This document introduces the features and characteristics of the MM54HC/MM74HC family of high-speed logic components. This family of components offers a unique combination of speed and power characteristics that are not found in bipolar logic families or any other CMOS family. It has operating speeds similar to low power Schottky (54LS/74LS) technology, but is approximately half as fast as the 54ALS/74ALS and 54S/74S logic. Compared to CD4000 and 54C/74C, it provides an order of magnitude improvement in speed by utilizing an advanced 3.5 micron silicon gate-recessed oxide CMOS process. Additionally, the MM54HC/MM74HC family retains all the advantages of older metal gate CMOS and provides the functions and pin outs of the popular 54LS/74LS series logic components, as well as several special functions not previously implemented in CD4000 or 54LS/74LS.
This document provides a technical comparison of the Fairchild MM54HC/MM74HC high-speed CMOS logic family with bipolar logic families, specifically LS-TTL, S-TTL, and ALS-TTL. It highlights that the MM54HC/MM74HC family offers operating speeds similar to low power Schottky (54LS/74LS) technology while retaining the advantages of older metal gate CMOS.
| Operating Speed Comparison | Similar to LS-TTL, half as fast as ALS-TTL |
|---|---|
| Process Technology | 3.5 micron silicon gate-recessed oxide CMOS |
| Supply Current (HC-CMOS) | 0.0025 pW |
| Supply Current (LS-TTL) | 5.0 mW |
| Supply Current (ALS-TTL) | 20mW |
| Supply Current (S-TTL) | 75 mW |
The MM54HC/MM74HC family provides speeds similar to low power Schottky (54LS/74LS) technology, but is approximately half as fast as 54ALS/74ALS and 545/745 logic.
It provides a combination of speed and power characteristics not duplicated by bipolar logic families or other CMOS families, with speeds similar to LS-TTL.
HC-CMOS has extremely low quiescent power dissipation (0.0025 pW for gates), whereas LS-TTL dissipates 5.0 mW and S-TTL dissipates 75 mW.