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PMOS or pMOS logic (from p-channel metal–oxide–semiconductor) is a family of digital circuits based on p-channel, enhancement mode metal–oxide–semiconductor field-effect transistors (MOSFETs).
The PPS-8 was built on a metal gate process, compared to the contemporary Intel 8008 and similar designs which were based on the more advanced silicon gate PMOS logic process. PMOS logic required large amounts of power; the PPS-8 ran on a -17 VDC power supply and also needed separate -12V, +5V and ground. [1]
MOSFET logic Researcher(s) Organization Ref; June 1960: 20,000 nm: 100 nm: PMOS: Mohamed M. Atalla, Dawon Kahng: Bell Telephone Laboratories [2] [3] NMOS: 10,000 nm: 100 nm: PMOS Mohamed M. Atalla, Dawon Kahng: Bell Telephone Laboratories [4] NMOS May 1965: 8,000 nm 150 nm: NMOS Chih-Tang Sah, Otto Leistiko, A.S. Grove Fairchild Semiconductor ...
One example is the Philips NORBIT family of logic building blocks. The PMOS and I 2 L logic families were used for relatively short periods, mostly in special purpose custom large-scale integration circuits devices and are generally considered obsolete. For example, early digital clocks or electronic calculators may have used one or more PMOS ...
Alternatively, rather than static logic gates, dynamic logic such as four-phase logic was sometimes used in processes that did not have depletion-mode transistors available. For example, the 1971 Intel 4004 used enhancement-load silicon-gate PMOS logic , and the 1976 Zilog Z80 used depletion-load silicon-gate NMOS.
PMOS (or pMOS) may refer to: PMOS logic; n-channel MOSFET; Prime Minister's Official Spokesman; Primary Military Occupational Specialty; postmarketOS, a free and open ...
Designers predominantly used MOSFET transistors with pMOS logic in the early 1970s, switching to nMOS logic after the mid-1970s. nMOS had the advantage that it could run on a single voltage, typically +5V, which simplified the power supply requirements and allowed it to be easily interfaced with the wide variety of +5V transistor-transistor ...
Four-phase logic is a type of, and design methodology for dynamic logic. It enabled non-specialist engineers to design quite complex ICs , using either PMOS or NMOS processes. It uses a kind of 4-phase clock signal .