6547E-2
40-pin DIP/DICE form
General Description
The HT82K28A is a keyboard encoder espe-
cially designed for IBM PC/AT, IBM PS/2 and
all compatible machines.
The HT82K28A accepts keyboard inputs and
contains a 16-character first-in-first-out buffer
in which data is stored. An inexpensive RC os-
cillator can be used for the system clock. The
device offers the advantage of simple imple-
mentation in high performance and low cost
keyboard applications.
Pin Assignment
O S C 1
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
V S S
V D D
V S S
IO 0
IO 1
C 2
C 3
C 4
C 5
C 6
C 7
R 1 0
R 1 1
R 1 2
R 0
R 1
R 2
R 3
R 4
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
C 1
C 0
D A T A
C L O C K
R 1 8
R 1 7
N C
R 1 6
C A P
N U M
S C R L
R 9
R 8
R 1 5
R 1 4
N C
R 1 3
R 7
R 6
R 5
H T 8 2 K 2 8 A
4 0 D IP
1
February 16, 2000