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Texas Instruments DIS175 Twelve-Digit Calculator LED Display

Features

These Twelve-Digit Calculator Numeric Seven-Segment LED Displays are intended for use under pulsed conditions by enabling the common cathode of each digit sequentially and enabling the desired Segment and Decimal Point anodes in phase with the character enabling pulse. The pulse rate is kept high enough so that light from each character appears to the eye to be constant. The "G" segment of Digit 3 is accessible on a separate terminal to allow its use as the minus sign of the Exponent for scientific calculators based on the TMS0100 family of single-chip calculator circuits.

The DIS175 Twelve-Digit display assembly consists of a printed circuit board (PCB) with 12 individual, partly populated Seven-Segment displays and succeeds the DIS115F Display-PCB introduced with the SR-10 and using 12 individual DISXXX Seven-Segment displays. While the DIS175 maintains the mechanical dimensions of the DIS115F, reduces its decreased spacing between the individual display elements and the missing magnifying lens the readability of the 0.125/3.2 mm characters slightly.

0.125/3.2 mm Characters
Seven-Segment Digits with Right-Hand Decimals
Continuous Uniform Segments
Wide Viewing Angle
Common-Cathode Configuration for Multiplex Applications
0.185/4.7 mm Character Spacing
Integrated Clear Plastic Lens

Family Members and Applications

Type Products Digits Comments
DIS175 Montgomery Ward P300 Version 2, Radio Shack EC-425 Segment G
Digit 3

 

Genealogy

Type Products Relationship Comments
DIS115F SR-10 Version 1, Display 2, SR-10 Version 2, SR-10 Version 3, SR-11 Version 1, Display 2  Predecessor  Uses 12*DISXXX
DIS206A TI-2550 Version 2  Relative  9-Digit Bowmar Optostic

 

Technical Specifications

Item Min Typ Max Unit Comments
Display
Width
  2.65
67.5
  inch
mm
  
Display
Height
  0.87
22.0
  inch
mm
  
Display
Depth
  0.26
6.7
  inch
mm
 Including Printed Circuit Board,
 without Pins
PCB
Thickness
  0.03
0.8
  inch
mm
  
Lens
Width
  2.50
63.5
  inch
mm
  
Lens
Height
  0.36
9.2
  inch
mm
  
Lens
Depth
  0.23
5.9
  inch
mm
 
Character
Height
  0.125
3.18
  inch
mm
 
Character
Width
  0.085
2.15
  inch
mm
 w/o Decimal Point
Character
Slant Angle
  10   degrees   
Character
Spacing
  0.185
4.70
  inch
mm
 

Technology

The individual segment and decimal GaAsP (Gallium Arsenide Phosphide) LED chips are mounted with the substrate cathode at the desired positions on a printed circuit board (PCB) and the anodes bonded to the gold plated traces. A one-piece red acrylic plastic lens is attached to the PCB with four heat stakes providing protection for the chips.

Packaging

The DIS115 uses a 2.65" / 67.5 mm by 0.87 / 22.0 mm rectangular printed circuit board (PCB) with 21 solder tabs with a 0.1 / 2.54 mm pitch arranged on the bottom of the display module.

Pin Configuration

Pin Pol. Function
1 A G Segment Digit 3 (H)
2 A G Segments Digits 1-2, 4-12
3 A C Segments
4 A D Segments
5 C Digit 11 (MSD Mantissa)
6 C Digit 12 (Minus Sign)
7 C Digit 10
8 C Digit 9
9 C Digit 8
10 A A Segments
11 C Digit 3 (Minus Sign Exp.)
12 A B Segments
13 C Digit 6
14 C Digit 7
15 C Digit 5
16 A Decimal Points
17 C Digit 4 (LSD Mantissa)
18 C Digit 2 (MSD Exponent)
19 C Digit 1 (LSD Exponent)
20 C E Segments
21 C F Segments
The Anode of the Segments A-G, Segment G (H) for minus sign of the Exponent and Right-Hand Decimals and the Cathode of the Digits 1-12 are connected to the display in the pictured way. 
horizontal rule

If you have additions to the above datasheet please email: joerg@datamath.org.

Joerg Woerner, December 22, 2021. No reprints without written permission.