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Texas Instruments TMS0102 Family

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Features

With the TMS0102 Texas Instruments introduced end of the year 1971 the first available standard calculator building block on a chip. The chip containes 3520-bit read-only program memory, a 182-bit random-access memory and a decimal arithmetic logic unit as well as control, timing, and output decoders but no drivers for the display. This gives an overall complexity of roughly 5000 transistors. 

Due to a flexible design concept with both programmable PLA and ROM techniques a lot of design variations appeared. These include two different types of the key-matrix, 8 or 10 digits of 7- or 8-segmented outputs. Even the style of the numbers 4,6 and 9 varied among the family members.

A typical calculator built around the TMS0102 family performs the four basic functions +,-,*,: with either Constant or Chain operation. The calculations are done on a floating decimal-point operation but the display of the results could be selected between the floating-point or a fixed-point format. The keyboard scanning, debouncing and encoding in performed inside the chip. The display outputs are fully decoded with a leading zero suppresion and multiplexed.

The family was later expanded with the TMS0123 design.

It took about a year till the first copy of the original design appeared. US based company Mostek introduced the MK5020P December, 1972.

The TMS0112 was produced in Japan by Toshiba, too. 

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Family Members and Usage

Type Calculator Key-Matrix Digits Segment decoder Timing
TMS0101 Canon Palmtronic LE-83 [+],[-],[=] 8 LED
TMS0102 Columbia II [+=],[-=] 8 LED
TMS0103 Bowmar 901B, JCE Mark II [+=],[-=] 8 LED
TMS0105 Canon L800 [+=],[-=] 8 LED
TMS0106 TI-3500, Canon L100S [+=],[-=] 10 Panaplex
TMS0107 Bowmar 901D [+=],[-=] 10   LED
TMS0109 TI-3000 [+=],[-=] 8 Panaplex
TMS0110 TI-2500 Preseries  [+],[-],[=] 8   LED
TMS0111 Minimath prototypes  [+],[-],[=] 8   LCD
TMS0112 Toshiba BC-0802 [+=],[-],[=] 8   LED
TMS0115 Panasonic JE-850U [+],[-],[=] 8 LED
TMS0118   [+],[-],[=] 10   LED
TMS0119 TI-2500, Heathkit IC-2108 [+],[-],[=] 8 LED
TMS0719 TI-2500 [+],[-],[=] 8 LED
TMS1875 Heathkit IC-2008 [+],[-],[=] 8 LED

 

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Technical Specification

Item Min Typ Max Unit Comments
VSS   0   V   
VDD -8.1 -7.2 -6.6 V   
VGG -13.2 -14.4 -16.2 V   
IDD   17 25 mA  
IGG   10 15 mA  
CK  100 250 400 kHz  Level between VSS and VGG       
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Housing

The TMS0102 uses a standard DIP-28 package.

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Pin Description

Pin IO Function Pin IO Function
1 I Clock Input 28 V Common Voltage
2 I Keymatrix input P 27 I Keymatrix input Q
3 O Digit driver 1 (LSD) 26 I Keymatrix input N
4 O Digit driver 2 25 I Keymatrix input O
5 O Digit driver 3 24 O Segment driver DP
6 O Digit driver 4 23 O Segment driver H
7 O Digit driver 5 22 O Segment driver G
8 O Digit driver 6 21 O Segment driver F
9 O Digit driver 7 20 O Segment driver E
10 O Digit driver 8 (MSD8) 19 O Segment driver D
11 O Digit driver 9  18 O Segment driver C
12 O Digit driver 10 (MSD10) 17 O Segment driver B
13 O Digit driver 11 (OVER) 16 O Segment driver A
14 V Negative Voltage VDD 15 V Negative Voltage VGG
The Segment drivers A-H and the Decimal point are connected to a display in the pictured way.
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Keyboard Scanmatrix

The keyboards of all calculators based on the TMS0102 family consist of a x/y-matrix connected to the digit driver outputs D1-D11 and the keymatrix inputs KN and KO. In the fixed-point output format mode the position of the decimal point is selcted with the KP input. The Constant/Chain switch is connected between D10-KQ.

 

[+=],[-=] Type

 

[+],[-],[=] Type

  KN KO KP KQ   KN KO KP KQ
D1 1   DP1   D1 1 + DP1  
D2 2 * DP2   D2 2 * DP2  
D3 3 : DP3   D3 3 : DP3  
D4 4   DP4   D4 4 - DP4  
D5 5 += DP5   D5 5   DP5  
D6 6 -= DP6   D6 6   DP6  
D7 7 +/- DP7   D7 7 +/- DP7  
D8 8       D8 8 =    
D9 9 .     D9 9 .    
D10 0 CE DP0  K D10 0 CE DP0  K
D11   C     D11   C    
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Display

Calculators based on the TMS0102 use all kinds of displays. Texas Instruments introduced together with the calculator chip two pre-configured LED-moduled (DIS40, DIS95) based on the TIL360 arrays ,the corresponding segment drivers (SN75491) and digit drivers (SN75492). Most designs make use of these parts.

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

Joerg Woerner, February 02, 2001. No reprints without written permission.