5

Electrical/Optical Characteristics

Description

Symbol

Test Conditions

Min.

Max.

Unit

Supply

HDSP-078xSeries

78

105

mA

Current

HDSP-079x/-088x/-098xSeries

Characters“5.”or

120

175

“B”displayed

Power

HDSP-078xSeries

390

573

mW

Dissipation

HDSP-079x/-088x/-098xSeries

Characters“5.”or

690

963

“B”displayed

Logic,EnableandBlankingLow-Level

0.8

V

InputVoltage

Logic,EnableHigh-LevelInputVoltage

2.0

V

BlankingHigh-Voltage;DisplayBlanked

2.3

V

LogicandEnableLow-LevelInputCurrent

–1.6

mA

BlankingLow-LevelInputCurrent

–10

µA

Logic,EnableandBlankingHigh-Level

+40

µA

InputCurrent

Weight

1.0

gm

LeakRate

cc/sec

Notes:

4.Theluminousintensityataspecificoperatingambienttemperature,

Device

K

HDSP-078Series

–0.0131/°C

HDSP-079xSeries

HDSP-088xSeries –0.0112/°C

HDSP-098xSeries –0.0104/°C

5.Thedominantwavelength,

gramandrepresentsthesinglewavelengthwhichdefinesthecolorof

thedevice.

6.TheHDSP-088XandHDSP-098Xseriesdevicesarecategorizedasto

dominantwavelengthwiththecategorydesignatedbyanumberonthe

backofthedisplaypackage.

Operational Considerations

Electrical

These  devices  use  a  modified  4 x 7  dot  matrix  of  light 

emitting diodes to display decimal/hexadecimal numeric 

information. The high efficiency red and yellow displays 

use  GaAsP/GaP  LEDs  and  the  high  performance  green 

displays use GaP/GaP LEDs. The LEDs are driven by con-

stant  current  drivers,  BCD  information  is  accepted  by 

the display memory when the enable line is at logic low 

and the data is latched when the enable is at logic high. 

Using the enable pulse width and data setup and hold 

times listed in the Recommended Operating Conditions 

allows data to be clocked into an array of displays at a 

6.7 MHz rate.

The decimal point input is active low true and this data 

is latched into the display memory in the same fashion 

as the BCD data. The decimal point LED is driven by the 

on-board IC.

The blanking control input on the hexadecimal displays 

blanks (turns off) the displayed information without dis-

turbing the contents of display memory. The display is 

blanked at a minimum threshold level of 2.0 volts. When 

blanked, the display standby power is nominally 250 mW 

The ESD susceptibility of the IC devices is Class A of MIL-

STD-883  or  Class  2  of  DOD-STD-1686  and  DOD-HDBK-

263.