HT82K28A

Win98 Keyboard Encoder

Pin Assignment

Rev. 1.30

1

June 27, 2002

General Description

The HT82K28A is a keyboard encoder especially de-

signed for IBM PC/AT, IBM PS/2 and all compatible ma-

chines.

The HT82K28A accepts keyboard inputs and contains a

16-character first-in-first-out buffer in which data is

stored. An inexpensive RC oscillator can be used for the

system clock. The device offers the advantage of simple

implementation in high performance and low cost key-

board applications.

Features

ACPI functions

keyboards

H T 8 2 K 2 8 A

4 0 D I P - A

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

O S C 1

V S S

V D D

V S S

I O 0

I O 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

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