Key facts
- Brand
- Fairchild
- Model
- 74HCT
- Category
- Other Electronics
- Documents
- 7
- Languages
- EN
- Last added
- 2012-08-01
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FAIRCHILD MM74HCT540/MM74HCT541Inverting/Non-Inverting Octal 3-STATE Buffer handbook
The MM74HCT540/541 is a high performance CMOS 3-STATE buffer from Fairchild Semiconductor Corporation.
Read onlineFairchild 74HCT specifications
| 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 |
Source: FAIRCHILD Comparison of MM74HC to 74LS 74S 74ALS Logic handbook
All Fairchild 74HCT documents by type
How to use the product for one specific task, with worked examples.
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
How does the speed of MM54HC/MM74HC compare to other logic families?
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.
From: FAIRCHILD Comparison of MM74HC to 74LS 74S 74ALS Logic handbook
What is the main advantage of the MM54HC/MM74HC family?
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.
From: FAIRCHILD Comparison of MM74HC to 74LS 74S 74ALS Logic handbook
What is the typical propagation delay of the MM74HCT00?
The typical propagation delay is 14ns.
Is the MM74HCT00 compatible with TTL logic?
Yes, it has TTL, LS pin-out and threshold compatibility.
Why is the HCT sub-family needed?
HCT is needed because standard HC inputs require a minimum of 3.15V for a logic high, which is not guaranteed by TTL outputs that only reach 2.4V.
From: Fairchild Semiconductor 54HCT/74HCT TTL Compatible CMOS Logic Application Note
Can HCT replace LS-TTL logic?
Yes, HCT can be used as a direct plug-in replacement for 54LS/74LS logic, often reducing power consumption by a factor of 5.
From: Fairchild Semiconductor 54HCT/74HCT TTL Compatible CMOS Logic Application Note