Four Character Smart
Alphanumeric Displays
HDLX-1414 Series
Technical Data
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)
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 offers a larger
character set than the
HPDL-1414. Lower case letters
and special symbols are now
offered, made possible by the
5 x 7 dot matrix character layout.
The difference 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.
ESD Warning: Standard CMOS Handling Precautions should be observed with
the HDLX-1414.
Devices
AlGaAs Red High Efficiency Red Orange Yellow Green
HDLS-1414 (sun. view.) HDLO-1414 HDLA-1414 HDLY-1414 HDLG-1414
HDLU-1414 (low power)
2
Absolute Maximum Ratings
Supply Voltage, VDD to Ground[1] ................................. –0.5 V to 7.0 V
Input Voltage, Any Pin to Ground ........................ –0.5 V to VDD +0.5 V
Free Air Operating Temperature Range, TA................ –40˚C to +85˚C
Storage Temperature, TS.......................................... –40˚C to +100˚C
CMOS IC Junction Temperature ............................................... +150˚C
Relative Humidity (non-condensing) at +65˚C .............................. 85%
Maximum Solder Temperature, 1.59 mm
(0.063 in.) below Seating Plane, t < 5 sec. .......................... +260˚C
ESD Classification, R = 1.5 kΩ, C = 100 pF ....... Class 1 (0 – 1999 V)
Note:
1. Maximum Voltage is with no LEDs illuminated.
Package Dimensions
PIN NO. FUNCTION PIN NO. FUNCTION
1
2
3
4
5
6
7
8
9
10
11
12
GROUND
D
0
DATA INPUT
D
1
DATA INPUT
D
2
DATA INPUT
D
3
DATA INPUT
D
6
DATA INPUT
D
5
DATA INPUT
D
4
DATA INPUT
WR WRITE
A
1
DIGIT SELECT
A
0
DIGIT SELECT
V
DD
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.
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
AlGaAs Red HDLU-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous IV1.2 3.1 mcd “*” illuminated in all four digits.
Intensity per digit, 19 dots ON per digit.
Character Average
Peak Wavelength λPEAK 645 nm
Dominant λD637 nm
Wavelength[2]
Electrical/Optical Characteristics over Operating Temperature Range
4.5 < VDD < 5.5 V (unless otherwise specified).
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 µAV
IN = 0 V to VDD
VDD = 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
20 dots/character[2,3] locations
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 IV4.0 12.7 mcd “*” illuminated in all four digits.
Intensity per digit, 19 dots ON per digit.
Character Average
Peak Wavelength λPEAK 645 nm
Dominant λD637 nm
Wavelength[2]
5
High Efficiency Red HDLO-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous IV1.2 3.5 mcd “*” illuminated in all four digits.
Intensity per digit, 19 dots ON per digit.
Character Average
Peak Wavelength λPEAK 635 nm
Dominant λD626 nm
Wavelength[2]
Orange HDLA-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous IV1.2 3.5 mcd “*” illuminated in all four digits.
Intensity per digit, 19 dots ON per digit.
Character Average
Peak Wavelength λPEAK 600 nm
Dominant λD602 nm
Wavelength[2]
Yellow HDLY-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous IV1.2 3.7 mcd “*” illuminated in all four digits.
Intensity per digit, 19 dots ON per digit.
Character Average
Peak Wavelength λPEAK 583 nm
Dominant λD585 nm
Wavelength[2]
Green HDLG-1414
Parameter Symbol Min. Typ. Units Test Conditions
Average Luminous IV1.2 5.6 mcd “*” illuminated in all four digits.
Intensity per digit, 19 dots ON per digit.
Character Average
Peak Wavelength λPEAK 568 nm
Dominant λD574 nm
Wavelength[2]
Notes:
1. Refers to the initial case temperature of the device immediately prior to the light measurement.
2. Dominant wavelength, λD, is derived from the CIE chromaticity diagram, and represents the single wavelength which defines 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 tW75 ns
Enlarged Character FontTiming Diagram
t
AS
t
W
t
AH
2.0 V
0.8 V
2.0 V
0.8 V
2.0 V
0.8 V
t
DS
t
DH
A
0
– A
1
WR
D
0
– D
6
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.
Electrical Description
Pin Function Description
\Write WR must be logic 0 to store data in the
(\WR, pin 3) display.
Address Inputs A0 and A1 select a specific location in the
(A1 and A0, pins display memory. Address 00 accesses the far
4 and 5) right character, and address 11 accesses the
far left position.
VDD VDD is the positive power supply input.
(pin 6)
Ground Ground is the display ground.
(GND, pin 7)
Data Inputs D0–D6 are used to specify the input data
(D0–D6, pins 1, for the display.
2, 8-12)
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.
The HDLX-1414 is assembled by
die attaching and wire bonding
140 LEDs and a CMOS IC to a
high temperature printed circuit
board. A polycarbonate lens is
placed over the PC board,
creating a protective air gap over
the LED wire bonds. Backfill
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
\WR A1 A0 D6 D5 D4 D3 D2 D1 D0 Function
1 XXXXXXXXXNo 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)
Figure 1. Display Truth Table 0 = Logic 0; 1 = Logic 1; X = Do Not Care.
Write to
Character
RAM
8
Figure 2. Display Internal Block Diagram.
applied to the inputs until VDD
has been turned on, and high
transient input voltages should be
eliminated.
Soldering Instructions
The HDLX-1414 is compatible
with hand- and wave-solder
processes. The use of a no-clean
flux is recommended.
The polycarbonate lens on these
displays is incompatible with
some fluxes and cleaning
solutions. It is not recommended
for use with heated Terpene, or
solutions of propylene glycol
monomethyl ether and
monoethanolamine.
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.
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
For further information on
contrast enhancement, see
Application Note 1015, Contrast
Enhancement Techniques for
LED Displays.
9
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 specified in Optical Characteristic table.
Intensity Bin Limits for HDLS-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 specified in Optical Characteristic table.
Intensity Bin Limits for HDLX-1414
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 specified in Optical Characteristic table.
Color Bin Limits
www.semiconductor.agilent.com
Data subject to change.
Copyright © 2001 Agilent Technologies, Inc.
July 11, 2001
Obsoletes 5988-2802EN
5988-3270EN
