Key facts
- Brand
- Fairchild
- Model
- 74HC
- Category
- Other Electronics
- Documents
- 31
- Languages
- EN
- Last added
- 2012-08-01
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Fairchild MM74HC High-Speed CMOS Logic Interfacing Application Note
This document provides guidance on interfacing MM74HC high-speed CMOS logic with other logic families and control circuitry. It covers interfacing at the same supply voltage, such as connecting to 74LS TTL, CD4000 CMOS, and ECL logic, as well as interfacing to circuitry operating on different voltages which may require level translation.
Read onlineFairchild 74HC specifications
| Typical propagation delay | 12ns |
|---|---|
| Low quiescent current | 80µA |
| Output current (Min) | 6mA |
| Fanout of LS-TTL equivalent inputs | 15 |
| Supply Voltage (Recommended) | 4.5V to 5.5V |
| Operating Temperature Range | -40°C to +85°C |
Source: FAIRCHILD MM74HCT540/MM74HCT541Inverting/Non-Inverting Octal 3-STATE Buffer handbook
All Fairchild 74HC documents by type
How to use the product for one specific task, with worked examples.
- Fairchild MM74HC High-Speed CMOS Logic Interfacing Application Note 12 p
- FAIRCHILD Comparison of MM74HC to 74LS 74S 74ALS Logic handbook 8 p
- Fairchild MM74HC High-Speed CMOS AC Characteristics Application Note 8 p
- Fairchild 74HC Logic CMOS SCR Latch-Up Elimination Application Note 10 p
- Fairchild MM54HC/MM74HC Power Dissipation Analysis 6 p
- Fairchild Semiconductor 54HCT/74HCT TTL Compatible CMOS Logic Application Note 6 p
- Fairchild MM74HC High-Speed CMOS Logic Application Note – DC Electrical Characteristics 8 p
Ratings, dimensions and ordering codes, for selection and design work.
- FAIRCHILD MM74HCT540/MM74HCT541Inverting/Non-Inverting Octal 3-STATE Buffer handbook 11 p
- Fairchild MM74HCT240/MM74HCT244 Octal 3-STATE Buffer Datasheet 8 p
- Fairchild MM74HC540/MM74HC541 Octal 3-STATE Buffers Datasheet 7 p
- Fairchild MM74HC244 Octal 3-STATE Buffer Datasheet 8 p
- Fairchild MM74HC240 Inverting Octal 3-STATE Buffer Datasheet 8 p
- Fairchild MM74HC125/MM74HC126 3-STATE Quad Buffers Datasheet 10 p
- Fairchild MM74HCT00 Quad 2-Input NAND Gate Datasheet 9 p
- Fairchild MM74HC000 Quad 2-Input NAND Gate Datasheet 9 p
- Fairchild MM74HCU04 Hex Inverter Datasheet 10 p
- Fairchild Semiconductor MM74HCT05 Hex Inverter (Open Drain) Datasheet 9 p
- Fairchild MM74HCT04 Hex Inverter Datasheet 10 p
- Fairchild MM74HC574 3-STATE Octal D-Type Edge-Triggered Flip-Flop Data Sheet 8 p
- Fairchild Semiconductor MM74HC4049/MM74HC4050 Datasheet 6 p
- Fairchild MM74HC4046 CMOS Phase Lock Loop Datasheet 18 p
- Fairchild MM74HC4046 CMOS Phase-Lock Loop Datasheet 17 p
- FAIRCHILD MM74HC4020 MM74HC4040 14-Stage Binary Counter 12-Stage Binary Counter handbook 9 p
- Fairchild MM74HC174 Hex D-Type Flip-Flops with Clear Datasheet 7 p
- Fairchild MM74HC74A Dual D-Type Flip-Flop with Preset and Clear Datasheet 8 p
- Fairchild MM74HC175 Quad D-Type Flip-Flop With Clear Datasheet 7 p
- Fairchild Semiconductor MM74HC08 Quad 2-Input AND Gate Datasheet 9 p
- FAIRCHILD MM74HC4051 MM74HC4052 MM74HC4053 8-Channel Analog Multiplexer handbook 11 p
- Fairchild MM74HC4051/MM74HC4052/MM74HC4053 Analog Multiplexer Datasheet 11 p
Questions answered in these manuals
What is the operating supply voltage range for MM74HC logic?
The high-speed CMOS family can operate from a 2 to 6V supply.
From: Fairchild MM74HC High-Speed CMOS Logic Interfacing Application Note
What is the maximum number of LSTTL equivalent loads a standard MM74HC output can drive?
A standard MM74HC output has a fanout capability of driving 10 LSTTL equivalent load.
From: Fairchild MM74HC High-Speed CMOS Logic Interfacing Application Note
What is the difference between MM74HCT540 and MM74HCT541?
The MM74HCT540 is an inverting buffer, while the MM74HCT541 is a non-inverting buffer.
From: FAIRCHILD MM74HCT540/MM74HCT541Inverting/Non-Inverting Octal 3-STATE Buffer handbook
Are these devices TTL input compatible?
Yes, both devices are TTL input compatible.
From: FAIRCHILD MM74HCT540/MM74HCT541Inverting/Non-Inverting Octal 3-STATE Buffer handbook
What is the difference between MM74HCT240 and MM74HCT244?
The MM74HCT240 is an inverting buffer, while the MM74HCT244 is a non-inverting buffer.
From: Fairchild MM74HCT240/MM74HCT244 Octal 3-STATE Buffer Datasheet
Are these devices TTL input compatible?
Yes, all three devices are TTL input compatible.
From: Fairchild MM74HCT240/MM74HCT244 Octal 3-STATE Buffer Datasheet