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Four Character Smart Alphanumeric Displays Technical Data
HPDL-1414 Features
* Smart Alphanumeric Display Built-in RAM, ASCII Decoder and LED Drive Circuitry * Wide Operating Temperature Range -40C to +85C * Fast Access Time 160 ns * Excellent ESD Protection Built-in Input Protection Diodes * CMOS IC for Low Power Consumption * Full TTL Compatibility Over Operating Temperature Range VIL = 0.8 V VIH = 2.0 V * Wave Solderable * Rugged Package Construction * End-Stackable * Wide Viewing Angle
Typical Applications
* * * * * * * Portable Data Entry Devices Medical Equipment Process Control Equipment Test Equipment Industrial Instrumentation Computer Peripherals Telecommunication Instrumentation
Description
The HPDL-1414 is a smart, four character, sixteen-segment, red GaAsP display. The HPDL-1414 has a character height of 2.85 mm (0.112"). The on-board CMOS IC contains memory, ASCII decoder, multiplexing circuitry and drivers. The monolithic LED characters are magnified by an immersion lens which increases both character size and luminous intensity. The encapsulated dualin-line package provides a rugged, environmentally sealed unit. The HPDL-1414 incorporates many improvements over competitive products. It has a wide operating temperature range, very fast IC access time, and improved ESD protection. The displays are also fully TTL compatible, wave solderable, and highly reliable. These displays are ideally suited for industrial and commercial applications where a good-looking, easy-to-use alphanumeric display is required.
ESD WARNING: STANDARD CMOS HANDLING PRECAUTIONS SHOULD BE OBSERVED WITH THE HPDL-1414.
Absolute Maximum Ratings
Supply Voltage, VDD to Ground ...................................... -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[1] .............. -40C to +85C Relative Humidity (non-condensing) at 65C .................................. 90% Storage Temperature, TS .............................................. -40C to +85C Maximum Solder Temperature, 1.59 mm (0.063 in.) below Seating Plane, t < 5 sec. ................................................ 260C ESD Protection @ 1.5 k, 100 pF ...................... V Z = 2 kV (each Pin)
Package Dimensions
HPDL-1414
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Recommended Operating Conditions
Parameter Supply Voltage Sym. VDD Min. 4.5 Nom. 5.0 Max. 5.5 Units V
DC Electrical Characteristics
Parameter Input Current IDD Blank IDD 4 Digits ON (10 Segments per digit)[1,2] Input Voltage High Input Voltage Low Power Dissipation[3] Sym. IIL IDD (BL) IDD VIH VIL PD Min. 25C Typ. 45 1.5 70 2.0 GND 350 25C Max. 100 2.7 90 0.8 450 Units A mA mA V V mW Test Conditions VDD = 5.0 V, VIL = 0.8 V VDD = 5.0 V, BL = 0.8 V VDD = 5.0 V
VDD = 5.0 V
Notes: 1. "%" illuminated in all four characters. 2. Measured at five seconds. 3. Power Dissipation = (VDD )(IDD ) for 10 segments ON.
Optical Characteristics at 25C[6]
Parameter Peak Luminous Intensity per Digit, 8 segments ON (character average) Peak Wavelength Dominant Wavelength Off Axis Viewing Angle Sym. IV Peak Peak d Min. 0.4 Typ. 1.0 655 640 40 Units mcd nm nm degrees Test Conditions VDD = 5.0 V, "*" illuminated in all 4 digits
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AC Timing Characteristics over Operating Temperature Range at VCC = 4.5 V
Parameter Address Setup Time Write Delay Time Write Time Data Setup Time Data Hold Time Address Hold Time Access Time Symbol tAS tWD tW tDS tDH tAH -20C tMIN 90 10 80 40 40 40 130 25C tMIN 115 15 100 60 45 45 160 70C tMIN 150 20 130 80 50 50 200 Units ns ns ns ns ns ns ns
Timing Diagram
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Character Set
Magnified Character Font Description
HPDL-1414
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Electrical Description
Display Internal Block Diagram HPDL-1414 Figure 1 shows the internal block diagram of the HPDL-1414. It consists of two parts: the display LEDs and the CMOS IC. The CMOS IC consists of a four-word ASCII memory, a 64-word character generator, 17 segment drivers, four digit drivers, and the scanning circuitry necessary to multiplex the four monolithic LED characters. In normal
operation, the divide-by-four counter sequentially accesses each of the four RAM locations and simultaneously enables the appropriate display digit driver. The output of the RAM is decoded by the character generator which, in turn, enables the appropriate display segment drivers. Sevenbit ASCII data is stored in RAM. Since the display uses a 64character decoder, half of the possible 128 input combinations are invalid. For each display location where D5 = D6 in the
ASCII RAM, the display character is blanked. Data Entry HPDL-1414 Figure 2 shows a truth table for the HPDL-1414. Data is loaded into the display through the DATA inputs (D6-D0), ADDRESS inputs (A1-A0), and WRITE (WR). After a character has been written to memory, the IC decodes the ASCII data, drives the display and refreshes it without any external hardware or software.
Figure 1. HPDL-1414 Internal Block Diagram.
Figure 2. HPDL-1414 Write Truth Table.
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Optical Considerations/ Contrast Enhancement
The HPDL-1414 display uses a precision aspheric immersion lens to provide excellent readability and low off-axis distortion. The aspheric lens produces a magnified character height of 2.85 mm (0.112 in.) and a viewing angle of 40. These features provide excellent readability at distances up to 1.5 metres (4 feet). Each display is tested for luminous intensity and marked with an intensity category on the side of the display package. To ensure intensity matching for multiple package applications, mixing intensity categories for a given panel is not recommended. The display is designed to provide maximum contrast when placed behind an appropriate contrast enhancement filter. For further information on contrast enhancement, see Application Note 1015.
The HPDL-1414 is assembled by die attaching and wire bonding the four GaAsP/GaAs monolithic LED chips and the CMOS IC to a printed circuit board. An immersion lens is formed by placing the PC board assembly into a nylon lens filled with epoxy. Backfill epoxy environmentally seals the display package. This package construction provides the display with a high tolerance to temperature cycling. 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 HPDL-1414 should be stored in anti-static 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 is caused when the CMOS inputs are subjected either to a voltage below ground (VIN < ground) or to a voltage 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 applied to the display. Transient input voltages should be eliminated.
Soldering and Post Solder Cleaning Instructions
The HPDL-1414 may be hand soldered or wave soldered with SN63 solder. Hand soldering may be safely performed only with an electronically temperaturecontrolled and securely grounded soldering iron. For best results, the iron tip temperature should be set at 315C (600F). For wave soldering, a rosin-based RMA flux can be used. The solder wave temperature should be 245C 5C (473F 9F), and the dwell in the wave should be set at 11/2 to 3 seconds for optimum soldering. Preheat temperature should not exceed 93C (200F) as measured on the solder side of the PC board. For further information on soldering and post solder cleaning, see Application Note 1027, Soldering LED Components.
Mechanical and Electrical Considerations
The HPDL-1414 is a dual in-line package that can be stacked horizontally and vertically to create arrays of any size. These displays are designed to operate continuously between -40C to +85C with a maximum of 10 segments on per digit.
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www.semiconductor.agilent.com Data subject to change. Copyright (c) 2000 Agilent Technologies, Inc. Obsoletes 5091-0679E, 5964-6381E (4/96) 5980-0382E (4/00)

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