FlexiCoderTM K25C81
Versatile PC/XC/AT/PS/2 Compatible
Keyboard Encoder
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY
• 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
• 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
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
Medical Instruments
_RESET
1
40 Vcc
_IRQ
2
39 OSCI
VX
3
38 OSCO
C17
4
37 EKC1
R6
5
36 R7
RP
6
35 NC
KD
7
34 R5
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.
KC
The FlexiCoder is 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.
8
33 R4
EKC
9
EKD
10
32 R3
C16
11
30 R1
C0
12
29 R0
C1
13
28 C8
C2
14
27 C9
C3
15
26 C10
C4
16
25 C11
C5
17
24 C12
C6
18
23 C13
C7
19
22 C14
Vss
20
21 C15
DIP
31 R2
C17
VX
_IRQ
_RESET
NC
NC
VCC
OSCI
OSCO
EKC1
R7
PIN ASSIGNMENTS
6
RP
KD
KC
EKC
EKD
C16
C0
C1
C2
C3
C4
7
1
40
39
12
PLCC
34
17
18
23
29
28
1
R7
NC
R5
R4
R3
R2
R1
R0
C8
C9
C10
R6
RP
KD
KC
EKC
EKD
C16
C0
C1
C2
C3
TM
FlexiCoderTM is a trademark of Semtech Corp. All
other trademarks belong to their respective
companies.
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
1
QFP
C4
C5
C6
C7
NC
VSS
C15
C14
C13
C12
NC
On an 8 x 18 matrix, the
FlexiCoderTM 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.
FEATURES
R6
C17
VX
NC
_IRQ
_RESET
VCC
OSCI
OSC0
EKC1
NC
The FlexiCoder is 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.
TM
NC
C5
C6
C7
VSS
NC
C15
C14
C13
C12
C11
DESCRIPTION
www.semtech.com
NC
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
ORDERING CODE
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
FUNCTIONAL DIAGRAM
Keyboard Encoder
Data Buffer
R0-R7
Row Data Inputs
8
EKC1
Interrupt Control
C0-C17
Column Select Ouputs
18
KC
KD
PC
Communication
Channel
Mode Control
EKC
EKD
8042 Emulation
(Standard Keyboard)
Communication Channel
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
2
www.semtech.com
RP
FUNCTIONAL DESCRIPTION
PIN DEFINITIONS
The FlexiCoderTM consists 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.
Mnemonic
Vcc
Vss
OSCI
OSCO
_RESET
DIP
40
20
39
38
1
PLCC
44
22
43
42
1
QFP
38
17
37
36
41
TYPE
I
I
I
O
I
_IRQ
VX
RP
2
3
6
2
4
7
42
43
2
I
I
I
KC
8
9
4
I/O
KD
7
8
3
I/O
EKD
10
11
6
I/O
EKC
9
10
5
I/O
EKC1
37
41
35
I
C0-C7
12-19
8-15
O
C8-C15
C16
C17
28-21
11
4
3-17
18
19-21
31-24
12
5
26-18
7
44
O
I/O
R0-R5
R6
R7
NC
29-34
5
36
35
32-37
6
39
38, 3
18, 23
40
27-32
1
34
16, 33
22, 39
40
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.
I
I
I
-
Name and Function
Power Supply: +5V
Ground
Oscilator Input
Oscilator Output
Reset: apply 0 V to provide orderly
start-up.
Must be tied to Vcc
Tie to Vcc.
Rollover Mode Selection: tie to
Vcc to select N-Key Rollover. Tie to
Ground to select Two-Key Inhibit
Mode.
Keyboard Clock: connects to PC’s
keyboard port Clock Line.
Keyboard Data: connects to PC’s
keyboard port Data Line.
External Keyboard Data:
connects to external keyboard Data
Line.
External Keyboard Clock:
connects to external keyboard Clock
Line.
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.
Column Select Outputs: select
one of columns.
Keyboard type selection: this pin
is used both as outputs for column
select and as input for standard
keyboard-type selection.
Row data inputs
No Connects: these pins are
unused.
Note: An underscore before a pin mnemonic denotes an active low signal.
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
3
www.semtech.com
REPEAT KEYS
FUNCTIONAL DESCRIPTION, (CON’T)
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.
Switch Matrix Encoding
Repeat Mode
RP
No repeat action
L
Repeat action
H
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 FlexiCoderTM supports 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.
Table 1: Typematic Action Control
SPECIAL HANDLING, (CON’T)
The Typematic rate can be
controlled by issuing the
appropriate commands from the
system.
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
FlexiCoderTM checks 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.
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
Scan Matrix Data Integrity
The FlexiCoderTM maintains 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)
4
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EXT. KBD COMMUNICATION
MODE CONTROL
The external keyboard
communication port of the
FlexiCoderTM fully 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.
The FlexiCoderTM implements 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.
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.
Command
Hex Value
Command
Set/Reset Status
Indicators
ED
Key Detection
Error/Overrun
00*
Echo
EE
Keyboard ID
83AB
Invalid Command
EF
BAT Completion Code
AA
Select Alternate
Scan Codes
F0
BAT Failure Code
FC
Invalid Command
F1
Read ID
F2
Set Typematic
Rate/Delay
F3
Enable
F4
Default Disable
F5
Set Default
F6
Set All Keys
Typematic
Make/Break
Make
Typematic/Make/Break
F7
F8
F9
FA
Set Key Type
Typematic
Make/Break
Make
FB
FC
FD
Resend
FE
Reset
FF
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 following table shows the
commands that the keyboard may
send to the system.
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.
Table 2: Keyboard Commands from the
System (AT/PS/2 protocol)
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
5
Hex Value
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SUGGESTED INTERFACING FOR K25C81-FN (44-PIN PLCC PACKAGE)
2
VCC
VCC
U1
1
3
C1
TC54VC4502ECB
.1uF
C6
VCC
10uF
EXTERNAL_KBD_PS2DATA
11
EKD
EXTERNAL_KBD_PS2CLOCK
10
EKC
41
HOST_PS2DATA
HOST_PS2CLOCK
C4
PC/XT
2-3
PC/AT
EKC1
9
KC
8
KD
U2
C5
K25C81-FN
PLCC
4x47pF
3
23
NC
NC
43
5
12
24
25
26
27
28
29
30
31
21
20
19
17
16
15
14
13
18
R7A
R7
R6
R5
R4
R3
R2
R1
R0
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
R7
R6
R5
R4
R3
R2
R1
R0
VSS
C17
C16
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
C4A
VCC
RP1
22
RP
42
VX
7
OSCI
IRQ
4
ODCO
VCC
2
100K
38
NC
44
RST
VCC
1
2x2K
C3
1-2:
R6
R1 R2 R3 R4
C2
JP1
1
2
3
+
VCC
2x4.7K
JUPERS SETTINGS
JP1
TELCOM
R5
NET_15K
1M
Y1
4.00MHz
(c)1994-2001 USAR SYSTEMS, Inc.
Application Circuit for K25C81-FB
.6
Document Number K25C81FB.sch Rev
AVX
PBRC4.00BR
STANDARD KEYMAP FOR K25C81
Columns (C0–C17)
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
!
’(Apostrophe) "
* Typematic Keys
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
2
End
PgUp
)
x
q
j
c
- (dash)
U
L
C
3
f6
f12
Rt Arrow*
Up Arrow*
@
<
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
}
~
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
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
6
www.semtech.com
EXTERNAL_KBD_PS2DATA
HOST_PS2CLOCK
HOST_PS2DATA
EXTERNAL_KBD_PS2CLOCK
C2
2x4.7K
C3
C4
C5
R1 R2 R3 R4
VCC
2
3
4x47pF
2x2K
VCC
TELCOM
1M
R5
RP
VX
IRQ
NC
NC
NC
NC
KD
KC
EKC1
EKC
EKD
.1uF
C1
PBRC4.00BR
AVX
Y1
4.00MHz
2
43
42
40
39
16
22
3
4
35
5
6
TC54VC4502ECB
41
RST
U2
+
K25C81-FB
QFP44
VCC
38
VCC
U1
OSCI
37
1
C6
10uF
ODCO
36
VCC
17
7
33
NC
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
VSS
1
R7
R6
R5
R4
R3
R2
R1
R0
C17
C16
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
34
1
32
31
30
29
28
27
44
7
18
19
20
21
23
24.
25
26
15
14
13
12
11
10
9
8
VCC
NET_15K
RP1
VCC
1
2
3
100K
R6
JP1
PC/XT
PC/AT
1-2:
2-3
(c)1994-2001 USAR SYSTEMS, Inc.
Application Circuit for K25C81-FB
Document Number K25C81FB.sch Rev .6
R7
R6
R5
R4
R3
R2
R1
R0
C17
C16
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
JP1
JUPERS SETTING
S
SUGGESTED INTERFACING FOR K25C81-FB (44-PIN QFP PACKAGE)
www.semtech.com
MECHANICALS FOR THE K25C81-P
40
21
B
1
L
20
A
C
J
N
M
H
G
F
K
D
Seating
Plane
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.
DIM
A
B
C
D
F
G
H
J
K
L
M
N
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
8
MILLIMETERS
INCHES
MIN MAX
51.69 52.45
13.72 14.22
3.94 5.08
0.36 0.56
1.02 1.52
2.54 BSC
1.65 2.16
0.20 0.38
2.92 3.43
15.24 BSC
00
15 0
0.51 1.02
MIN MAX
2.035 2.065
0.540 0.560
0.155 0.200
0.014 0.022
0.040 0.060
0.100 BSC
0.065 0.085
0.008 0.015
0.015 0.135
0.600 BSC
00
15 0
0.020 0.040
www.semtech.com
MECHANICALS FOR THE K25C81-FN
Y BRK
N
D
L
0.18 (0.007) M T N S -P S L S -M S
B
M
44
Leads
PLCC
U
0.18 (0.007)
M
T N S -P S L S -M S
Note 1
W
Z1
D
1
(Note 1) 44
P
V
A
Z
0.18 (0.007)
R
C
0.18 (0.007)
M
M
T L S -M S N S -P S
G1
0.25 (0.010)
M
T N S -P S L S -M S
H
0.18 (0.007) M T L S -M S N S -P S
0.18 (0.007) M T N S -P S L S -M S
F
0.18 (0.007)
0.18 (0.007)
K1
E
+
X
View D-D
T L S -M S N S -P S
+
K
G
44
(Note 1)
J
G1
M
T L S -M S N S -P S
T N S -P S L S -M S
Detail S
Seating Plane
T L S -M S N S -P S
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
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
M
0.010 (0.004)
Detail S
T
0.25 (0.010)
M
9
DIM
A
B
C
E
F
G
H
J
K
R
U
V
W
X
Y
Z
G1
K1
Z1
MILLIMETERS
INCHES
MIN MAX
17.40 17.65
17.40 17.65
4.20 4.57
2.29 2.79
0.33 0.48
1.27 BSC
0.66 0.81
0.51 0.64 16.51 16.66
16.51 16.66
1.07 1.21
1.07 1.21
1.07 1.42
- 0.50
20
10 0
15.50 16.00
1.02
20
10 0
MIN MAX
0.685 0.695
0.685 0.695
0.165 0.180
0.090 0.110
0.013 0.019
0.050 BSC
0.026 0.032
0.020 0.025 0.650 0.656
0.650 0.656
0.042 0.048
0.042 0.048
0.042 0.056
- 0.020
20
10 0
0.610 0.630
0.040 2
10 0
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MECHANICALS FOR THE K25C81-FB
L
23
B
Detail A
D S
H A-B S
V
M
B
L
Detail A
12
44
1
11
Notes
D
A
0.20 (0.008) M C A-B S
0.05 (0.002) A-B
D S
F
S
0.20 (0.008)
M
H A-B S
Base Metal
D S
J
0.20 (0.008)
T
Datum
Plane
N
D
M
M
C A-B S
D S
MILLIMETERS
H
K
W
Detail C
Q
X
M
Detail C
C
Seating
Plane
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
1. Dimensioning and tolerancing per Ansi
Y14.5-M, 1982
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.
Section B-B
R
C
A,B,D
B
0.20 (0.008)
A
D S
22
0.20 (0.008) M C A-B S
0.05 (0.002) A-B
33
34
E
H
Datum
Plane
0.01 (0.004)
G
M
H
10
DIM
A
B
C
D
E
F
G
H
J
K
L
M
N
Q
R
S
T
U
V
W
X
MIN MAX
9.90 10.10
9.90 10.10
2.10 2.45
0.30 0.45
2.00 2.10
0.30 0.40
0.80 BSC
- 0.25
0.13 0.23
0.65 0.95
8.00 REF
50
10 0
0.13 0.17
0
0
70
0.13 .30
12.95 13.45
0.13
00
12.95 13.45
0.40 1.6 REF
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INCHES
MIN MAX
0.390 0.398
0.390 0.398
0.083 0.096
0.012 0.018
0.079 0.083
0.012 0.016
0.031 BSC
- 0.010
0.005 0.009
0.026 0.037
0.315 REF
50
10 0
0.005 0.007
0
0
7 0
0.005 0.012
0.510 0.530
0.005 00
0.510 0.530
0.016 0.063 REF
ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings
Ratings
Supply Voltage
Input Voltage
Current Drain per Pin
(not including Vss or Vdd)
Operating Temperature
K25C81
Storage Temperature Range
Symbol
Vdd
Vin
I
Value
-0.3 to +7.0
Vss -0.3 to Vdd +0.3
25
Unit
V
V
mA
Ta
T low to T high
40 to +85
-65 to +150
°C
Tstg
°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
Frequency of Operation
fosc
Crystal Option
4.0
External Clock Option
dc
4.0
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
11
www.semtech.com
Unit
MHz
For sales information
and product literature,
contact:
HID & System Mgmt Division
Semtech Corporation
568 Broadway
New York, NY 10012
[email protected]
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
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203-964-1766 Telephone
203-964-1755 Telefax
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+886-2-2748-3380 Telephone
+886-2-2748-3390 Telefax
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+81-45-948-5925 Telephone
+81-45-948-5930 Telefax
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+82-2-527-4377 Telephone
+82-2-527-4376 Telefax
Northern European Sales Office
+44 (0)2380-769008 Telephone
+44 (0)2380-768612 Telefax
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+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.
Copyright Semtech, 1997-2001
DOC5-C81-DS-105
12
www.semtech.com