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Texas Instruments TMS0700 Family aka TMS0100 2nd Gen.

Features

With the TMS1802NC Texas Instruments announced on September 17, 1971 the first available standard calculator building block on a chip, it was later renamed into TMS0102. The chip integrates 3520-bit Read-Only program memory, a 182-bit Serial-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 5,000 transistors. 

Gordon Moore, the co-founder of Fairchild Semiconductor and Intel predicted already in 1965 that the numbers of transistors in Large-scale Integration (LSI) chips would double every year for the next 10 years. In 1975, looking forward to the next decade, he revised the forecast to doubling every two years, a compound annual growth rate (CAGR) of 41%. While Moore did not use empirical evidence in forecasting that the historical trend would continue, his prediction held since 1975 and has since become known as a "law". Main enablers were and are a combination of both reducing the size of the individual components (process shrink) and increasing the chip size (yield improvement). The manufacturing costs of an Integrated Circuit (IC) are calculated with:

IC cost = (Die cost + Testing cost + Packaging cost) / Final test yield

With the die cost roughly proportional to the die area, testing and packaging costs roughly proportional to the pin count, and the final test yield mostly inverse proportional to the die area, goals are well defined: Keep the die size as small as possible for a set of requirements agreed on. With both ROM (Read-Only Memory) and RWM (Read-Write Memory) sizes the main contributors to the die area of a single-chip calculator circuit and shift-register based data memory (SAM, Serial-Access Memory) of Register Processors denser than RAM (Random-Access Memory) of Digit Processors, Texas Instruments expanded the TMS0100 family two years after its introduction into three different branches:

TMS0600: Increased ROM (384 Words x 11 Bits), Identical SAM (13 Digits Registers), external display drivers. Process shrink, higher functionality
TMS0700: Identical ROM (320 Words x 11 Bits), Identical SAM (13 Digits Registers), external display drivers. Process shrink, identical functionality, cost reduction of IC
TMS0800: Identical ROM (320 Words x 11 Bits), Reduced SAM (11 Digits Registers), integrated segment drivers. Process shrink, reduced functionality, higher integration

Please notice that the members of the TMS0700 family were still marketed and marked as TMS0100 but both the die and the bottom of the chip package usually sport a TMS0700 marking.

Due to a flexible design concept of the TMS0700 architecture 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. The polarity of the segment output can be programmed. Some displays such as LCD (Liquid-Crystal-Display) are easier to interface with inverted polarity. The blanking of the segments is also programmable within limits to facilitate the interface with certain displays such as Panaplex™. Even the style of the numbers 6, 7 and 9 varied among the family members.

Based on the experience of the TMS0120 developed for the SR-10 some fully floating-point devices derived from the TMS0106 were developed:

Features/
Device
[+=]
[−=]
[+] [−]
[=]
[×] [÷] [+/−] [C] [CE] [CONST] [0-9/F] [EE] [1/x] [x2] [sqr X] [%] [‰] [A/D] [00] [pi] Memory Display
Format
TMS0720   * * * *     * * * *         E88888888-88
TMS0723 *   * * * *       * *         -8888888888
TMS0726 *   * * * *       * *         -88888888
TMS0727 *   * * * * *         * *     -8888888888
TMS0728 *   * * * * *         * *     -88888888
TMS0730   * * * *           *     *   -88888888
TMS0731   * * * *                   * -88888888
TMS0732 *   * * * *                 * -88888888
TMS0737   * * * *             *       -88888888
TMS0738   * * * *             *       -8888888888

Family Members and Applications

Type Calculators Keyboard Constant
(M/D)
Digits Fixed DP Rounding Special
Functions
Seg./Dig.
Blanking
(6,7,9)
Font
Seg. H Entry
Overflow
Calculating
Overflow
Pref.
Type
TMS0101 Canon Palmtronic LE-80, LE-83 [+][-][=] 1/2 8 0-7, F DOWN   NONE
S1, S13
      YES
TMS0102 Columbia II [+=][-=] 1/2 8 0-7, F 5/4   NONE
S1, S13
       
TMS0103 Bowmar 901B, JCE Mark II, Montgomery Ward P800, P8F [+=][-=] 1/2 8 0-7, F 5/4   NONE
S1, S13
      YES
TMS0105 Canon L800, Panasonic JE-801A, Privileg 2000 [+=][-=] 1/2 8 0-7, F 5/4   NONE
S1, S13
       
TMS0106 TI-3500, Canon L100S, Radio Shack EC-2000 [+=][-=] 1/2 10 0-9, F 3-POS   S1, S13
S1, S13
    YES
TMS0107 Bowmar 901D [+=][-=] 1/2 10 0-9, F 3-POS   S1, S13
S1, S13
     
TMS0109 TI-3000, Montgomery Ward P800, D8F, Radio Shack EC-1000 [+=][-=] 1/2 8 0-7, F 5/4   S1, S13
S1, S13
     
TMS0112 Toshiba BC-0801B, BC-802B [+=][-] 1/2 8 0-7, F 3-POS   NONE
S1, S13
       
TMS0115 Olympia CD80, Panasonic JE-850 [+][-][=] 1/2 8 Float NONE   S1, S13
S1, S13
     
TMS0117   BCD Coprocessor   10     BCD Output            
TMS0118   [+][-][=] 2/2 10 0-9, F 3-POS   S1, S13
S1, S13
    YES
TMS0119 TI-2500, Heathkit IC-2108 [+][-][=] 2/2 8 0-7, F DOWN   NONE
S1, S13
       
TMS0120 SR-10, Montgomery Ward P300, Radio Shack EC-425 [+][-][=]   8+2 Float NONE [EE][1/x]
[x2][sqr X]
NONE
NONE
     
TMS0121 Olympia CD101, Panasonic JE-1001 [+][-][=]   10 0-9, F 3-POS [R]        
TMS0122 Olympia CD80, Panasonic JE-850 [+][-][=] 1/2 8 Float NONE   S1, S13
S1, S13
     
TMS0123 Hunor 103 [+=][-=] 1/2 10 Float NONE [x2][sqr X] S1, S13
S1, S13
    YES
TMS0125 Canon Palmtronic LE-100 [+][-][=]   10 0-9, F DOWN   S1, S13
S1, S13
       
TMS0126 Canon LE-80R, Casio ROOT-8S, Commodore 3101, Kings Point EC-8413, Privileg 820 [+=][-=] 1/2 8 Float NONE [x2][sqr X] NONE
S1, S13
    YES
TMS0127 Bowmar MX-80, Canon L1000 [+=][-=] 1/2 10 0-9, F 5/4 [A/D][%],
[‰][00]
S1, S13
S1, S13
    YES
TMS0128 Canon LE-82, JCE Percent, Montgomery Ward P8P, Western Auto M4995 [+=][-=] 1/2 8 0-7, F 5/4 [A/D][%],
[‰][00]
S1, S13
S1, S13
    YES
TMS0130 Olympia CD85, Panasonic JE-860 [+][-][=]   8     [sqr X][pi]        
TMS0131 Olympia CD81, Panasonic JE-835, JE-855 [+][-][=]   8     Memory        
TMS0132 APF Mark VII, Craig 4510,
Hunor 88
[+=][-=]   8     Memory            
TMS0135 Exactra 20, TI-2000 [+][-][=]   6 0-5, F                
TMS0137 Sears 8 [+][-][=]   8     [%]            
TMS0138 Canon Pocketronic II [+][-][=]   10     [%]            
TMS0719 TI-2500 [+][-][=] 2/2 8 0-7, F DOWN   NONE
S1, S13
       

 

Technical Specifications

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

Technology

The TMS0700 was manufactured in a 8 um metal gate PMOS process (metal width = 0.30 mil / 8.0 um, metal spacing = 0.35 mil / 9.0 um, diffusion width = 0.25 mil / 6.0 um, diffusion spacing = 0.35 mil / 9.0 um).

The die size of the TMS0700 is approximately 200 mils * 210 mils / 5.0 mm * 5.3 mm.

Packaging

The TMS0700 uses a standard 0.6” wide 28-pin DIP (Dual In-line Package with a 0.1” / 2.54 mm lead pitch).

Pin Configuration

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/G (EXP)
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-G/H and DP (Decimal Point) are connected to the display in the pictured way.
The Segment drivers A-G/H and DP (Decimal Point) are connected to the display in the pictured way. The TMS0720 repurposes the Segment H for the minus sign of the Exponent in the pictured way.

Keyboard Scan-Matrix

The keyboards of all calculators based on the TMS0700 family consist of a x/y-matrix connected to the digit driver outputs D1-D11 and the keymatrix inputs KN (Numbers) and KO (Operations). In the fixed-point output format mode the position of the decimal point is selected with the KP (Decimal Point) input. The Constant/Chain switch is connected between D10-KQ (Constant).

Scanning is performed in D11 → D1 direction at a rate of about 584 Hz:

State Time = 3 Clocks = 0.012 ms @ CK=250 kHz
Digit Time = 13 States (1 Instruction Cycle) = 0.156 ms @ CK=250 kHz
Scan Time = 11 Digit Times (D1 to D11) = 1.712 ms @ CK=250 kHz
 

TMS0702, 0703, 0705, 0709

 

TMS0701

  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    

 

TMS0706

 

TMS0707

  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 5/4 D7 7 +/− DP7 UP
D8 8   DP8   D8 8   DP8  
D9 9 . DP9 DWN D9 9 . DP9 DWN
D10 0 CE DP0 K D10 0 CE DP0 K
D11   C     D11   C    

 

TMS0718

 

TMS0720

  KN KO KP KQ   KN KO KP KQ
D1 1 + DP1   D1 9    
D2 2 × DP2   D2 8 +    
D3 3 ÷ DP3   D3 7 ×    
D4 4 DP4   D4 6 ÷ sqrX  
D5 5   DP5   D5 5 CD    
D6 6   DP6   D6 4 EE 1/x  
D7 7 +/− DP7 5/4 D7 3 +/−    
D8 8 = DP8   D8 2 = x2  
D9 9 . DP9 DWN D9 1 .    
D10 0 CE DP0 K D10 0      
D11   C     D11   C    

 

TMS0723, 0726

 

TMS0727 (*), 0728

  KN KO KP KQ   KN KO KP KQ
D1 1 x2     D1 1 DP1  
D2 2 ×     D2 2 × DP2  
D3 3 ÷     D3 3 ÷ DP3  
D4 4 sqrX     D4 4 % DP4  
D5 5 +=     D5 5 += DP5  
D6 6 −=     D6 6 -= DP6  
D7 7 +/−     D7 7 00 DP7  
D8 8       D8 8 A/D DP8(*)  
D9 9 .     D9 9 . DP9(*)  
D10 0 CE   K D10 0 CE DP0 K
D11   C     D11   C    

Display

Calculators based on the TMS0700 use all kinds of displays including but not limited to LED (Light-Emitting-Diode), Panaplex™ (Gas-Discharge-Display), and VFD (Vacuum-Fluorescent-Display) technology.

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

© Joerg Woerner, July 12, 2021. No reprints without written permission.