DATAMATH CALCULATOR MUSEUM
The TMC0980 family of single-chip calculator circuits was introduced in June 1976 with the two scientific calculators SR-40/TI-30 and the financial calculator Business Analyst of the Majestic product line. The TMC0980 is an extension of the TMS1000 Microcomputer family and allows for highly cost optimized calculators with up to 40 keys and a 9-digit LED Display powered by a 9V battery. Additional cost savings could be achieved by replacing a conventional [ON-OFF] switch with a simple push-button [ON] key. The TMC0980 chip includes 18,432 Bits Read-Only Memory (ROM, 2k*9 Bits) and 576 Bits Random-Access Memory (RAM, 9 Registers * 16 digits), a 4-bit Arithmetic unit, a programmable PLA for segment decoding and both segment and digit drivers for a 9-digit LED Display.
Due to a flexible design concept with both programmable ROM and segment decoder some design variations of the TMC0980 were introduced and Texas Instruments expanded the product family before finally converting the design with the TP0320 from a 9V metal gate PMOS process to a 3V metal gate CMOS process:
• TMC1980: 9-digit, 7-segment VF-Display, 28-pin Package (Dataman)
• TMC0260: 11-digit, 7-segment VF-Display, Thermal Printer Interface, 40-pin Package (TI-5040)
• TMC0270: 9-digit, 14-segment VF-Display, 40-pin Package (Speak & Spell)
The TMC0260 was introduced in June 1978 with the second generation of the TI-5040 Printing Desktop Calculator and replaced the segment and digit drivers for a 9-digit LED Display with high-voltage drivers for an 11-digit VF-Display and integrates an interface for a Thermal Printer. To accommodate these additional features the 28-pin package of the TMC0980 was replaced with a 40-pin package.
|TMC0261||TI-5040 (Version 2)||Desktop Printing||10-digit display,
|TMC0262||TI-5025||Portable Printing||8-digit display,
|TMC0263||TI-5135||Desktop Printing||10-digit display,
|Architecture||Single-chip Calculator||Scientific, Financial|
|Category||Digit Processor||4-bit digits|
|ROM Size||18,432 Bits||2048 Words * 9 Bits|
|RAM Size||576 Bits||9 Registers * 16 digits|
|Outputs||11 Digits, 8 Segments||Integrated Digit and Segment Drivers|
1 Clock Mode
|Segment to Keyboard Scan-Matrix|
The TMC0260 was manufactured in a 6 um metal gate PMOS process (metal width = 0.25 mil / 6.0 um, metal spacing = 0.25 mil / 6.0 um, diffusion width = 0.15 mil / 4.0 um, diffusion spacing = 0.30 mil / 8.0 um).
The die size of the TMC0260 is approximately 215 mils * 195 mils / 5.5 mm * 5.0 mm.
The TMC0260 uses a 0.6” wide 40-pin DIP (Dual In-line Package with a 0.1” / 2.54 mm lead pitch).
|The Segment drivers A-G, DP (Decimal Point) and CP (Comma Punctuation) are connected to the display in the pictured way.|
The keyboards of all calculators based on the TMC0260 family consist of an x/y-matrix connected to up to seven segment outputs with the top row ([ON] key) connected to VSS and the keymatrix inputs K1, K2, K3, K4, and K8.
Calculators based on the TMC0260 make use of a 9-digit or 11-digit VF-Display and a Thermal Printer with 10 or 12 columns and a 5*7 dots matrix font.
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© Sean Riddle and Joerg Woerner, April 6, 2021. No reprints
without written permission.