Page 1
FlexiCoderTMK25C81
Versatile PC/XC/AT/PS/2 Compatible
Keyboard Encoder
FlexiCoderTMis 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
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTMFAMILY
DESCRIPTION FEATURES
1
_RESET
40 Vcc
OSCI
OSCO
EKC1
R7
NC
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
C12
C13
C14
C15
_IRQ
VX
C17
R6
RP
KD
KC
EKC
EKD
C16
C0
C1
C2
C3
C4
C5
C6
C7
Vss
2
39
3
38
4
37
5
36
6
35
7
34
8
33
9
32
10 31
11 30
12 29
13 28
14 27
15 26
16 25
17 24
18 23
19 22
20 21
DIP
R6
C17VXNC
_IRQ
_RESET
VCC
OSCI
OSC0
EKC1
NC
RP
KD
KC
EKC
EKD
C16
C0
C1
C2
C3
C4
R7
NC
R5
R4
R3
R2
R1
R0
C8
C9
C10
NC
C5C6C7
VSS
NC
C15
C14
C13
C12
C11
40
1
6
7
12
17
18
23
28
29
34
39
R6
RP
KD
KC
EKC
EKD
C16
C0
C1
C2
C3
C17VX_IRQ
_RESETNCNC
VCC
OSCI
OSCO
EKC1
R7
NC
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
C4C5C6
C7
NC
VSS
C15
C14
C13
C12
NC
1
PLCC
QFP
• 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
• Medical Instruments
• Enables custom keypad scan
codes to remain unaffected by
the Shift States of an external
keyboard
• Includes jumper-selectable autorepeat for designated keys
• Offers two-key inhibit scanning
mode
• Directly interfaces a PC
keyboard port
• Encodes up to 144 custom keys
on an 8 X 18 matrix
• Buffers up to 122 keycodes
• Interfaces to 83/101/102
standard keyboard or other
8042-compatible device
The FlexiCoderTMis a versatile, lowpower keyboard encoder. It offers
two bi-directional channels for
communicating with a
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.
On an 8 x 18 matrix, the
FlexiCoder
TM
will 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.
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
encoder can buffer up to 122
keycodes, and control inputs and
outputs are provided for interfacing
with contact keyboards.
The FlexiCoderTMis 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.
APPLICATIONS
PIN ASSIGNMENTS
Page 2
FUNCTIONAL DIAGRAM
ORDERING CODE
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
2
Package options
40-pin, Plastic DIP
44-pin, Plastic PLCC
44-pin, Plastic QFP
Pitch In mm’s
2.54 mm
1.27 mm
0.8 mm
TA = -40°C to +85°C
K25C81-XX-P
K25C81-XX-FN
K25C81-XX-FB
Data Buffer
Interrupt Control
PC
Communication
Channel
8042 Emulation
(Standard Keyboard)
Communication Channel
EKC1
KC
KD
EKC
EKD
Keyboard Encoder
Mode Control
Row Data Inputs
Column Select Ouputs
R0-R7
RP
C0-C17
8
18
Page 3
FUNCTIONAL DESCRIPTION PIN DEFINITIONS
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
3
Mnemonic DIP PLCC QFP TYPE Name and Function
Vcc 40 44 38 I Power Supply: +5V
Vss 20 22 17 I Ground
OSCI 39 43 37 I Oscilator Input
OSCO 38 42 36 O Oscilator Output
_RESET 1 1 41 I Reset: apply 0 V to provide orderly
start-up.
_IRQ 2 2 42 I Must be tied to Vcc
VX 3 4 43 I Tie to Vcc.
RP 672I Rollover Mode Selection: tie to
Vcc to select N-Key Rollover. Tie to
Ground to select Two-Key Inhibit
Mode.
KC 894I/OKeyboard Clock: connects to PC’s
keyboard port Clock Line.
KD 783I/OKeyboard Data: connects to PC’s
keyboard port Data Line.
EKD 10 11 6 I/O External Keyboard Data:
connects to external keyboard Data
Line.
EKC 9 10 5 I/O External Keyboard Clock:
connects to external keyboard Clock
Line.
EKC1 37 41 35 I External Keyboard Clock 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.
C0-C7 12-19 3-17 8-15 O Column Select Outputs: select
18 one of columns.
19-21
C8-C15 28-21 31-24 26-18
C16 11 12 7 O
C17 4 5 44 I/O Keyboard type selection: this pin
is used both as outputs for column
select and as input for standard
keyboard-type selection.
R0-R5 29-34 32-37 27-32 I Row data inputs
R6 561I
R7 36 39 34 I
NC 35 38, 3 16, 33 - No Connects: these pins are
18, 23 22, 39 - unused.
40 40
Note: An underscore before a pin mnemonic denotes an active low signal.
The FlexiCoderTMconsists 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
concurrently.
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).
A key closure is detected as a zero
in the corresponding position of the
matrix. A complete scan cycle for
the entire keyboard takes approximately 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.
Page 4
REPEAT KEYS FUNCTIONAL DESCRIPTION, (CON’T)
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
4
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.
Table 1: Typematic Action Control
The Typematic rate can be
controlled by issuing the
appropriate commands from the
system.
Repeat Mode RP
No repeat action L
Repeat action H
Switch Matrix Encoding
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 FlexiCoderTMsupports 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.
Scan Matrix Data Integrity
The FlexiCoderTMmaintains 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:
1. Caps Lock Make Code
2. Caps Lock Break (this will reset the Caps Lock status of the system)
3. “a” Make Code
4. “a” Break Code
5. Lock Make Code
6. Caps Lock Break Code (this will restore the Caps Lock status of the
system)
SPECIAL HANDLING
SPECIAL HANDLING, (CON’T)
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
FlexiCoderTMchecks for the
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.
Page 5
EXT. KBD COMMUNICATION MODE CONTROL
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
5
The external keyboard
communication port of the
FlexiCoderTMfully emulates a
standard 8042, available to an
83/101/102 external keyboard or
other compatible device.
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.
When power is first applied, the
controller proceeds with the
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.
The FlexiCoderTMimplements all the
standard functions of
communication with a BIOScompatible 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.
Command Hex Value
Set/Reset Status ED
Indicators
Echo EE
Invalid Command EF
Select Alternate F0
Scan Codes
Invalid Command F1
Read ID F2
Set Typematic F3
Rate/Delay
Enable F4
Default Disable F5
Set Default F6
Set All Keys
Typematic F7
Make/Break F8
Make F9
Typematic/Make/Break FA
Set Key Type
Typematic FB
Make/Break FC
Make FD
Resend FE
Reset FF
Table 2: Keyboard Commands from the
System (AT/PS/2 protocol)
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
external standard keyboard is
present.
The following table shows the
commands that the keyboard may
send to the system.
Command Hex Value
Key Detection 00*
Error/Overrun
Keyboard ID 83AB
BAT Completion Code AA
BAT Failure Code FC
Echo EE
Acknowledge (Ack) FA
Resend FE
Key Detection
Error/Overrun FF*
*Scan Code Set 2
Table 3: Keyboard Commands to the
System (AT/PS/2 protocol)
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 FlexiCoderTM.
Page 6
SUGGESTED INTERFACING FOR K25C81-FN (44-PIN PLCC PACKAGE)
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
6
Rows (R0-R7)
01234567
F29 F28 End F36 F34 F35 F33 F37
Pg Dn Home PgUp : F27 F30 F31 F32
]()*^F22F21F25
vwxyz; [F20
opqr st uF23
hijklmnF18
abcdef gi
. , (comma) - (dash) / % & # 0
STUVWXYZ
JKLMNOPQ
ABCDEF GH
12345678
f3 f4 f6 f5 f7 f8 f9 f2
f14 f13 f12 f15 f11 f16 9 f10
f1 Backspace Rt Arrow* Dn Arrow* F38 Space F19 +
Ins Esc Up Arrow* Lft Arrow* R Enter $ =
Back-quote ! @ -{}\|
’(Apostrophe) " < > ? ~ Tab Del
* Typematic Keys
n Upper case A–Z correspond to Shift a–Shift z n F11–F20 correspond to Shift F1–Shift F10
n
F21–F30 correspond to Ctrl F1–Ctrl F10 n F31–... correspond to Alt F1–Alt F10
Columns (C0–C17)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
STANDARD KEYMAP FOR K25C81
VC
C
C
VC
C1
B
.
1uF
+
C6
10u
F
1
44
RST
VCC
11
EKD
10
EKC
41
EKC1
9
KC
8
KD
K25C81-FN
3
NC
23
NC
2
IRQ
4
VX
7
RP
OSCI
43
R5
1M
Y1
Hz
AVX
PLCC
38
NC
5
C17
12
C16
24
C15
25
C14
26
C13
27
C12
28
C11
29
C10
30
C9
31
C8
21
C7
20
C6
19
C5
17
C4
16
U2
ODCO
42
C3
15
C2
14
C1
13
C0
18
C4A
40
R7A
39
R7
6
R6
37
R5
36
R4
35
R3
34
R2
33
R1
32
R0
VSS
22
RP1
NET_15
EXTERNAL_KBD_PS2DATA
EXTERNAL_KBD_PS2CLOC
HOST_PS2DAT
HOST_PS2CLOC
23
U1
1
TC54VC4502EC
TELCOM
VCC
R1
2x4.7K
K
A
K
C2
R4R3R2
2x2K
C3
C4
C5
4x47pF
VCC
4.00M
PBRC4.00BR
K
VCC
JP1
123
C
VC
R6
100K
JUPERS SETTINGS
JP1 1-2: PC/XT
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
(c)1994-2001 USAR SYSTEMS, Inc.
Applica tion Circuit f or K25C81-FB
K25C81FB.sch
Document Number
PC/AT2-3
.6
Rev
Page 7
SUGGESTED INTERFACING FOR K25C81-FB (44-PIN QFP PACKAGE)
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
7
.6
Rev
K25C81FB.sch
Document Number
Application Circuit for K25C81-FB
(c)1994-2001 USAR SYSTEMS, In c.
Hz
1M
Y1
AVX
4.00M
PBRC4.00BR
C
VC
C
VC
U1
23
PC/AT2-3
R6R3R0
U2
K25C81-FB
C5
C0
QFP44
NC
40
4x47pF
39
3413231302928
R7R6R5R4R3R2R1
NC
NC
NC
16
22
R4R2R5R1R7
VCC
K
RP1
NET_15
27
R0
VSS
17
ODCO
36
OSCI
37
IRQ
VX
43
42
VCC
R5
RP
2
C15
C14
C13
C12
C11
C10C9C8C7C6C5C4C3C2C1C0
C16
JUPERS SETTINGS
JP1 1-2: PC/XT
JP1
3
2
1
C
VC
C6
+
1uF
C1
.
B
TELCOM
TC54VC4502EC
1
C17
R6
100K
44
7
1819202123
24.252615141312111098
C9C8C7C6C5C4C3C2C1
C17
C16
C15
C14
C13
C12
C11
C10
NC
33
F
10u
VCC
38
RST
41
EKC1
EKC
EKD
KC
6
KD
4
3
5
35
2x2K
R4R3R2
C4
1
VCC
R1
C3
C2
2x4.7K
K
A
K
HOST_PS2DAT
HOST_PS2CLOC
EXTERNAL_KBD_PS2DATA
EXTERNAL_KBD_PS2CLOC
Page 8
MECHANICALS FOR THE K25C81-P
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
8
40 21
1 20
A
H
G
F
D
Seating
Plane
B
L
C
J
N
M
K
Notes:
1. Positional tolerance of leads (D) shall be
within 0.25 mm (0.010) at maximum material
condition, in relation to the seating plane and
each other.
2. Diminsion L is to the center of the leads when
the leads are formed parallel.
3. Dimension B does not include mold flash.
MILLIMETERS INCHES
MIN MAX
DIM
A 51.69 52.45
B
13.72
C
3.94
D
0.36
1.02
F
G
2.54 BSC 0.100 BSC
H
1.65
J
0.20 0.008
K
2.92 0.015
L
15.24 BSC 0.600 BSC
0
M
0
N
0.51
MIN MAX
2.065
2.035
0.540
0.560
14.22
5.08 0.155 0.200
0.56 0.014
0.022
1.52 0.040 0.060
2.16 0.085
0.065
0.38
0.015
0.1353.43
0
0
0
15 0 15
1.02 0.020 0.040
Page 9
MECHANICALS FOR THE K25C81-FN
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
9
44
(Note 1)
Z
C
+
G1
M
0.25 (0.010) T-LSMSNSP
L
(Note 1) 44
G
N
44
Leads
PLCC
Y BRK
M
D
M
0.18 (0.007) T LSM
B
NSP
0.18 (0.007) T L
U
S
S
--
M
NSP
SMS
S
-
-
Note 1
W
Z1
1
P
0.18 (0.007) T-LSMSNSP
A
0.18 (0.007) T-LSMSNSP
R
+
E
J
Detail S
S
-
M
M
0.010 (0.004)
T
Seating Plane
V
-
-
Notes:
1. Due to space limitation, the chip
is represented by a general (smaller)
case outline drawing rather than
showing all 44 leads.
2. Datums L, M, N, and P determine where
the top of the lead shoulder exits plastic
body at mold parting line
3. DIM G1, true position to be measured
at Datum T, Seating Plane
4. DIM R and U do not include mold
protusion. Allowable mold protusion is
0.25 (0.010) per side.
5. Dimensioning and tolerancing per Ansi
Y14.5M, 1982
6. Controlling dimension: Inch
D
H
X
0.18 (0.007)
0.18 (0.007)TT
S
S
View D-D
G1
0.25 (0.010) T
M
LSMSNSP
-
M
NSP
-
M
S
NSP
LSM
LSM
S
S
-
-
S
-
S
-
K1
K
M
Detail S
0.18 (0.007)
F
0.18 (0.007)
LSMSNSP
T
-
M
DIM
A
B
C
E
F
G
H
J
K
R
U
V
W
X
Y
Z
G1
K1
Z1
LSM
NSP
T
S
--
MILLIMETERS INCHES
MAX MIN MAX
MIN
17.40 17.65
17.65 0.685 0.695
17.40
4.20 4.57 0.165 0.180
2.29 2.79 0.090 0.110
0.33 0.48 0.013 0.019
1.27 BSC 0.050 BSC
0.66 0.81 0.026 0.032
0.51 - 0.020 -
0.64 - 0.025 -
16.51 16.66 0.650 0.656
16.51 16.66 0.650 0.656
1.21 0.042 0.048
1.07
1.07 1.21 0.042 0.048
1.07 1.42 0.042 0.056
- 0.50 - 0.020
00
2 10 2 10
15.50 16.00 0.610 0.630
1.02 - 0.040 -
00
0
2 10 2 10
-
0.685
S
S
0.695
0
0
Page 10
MECHANICALS FOR THE K25C81-FB
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
10
L
L
Datum
Plane
A
H
C
Seating
Plane
33 23
34
44
1
D
A
M
0.20 (0.008) C
0.05 (0.002) A-B
S
M
0.20 (0.008) H
Detail C
E
C
H
Detail A
A-B
A-B
W
G
22
12
S
D
S
A-B
B
M
0.20 (0.008) C
0.05 (0.002) A-B
S
D
S
A-B
V
M
0.20 (0.008) H
B
Detail A
B
A,B,D
11
Notes
1. Dimensioning and tolerancing per Ansi
Y14.5-M, 1982
S
S
D
F
S
S
D
Base Metal
JN
M
T
R
D
M
0.20 (0.008) C
Section B-B
S
S
D
A-B
K
Q
X
M
Detail C
Datum
H
Plane
0.01 (0.004)
M
2. Controlling dimension: Millimeter
3. Datum Plane "H" is located at the
bottom of the lead and is coincident
with the lead where the lead exits
the plastic body at the bottom of the
parting line.
4. Datums -A-, -B-, and -D- to be determined
at Datum Plane -H-.
5. Dimensions S and V to be determined
at seating plane -C-.
6. Dimensions A and B do not include
Mold protusion. Allowable protusion
is 0.25 (0.010) per side. Dimensions
A and B do include mold mismatch
and are determined at Datum Plane -H-.
7. Dimension D does not include Danbar
protrusion. Allowable Danbar
protrusion is 0.08 (0.003) total in
excess of the D dimension
at Maximum Material Condition.
Danbar cannot be located on the
lower radius or the foot.
MILLIMETERS INCHES
MIN MAX MIN MAX
DIM
A 9.90 10.10
B
9.90 10.10
2.45 0.083 0.096
C
2.10
D
0.30 0.45 0.012 0.018
E
2.00 2.10 0.079 0.083
0.30 0.40 0.012 0.016
F
G
0.80 BSC 0.031 BSC
H
0.25 0.010
-
J
0.23
0.13
K
0.65
L
8.00 REF 0.315 REF
0
M
5 10 5 10
N
0.17 0.005 0.007
0.13
0
Q
0 7 0 7
R
0.13 .30 0.005 0.012
S
13.45 0.530
12.95 0.510
T
0.13 0.005
0
0
U
12.95
13.45
V
W
0.40 0.016
X
1.6 REF
0.398
0.390
0.398
0.390
-
0.009
0.005
0.026
0.0370.95
0
0
0
0
0
0
0.510
0.063 REF
0
-
0.530
--
0
-
--
Page 11
ELECTRICAL SPECIFICATIONS
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
11
Absolute Maximum Ratings
Ratings Symbol Value Unit
Supply Voltage Vdd -0.3 to +7.0 V
Input Voltage Vin Vss -0.3 to Vdd +0.3 V
Current Drain per Pin I 25 mA
(not including Vss or Vdd)
Operating Temperature Ta T low to T high ° C
K25C81 40 to +85
Storage Temperature Range Tstg -65 to +150 ° C
Thermal Characteristics
Characteristic Symbol Value Unit
Thermal Resistence Tja ° C per W
Plastic 60
DIP -60
Plcc 70
DC Electrical Characteristics (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted)
Characteristic Symbol Min Typ Max Unit
Output Voltage (I load<10µA) Vol 0.1 V
Voh Vdd–0.1
Output High Voltage (I load=0.8mA) Voh Vdd–0.8 V
Output Low Voltage (I load=1.6mA) Vol: 0.4 V
Input High Voltage Vih 0.7xVdd Vdd V
Input Low Voltage Vil Vss 0.2xVdd V
Supply Current Idd 4.7 7.0 mA
I/O Ports Hi-Z Leakage Current Iil +/-10 µA
Input Current Iin +/- 1 µA
I/O Port Capacitance Cio 8 12 pF
Control Timing (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted)
Characteristic Symbol Min Max Unit
Frequency of Operation fosc MHz
Crystal Option 4.0
External Clock Option dc 4.0
Page 12
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
www.semtech.com
12
For sales information
and product literature,
contact:
HID & System Mgmt Division
Semtech Corporation
568 Broadway
New York, NY 10012
hidinfo@semtech.com
http://www.semtech.com
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
Copyright 1997-2001 Semtech Corporation. All rights reserved.
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.
Loading...