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• 1
• 2
• 3
• 4
• 5
• 6
• 7
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• 9
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2

3

41

38

2x4.7K

RST

VCC

NC

2x2K

33

SUGGESTED INTERFACING FOR K25C81-FB (44-PIN QFP PACKAGE)

OSCI

ODCO

VSS

37

36

17

7

+

VCC

10uF

R6

100K

VCC

R1 R2 R3 R4

C6

1

2

3

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

1

VCC

U1

1

VCC

C1

TC54VC4502ECB

.1uF

JP1

JP1

TELCOM

JUPERS SETTING

S

1-2:

2-3

PC/ T

X

PC/A

T

EXTERNAL_KBD_PS2DATA

EKD

EKC

EKC1

KC

KD

5

35

4

3

6

EXTERNAL_KBD_PS2CLOCK

HOST_PS2DATA

C2

C5

4x47pF

NC

NC

NC

NC

40

39

16

22

VCC

42

IRQ

VX

RP

43

2

R7

R6

R5

R4

R3

R2

R1

R0

34

1

32

31

30

29

28

27

K25C81-FB

QFP44

HOST_PS2CLOCK

C3

C4

U2

C17

C16

C15

C14

C13

C12

C11

C10

C9

C8

C7

C6

C5

C4

C3

C2

C1

C0

44

7

18

19

20

21

23

24.

25

26

15

14

13

12

11

10

9

8

C17

C16

C15

C14

C13

C12

C11

C10

C9

C8

C7

C6

C5

C4

C3

C2

C1

C0

R7

R6

R5

R4

R3

R2

R1

R0

VCC

RP1

NET_15K

R5

1M

Y1

4.00MHz

AVX

PBRC4.00BR

www.semtech.com

(c)1994-2001 USAR SYSTEMS, Inc.

Application Circuit for K25C81-FB

Document Number

K25C81FB.sch

Rev

.6

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