Difference between revisions of "74 series"
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| − | The '''74 series''' are a pervasive family of [[transistor-transistor logic|TTL]] [[integrated circuit]]s. Originally created by [[Texas Instruments]], eventually all the other major IC producers eventually offered compatibly-functional and -numbered TTL chip lines of their own (so that, say, a 7400 from Motorola was a pin-compatible replacement for the TI chip). | + | The '''74 series''' are a pervasive family of [[transistor-transistor logic|TTL]] [[integrated circuit]]s. Originally created by [[Texas Instruments]], eventually all the other major IC producers eventually offered compatibly-functional and -numbered TTL chip lines of their own (so that, say, a 7400 from [[Motorola]] was a pin-compatible replacement for the TI chip). |
Originally offered in [[Dual Inline Package|DIP]] and 'flat pak' forms, they are now available in [[surface mount]] form as well. | Originally offered in [[Dual Inline Package|DIP]] and 'flat pak' forms, they are now available in [[surface mount]] form as well. | ||
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==Families== | ==Families== | ||
| − | The original 74 series chips (which have numbers of the form '74xx') were joined over time by many other compatible families. '74H' used more power, but were faster; '74L' use less, and were slower. '74S' (using Schottky circuits) which were faster followed, along with '74LS' (low-power Schottky), not as fast as 74S, but using less power. Later '74AS' ('Advanced Schottky) and '74ALS' were added. | + | The original 74 series chips (which have numbers of the form '74xx') were joined over time by many other compatible families. '74H' used more power, but were faster; '74L' use less, and were slower. '74S' (using [[Schottky]] circuits) which were faster followed, along with '74LS' (low-power Schottky), not as fast as 74S, but using less power. Later '74AS' ('Advanced Schottky) and '74ALS' were added. |
| − | The following table gives typical | + | The following table gives typical propagation delay (in nsec) and power consumption (in mW): |
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| − | [[Category: | + | [[Category: Integrated Circuits]] |
Latest revision as of 03:38, 27 February 2023
The 74 series are a pervasive family of TTL integrated circuits. Originally created by Texas Instruments, eventually all the other major IC producers eventually offered compatibly-functional and -numbered TTL chip lines of their own (so that, say, a 7400 from Motorola was a pin-compatible replacement for the TI chip).
Originally offered in DIP and 'flat pak' forms, they are now available in surface mount form as well.
Families
The original 74 series chips (which have numbers of the form '74xx') were joined over time by many other compatible families. '74H' used more power, but were faster; '74L' use less, and were slower. '74S' (using Schottky circuits) which were faster followed, along with '74LS' (low-power Schottky), not as fast as 74S, but using less power. Later '74AS' ('Advanced Schottky) and '74ALS' were added.
The following table gives typical propagation delay (in nsec) and power consumption (in mW):
| Family | Speed | Power |
|---|---|---|
| Original | 10 | 10 |
| H | 6 | 22 |
| L | 33 | 1 |
| S | 3 | 19 |
| LS | 10 | 2 |
| AS | 2 | 8 |
| ALS | 4 | 1 |
