HT82K28A Datasheet, PDF (1/20 Pages) Holtek Semiconductor Inc – Win98 Keyboard Encoder

HT82K28A
Win98 Keyboard Encoder
Features
· 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
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
· 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
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 SC1
VSS
VDD
VSS
IO 0
IO 1
C2
C3
C4
C5
C6
C7
R 10
R 11
R 12
R0
R1
R2
R3
R4
1
40
2
39
3
38
4
37
5
36
6
35
7
34
8
33
9
32
10
31
11
30
12
29
13
28
14
27
15
26
16
25
17
24
18
23
19
22
20
21
H T82K 28A
4 0 D IP
C1
C0
D ATA
C LO C K
R 18
R 17
NC
R 16
CAP
NUM
SCRL
R9
R8
R 15
R 14
NC
R 13
R7
R6
R5
1
February 16, 2000