21
FEATURES
Dot Matrix Replacement for DL1414T
0.145" High, Dot Matrix Character
128 Special ASCII Characters for English,
German, Italian, Swedish, Danish, and Norwe-
gian Languages
Wide Viewing Angle: X Axis
50
, Y Axis
75
Close Vertical Row Spacing, 0.800" Centers
Fast Access Time, 110 ns at 25
C
Compact Size for Hand Held Equipment
Built- in Memory
Built-in Character Generator
Built-in Multiplex and LED Drive Circuitry
Direct Access to Each Digit Independently
and Asynchronously
TTL Compatible, 5 Volt Power
Low Power Consumption, 20 mA per Charac-
ter Typical
Intensity Coded for Display Uniformity
Extended Operating Temperature Range:
40
C to +85
C
End Stackable, 4-Character Package
DESCRIPTION
The DLR/DLO/DLG1414 is a four digit 5x7 dot matrix display module with a
built-in CMOS integrated circuit. This display is a drop-in dot matrix replace-
ment for the DL1414T with segmented characters.
The integrated circuit contains memory, ASCII ROM decoder, multiplex cir-
cuitry and drivers. Data entry is asynchronous and random. A display system
can be built using any number of DLX1414s since each character in any
DLX1414 can be addressed independently and will continue to display the
character last stored until replaced by another.
System interconnection is very straightforward. The least significant two
address bits (A0, A1) are normally connected to the like named inputs of all
displays in the system. Data lines are connected to all DLX1414s directly
and in parallel as is the write line (WR). The display then will behave as a
write only memory.
The DLX1414 has several features superior to competitive devices. The
character set consists of 128 special ASCII characters for English, German,
Italian, Swedish, Danish, and Norwegian.
See Appnotes 18, 19, 22, and 23 for additional information.
.240
(6.10)
ref.
.800
(20.32)
max.
.600
.020
(15.24
.51)
.012 (.30)
.002 (.05)
12 pl.
.210
(5.33)
Part Number
Luminous
Intensity
Code
.070 (1.78)
.003 (.08) 4 pl.
.010 (.25) 4 pl.
.240 (6.10)
EIA Date Code
DLX 1414
SIEMENS YYWW
Z
.100 (2.54) 10 pl.
at Seating Plane
Pin Indicator
.
160
.020
(4.06
.51)
.050 (1.27) 4 pl.
.095 (2.41)
ref.
.018 (.46) 12 pl.
.0920
(2.34)
.1750
(4.45)
.0200 (.51)
.1440
(3.66)
.700 max.
(17.78)
.0220
(.56)
Tolerance: XXX
.01 (.254)
Dimensions in inches (mm)
RED
DLR1414
HIGH EFFICIENCY RED
DLO1414
GREEN
DLG1414
.145" 4-character 5 x 7 Dot Matrix
Alphanumeric Intelligent Display
with Memory/Decoder/Driver
22
DLR/DLO/DLG1414
Maximum Ratings
DC Supply Voltage ....................... 0.5 to +7.0 Vdc
Input Voltage Levels Relative
to GND (all inputs) ............. 0.5 to V
CC
+0.5 Vdc
Operating Temperature ..................40
C to +85
C
Storage Temperature....................40
C to +100
C
Maximum Solder Temperature ........063" (1.59 mm)
below Seating Plane, t<5 sec. ................... 260
C
Relative Humidity at 85
C ................................85%
Optical Characteristics
Spectral Peak Wavelength
Red ................................................... 660 nm typ.
High Efficiency Red (HER) ............... 630 nm typ.
Green ................................................ 565 nm typ.
Viewing Angle (off normal axis)
Horizontal.....................................................
50
Vertical .........................................................
75
Character Height........................................... 0.145"
Time Averaged Luminous Intensity
1
(100% brightness, V
CC
=5 V)
Red ............................................ 50
cd/LED typ.
HER............................................ 60
cd/LED typ.
Green ......................................... 70
cd/LED typ.
LED to LED Intensity Matching ........... 1.8:1.0 max.
LED to LED Hue Matching at V
CC
=5 V
(Green only) .....................................
2 nm max.
Note 1: Peak luminous intensity values can be calculated
by multiplying these values by 7.
Figure 1. Top view
Figure 2. Timing characteristics
(V
CC
=4.5 V)
Pin
Function
Pin
Function
1
D5 Data Input
7
GND
2
D4 Data Input
8
D0 Data Input (LSB)
3
WR Write
9
D1 Data Input
4
A1 Digit Select
10
D2 Data Input
5
A0 Digit Select
11
D3 Data Input
6
V
CC
12
D6 Data Input (MSB)
1 2 3 4 5 6
12 11 10 9 8 7
digit digit digit digit
3 2 1 0
Note: These waveforms are not edge triggered.
T
W
T
AS
A0, A1
D0-D6
WR
T
AH
T
ACC
2.0 V
0.8 V
T
DS
T
DH
2.0 V
0.8 V
2.0 V
0.8 V
DC Characteristics
AC Characteristics
Guaranteed Minimum Timing Parameters at V
CC
=5.0 V
0.5 V
Note: 1. T
ACC
=Set Up Time + Write Time + Hold Time.
Parameter
40
C
+25
C
+85
C
Units
Conditions
Min.
Typ.
Max.
Min.
Typ. Max.
Min.
Typ. Max.
I
CC
4 Digits on
20 dots/digit
90
120
80
105
70
95
mA
V
CC
=5 V
I
CC
Blank
2.8
4.0
2.3
3.0
2.0
2.5
mA
V
CC
=WR=5 V,
V
IN
=0 V
I
IL
(all inputs)
30
60
120
25
50
100
20
40
80
mA
V
IN
=0.8 V, V
CC
=5 V
V
IH
2.0
2.0
2.0
V
V
CC
=5 V
0.5 V
V
IL
0.8
0.8
0.8
V
V
CC
=5 V
0.5 V
V
CC
4.5
5.0
5.5
4.5
5.0
5.5
4.5
5.0
5.5
V
Parameter
Symbol
40
C
+25
C
+85
C
Units
Address Set Up Time
T
AS
10
10
10
ns
Address Hold Time
T
AH
20
30
40
ns
Write Time
T
W
60
70
90
ns
Data Set Up Time
T
DS
20
30
50
ns
Data Hold Time
T
DH
20
30
40
ns
Access Time
(1)
T
ACC
90
110
140
ns
25
DLR/DLO/DLG1414
For further information refer to Appnotes 18 and 19 in the cur-
rent Siemens Optoelectronic Data Book.
An alternative to soldering and cleaning the display modules is
to use sockets. Eighteen pin DIP sockets .600" wide with .100"
centers work well for single displays. Multiple display assem-
blies are best handled by longer SIP sockets or DIP sockets
when available for uniform package alignment. Socket manu-
facturers are Aries Electronics, Inc., Frenchtown, NJ; Garry
Manufacturing, New Brunswick, NJ; Robinson-Nugent, New
Albany, IN; and Samtec Electronic Hardware, New Albany, IN.
For further information refer to Appnote 22 in the current Sie-
mens Optoelectronic Data Book.
Optical Considerations
The .145" high characters of the DLX1414 gives readability up
to eight feet. The user can build a display that enhances read-
ability over this distance by proper filter selection .
Using filters emphasizes the contrast ratio between a lit LED
and the character background. This will increase the discrimi-
nation of different characters. The only limitation is cost.
Remember to take into consideration the ambient lighting envi-
ronment for the best cost/benefit ratio for filters.
Incandescent (with almost no green) or fluorescent (with almost
no red) lights do not have the flat spectral response of sunlight.
Plastic band-pass filters are an inexpensive and effective way
to strengthen contrast ratios. The DLR1414 is a standard red
display and should be matched with long wavelength pass fil-
ter in the 600 nm to 620 nm range. For displays of multiple col-
ors, neutral density grey filters offer the best compromise.
The DLO1414 is a high efficiency red display and should be
matched with a long wavelength pass filter in the 570 nm to 590
range. The DLG1414 should be matched with a yellow-green
band-pass filter that peaks at 565 nm. For displays of multiple
colors, neutral density gray filters offer the best compromise.
Additional contrast enhancement can be gained by shading
the displays. Plastic band-pass filters with built-in louvers offer
the next step up in contrast improvement. Plastic filters can be
improved further with anti-reflective coatings to reduce glare.
The trade-off is fuzzy characters. Mounting the filters close to
the display reduces this effect. Take care not to overheat the
plastic filter by allowing for proper air flow.
Optimal filter enhancements are gained by using circular polar-
ized, anti-reflective, band-pass filters. The circular polarizing
further enhances contrast by reducing the light that travels
through the filter and reflects back off the display to less
than 1%.
Several filter manufacturers supply quality filter materials.
Some of them are: Panelgraphic Corporation, W. Caldwell, NJ;
SGL Homalite, Wilmington, DE; 3M Company, Visual Products
Division, St. Paul, MN; Polaroid Corporation, Polarizer Division,
Cambridge, MA; Marks Polarized Corporation, Deer Park, NY,
Hoya Optics, Inc., Fremont, CA.
One last note on mounting filters: recessing displays and bezel
assemblies is an inexpensive way to provide a shading effect in
overhead lighting situations. Several bezel manufacturers are:
R.M.F. Products, Batavia, IL; Nobex Components, Griffith Plas-
tic Corp., Burlingame, CA; Photo Chemical Products of Califor-
nia, Santa Monica, CA; I.E.E.-Atlas, Van Nuys, CA.
Refer to Siemens Appnote 23 for further information.
Design Considerations
For details on design and applications of the DLX1414 using
standard bus configurations in multiple display systems, or
parallel I/O devices, such as the 8255 with an 8080 or mem-
ory mapped addressing on processors such as the 8080,
Z80, 6502, 8748, or 6800, refer to Appnote 15 in the current
Siemens Optoelectronic Data Book.
Electrical & Mechanical Considerations
Voltage Transient Suppression
We strongly recommend that the same power supply be used
for the display and the components that interface with the dis-
play to avoid logic inputs higher than V
CC
. Additionally, the
LEDs may cause transients in the power supply line while
they change display states. The common practice is to place
.01 mF capacitors close to the displays across V
CC
and GND,
one for each display, and one 10 mF capacitor for every sec-
ond display.
ESD Protection
The metal gate CMOS IC of the DLX1414 is extremely
immune to ESD damage. However, users of these devices are
encouraged to take all the standard precautions, normal for
CMOS components. These include properly grounding per-
sonnel, tools, tables, and transport carriers that come in con-
tact with unshielded parts. Where these conditions are not, or
cannot be met, keep the leads of the device shorted together
or the parts in anti-static packaging.
Soldering Considerations
The DLX1414 can be hand soldered with SN63 solder using a
grounded iron set to 260
C.
Wave soldering is also possible following these conditions:
Preheat that does not exceed 93
C on the solder side of the
PC board or a package surface temperature of 85
C. Water
soluble organic acid flux (except carboxylic acid) or resin-
based RMA flux without alcohol can be used.
Wave temperature of 245
C
5
C with a dwell between 1.5
sec. to 3.0 sec. Exposure to the wave should not exceed tem-
peratures above 260
C for five seconds at 0.063" below the
seating plane. The packages should not be immersed in the
wave.
Post Solder Cleaning Procedures
The least offensive cleaning solution is hot D.I. water (60
C)
for less than 15 minutes. Addition of mild saponifiers is
acceptable. Do not use commercial dishwasher detergents.
For faster cleaning, solvents may be used. Carefully select
solvents as some may chemically attack the nylon package.
Maximum exposure should not exceed two minutes at ele-
vated temperatures. Acceptable solvents are TF (trichlorotrif-
luorethane), TA, 111 Trichloroethane, and unheated acetone.
Note: Acceptable commercial solvents are: Basic TF, Arklone P,
Genesolve D, Blaco-tron TF, Freon TA, Genesolve DA, and
Blaco-tron TA.
Unacceptable solvents contain alcohol, methanol, methylene
chloride, ethanol, TP35, TCM, TMC, TMS+, TE, or TES. Since
many commercial mixtures exist, contact a solvent vendor for
chemical composition information. Some major solvent man-
ufacturers are: Allied Chemical Corporation, Specialty Chem-
ical Division, Morristown, NJ; Baron-Blakeslee, Chicago, IL;
Dow Chemical, Midland, MI; E.I. DuPont de Nemours & Co.,
Wilmington, DE.
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