K25C81_技术文档

Fle x iCo d e r^TMK2 5 C8 1

Versatile PC/XC/AT/PS/2 Compatible

Keyboard Encoder

HID & S YS TEM MANAGEMENT P RODUCTS , KEYCODER^TMFAMILY

DESCRIPTION

FEATURES

The FlexiCoder^TMis a versatile, low-

power keyboard encoder. It offers

two bi-directional channels for

communicating with a

• Directly interfaces a PC

keyboard port

• Encodes up to 144 custom keys

on an 8 X 18 matrix

• Enables custom keypad scan

codes to remain unaffected by

the Shift States of an external

keyboard

PC/XT/AT/PS2 system, and/or any

optional keyboard-compatible

devices, such as an 83 or 101/102

standard desktop keyboard, OCR,

barcode reader, etc. The K25C81

directly interfaces a PC keyboard

port, making custom keyboard to

system communications fully

transparent.

• Buffers up to 122 keycodes

• Interfaces to 83/101/102

standard keyboard or other

8042-compatible device

• Includes jumper-selectable auto-

repeat for designated keys

• Offers two-key inhibit scanning

mode

APPLICATIONS

• Custom keyboards/keypads

• Control panels

• Automatic teller machines

• Embedded control systems

• Public Information Kiosks

• Instrumentation

• Test and Measurement equipment

• Point of Sales terminals

• Industrial Controllers

On an 8 x 18 matrix, the

FlexiCoder^TMwill scan, debounce

and encode up to 144 keys. Scan

codes corresponding to single keys

of the IBM 101 keyboard, or a

combination of these keys when

depressed with Shift, Ctrl, and Alt

keys, are generated with each key

press. Custom keypad input is not

effected by the Shift States of an

external keyboard.

• Medical Instruments

PIN ASSIGNMENTS

1

2

3

4

5

6

7

8

9

40 Vcc

39 OSCI

38 OSCO

37 EKC1

36 R7

_RESET

_IRQ

VX

C17

R6

Users can conveniently define key

assignments on the matrix as single

or repeating actions. All keys must

be released between key strokes or

scanning is suspended. The

RP

35 NC

34 R5

1

6

40

KD

NC

R6

1

39

R7

NC

R5

R4

R3

7

RP

KD

KC

EKC

EKD

R5

RP

KD

KC

33 R4

R4

EKC

32 R3

R3

DIP

R2

EKC

EKD

C16

C0

EKD 10

C16 11

C0 12

C1 13

C2 14

C3 15

C4 16

C5 17

C6 18

C7 19

Vss 20

31 R2

34 R2

R1

C16 12

C0

P LCC

R1

QFP

30 R1

R0

C8

C9

C10

C1

C2

C3

C4

C8

C9

C10

C11

encoder can buffer up to 122

29 R0

C1

28 C8

27 C9

26 C10

25 C11

keycodes, and control inputs and

outputs are provided for interfacing

with contact keyboards.

29

28

C2

17

18

23

C3

C12

24

The FlexiCoder^TMis ideal for use

with either BIOS-compatible chip

sets or single-board computers for

PC systems requiring a custom

keyboard / keypad as an alternate

or additional input device. Boards

and evaluation kits are immediately

obtainable and ready to connect.

23 C13

22 C14

21 C15

FlexiCoder^TMis a trademark of Semtech Corp. All

other trademarks belong to their respective

companies.

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

1

ORDERING CODE

P a c k a g e o p t io n s

40-pin, Plastic DIP

44-pin, Plastic PLCC

44-pin, Plastic QFP

P it c h In m m ’s

2.54 mm

1.27 mm

TA = -4 0 °C t o +8 5 °C

K25C81-XX-P

K25C81-XX-FN

0.8 mm

K25C81-XX-FB

FUNCTIONAL DIAGRAM

Ke yb o a rd En c o d e r

Data Buffer

R0-R7

Row Data Inputs

8

Interrupt Control

EKC1

C0-C17

Column Select Ouputs

18

PC

KC

KD

Communication

Channel

RP

Mode Control

8042 Emulation

EKC

EKD

(Standard Keyboard)

Communication Channel

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

2

FUNCTIONAL DESCRIPTION

PIN DEFINITIONS

The FlexiCoder^TMconsists of six

major sections (see functional

diagram, previous page). These

are the Keyboard Encoder, the

Mode Control Unit, the PC

Communication Channel, the 8042

Emulation Channel, the Interrupt

Control Unit and the Data Buffer.

These sections communicate with

each other and operate

Mn e m o n ic DIP

P LCC

44

22

43

42

QFP

38

17

37

36

TYP E

I

O

I

Na m e a n d Fu n c t io n

P o w e r S u p p ly: +5V

Gro u n d

Os c ila t o r In p u t

Os c ila t o r Ou t p u t

Re s e t : apply 0 V to provide orderly

start-up.

Must be tied to Vcc

Vcc

Vss

OSCI

OSCO

_RESET

40

20

39

38

1

41

_IRQ

VX

RP

2

3

6

2

4

7

42

43

2

I

Tie to Vcc.

Ro llo ve r Mo d e S e le c t io n : tie to

Vcc to select N-Key Rollover. Tie to

Ground to select Two-Key Inhibit

Mode.

Ke yb o a rd Clo c k : connects to PC’s

keyboard port Clock Line.

Ke yb o a rd Da t a : connects to PC’s

keyboard port Data Line.

Ex t e rn a l Ke yb o a rd Da t a :

connects to external keyboard Data

Line.

Ex t e rn a l Ke yb o a rd Clo c k :

connects to external keyboard Clock

Line.

Ex t e rn a l Ke yb o a rd Clo c k 2 :

connects to external keyboard Clock

Line and is used to generate an

interrupt for every Clock Line transition.

This signal must be inverted for PC/XT

keyboards.

concurrently.

KC

8

9

4

3

6

I/O

The controller continuously scans a

keyboard organized as an 8 row by

18 column matrix, for a maximum of

144 keys. Smaller-size keyboards

can be connected provided that all

unused row pins are connected to

Vcc. The microcontroller selects

one of the 18 column lines (C0-C17)

every 512 µS and then reads the

row data lines (R0-R7).

KD

7

8

EKD

10

11

EKC

9

10

41

5

I/O

I

EKC1

37

35

A key closure is detected as a zero

in the corresponding position of the

matrix. A complete scan cycle for

the entire keyboard takes approxi-

mately 9.2 mS. Each key press is

debounced for a period of 20 mS.

Once the key is verified, the

corresponding key code(s) are

loaded into the transmit buffer of

the PC Keyboard Communication

Channel.

C0-C7

12-19

3-17

18

19-21

31-24

12

8-15

O

Co lu m n S e le c t Ou t p u t s : select

one of columns.

C8-C15

C16

28-21

11

26-18

7

44

O

I/O

C17

4

5

Ke yb o a rd t yp e s e le c t io n : this pin

is used both as outputs for column

select and as input for standard

keyboard-type selection.

R0-R5

R6

29-34

5

32-37

6

39

38, 3

18, 23

40

27-32

1

34

16, 33

22, 39

40

I

-

Ro w d a t a in p u t s

R7

36

NC

35

No Co n n e c t s : these pins are

unused.

No t e : An underscore before a pin mnemonic denotes an active low signal.

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

3

REPEAT KEYS

FUNCTIONAL DESCRIPTION, (CON’T)

Switch Matrix Encoding

In custom masks, each key can be

defined individually to be either

Typematic or Single-Touch Action.

In the standard mask, all keys are

defined to be Single-Touch Action,

except the Arrow Keys. Pin RP

controls the repeat action of keys

that are defined to be Typematic.

Each matrix location is programmed to represent either a single key or a

combination of keys of the IBM-standard 101/102 keyboard.

Scan Code Table Sets

The FlexiCoder^TMsupports two scan code table sets. Scan Code Sets 1 and

2 are the default sets for PC/XT and AT/PS/2 systems respectively. For

more information, refer to the IBM Technical Reference Manual. Custom

scan code tables, including macros, are also available. Operating modes

are defined by the logic level of the relevant mode pins in the Mode Control

Unit.

Repeat Mode

RP

L

No repeat action

Repeat action

H

Ta b le 1 : Typematic Action Control

SPECIAL HANDLING, (CON’T)

Scan Matrix Data Integrity

The Typematic rate can be

controlled by issuing the

appropriate commands from the

system.

The FlexiCoder^TMmaintains the integrity of the codes corresponding to the

scanned matrix locations, independently of the Shift Status of the external

keyboard or the system. For example, if a key has been defined on the

matrix to send code corresponding to lower case letter “a”, it will still send

the scan code for “a” even if the Shift Key has been pressed or the Caps

Lock has been set by the external keyboard. This is accomplished by

internally maintaining a set of flags to monitor the Shift Status of the external

keyboard and the system. If, for instance, the lower case key “a” is found to

be pressed and Caps Lock is set, the codes sent will be as follows:

SPECIAL HANDLING

External Keyboard Connection

If an external keyboard was not

connected during power-on and

then connected at a later time, the

controller will proceed with the

normal reset routine in order to

initialize the external keyboard

properly. Thereafter, the

1. Caps Lock Make Code

2. Caps Lock Break (this will reset the Caps Lock status of the system)

FlexiCoder^TMchecks for the

3. “a” Make Code

4. “a” Break Code

5. Lock Make Code

presence of an external keyboard

every 2 seconds. After

communication has been

established, the controller continues

checking for the external

keyboard’s presence. Should the

external keyboard be removed at a

later time, the K25C81 detects the

disconnection and will reinitiate the

reset sequence upon reconnection.

This feature allows the user to

connect and disconnect an external

keyboard at any time without

resetting the system.

6. Caps Lock Break Code (this will restore the Caps Lock status of the

system)

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

4

EXT. KBD COMMUNICATION

MODE CONTROL

The FlexiCoder^TMimplements all the

standard functions of

These commands are supported in

the AT/PS/2 protocol and can be

sent to the keyboard at any time.

Mode 1 accepts only the ‘reset’

command. Commands shown in

italics do not affect the operation of

the K25C81. Nevertheless, they

are acknowledged and relayed to

the external keyboard, if an

The external keyboard

communication port of the

FlexiCoder^TMfully emulates a

standard 8042, available to an

83/101/102 external keyboard or

other compatible device.

communication with a BIOS-

compatible PC/XT or AT/PS/2 host

system. Two lines, KC and KD,

provide bi-directional clock and

data signals according to the

protocol (PC or AT) selected. In

addition, the K25C81 supports

commands from and to the system,

as described in the IBM Technical

Reference Manuals. The following

table shows the commands that the

system may send and their value in

hex.

Communication with an external

keyboard is accomplished via EKC

and EKD, Clock and Data lines

respectively. A third pin, EKC1

which connects to the Clock Line,

interrupts the controller whenever

an external keyboard initiates a

communication.

external standard keyboard is

present.

The following table shows the

commands that the keyboard may

send to the system.

When power is first applied, the

controller proceeds with the

Command

Hex Value

ED

Command

Hex Value

00*

standard reset sequence with the

external keyboard. Data and

commands coming from the

external keyboard are buffered in

the controller’s FIFO, along with

data from the scanned matrix, and

then presented to the system as if

originating from a single source.

Commands and data from the

system, after being acknowledged,

are then transmitted to the external

keyboard.

Set/Reset Status

Indicators

Key Detection

Error/Overrun

Echo

EE

EF

F0

Keyboard ID

83AB

AA

FC

Invalid Command

BAT Completion Code

BAT Failure Code

Echo

Select Alternate

Scan Codes

EE

Invalid Command

Read ID

F1

F2

F3

Acknowledge (Ack)

Resend

FA

FE

Set Typematic

Rate/Delay

Key Detection

Error/Overrun

FF*

Enable

F4

F5

F6

*Scan Code Set 2

Ta b le 3 : Keyboard Commands to the

Default Disable

Set Default

System (AT/PS/2 protocol)

Set All Keys

Typematic

Make/Break

Make

When an external keyboard is

connected, commands from the

system will also be directed to the

external keyboard. Presence or

absence of an external keyboard

will not affect the normal operation

of the FlexiCoder^TM.

F7

F8

F9

FA

Typematic/Make/Break

Set Key Type

Typematic

Make/Break

Make

FB

FC

FD

Resend

FE

Reset

FF

Ta b le 2 : Keyboard Commands from the

System (AT/PS/2 protocol)

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

5

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

VCC

U1

1

C1

TC54VC4502ECB

TELCOM

.1uF

JUPERS SETTINGS

JP1

1-2:

2-3

PC/XT

PC/AT

+

C6

VCC

10uF

R6

R1 R2 R3 R4

100K

2x2K

2x4.7K

C17

5

C17

C16

C15

C14

C13

C12

C11

C10

C9

C8

C7

C6

C5

C4

C3

C2

C1

C0

C4A

C16

C15

C14

C13

C12

C11

C10

C9

C8

C7

C6

C5

12

24

25

26

27

28

29

30

31

21

20

19

17

16

15

14

13

18

11

10

41

EKD

EKC

EKC1

EXTERNAL_KBD_PS2DATA

EXTERNAL_KBD_PS2CLOCK

9

8

KC

KD

HOST_PS2DATA

HOST_PS2CLOCK

C4

C3

C2

C1

U2

C3

C2

C4

K25C81-FN

PLCC

C5

C0

4x47pF

3

23

NC

40

39

6

37

36

35

34

33

32

R7A

R7

R6

R5

R4

R3

R2

R1

R0

R7

VCC

R6

R5

R4

R3

R2

R1

R0

2

4

7

IRQ

VX

RP

VCC

RP1

NET_15K

R5

1M

Y1

4.00MHz

Application Circuit for K25C81-FB

.6

Rev

K25C81FB.sch

Document Number

AVX

PBRC4.00BR

STANDARD KEYMAP FOR K25C81

Ro w s (R0 -R7 )

0

1

2

3

4

5

6

7

F29

F28

End

F36

:

F34

F27

^

F35

F33

F31

F21

[

F37

F32

F25

F20

F23

F18

i

0

1

2

3

4

5

6

Pg Dn

Home

PgUp

F30

]

(

)

*

F22

v

w

x

y

z

;

o

p

q

r

s

t

u

h

i

j

k

l

m

n

a

b

c

d

e

f

g

7

8

9

.

, (comma)

- (dash)

/

%

W

N

E

&

#

0

S

T

U

V

M

D

4

X

Y

Z

J

K

L

O

P

Q

10

11

12

13

14

15

16

17

A

B

C

F

G

H

1

2

3

5

6

7

8

f3

f4

f6

f5

f15

f7

f11

f8

f9

9

f2

f14

f13

f12

f16

f10

+

f1

Backspace

Rt Arrow*

Dn Arrow*

Lft Arrow*

F38

R

Space

Enter

}

F19

$

Ins

Esc

Up Arrow*

=

Back-quote

’(Apostrophe)

* Typematic Keys

!

@

<

-

{

\

|

"

>

?

~

Tab

Del

n

Upper case A–Z correspond to Shift a–Shift z

F21–F30 correspond to Ctrl F1–Ctrl F10

n

F11–F20 correspond to Shift F1–Shift F10

F31–... correspond to Alt F1–Alt F10

n

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

6

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

3

2

1

N C

3 3

V S S

1 7

O D C O

3 6

V C C

3 8

C I O S

3 7

R S T

4 1

2

3

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

7

MECHANICALS FOR THE K25C81-P

40

1

21

20

B

L

A

C

J

N

M

K

H

G

F

D

Seating

Plane

Note s :

1. Pos itiona l tole ra nc e of le a d s (D) s ha ll b e

within 0.25 mm (0.010) a t ma ximum ma te ria l

c ond ition, in re la tion to the s e a ting p la ne a nd

e a c h othe r.

2. Dimins ion L is to the c e nte r of the le a d s whe n

the le a d s a re forme d p a ra lle l.

3. Dime ns ion B d oe s not inc lud e mold fla s h.

MILLIMETERS

INCHES

DIM MIN MAX MIN MAX

A

B

C

D

F

51.69 52.45

14.22

13.72

2.065

0.560

2.035

0.540

5.08 0.155 0.200

0.56 0.014 0.022

1.52 0.040 0.060

3.94

0.36

1.02

G

H

J

K

L

2.54 BSC

0.100 BSC

0.085

0.065

2.16

1.65

0.20 0.38 0.008 0.015

2.92 0.015

3.43

0.135

15.24 BSC 0.600 BSC

0 ⁰

0.51 1.02 0.020 0.040

15 ⁰

0

15 ⁰

0

M

N

Copyright Semtech, 1997-2001

DOC5-C81-DS-105

www.semtech.com

8

MECHANICALS FOR THE K25C81-FN

Y BRK

N

D

M

0.18 (0.007)

T

N

S

P

S

L

S

T

M S

-

B

M

L

4 4

M

0.18 (0.007)

S S S

N P L M S

-

U

Le a d s

P LC C

Note 1

W

Z1

D

(Note 1) 44

1

P

V

X

G1

M

0.18 (0.007)

T

L

S

M S

N

S

P

-

S

-

A

R

View D-D

M

0.25 (0.010)

T

N

S

S S

P L M S

-

Z

S

M S

-

P

-

M

0.18 (0.007)

T

L

S

M S

N

L

S

P

S

-

H

N

P

S

M S

-

C

K1

E

+

K

G

M

0.18 (0.007)

T

L

S

M S

N

L

S

P

S

-

M S

-

F

N

P

S

44

(Note 1)

J

Detail S

0.010 (0.004)

Seating Plane

G1

Detail S

T

M

0.25 (0.010)

T

L

S

M S

-

N

S

P

-

S

MILLIMETERS

INCHES

DIM MIN MAX MIN MAX

A

B

C

E

17.40 17.65

0.695

0.685

17.40 17.65 0.685 0.695

4.20 4.57 0.165 0.180

2.29 2.79 0.090 0.110

0.33 0.48 0.013 0.019

F

G

H

J

1.27 BSC

0.66 0.81 0.026 0.032

0.050 BSC

Note s :

1. Due to s p a c e limita tion, the c hip

is re p re s e nte d b y a g e ne ra l (s ma lle r)

c a s e outline d ra wing ra the r tha n

s howing a ll 44 le a d s .

2. Da tums L, M, N, a nd

the top of the le a d s hould e r e xits p la s tic

b od y a t mold p a rting line

3. DIM G1, true p os ition to b e me a s ure d

a t Da tum T, Se a ting Pla ne

4. DIM R a nd U d o not inc lud e mold

p rotus ion. Allowa b le mold p rotus ion is

0.25 (0.010) p e r s id e .

5. Dime ns ioning a nd tole ra nc ing p e r Ans i

Y14.5M, 1982

6. Controlling d ime ns ion: Inc h

0.51

0.64

-

0.020

0.025

-

K

R

U

V

W

X

Y

Z

16.51 16.66 0.650 0.656

1.07 1.21 0.042 0.048

1.07 1.42 0.042 0.056

P d e te rmine whe re

-

0.50

10 ⁰

-

0.020

0

2

10

G1 15.50 16.00 0.610 0.630

K1 1.02

Z1

-

0.040

2 10

-

0

2

10

DOC5-C81-DS-105

www.semtech.com

9

MECHANICALS FOR THE K25C81-FB

L

33

34

23

B

A,B,D

22

A

B

V

L

Detail A

44

12

1

11

Note s

D

1. Dime ns ioning a nd tole ra nc ing p e r Ans i

Y14.5-M, 1982

A

2. Controlling d ime ns ion: Millime te r

3. Da tum Pla ne "H" is loc a te d a t the

b ottom of the le a d a nd is c oinc id e nt

with the le a d whe re the le a d e xits

the p la s tic b od y a t the b ottom of the

p a rting line .

M

0.20 (0.008)

C

A-B

S

D

S

0.05 (0.002) A-B

F

S

Base Metal

4. Da tums -A-, -B-, a nd -D- to b e d e te rmine d

a t Da tum Pla ne -H-.

M

0.20 (0.008)

H

S

5. Dime ns ions

S a nd V to b e d e te rmine d

a t s e a ting p la ne -C-.

6. Dime ns ions A a nd B d o not inc lud e

Mold p rotus ion. Allowa b le p rotus ion

is 0.25 (0.010) p e r s id e . Dime ns ions

A a nd B d o inc lud e mold mis ma tc h

a nd a re d e te rmine d a t Da tum Pla ne -H-.

7. Dime ns ion D d oe s not inc lud e Da nb a r

p rotrus ion. Allowa b le Da nb a r

J

N

p rotrus ion is 0.08 (0.003) tota l in

e xc e s s of the D d ime ns ion

a t Ma ximum Ma te ria l Cond ition.

Da nb a r c a nnot b e loc a te d on the

lowe r ra d ius or the foot.

D

M

0.20 (0.008)

C

A-B

S

D

S

T

Section B-B

MILLIMETERS

INCHES

Datum

Plane

R

DIM MIN MAX MIN MAX

A

B

C

D

E

9.90 10.10

2.10 2.45 0.083 0.096

0.30 0.45 0.012 0.018

2.00 2.10 0.079 0.083

0.30 0.40 0.012 0.016

0.398

0.390

H

K

W

Detail C

Q

F

X

G

H

J

0.80 BSC

0.031 BSC

M

0.25

-

0.010

-

0.13 0.23 0.005 0.009

K

L

0.65

0.026

Detail C

0.95

0.037

8.00 REF

0.315 REF

0

M

N

Q

R

S

5

10 ⁰

5

10 ⁰

0

0.13 0.17 0.005 0.007

0

E

Datum

Plane

0

7

0

7

C

H

0.13 .30 0.005 0.012

12.95 13.45 0.510 0.530

0.01 (0.004)

C

Seating

Plane

T

0.13

-

0.005

-

0

-

U

V

W

X

G

0.530

12.95 13.45 0.510

0.40 0.016

1.6 REF

M

H

-

0.063 REF

DOC5-C81-DS-105

www.semtech.com

1 0

ELECTRICAL SPECIFICATIONS

Ab s o lu t e Ma x im u m Ra t in g s

Ra t in g s

Supply Voltage

S ym b o l

Va lu e

Un it

V

Vdd

Vin

I

-0.3 to +7.0

Vss -0.3 to Vdd +0.3

25

Input Voltage

Current Drain per Pin

(not including Vss or Vdd)

Operating Temperature

K25C81

mA

Ta

T low to T high

40 to +85

-65 to +150

° C

Storage Temperature Range

Tstg

Th e rm a l Ch a ra c t e ris t ic s

Ch a ra c t e ris t ic

S ym b o l

Va lu e

Un it

Thermal Resistence

Tja

° C per W

Plastic

DIP

Plcc

60

-60

70

DC Ele c t ric a l Ch a ra c t e ris t ic s (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted)

Ch a ra c t e ris t ic

Output Voltage (I load<10µA)

S ym b o l

Vol

Min

Typ

Ma x

0.1

Un it

V

Voh

Vol:

Vih

Vil

Idd

Iil

Iin

Cio

Vdd–0.1

Vdd–0.8

Output High Voltage (I load=0.8mA)

Output Low Voltage (I load=1.6mA)

Input High Voltage

Input Low Voltage

Supply Current

I/O Ports Hi-Z Leakage Current

Input Current

I/O Port Capacitance

V

mA

µA

pF

0.4

Vdd

0.7xVdd

Vss

0.2xVdd

7.0

+/-10

+/- 1

12

4.7

8

Co n t ro l Tim in g (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted)

Ch a ra c t e ris t ic

S ym b o l

Min

Ma x

Un it

Frequency of Operation

Crystal Option

External Clock Option

fosc

MHz

4.0

dc

DOC5-C81-DS-105

www.semtech.com

1 1

Fo r s a le s in fo rm a t io n

a n d p ro d u c t lit e ra t u re ,

c o n t a c t :

HID & System Mgmt Division

Semtech Corporation

568 Broadway

New York, NY 10012

h id in fo @s e m t e c h .c o m

h t t p ://w w w .s e m t e c h .c o m

212 226 2042 Telephone

212 226 3215 Telefax

Semtech Western Regional Sales

805-498-2111 Telephone

805-498-3804 Telefax

Semtech Central Regional Sales

972-437-0380 Telephone

972-437-0381 Telefax

Semtech Eastern Regional Sales

203-964-1766 Telephone

203-964-1755 Telefax

Semtech Asia-Pacific Sales Office

+886-2-2748-3380 Telephone

+886-2-2748-3390 Telefax

Semtech Japan Sales Office

+81-45-948-5925 Telephone

+81-45-948-5930 Telefax

Semtech Korea Sales Sales

+82-2-527-4377 Telephone

+82-2-527-4376 Telefax

Northern European Sales Office

+44 (0)2380-769008 Telephone

+44 (0)2380-768612 Telefax

Southern European Sales Office

+33 (0)1 69-28-22-00 Telephone

+33 (0)1 69-28-12-98 Telefax

Central European Sales Office

+49 (0)8161 140 123 Telephone

+49 (0)8161 140 124 Telefax

KeyCoder, FlexiCoder and Self-Power Management are trademarks

of Semtech Corporation. Semtech is a registered trademark of

Semtech Company. All other trademarks belong to their respective

companies.

INTELLECTUAL PROPERTY DISCLAIMER

This specification is provided "as is" with no warranties whatsoever

including any warranty of merchantability, fitness for any particular

purpose, or any warranty otherwise arising out of any proposal,

specification or sample. A license is hereby granted to reproduce

and distribute this specification for internal use only. No other

license, expressed or implied to any other intellectual property

rights is granted or intended hereby. Authors of this specification

disclaim any liability, including liability for infringement of proprietary

rights, relating to the implementation of information in this

specification. Authors of this specification also do not warrant or

represent that such implementation(s) will not infringe such rights.

DOC5-C81-DS-105

1 2

www.semtech.com


型号：	K25C81
厂家：	SEMTECH CORPORATION
描述：	Versatile PC/XC/AT/PS/2 Compatible Keyboard Encoder 多功能PC / XC / AT / PS / 2兼容键盘编码器编码器 PC
文件：	总12页 (文件大小：126K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

K25C81 [SEMTECH]

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