Signetics 25120 Fully Encoded, 9046 x N, Random access Write-Only Memory
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The inventions and products featured on these pages were chosen either for their uniqueness in the RF engineering realm, or are simply awesome (or ridiculous) enough to warrant an appearance.

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RF Cafe visitor Tony C., who is an engineer working for one of America's great, longtime manufacturers of green farm equipment, sent me a link to this unique memory IC released by Signetics on April 1, 1973. This being April 1, 2017, it seems to be an appropriate day to post the Signetics 25120 Fully Encoded, 9046 x N, Random access Write-Only Memory datasheet that per Wikipedia, "...was created 'as a lark' by Signetics engineer John G 'Jack' Curtis and was inspired by a fictitious and humorous vacuum tube datasheet from the 1940s. It was seen as 'an icebreaker' and was deliberately included in the Signetics catalog."

According to Wikipedia, founded in 1961 "Signetics [now NXP Semi] was an American electronics pioneer, it was the first electronics manufacturer specifically established to make integrated circuits." They made the ubiquitous 555 timer IC.

Also, don't forget the classic datasheet for the Watkins-Johnson WJ-G1/SMG1 Voltage-Controlled Attenuator datasheet with the Phase vs. V_CTLvs. Frequency vs. Phase of the Moon Chart. While you're wasting time, you might as well see the "slightly tentative data" for WEMAC- The One Zed Two Zed Vacuum Tube that was purportedly the inspiration for the Signetics 25120.

Posted April 1, 2017

Johanson Technology Prototyping Kit - RF Cafe Website

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...