DATAMATH CALCULATOR MUSEUM

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)

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.

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:

	6k Byte program memory
	369 x 4 bit data memory
	Integrated watch circuit with 5 uA standby current
	Integrated drivers for VF-Displays
	0.95 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:

	The Date code with the leading "Z" identifies Zeny Corporation in Taiwan, ROC as the contract manufacturer of the TI-5315.
	The 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.

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