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Old Calculator Web Museum Documentation Archive
Hitachi HD3100 PMOS Calculator IC Datasheets




These are early datasheets for the HD3100-series of PMOS Small and Medium-Scale ICs developed by Hitachi specifically for use in electronic calculator designs. This document outlines the initial chips in the series, other chips followed the release of this document. These devices were used in Hitachi's own series of ELCA (ELCA-24, ELCA-32, ELCA-26) electronic calculators from the latter part of the 1960's and early 1970's, as well as many Friden calculators that were OEM'd from Hitachi (EC-1114, EC-1115, EC-1116). The chips were also used in a number of Casio calculators from the era (AL-2000, 121-A/AS-A, 121-B/AS-B) and calculators sold under the Remington brand name that were OEM'd from Casio (Remington EDC-1201), among others.

The scans are from very old photocopies of what appears to be original pages from an early Hitachi component databook, likely translated from Japanese. The copy quality ranges from pretty good to mildly poor, but most all of the documentation is readable despite the varying quality. The document was scanned at higher than usual resolution to allow zooming in on areas that might be a bit tough to read due to some areas of the copies that weren't particularly clear. Note that there are a few pages which appear to be out of order with regard to page numbering. The original document had a page that was misplaced, providing test parameters for the HD3112 chip in the section on the HD3107. I noted this, and put the page in its proper place in the HD3112 data, resulting in page numbers that are not sequential in two places within the document.

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