DeskCoderTM UR5HC418
AT / PS/2 - Compatible
Keyboard Encoder
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY
The DeskCoderTM fully supports the
IBM standard keyboard communication protocol; each key press
generates one of the scan codes
designated in the IBM Technical
Reference Manuals. The keyboard
encoder handles the scanning,
debounce, and encoding of 128
keys organized on an 8 x 16 matrix.
• Interfaces contact switch matrix
keyboards to a BIOS-compatible
system
• Single IC desktop keyboard
encoder
• Provides interface for an external
keyboard/keypad or other 8042compatible devices
• AT / PS/2 - compatible
• Implements all functions of a
101/102/104 keyboard
• Low-power HCMOS
microcontroller, suitable for 3-volt
battery-operated systems
• Available in DIP, PLCC and QFP
packages
• Custom versions available in small
or large quantities
APPLICATIONS
• Point of sales terminals
• Public information kiosks
• Desktop computers
• Instrumentation
• Industrial keyboards
PIN ASSIGNMENTS
R6
NL
VX
VXA
_IRQ
_RESET
VCC
OSCI
OSC0
EKC1
R7A
In addition to the system’s keyboard
communication port, the UR5HC418
provides a fully functional keyboard
input port that can be used by a
standard 101/102/104 keyboard or
another 8042-compatible device,
such as an external numeric
keypad, an OCR, or a bar-code
reader. Input from both the matrix
and the external device is
multiplexed and presented to the
system as if it were coming from a
single source.
6
_RESET
1
40
VCC
_IRQ
2
39
OSCI
VX
3
38
OSCO
NL
4
37
EKC1
R6
5
36
R7
RP
6
35
SL
KD
7
34
R5
KC
8
33
R4
EKC
9
32
R3
EKD
10
31
R2
The DeskCoderTM is ideal for use in
low-power, low-cost and highreliability AT / PS/2 - compatible
keyboard designs.
CL
11
30
R1
C0
12
29
R0
C1
13
28
C8
C2
14
27
C9
C3
15
26
C10
C4
16
25
C11
Note: A version of the IC that
supports the PC/XT protocol is also
available. Contact Semtech for
more information.
C5
17
24
C12
C6
18
23
C13
C7
19
22
C14
VSS/GND
20
21
C15
7
1
12
PLCC
17
18
23
40
39
34
29
28
R6
RP
KD
KC
EKC
EKD
CL
C0
C1
C2
C3
1
QFP
C4
C5
C6
C7
NC
VSS/GND
C15
C14
C13
C12
NC
DIP
RP
KD
KC
EKC
EKD
CL
C0
C1
C2
C3
C4
DeskCoder and KeyCoder are trademarks of
Semtech Corporation. All other trademarks
belong to their respective companies.
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
1
R7
SL
R5
R4
R3
R2
R1
R0
C8
C9
C10
C4A
C5
C6
C7
VSS/GND
NC
C15
C14
C13
C12
C11
The DeskCoderTM keyboard encoder
functions as a versatile, low-power
desktop keyboard encoder, while
providing two bi-directional
channels for communication with a
BIOS-compatible system as well as
any optional keyboard-compatible
devices, such as a 101/102/104
desktop keyboard, OCR, barcode
reader, etc.
FEATURES
NL
VX
_IRQ
_RESET
NC
NC
VCC
OSCI
OSCO
EKC1
R7
DESCRIPTION
www.semtech.com
NL
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
1.27
0.8
TA = -40°C to +85°C
UR5HC418-P
UR5HC418-FN
UR5HC418-FB
FUNCTIONAL DIAGRAM
NL/CL/SL
3
Data Buffer
Status LEDs
R0-R7
Row Data Inputs
EKC1
Interrupt Control
8
Column Select
Ouputs
C0-C15
16
Keyboard Encoder
KC
KD
PC
Communication
Channel
16-Bit Timer
Mode Control
EKC
EKD
8042 Emulation
(External Keyboard)
Communication
Channel
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
KT
2
DRV
www.semtech.com
FUNCTIONAL DESCRIPTION
The DeskCoder consists
functionally of seven major sections
shown in the functional diagram on
the previous page: the keyboard
encoder, a 16-bit timer, the mode
control unit, the data buffer, the
interrupt control, the PC communication channel and the 8042
emulation channel. All sections
communicate with each other and
operate concurrently.
TM
KEYBOARD ENCODER
The controller continuously scans a
keyboard organized as an 8 row by
16 column matrix for a maximum of
128 keys. Smaller-size keyboards
are supported provided that all
unused row lines are pulled to Vcc.
The controller selects one of the 16
column lines (C0-C15) every 512
microseconds 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 found pressed 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 communication channel.
PIN DEFINITIONS
Mnemonic
VCC
VSS (GND)
OSCI
OSCO
_RESET
EKC1
VX
VXA
RP
KC
KD
DIP PLCC
40
44
20
22
39
43
38
42
1
1
37
41
Type
I
I
I
O
I
I
43
6
8
4
3
7
9
2
4
I
I
I
I/O
7
8
3
I/O
EKD
10
11
6
I/O
EKC
9
10
5
I/O
_IRQ
2
2
42
I/O
29-34
5
36
32-37
6
39
40
13-17
19-21
31-24
27-32
1
34
I
I
I
I
O
O
O
O
O
O
O
O
R0-R5
R6
R7
R7A
C0-C4
C5-C7
C8-C15
C4A
CL
NL
SL
NC
3
QFP
38
17
37
36
41
35
12-16
17-19
28-21
11
4
35
18
12
5
38
23
8-12
13-15
26-23
21-18
7
44
33
39-40
16, 22
Name and Function
Power Supply: +5V
Ground
Oscillator input
Oscillator output
Reset: apply 0V to provide orderly start-up
External Keyboard Clock 1:connects
to external keyboard clock line and is used
to generate an interrupt for every clock line
transmission
Tie to VCC
Tie to VCC
Tie to VCC
Keyboard Clock: connects to
PC keyboard port clock data line
Keyboard Data: connects to PC port
data line
External Keyboard Data: connect to
external keyboard data line
External Keyboard Clock: connects
to external keyboard clock line
Interrupt Line: reserved for low power
applications
Row Data Inputs
Column Select Outputs: select one of
16 columns
Caps Lock LED
Num Lock LED
Scroll Lock LED
No Connects: these pins are unused
Note: An underscore before a pin mnemonic denotes an active low signal.
KEYBOARD ENCODER, (CON’T)
Status LED indicators
Scan Code Table Sets
The controller provides an interface
for three LED shift status indicators.
All three pins are active low to
indicate the status of the host
system (Num Lock, Caps Lock and
Scroll Lock) and are set by the
system.
The UR5HC418 supports all three scan code table sets. Scan code table
set 3 allows the user to program individual key attributes such as
make/break and Typematic or single-touch action. For more information,
refer to the IBM Technical Reference Manuals. Custom scan code tables,
including macros, are also available.
Switch Matrix Encoding
Each matrix location is programmed to represent either a single key or a
key combination of the IBM 101/102/104 standard keyboard.
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
3
www.semtech.com
SPECIAL HANDLING
MODE CONTROL
Connection of External
Device
N-Key Rollover
The DeskCoderTM detects the
presence of an external device. If
an external keyboard or other
device is not connected at power-on
and is connected at a later time, the
encoder proceeds with the normal
reset routine in order to properly
initialize the external device. After
communication has been
established, the encoder continues
to check for the presence of the
external device. If the device is
disconnected at a later time, the
encoder becomes aware of it. If a
subsequent connection takes place,
the controller re-initiates a reset
sequence. This unique feature
allows the user to connect or
disconnect an external device at
any time without having to reset the
system.
Shift Status LEDs
Shift Status LEDs (Num Lock, Caps
Lock and Scroll Lock) indicate the
status of the system and are
controlled by commands sent from
the system. Set/Reset Status
Indicator Commands from the
system will be executed both by the
external keyboard and the scanned
matrix.
In this mode, the code(s) corresponding to each key press are transmitted
to the host system as soon as that key is debounced, independently of the
release of other keys.
If a key is defined to be Typematic, the corresponding make code(s) are
transmitted while the key is held pressed. When a key is released, the
corresponding break code(s) are then transmitted to the host system. If the
released key happens to be the most recently pressed, then Typematic
action is terminated. There is no limitation in the number of keys that can
be held pressed at the same time. However, two or more key closures,
occurring within a time interval less than five mS, set an error flag and are
not processed. This procedure protects against effects of accidental key
presses.
“Ghost” Keys
In any scanned contact switch matrix, whenever three keys defining a
rectangle on the switch matrix are pressed at the same time, a fourth key
positioned on the fourth corner of the rectangle is sensed as being
pressed. This is known as the “ghost” or “phantom” key problem. Although
the problem cannot be totally eliminated without using external hardware,
there are methods to neutralize its negative effects for most practical
applications. Keys that are intended to be used in combinations or are
likely to be pressed at the same time by a fast typist (i.e., keys located in
adjacent positions on the keyboard) should be placed in the same row or
column of the matrix whenever possible. Shift Keys (Shift, Alt, Ctrl) should
not reside in the same row (or column) with any other keys.
The DeskCoderTM has built-in
mechanisms to detect the presence of
a “ghost” key, thus eliminating the
necessity of external hardware.
“Ghost”
Key
For example, if the user presses the
Caps Lock Key on either keyboard,
the Caps Lock LED will be effected
on both keyboards. The LED status
indicators are properly set after
each new connection of an external
keyboard.
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
Actual key presses
Figure 1: “Ghost” or “Phantom” Key
Problem
4
www.semtech.com
8042 EMULATION CHANNEL
PC COMMUNICATION
The DeskCoder fully emulates a
system’s keyboard port, available to
a standard 84/85/101/102 external
keyboard or other 8042-compatible
device. Communication with a
keyboard-compatible device is
accomplished by clock and data
lines via EKC and EKD pins,
respectively. A third pin, EKC1 that
connects to the clock line, interrupts
the controller whenever the external
device initiates a communication
session. When power is first
applied, the controller proceeds
with the standard reset sequence
with the external device. Data and
commands initiated from the
external device are buffered in the
controller’s FIFO along with data
from the scanned matrix, and then
are presented to the system as if
they were coming from a single
source. Once they are
acknowledged, commands and
data from the system are then
transmitted to the external device.
The DeskCoderTM 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. In addition, the
DeskCoderTM supports all
commands from and to the system,
as described in the IBM Technical
Reference Manuals.
The following table shows the
commands that the keyboard may
send to the system.
The following table shows the
commands that the system may
send and their values in
hexadecimal.
TM
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)
Command
Key Detection
Error/Overrun
5
00*
Keyboard ID
83AB
BAT Completion Code
AA
BAT Failure Code
FC
Echo
EE
Acknowledge (Ack)
FA
Resend
FE
Key Detection
Error/Overrun
FF**
*Code Sets 2 and 3
**Code Set 1
Table 3: Keyboard Commands to the
System (AT/PS/2 protocol)
When an external keyboard is
connected, commands from the
system are also directed to the
external keyboard. Presence or
absence of an external device does
not affect the normal operation of
the UR5HC418.
These commands are supported in
the AT / PS/2 protocol and can be
sent to the keyboard at any time.
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
Hex Value
www.semtech.com
STANDARD KEY MAP
Columns (C0–C15)
7
8
9
10
11
12
13
14
Space LWin
`
(BkQt)
Ins
Del
LArr
DnArr
LSft
RArr
Pad /
Pad 9 Pad Ent
X
.
/
Key45* UpArr RSft
End
Pad *
Pad 8 Pad -
0
1
2
3
4
0
LCtrl
Esc
Tab
LAlt
1
RCtrl
F1
Z
RAlt
5
6
C
15
Rows (R0–R7)
(per)
2
1
CpsLk
V
B
N
M
(com)
,
,
(appos)
Ent
PgDn
Pad 1
Pad 7 Win App
3
F2
A
S
D
F
J
K
L
;
PgUp
Pad 2
F11
4
2
3
4
T
Y
U
I
O
P
BkSpc Pad 3
F12
F4
F5
F6
F7
F8
F9
F10
NumLk ScrlLk
PntScr Pad 4
Pad 0
F3
5
6
7
8
9
0
(dash)
=
Pause Pad 5
Pad .
Q
W
E
R
G
H
[
\
Home Pad 6
Pad +
5
6
]
RWin
7
*Note: Key 45 = Additional European Key
KEYBOARD LAYOUT, DEFAULT
The UR5HC418 implements a standard keyboard layout. (Key numbering of a standard 101/102/104 keyboard is
shown.)
ES C
~
`
Ta b
!
1
SF1
SF2
SF3
SF4
@
2
#
3
$
4
%
5
Q
W
E
SF5
SF6
^
6
R
SF7
&
7
T
SF8
*
8
Y
(
9
U
SF9
SF10
_
-
+
=
)
0
I
O
{
[
P
SF11
SF12
Sc rol l
Loc k
Pa us e
Ins e rt
Hom e
Pa ge
Up
Num
Loc k
De l e t e
End
Pa ge
Down
/
*
7
0
8
0
9
0
4
0
5
0
6
0
|
\
1
0
2
0
3
0
C t rl
0
In s
B a c ks pa c e
}
]
Pri nt
Sc r.
ESC
-
+
Ca p s
Lock
Sh i f t
A
S
Z
D
X
F
C
G
V
H
B
J
N
K
M
:
;
L
>
,
>
.
"
'
?
/
Shi ft
Enter
Ctr l
Al t
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
Space
Al t
6
www.semtech.com
.
De l
IMPLEMENTATION NOTES FOR THE UR5HC418
The following notes pertain to the suggested schematics found on the next
pages.
The built-in oscillator on the UR5HC418 requires the attachment of the 4.00
MHz ceramic resonators with built-in load capacitors. You can use either an
AVX, part number PBRC-1.00 BR; or a Murata part number CSTCC4.00MG
ceramic resonator.
It may also be possible to operate with the 4.00 MHz crystal, albeit with
reduced performance. Due to their high Q, the crystal oscillator circuits
start-up slowly. Since the DeskCoderTM constantly switches the clock on and
off, it is important that a ceramic resonator is used (it starts up much quicker
than the crystal). Resonators are also less expensive than crystals.
Also, if crystal is attached, two load capacitors (33pF to 47pF) should be
added, a capacitor between each side of the crystal and ground.
In both cases, using ceramic resonator with built-in load capacitors, or
crystal with external load capacitors, a feedback resistor of one MegaOhm
should be connected between OSCin and OSCout.
Troubleshoot the circuit by looking at the output pin of the oscillator. If the
voltage it half-way between supply and ground (while the oscillator should
be running) --- the problem is with the load caps / crystal. If the voltage it all
the way at supply or ground (while the oscillator should be running) --- there
are shorts on the PCB.
Note: when the oscillator is intentionally turned off, the voltage on the output
pin of the oscillator is high (at the supply rail).
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
7
www.semtech.com
SUGGESTED INTERFACING FOR THE UR5HC418
Vcc
Vcc
100K
STATUS LEDs
Vcc
1uF
GND
Vcc
1
44
RST
4.7K 4.7K
2K
5
Vcc
12
NL
CL
38
SL
2K
EKDAT
11
EKD
EKBCLK
10
EKC
41
EKC1
8042
EMULATION
PORT
COLUMN
SELECT
OUTPUTS
Vcc
2
IRQ
KBCLK
9
KC
KBDAT
8
KD
44 Pin PLCC
PC KEYBOARD
PORT
COMMUNICATIONS
4 X 47pF
ROW
DATA
INPUTS
GND
23
NC
LINE INTERFACE
OSCI
OSCO
43
42
1 MEG
4.00 MHz
Vss
22
RP VXA
7
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
C4A
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
CS15
CS14
CS13
CS12
CS11
CS10
CS9
CS8
CS7
CS6
CS5
CS4
CS3
CS2
CS1
CS0
TO SWITCH MATRIX
RDAT7
RDAT6
RDAT5
RDAT4
RDAT3
RDAT2
RDAT1
RDAT0
VX
3
4
Vcc Vcc
Vcc
Vcc
GND
8 x 22K
GND
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
8
www.semtech.com
ALTERNATE SCHEMATIC FOR THE UR5HC418 WITH RESET CIRCUIT
Vcc
Vcc
2
STATUS LEDs
1
Telecom TC54VC4502ECB
3
Vcc
GND
Vcc
1
44
RST
4.7K 4.7K
2K
5
Vcc
12
NL
CL
38
SL
2K
EKDAT
11
EKD
EKBCLK
10
EKC
41
EKC1
8042
EMULATION
PORT
COLUMN
SELECT
OUTPUTS
Vcc
2
IRQ
KBCLK
9
KC
KBDAT
8
KD
44 Pin PLCC
PC KEYBOARD
PORT
COMMUNICATIONS
4 X 47pF
ROW
DATA
INPUTS
GND
23
NC
LINE INTERFACE
OSCI
OSCO
43
42
1 MEG
4.00 MHz
Vss
22
RP VXA
7
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
C4A
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
CS15
CS14
CS13
CS12
CS11
CS10
CS9
CS8
CS7
CS6
CS5
CS4
CS3
CS2
CS1
CS0
TO SWITCH MATRIX
RDAT7
RDAT6
RDAT5
RDAT4
RDAT3
RDAT2
RDAT1
RDAT0
VX
3
4
Vcc Vcc
Vcc
Vcc
GND
8 x 22K
GND
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
9
www.semtech.com
MECHANICALS FOR THE UR5HC418-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 ©1997-2001 Semtech Corporation
DOC5-418-DS-109
10
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 UR5HC418-FN
Y BRK
N
D
L
44
Leads
PLCC
0.18 (0.007) M T N S -P S L S -M S
B
M
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
M
T L S -M S N S -P S
T N S -P S L S -M S
Detail S
0.010 (0.004)
Detail S
T
0.25 (0.010)
M
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 ©1997-2001 Semtech Corporation
DOC5-418-DS-109
11
DIM
A
B
C
E
F
G
H
J
K
R
U
V
W
X
Y
Z
G1
K1
Z1
www.semtech.com
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
MECHANICALS FOR THE UR5HC418-FB
L
23
B
L
Detail A
44
V
B
H A-B S
B
Detail A
12
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
E
H
Datum
Plane
0.01 (0.004)
G
M
H
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
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
M
A
D S
D S
22
0.20 (0.008)
34
0.20 (0.008) M C A-B S
0.05 (0.002) A-B
33
12
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
www.semtech.com
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
UR5HC418-XX
Storage Temperature Range
Thermal Characteristics
Characteristic
Thermal Resistance
Plastic DIP
Cerdip
PLCC
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
Value
Unit
°C per W
Tstg
Symbol
Tja
°C
60
-60
70
DC Electrical Characteristics (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature
Characteristic
Symbol
Min
Output Voltage (I load<10µA)
Vol
Voh
Vdd–0.1
Output High Voltage (I load=0.8mA)
Voh
Vdd–0.8
Output Low Voltage (I load=1.6mA)
Vol
Input High Voltage
Vih
0.7xVdd
Input Low Voltage
Vil
Vss
User Mode Current
Ipp
Data Retention Mode
Vrm
2.0
Supply Current (Run)
Idd
I/O Ports Hi-Z Leakage Current
Iil
Input Current
Iin
I/O Port Capacitance
Cio
range=T low to T high unless otherwise noted)
Typ
Max
Unit
0.1
V
5
4.7
8
0.4
Vdd
0.2xVdd
10
7.0
+/-10
+/- 1
12
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
Crystal Oscillator Startup Time
fop
Crystal (fosc/2)
2.0
External Clock Option
dc
2.0
Cycle Time
tcyc
500
Crystal Oscillator Startup Time
toxov
100
Stop Recovery Startup Time
tiLCH
100
8
Reset Pulse Width
tRL
Interrupt Pulse Width Low
tLIH
125
Interrupt Pulse Period
tiLIL
*
90
tOH, TOL
OSC1Pulse Width
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
13
www.semtech.com
V
V
V
V
mA
V
mA
µA
µA
pF
Unit
MHz
MHz
ns
ms
ms
tcyc
ns
tcyc
ns
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
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, DeskCoder are trademarks of Semtech Corporation.
Semtech is a registered trademark of Semtech Corporation. 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 ©1997-2001 Semtech Corporation
DOC5-418-DS-109
14
www.semtech.com