HDLX-1414 Series
Four Character Smart Alphanumeric Displays
Data Sheet
ESD Warning: Standard CMOS Handling Precautions should be observed with the HDLX-1414.
Description
These are 3.7 mm (0.145 inch) four character 5 x 7 dot matrix
displays driven by an on-board CMOS IC. These displays are
pin for pin compatible with the HPDL-1414. The IC stores and
decodes 7-bit ASCII data and displays it in an easy to read
5 x 7 font. Multiplexing and LED drive circuitry is also
included in the display, and fast setup and hold times
allow it to interface easily with common microprocessors.
The address and data inputs can be directly connected to
microprocessor address and data buses.
The HDLX-1414 o ers a larger character set than the
HPDL-1414. Lower case letters and special symbols
are now o ered, made possible by the 5 x 7 dot matrix
character layout.
The di erence between the sunlight viewable HDLS-1414
and the low power HDLU-1414 lies in the brightness level.
The sunlight viewable version is internally set to provide
high intensity characters. The low power version uses
the same bright LED technology, but reduces the current
through each LED to a much lower level, and maintains an
intensity comparable to the HDLO-1414.
Devices
AlGaAs Red High E ciency Red Orange Yellow Green
HDLS-1414 (sun. view.) HDLO-1414 HDLA-1414 HDLY-1414 HDLG-1414
HDLU-1414 (low power)
Features
Dot matrix replacement of HPDL-1414
Smart alphanumeric display
Built-in RAM, ASCII decoder, and LED drive circuitry
128 ASCII character set
End stackable
Categorized for luminous intensity; Yellow and Green
categorized for color
Low power and sunlight viewable AlGaAs versions
Wide viewing angle (50° typical)
2
Absolute Maximum Ratings
Parameter Symbol Min. Typ. Max. Units
Supply Voltage, VDD to Ground[1] –0.5 7.0 V
Input Voltage, Any Pin to Ground –0.5 +0.5 V to VDD
Free Air Operating Temperature Range TA –40 +85 °C
Storage Temperature TS –40 +100 °C
CMOS IC Junction Temperature +150 °C
Relative Humidity (Noncondensing) at +65°C 85%
Soldering Temperature, [1.59 mm (0.063 in.) Below Body]
Solder Dipping 260°C for 5 secs
Wave Soldering 250°C for 3 secs
ESD Classi cation, R = 1.5 k, C = 100 pF Class 1 (0 – 1999 V)
Note:
1. Maximum Voltage is with no LEDs illuminated.
Package Dimensions
17.66
(0.695)
4.45
(0.175)
20.12
(0.792)
9.14
(0.360)
0.51 ± 0.13
(0.020 ± 0.005) TYP.
6.10
(0.240)
2.54
(0.100) TYP.
15.30
(0.600)
0.25 ± 0.13
(0.010 ± 0.005) TYP.
DIMENSIONS ARE IN MILLIMETERS (INCHES).
PIN 1 IDENTIFIER
4.10
(0.160)
HDLX-1414
YYWW X Z
PART NUMBER
LUMINOUS INTENSITY
COLOR BIN [3]
DATE CODE (YEAR, WEEK)
0.39
(0.015) TYP.(2X)
PIN 1
TYP.
PIN NO. FUNCTION PIN NO. FUNCTION
1
2
3
4
5
6
7
8
9
10
11
12
GROUND
D0 DATA INPUT
D1 DATA INPUT
D2 DATA INPUT
D3 DATA INPUT
D6 DATA INPUT
D5 DATA INPUT
D4 DATA INPUT
WR WRITE
A1 DIGIT SELECT
A0 DIGIT SELECT
VDD
3
Character Set
ASCII
CODE
D0
D1
D2
D3
HEX
0
0
0
0
0
D6 D5 D4
1
0
0
0
1
0
1
0
0
2
1
1
0
0
3
0
0
1
0
4
1
0
1
0
5
0
1
1
0
6
1
1
1
0
7
0
0
0
1
8
1
0
0
1
9
0
1
0
1
A
1
1
0
1
B
0
0
1
1
C
1
0
1
1
D
0
1
1
1
E
1
1
1
1
F
000 0
001 1
010 2
011 3
100 4
101 5
110 6
111 7
NOTES: 1 = HIGH LEVEL
0 = LOW LEVEL
4
Recommended Operating Conditions
Parameter Symbol Min. Typ. Max. Units
Supply Voltage VDD 4.5 5.0 5.5 V
Electrical/Optical Characteristics over Operating Temperature Range
4.5 < VDD < 5.5 V (unless otherwise speci ed)
-25°C[1]
Parameter Symbol Min. Typ. Max. Max. Units Test Conditions
Blank Current IDD (blnk) 1.0 4.0 mA All Digits Blanked
Input Current II –40 10 A VIN = 0 V to VDD
V
DD = 5.0 V
Input Voltage High VIH 2.0 VDD V
Input Voltage Low VIL GND 0.8 V
IDD 4 Digits IDD (#) 110 130 160 mA “#” ON in All Four Locations
20 dots/character[2,3]
Notes:
1. VDD = 5.0 V.
2. Average IDD measured at full brightness. Peak IDD = 28/15 x Average IDD (#).
3. IDD (#) max. = 130 mA, 150°C IC junction temperature and VDD = 5.5 V.
Optical Characteristics at 25°C[1]
VDD = 5.0 V at Full Brightness
AlGaAs Red HDLS-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous Intensity per Digit, IV 4.0 12.7 mcd “*” Illuminated in All Four Digits.
Character Average 19 Dots ON per Digit.
Peak Wavelength PEAK 645 nm
Dominant Wavelength[2] D 637 nm
AlGaAs Red HDLU-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous Intensity per Digit, IV 1.2 3.1 mcd “*” Illuminated in All Four Digits.
Character Average 19 Dots ON per Digit.
Peak Wavelength PEAK 645 nm
Dominant Wavelength[2] D 637 nm
5
High E ciency Red HDLO-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous Intensity per Digit, IV 1.2 3.5 mcd “*” illuminated in All Four Digits.
Character Average 19 Dots ON per Digit.
Peak Wavelength PEAK 635 nm
Dominant Wavelength[2] D 626 nm
Orange HDLA-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous Intensity per Digit, IV 1.2 3.5 mcd “*” Illuminated in All Four Digits.
Character Average 19 Dots ON per Digit.
Peak Wavelength PEAK 600 nm
Dominant Wavelength[2] D 602 nm
Yellow HDLY-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous Intensity per Digit, IV 1.2 3.7 mcd “*” Illuminated in All Four Digits.
Character Average 19 Dots ON per Digit.
Peak Wavelength PEAK 583 nm
Dominant Wavelength[2] D 585 nm
Green HDLG-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous Intensity per Digit, IV 1.2 5.6 mcd “*” Illuminated in All Four Digits.
Character Average 19 Dots ON per Digit.
Peak Wavelength PEAK 568 nm
Dominant Wavelength[2] D 574 nm
Notes:
1. Refers to the initial case temperature of the device immediately prior to the light measurement.
2. Dominant wavelength, D, is derived from the CIE chromaticity diagram, and represents the single wavelength which de nes the color of the
device.
6
AC Timing Characteristics over Operating Temperature Range at VDD = 4.5 V
Parameter Symbol Min. Units
Address Setup tAS 10 ns
Address Hold tAH 40 ns
Data Setup tDS 50 ns
Data Hold tDH 40 ns
Write Time tW 75 ns
Enlarged Character FontTiming Diagram
tAS
tW
tAH
2.0 V
0.8 V
2.0 V
0.8 V
2.0 V
0.8 V
tDS tDH
A0 – A1
WR
D0 – D6
0.51 (0.020)
TYP.
3.61 (0.142)
TYP.
0.56 (0.022)
TYP.
0.25 (0.010)
TYP.
2.29 (0.090)
TYP.
NOTES:
1. UNLESS OTHERWISE SPECIFIED, THE TOLERANCE ON
ALL DIMENSIONS IS ± 0.254 mm (0.010").
2. DIMENSIONS ARE IN MILLIMETERS (INCHES).
7
Display Internal Block Diagram
Figure 2 shows the HDLX-1414 display internal block
diagram. The CMOS IC consists of a 4 x 7 Character RAM,
a 128-character ASCII decoder and the refresh circuitry
necessary to synchronize the decoding and driving of four
5 x 7 dot matrix characters.
Four 7-bit ASCII words are stored in the Character RAM.
The IC reads the ASCII data and decodes it vita the
128-character ASCII decoder. This decoder includes the
64-character set of the HPDL-1414, 32 lower case ASCII
symbols, and 32 foreign language symbols.
Data Entry
Figure 1 shows a truth table for the HDLX-1414 display.
Address inputs A0 and A1 are used to select the digit
location in the display. When A0 and A1 are both logic low,
data is loaded into the right most character.
Data inputs D0–D6 are used to load information into the
display. Data is latched into the given character address on
the rising edge of the \WR signal. Data and Address inputs
must be held stable during the write cycle to ensure that
correct data is stored in the display.
Mechanical and Electrical Considerations
The HDLX-1414 is a 12-pin DIP package that can be
stacked to create a character array of any size. The display
is designed to operate reliably in –40˚C to +85˚C ambient
temperatures.
Electrical Description
Pin Function Description
\Write (\WR, Pin 3) WR must be logic 0 to store data in the display.
Address Inputs A0 and A1 select a speci c location in the display memory. Address 00 accesses the far right
(A1 and A0, Pins 4 and 5) character, and address 11 accesses the far left position.
VDD (Pin 6) VDD is the positive power supply input.
Ground (GND, Pin 7) Ground is the display ground.
Data Inputs D0–D6 are used to specify the input data for the display.
(D0–D6, Pins 1, 2, 8-12)
The HDLX-1414 is assembled by die attaching and wire
bonding 140 LEDs and a CMOS IC to a high tempera-
ture printed circuit board. A polycarbonate lens is placed
over the PC board, creating a protective air gap over the
LED wire bonds. Back ll epoxy environmentally seals the
display package. This package construction makes the
display highly tolerant to temperature cycling and allows
wave soldering.
ESD and Latchup Protection
The inputs to the CMOS IC are protected against static
discharge and input current latchup. However, for best
results, standard CMOS handling precautions should be
used. Prior to use, the HDLX-1414 should be stored in
antistatic tubes or conductive material. During assembly
a grounded conductive work area should be used, and
assembly personnel should wear conductive wrist straps.
Lab coats made of synthetic material should be avoided
since they are prone to static charge build-up. Input
current latchup can be caused when the CMOS inputs are
subjected either to a voltage below ground (Vin < ground)
or higher than VDD (Vin > VDD) and when a high current is
forced into the input. To prevent input current latchup and
ESD damage, unused inputs should be connected either
to ground or to VDD. Voltages should not be applied to the
inputs until VDD has been turned on, and high transient
input voltages should be eliminated.
\WR A1 A0 D6 D5 D4 D3 D2 D1 D0 Function
1 X X X X X X X X X No Change
0 0 0 Digit 0 ASCII Data (Right Most Character)
0 0 1 Digit 1 ASCII Data
0 1 0 Digit 2 ASCII Data
0 1 1 Digit 3 ASCII Data (Left Most Character)
0 = Logic 0; 1 = Logic 1; X = Do Not Care.
Figure 1. Display truth table.
Write to
Character
RAM
8
Figure 2. Display internal block diagram.
Soldering Instructions
The HDLX-1414 is compatible with hand- and wave-solder
processes. The use of a no-clean ux is recommended.
The polycarbonate lens on these displays is incompatible
with some uxes and cleaning solutions. It is not rec-
ommended for use with heated Terpene, or solutions
of propylene glycol monomethyl ether and monoetha-
nolamine.
For further information on soldering and post-solder
cleaning, see Application Note 1027, Soldering LED
Components.
Contrast Enhancement
The objective of contrast enhancement is to provide good
readability in the end user’s ambient lighting conditions.
By using both luminance (brightness) and chrominance
(color) contrast techniques, the ON dots of the display can
be made to stand out against a dark background.
For further information on contrast enhancement, see
Application Note 1015, Contrast Enhancement Techniques
for LED Displays.
CHARACTER RAM ASCII DECODER
WRITE
ADDRESS
A0 – A12
D0 – D67DATA IN
DATA
OUT
7CHARACTER
SELECT
COLUMN
DATA
5
3ROW
SELECT
OSC + 32 + 7
ROW
DRIVERS
DISPLAY
COLUMN
DRIVERS
ROW
SELECT
WRITE
(4 x 7)
WR
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Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2012 Avago Technologies. All rights reserved. Obsoletes 5989-3191EN
AV02-3611EN - June 12, 2012
Intensity Bin Limits for HDLS-1414
Intensity Range (mcd)
Bin Min. Max.
E 3.97 6.79
F 5.55 9.50
G 7.78 13.30
H 10.88 18.62
I 15.24 26.07
J 21.33 36.49
Note:
Test conditions as speci ed in Optical Characteristic table.
Color Bin Limits
Color Range (nm)
Color Bin Min. Max.
Green 1 576.0 580.0
2 573.0 577.0
3 570.0 574.0
4 567.0 571.5
Yellow 3 581.5 585.0
4 584.0 587.5
5 586.5 590.0
6 589.0 592.5
Note:
Test conditions as speci ed in Optical Characteristic table.
Intensity Bin Limits for HDLX-1414
Intensity Range (mcd)
Bin Min. Max.
A 1.20 1.77
B 1.45 2.47
C 2.02 3.46
D 2.83 4.85
E 3.97 6.79
F 5.55 9.50
G 7.78 13.30
Note:
Test conditions as speci ed in Optical Characteristic table.
