7400 series's

Thread Starter

74F00

Joined Oct 26, 2026
9
I made this chart from my research. It is pretty nice for comparing different 7400 series's.

SeriesRelease EraPropagation DelayStatic Power (Per Gate)Operating VoltageDescription
74Mid 1960s10ns10mW4.5 - 5.5VThe first
74HLate 1960s6ns22mW4.5 - 5.5VApparently was hot but at the time was quite fast. H stands for high-speed.
74LLate 1960s33ns1mW4.5 - 5.5VL stands for low-power. Quite obviously it is. (untill you look at CMOS)
74SEarly 1970s3ns19mW4.5 - 5.5VUses Schottky clamping. Makes it faster.
74LSMid 1970s9ns2mW4.5 - 5.5VPretty good. Was really popular and apparently still is. LS stands for low-power schottky
74FLate 1970s3.4ns4mW4.5 - 5.5VInvented by fairchild semiconductors. F is short for FAST: Fairchild Advanced Schottky TTL. Or just because its fast for other manufactures!
74ALSEarly 1980s4ns1mW4.5 - 5.5VPretty much the best it gets for TTL. ALS stands for Advanced Low-power Schottky.
74ASEarly 1980s1.7ns8mW4.5 - 5.5VThe fastest true bipolar TTL family ever made. AS is for advanced Schottky.
 

Thread Starter

74F00

Joined Oct 26, 2026
9
Thanks Dennis for the advice. I will update my table to just have 5v because all ranges have 5v, and nobody really uses those small ranges:

SeriesRelease EraPropagation DelayStatic Power (Per Gate)Operating VoltageDescription
74Mid 1960s10ns10mW~5VThe first
74HLate 1960s6ns22mW~5VApparently was hot but at the time was quite fast. H stands for high-speed.
74LLate 1960s33ns1mW~5VL stands for low-power. Quite obviously it is. (untill you look at CMOS)
74SEarly 1970s3ns19mW~5VUses Schottky clamping. Makes it faster.
74LSMid 1970s9ns2mW~5VPretty good. Was really popular and apparently still is. LS stands for low-power schottky
74FLate 1970s3.4ns4mW~5VInvented by fairchild semiconductors. F is short for FAST: Fairchild Advanced Schottky TTL. Or just because its fast for other manufactures!
74ALSEarly 1980s4ns1mW~5VPretty much the best it gets for TTL. ALS stands for Advanced Low-power Schottky.
74ASEarly 1980s1.7ns8mW~5VThe fastest true bipolar TTL family ever made. AS is for advanced Schottky.

And now for CMOS:


SeriesRelease EraPropagation DelayStatic Power (Per Gate)Operating VoltageDescription
74CMid 1970s~ 30ns-400ns~0.00001 mW3 - 15VSame origional 4000 series tech in 7400 series pinouts.
74HCEarly 1980s~ 33 – 45 ns~0.00001 mW2 - 6VHigh-Speed CMOS; matched 74LS speeds at near-zero
idle.
74HCTEarly 1980s~ 15ns~0.00001 mW~5VHigh-Speed CMOS with inputs modified to accept lower
TTL thresholds.
74ACMid 1980s~ 1 - 9.5ns~0.00001 mW2 - 6V74AC devices can occasionally generate ground bounce or ringing on fast signal transitions
74ACTMid 1980s4ns~0.00001 mW~5V74AC with TTL compatibility. Has same problems as 74AC

Again let me know if I am getting anything wrong here. The propagation delays here vary on supply voltage so I have larger ranges (surprisingly it gets faster the lower the voltage)!
 

Thread Starter

74F00

Joined Oct 26, 2026
9
74C had some parts that had no CD4xxx equivalents.
Same origional 4000 series tech in 7400 series pinouts.
I see what you mean. What I was saying by "4000 series tech", is the configurations of the types of CMOS transistors inside the 4000 series.
In TTL the different series are not just changing externally, they are also changing entire technologies internally, like changing resistor values (74 and 74L), adding transistors (74 and 74H), even entire different circuits (74 and 74S). This is to the point where if you can see what is inside any chip in a series you can know what series it is without even testing it.
With CMOS things get a little different. There are less things to tweek with. So the main difference is with the different ways to make a CMOS transistors. For example for 74HCT they use Level-Shifted Transistors to make it compatible with TTL.

In short what I meant was that the technology of the CMOS transistors themselves and the way they put them together in the 4000 series was directly put into the 74H00 series. This also means that they would have pretty much the same speks if I put them both in my chart.
 
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