Page 1
DeskCoderTMUR5HC418
AT / PS/2 - Compatible
Keyboard Encoder
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
www.semtech.com
1
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTMFAMILY
DESCRIPTION FEATURES
• Desktop computers
• Instrumentation
• Industrial keyboards
• Point of sales terminals
• Public information kiosks
The DeskCoderTMkeyboard 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.
The DeskCoderTMfully 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.
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.
The DeskCoderTMis ideal for use in
low-power, low-cost and highreliability AT / PS/2 - compatible
keyboard designs.
Note: A version of the IC that
supports the PC/XT protocol is also
available. Contact Semtech for
more information.
• 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
• 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
APPLICATIONS
PIN ASSIGNMENTS
_RESET
_IRQ
EKC
EKD
VSS/GND
1
2
VX
3
NL
4
R6
5
RP
6
KD
7
KC
8
9
10
CL
11
C0
12
C1
13
C2
14
C3
15
C4
16
C5
17
C6
18
C7
19
20
DIP
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
R6NLVX
VXA
_IRQ
_RESET
VCC
OSCI
OSC0
EKC1
C15
VCC
C15
VSS/GND
C14
OSCI
C14
C13
OSCO
C13
C12
EKC1
C12
R7A
40
39
R7
SL
R5
R4
R3
R2
34
R1
R0
C8
C9
C10
29
28
C11
R7
NL
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
NC
VCC
OSCI
OSCO
EKC1
R7
SL
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
C12
C13
C14
C15
EKC
EKD
RP
KD
KC
CL
C0
C1
C2
C3
C4
EKC
EKD
6
C5C6C7
C4A
NLVX_IRQ
1
C4C5C6
1
PLCC
23
NC
VSS/GND
_RESETNCNC
QFP
C7
NC
7
12
17
18
R6
RP
KD
KC
CL
C0
C1
C2
C3
Page 2
FUNCTIONAL DIAGRAM
ORDERING CODE
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
2
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
Data Buffer
Interrupt Control
PC
Communication
Channel
8042 Emulation
(External Keyboard)
Communication
Channel
EKC1
KC
KD
EKC
EKD
Keyboard Encoder
Mode Control
Status LEDs
Row Data Inputs
Column Select
Ouputs
NL/CL/SL
3
8
16
KT
DRV
16-Bit Timer
R0-R7
C0-C15
Page 3
FUNCTIONAL DESCRIPTION PIN DEFINITIONS
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
3
The DeskCoderTMconsists
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.
Mnemonic DIP PLCC QFP Type Name and Function
VCC 40 44 38 I Power Supply: +5V
VSS (GND) 20 22 17 I Ground
OSCI 39 43 37 I Oscillator input
OSCO 38 42 36 O Oscillator output
_RESET 1 1 41 I Reset: apply 0V to provide orderly start-up
EKC1 37 41 35 I External Keyboard Clock 1:connects
to external keyboard clock line and is used
to generate an interrupt for every clock line
transmission
VX 3 4 43 I Tie to VCC
VXA 3 I Tie to VCC
RP 6 7 2 I Tie to VCC
KC 8 9 4 I/O Keyboard Clock: connects to
PC keyboard port clock data line
KD 7 8 3 I/O Keyboard Data: connects to PC port
data line
EKD 10 11 6 I/O External Keyboard Data: connect to
external keyboard data line
EKC 9 10 5 I/O External Keyboard Clock: connects
to external keyboard clock line
_IRQ 2 2 42 I/O Interrupt Line: reserved for low power
applications
R0-R5 29-34 32-37 27-32 I Row Data Inputs
R6 5 6 1 I
R7 36 39 34 I
R7A 40 I
C0-C4 12-16 13-17 8-12 O Column Select Outputs: select one of
C5-C7 17-19 19-21 13-15 O 16 columns
C8-C15 28-21 31-24 26-23 O
21-18 O
C4A 18 O
CL 11 12 7 O Caps Lock LED
NL 4 5 44 O Num Lock LED
SL 35 38 33 O Scroll Lock LED
NC 23 39-40 No Connects: these pins are unused
16, 22
Note: An underscore before a pin mnemonic denotes an active low signal.
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.
Status LED indicators
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.
Scan Code Table Sets
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.
KEYBOARD ENCODER
KEYBOARD ENCODER, (CON’T)
Page 4
SPECIAL HANDLING MODE CONTROL
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
4
Connection of External
Device
The DeskCoderTMdetects 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.
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.
N-Key Rollover
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 DeskCoderTMhas built-in
mechanisms to detect the presence of
a “ghost” key, thus eliminating the
necessity of external hardware.
Actual key presses
“Ghost”
Key
Figure 1: “Ghost” or “Phantom” Key
Problem
Page 5
8042 EMULATION CHANNEL PC COMMUNICATION
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
5
The DeskCoderTMfully 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 DeskCoderTMimplements 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
DeskCoderTMsupports all
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 values in
hexadecimal.
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.
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**
*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.
Page 6
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
6
STANDARD KEY MAP
Columns (C0–C15)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LCtrl Esc Tab LAlt Space LWin ` Ins Del LArr DnArr LSft RArr Pad / Pad 9 Pad Ent
(BkQt)
RCtrl F1 Z RAlt X C . / Key45* UpArr RSft End Pad * Pad 8 Pad -
(per)
1 CpsLk V B N M , , Ent PgDn Pad 1 Pad 7 Win App
(com) (appos)
F2 A S D F J K L ; PgUp Pad 2 F11 RWin
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 - = Pause Pad 5 Pad .
(dash)
Q W E R G H [ ] \ Home Pad 6 Pad +
Rows (R0–R7)
0
1
2
3
4
5
6
7
*Note: Key 45 = Additional European Key
The UR5HC418 implements a standard keyboard layout. (Key numbering of a standard 101/102/104 keyboard is
shown.)
KEYBOARD LAYOUT, DEFAULT
Print
ESC SF1 SF2 SF3 SF4 SF5 SF6 SF7 SF8 SF9 SF10
~`!1@2#3$4%5^6&7*8(
Tab
Caps
Lock
Shift
Ctrl Alt
Q W E R T Y U I O P
A S D F G H J K L
Z X C V B N M
Space
9)0_-
>,>.?
{
[
:
;
/
Alt Ctrl
"
'
+
=
SF11 SF12
Backspace
}
]
Shift
ESC
|
\
Scroll
Scr.
Lock
Insert Home
Delete End
Pause
Page
Up
Page
Down
Num
Lock
Ins
7
0
4
0
1
0
0
/ * -
809
0
506
0
203
0
.
Del
+
Enter
Page 7
IMPLEMENTATION NOTES FOR THE UR5HC418
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
7
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 DeskCoderTMconstantly 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).
Page 8
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
8
SUGGESTED INTERFACING FOR THE UR5HC418
Vcc
EKDAT
EKBCLK
KBCLK
KBDAT
4 X 47pF
Vcc
4.7K
4.7K
2K
GND
LINE INTERFACE
7
Vcc
Vcc
5
12 38
3 4
Vcc
STATUS LEDs
C15 24 CS15
C14 25 CS14
C13 26 CS13
C12 27 CS12
C11 28 CS11
C10 29 CS10
C9 30 CS9
C8 31 CS8
COLUMN
C7 21 CS7
SELECT
C6 20 CS6
OUTPUTS
C5 19 CS5
C4 17 CS4
C3 16 CS3
C2 15 CS2
C1 14 CS1
C0 13 CS0
C4A 18
R7A 40
R7 39 RDAT7
R6 6 RDAT6
ROW
R5 37 RDAT5
DATA
R4 36 RDAT4
INPUTS
R3 35 RDAT3
R2 34 RDAT2
R1 33 RDAT1
R0 32 RDAT0
Vcc
Vcc
8 x 22K
TO SWITCH MATRIX
100K
42 22
1 MEG
Vcc
441
44 Pin PLCC
GND
1uF
GND
RST Vcc NL CL SL
2K
11
EKD
10
41
Vcc
2
9
8
23
8042
EMULATION
EKC
PORT
EKC1
IRQ
KC
PC KEYBOARD
PORT
KD
COMMUNICATIONS
NC
OSCI OSCO Vss RP VXA VX
43
4.00 MHz
GND
Page 9
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
9
ALTERNATE SCHEMATIC FOR THE UR5HC418 WITH RESET CIRCUIT
Vcc
Telecom TC54VC4502ECB
Vcc
4.7K
4.7K
2K
EKDAT
EKBCLK
KBCLK
KBDAT
4 X 47pF
GND
LINE INTERFACE
2
Vcc
STATUS LEDs
1
3
GND
RST Vcc NL CL SL
2K
11
EKD
10
41
Vcc
2
9
8
23
8042
EMULATION
EKC
PORT
EKC1
IRQ
KC
PC KEYBOARD
PORT
KD
COMMUNICATIONS
NC
OSCI OSCO Vss RP VXA VX
43
1 MEG
4.00 MHz
Vcc
441
44 Pin PLCC
42 22
GND
Vcc
7
Vcc
5
12 38
COLUMN
SELECT
OUTPUTS
ROW
DATA
INPUTS
3 4
C15 24 CS15
C14 25 CS14
C13 26 CS13
C12 27 CS12
C11 28 CS11
C10 29 CS10
C9 30 CS9
C8 31 CS8
C7 21 CS7
C6 20 CS6
C5 19 CS5
C4 17 CS4
C3 16 CS3
C2 15 CS2
C1 14 CS1
C0 13 CS0
C4A 18
R7A 40
R7 39 RDAT7
R6 6 RDAT6
R5 37 RDAT5
R4 36 RDAT4
R3 35 RDAT3
R2 34 RDAT2
R1 33 RDAT1
R0 32 RDAT0
Vcc
Vcc
8 x 22K
TO SWITCH MATRIX
GND
Page 10
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
10
MECHANICALS FOR THE UR5HC418-P
40 21
1 20
A
H
G
F
D
N
Seating
Plane
B
L
C
J
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 11
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
11
MECHANICALS FOR THE UR5HC418-FN
44
(Note 1)
Z
C
+
G1
0.25 (0.010) T-LSMSNSP
M
L
(Note 1) 44
G
N
44
Leads
PLCC
Y BRK
M
D
0.18 (0.007) T LSM
B
M
NSP
S
0.18 (0.007) T L
U
S
--
M
NSP
S
-
Note 1
SMS
-
W
Z1
K1
K
D
View D-D
Detail S
H
F
X
0.18 (0.007)
0.18 (0.007)TT
0.18 (0.007)
0.18 (0.007)
M
M
M
M
DIM
G1
0.25 (0.010) T
G
H
J
K
R
U
V
W
X
Y
Z
G1
K1
Z1
M
NSP
LSMSNSP
-
-
LSM
NSP
S
-
-
LSMSNSP
T
-
-
LSM
NSP
T
S
--
MILLIMETERS INCHES
MIN
A
B
C
E
F
MAX MIN MAX
17.40 17.65
17.40
0.685
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
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
LSM
S
S
-
-
S
S
S
S
0.695
0
0
1
P
0.18 (0.007) T-LSMSNSP
A
0.18 (0.007) T-LSMSNSP
R
+
E
V
M
M
S
-
S
-
J
Detail S
S
-
0.010 (0.004)
T
Seating Plane
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
Page 12
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
12
MECHANICALS FOR THE UR5HC418-FB
L
L
A
Datum
Plane
H
Detail C
C
C
Seating
Plane
33 23
34
Detail A
44
1
D
A
M
0.20 (0.008) C
0.05 (0.002) A-B
A-B
S
S
M
0.20 (0.008) H
A-B
S
W
X
E
G
H
B
22
B
M
S
D
S
A-B
S
D
S
A-B
V
M
B
A,B,D
Detail A
0.20 (0.008) C
0.05 (0.002) A-B
12
11
S
D
S
D
JN
M
T
R
0.20 (0.008) C
Section B-B
K
Q
M
0.20 (0.008) H
Notes
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
F
Base Metal
D
M
A-B
S
S
D
M
Detail C
Datum
H
Plane
0.01 (0.004)
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
0.13
K
L
M
N
Q
R
S
T
U
V
W
X
0.23
0.65
8.00 REF 0.315 REF
0
5 10 5 10
0.17 0.005 0.007
0.13
0
0 7 0 7
0.13 .30 0.005 0.012
13.45 0.530
12.95 0.510
0.13 0.005
-
0
0
--
12.95
13.45
0.40 0.016
1.6 REF
0
0
0.390
0.390
-
0.005
0.026
0
0
0
0
0.510
0.063 REF
0.398
0.398
0.009
0.0370.95
0
0
-
0.530
--
Page 13
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
13
ELECTRICAL SPECIFICATIONS
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
UR5HC418-XX -40 to +85
Storage Temperature Range Tstg -65 to +150 ° C
Thermal Characteristics
Characteristic Symbol Value Unit
Thermal Resistance Tja °C per W
Plastic DIP 60
Cerdip -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
User Mode Current Ipp 5 10 mA
Data Retention Mode Vrm 2.0 V
Supply Current (Run) 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
Crystal Oscillator Startup Time fop MHz
Crystal (fosc/2) 2.0
External Clock Option dc 2.0
Cycle Time tcyc 500 ns
Crystal Oscillator Startup Time toxov 100 ms
Stop Recovery Startup Time tiLCH 100 ms
Reset Pulse Width t
RL
8 tcyc
Interrupt Pulse Width Low tLIH 125 ns
Interrupt Pulse Period tiLIL
* tcyc
OSC1Pulse Width
t
OH
,
TOL
90 ns
Page 14
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
www.semtech.com
14
For sales information
and product literature,
contact:
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Semtech Corporation
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hidinfo@semtech.com
http://www.semtech.com
212 226 2042 Telephone
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805-498-2111 Telephone
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+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.
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