Texas Instruments TMC0583


With the TMC05xx building blocks Texas Instruments created a novel architecture for scalable scientific calculators. The architecture uses minimum a 2 chip design with the Arithmetic chip TMC0501E and the SCOM (scanning read only memory) but was expandable to a maximum of 8 SCOM's, additional RAM as program memory for programmable calculators, additional RAM for general purpose registers and even a chip driving a printer. 

The TMC0583 Double Scanning Read Only Memory DSCOM contains 2.5k*13 instruction memory and 16*16 digits constants. The scanning function is not used in the known calculators.


SR-60A, TI-58, TI-59

Technical Specification

Item Min Typ Max Unit Comments
VSS   0   V  
VDD -10.5 -10.0 -9.5 V  
VGG -16.3 -15.8 -15.3 V  
PHI1, PHI2   225 230 kHz Opposite phases


The TMC0583 uses a shrinked SDIP-28 package.

Pin Description

Pin IO Function Pin IO Function
1 O   28 O  
2 V Negative Voltage VGG 27 O  
3 V Negative Voltage VDD 26 O  
4 IO SCOM Interface D0 25 O  
5 IO SCOM Interface D1 24 O  
6 IO SCOM Interface D2 23 O  
7 IO SCOM Interface D3 22 O  
8 O Instruction words 21 O  
9 I Calculating status 20 O  
10 I External access 19 O  
11 I Clock Input 2 18 O  
12 I Clock Input 1 17 O  
13 V Common Voltage 16 O  
14 O   15 O  


If you have additions to the above datasheet please email:

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