Texas Instruments TI-5315

Date of introduction:  1988 Display technology:  Fluorescent
New price:   Display size:  12
Size:  9.7" x 9.2" x 4,8" Printer technology:   
Weight:  1 pound 11 ounces Serial No:  105327
Batteries:   Date of manufacture:  mth 07 year 1989
AC-Adapter:  120 V Origin of manufacture:  Taiwan (Z)
Precision:  12 Integrated circuits:  NEC uPD75206CW-130
Memories:  1 + 1    
Program steps:   Courtesy of:  Joerg Woerner
Download leaflet:   (US: 1.2 MByte)    

TI-5315_Disp.jpg (117917 Byte)Texas Instruments introduced with the TI-5315 in 1988 the unique combination of a printer-less 12-digit commercial desktop calculator with a built-in clock. Compared with the TI-3510 introduced almost 15 years earlier, added the TI-5315 much more functionality into a slightly larger package.

TI-5315_PCB.jpg (526765 Byte)Dismantling the TI-5315 reveals a clean design centered around a NEC uPD75206 4-bit single-chip microcomputer.

Originally developed for VCR controller and similiar applications, matches the architecture of the uPD75206 perfect the requirements of the TI-5315:

bullet6k Byte program memory bullet369 x 4 bit data memory bulletIntegrated watch circuit with 5 uA standby current bulletIntegrated drivers for VF-Displays  bullet0.95 us instruction cycle time @ 4.19 MHz crystal frequency

The printed circuit board (PCB) of the TI-5315 doesn't mention its manufacturer, but the label on the backside of the calculator gives two hints:

bullet The Date code with the leading "Z" identifies Zeny Corporation in
Taiwan, ROC as the contract manufacturer of the TI-5315.
bulletThe UL-File number E42662 of the calculator reveals it as a product
manufactured by Toshiba TEC Corp.

Don't miss the database of all known UL-File numbers found on Texas Instruments calculators.

Texas Instruments continued the design language of the TI-5315 and introduced in 1989 the sibblings TI-5322 and TI-5332 sporting a printer but missing the clock.

The TI-5315 is featured in the Texas Instruments Incorporated bulletin CL-982 dated 1988.


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If you have additions to the above article please email:

Joerg Woerner, July 7, 2009. No reprints without written permission.