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SUGGESTED INTERFACING FOR K25C81-FN (44-PIN PLCC PACKAGE)

VCC

U1

1

VCC

2

C1

3

TC54VC4502ECB

TELCOM

.1uF

+

JP1

C6

10uF

VCC

R6

1

2

3

JUPERS SETTINGS

JP1

1-2:

2-3

PC/XT

PC/AT

VCC

R1 R2 R3 R4

2x4.7K

2x2K

44

VCC

RST

NC

38

100K

5

12

24

25

26

27

28

29

30

31

21

20

19

17

16

15

14

13

18

40

39

6

37

36

35

34

33

32

C17

C16

C15

C14

C13

C12

C11

C10

C9

C8

C7

C6

C5

C4

C3

C2

C1

C0

1

EXTERNAL_KBD_PS2DATA

EXTERNAL_KBD_PS2CLOCK

11

10

41

9

8

EKD

EKC

EKC1

KC

KD

HOST_PS2DATA

HOST_PS2CLOCK

C2

C3

C4

C5

4x47pF

U2

K25C81-FN

PLCC

3

23

VCC

2

4

7

IRQ

VX

RP

ODCO

OSCI

VSS

NC

NC

C17

C16

C15

C14

C13

C12

C11

C10

C9

C8

C7

C6

C5

C4

C3

C2

C1

C0

C4A

R7A

R7

R6

R5

R4

R3

R2

R1

R0

R7

R6

R5

R4

R3

R2

R1

R0

VCC

RP1

NET_15K

43

42

R5

1M

Y1

4.00MHz

AVX

PBRC4.00BR

22

(c)1994-2001 USAR SYSTEMS, Inc.

Application Circuit for K25C81-FB

.6

Document Number

K25C81FB.sch

Rev

STANDARD KEYMAP FOR K25C81

Rows (R0-R7)

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

0

1

F29

F28

Pg Dn

Home

]

(

v

w

o

p

h

i

a

b

.

, (comma)

S

T

J

K

A

B

1

2

f3

f4

f14

f13

f1

Backspace

Ins

Esc

Back-quote

!

鈥?Apostrophe) "

* Typematic Keys

2

End

PgUp

)

x

q

j

c

- (dash)

U

L

C

3

f6

f12

Rt Arrow*

Up Arrow*

@

<

n

n

3

F36

:

*

y

r

k

d

/

V

M

D

4

f5

f15

Dn Arrow*

Lft Arrow*

-

>

4

F34

F27

^

z

s

l

e

%

W

N

E

5

f7

f11

F38

R

{

?

5

F35

F30

F22

;

t

m

f

&

X

O

F

6

f8

f16

Space

Enter

}

~

n

n

6

F33

F31

F21

[

u

n

g

#

Y

P

G

7

f9

9

F19

$

\

Tab

7

F37

F32

F25

F20

F23

F18

i

0

Z

Q

H

8

f2

f10

+

=

|

Del

Columns (C0鈥揅17)

Upper case A鈥揨 correspond to Shift a鈥揝hift z

F21鈥揊30 correspond to Ctrl F1鈥揅trl F10

F11鈥揊20 correspond to Shift F1鈥揝hift F10

F31鈥?.. correspond to Alt F1鈥揂lt F10

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

6

www.semtech.com

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