HT82K628A Datasheet, PDF (1/18 Pages) Holtek Semiconductor Inc – Windows 2000 Keyboard Encoder

HT82K628A
Windows 2000 PS/2 Keyboard Encoder
Features
· Design for Windows 95/98/NT/2000/XP
· Supports Windows^TM keys
· Supports PC/AT and PS/2 code set 1, 2, 3
· Supports Japanese , Korean , Brazilian and
European
· RC oscillator
· Phantom key detection
· Low power consumption
· 101/102/104/105/107/109 keys or other special ap-
plication keyboard encoder
· 8 external hot keys
· Supports Mini-keyboard and Internet/Multimedia
keyboard
· WINDOWS is a registered trademark of Microsoft
corporation
· 40-pin DIP package
General Description
The HT82K628A is a keyboard encoder designed for
IBM PC/AT, IBM PS/2 and all compatible machines.
The HT82K628A accepts keyboard inputs and provides
a 16-character first-in-first-out buffer in which data is
stored.
An inexpensive RC oscillator can be used for the system
clock. Simple implementation of this device is an advan-
tage for high performance and low cost keyboard appli-
cations.
Pin Assignment
R5 1
40
R4 2
39
C3 3
38
C2 4
37
C1 5
36
C0 6
35
R3 7
34
R2 8
33
R1 9
32
R 0 10
31
R 19 11
30
R 18 12
29
R 17 13
28
R 16 14
27
V S S 15
26
S C R O LL 16
25
NUM
17
24
D A TA 18
23
C LO C K 19
22
F n S e le c t 2 0
21
H T82K 628A
4 0 D IP -A
R6
R7
C4
C5
C6
C7
NC
O SC1
VDD
RESET
CAPS
R8
R9
R 10
R 11
R 12
R 13
R 14
R 15
M a c r o K e y s e le c t
Rev. 1.60
1
April 16, 2004