74HC00 Quadruple 2-Input NAND Gates: 74LS Series vs. 74HC Series

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The 74HC00 provides four independent 2-input NAND gates with standard push-pull outputs. The device is designed for operation with a power supply range of 2.0V to 6.0V.

This article provides you with a basic overview of the 74HC00, including its pin descriptions, features and specifications, etc., to help you quickly understand what 74HC00 is.

● Wide Supply Voltage Range from 2.0V to 6.0V

● Sinks or Sources 4mA at V_CC = 4.5V

● CMOS Low Power Consumption

● Schmitt Trigger Action at All Inputs

● ESD Protection Exceeds JESD 22

◆ 200-V Machine Model (A115-A)

◆ 2000-V Human Body Model (A114-A)

◆ Exceeds 1000-V Charged Device Model (C101C)

● Range of Package Options SO-14 and TSSOP-14

● Totally Lead-Free & Fully RoHS Compliant

● Halogen and Antimony Free. “Green” Device

Logic Diagram

Load Circuit and Voltage Waveforms

When to use CD40 chip? When to use 74LS series chips? When to use 74HC series chips? Under what circumstances can chips with the same logic function convert each other?

The CMOS chip has a wide power supply voltage and low power consumption, while the 74LS series power supply voltage must be 5V and high power consumption. Therefore, when the power supply voltage is not 5V or the circuit power consumption is required to be low, such as battery power supply, it is required to save Electricity and the voltage is not 5V, it is suitable to use CMOS chip, but its driving ability is relatively small. When a larger drive capability is required, the 74LS chip is appropriate. For example, when power saving is required at the same time, the 74HC chip is appropriate. Now 74HC is almost substituted for the 74LS chip, because it has the advantages of both CMOS and 74LS. As long as the 74HC and 74LS chips are of the same model, the two can be directly replaced.

The difference between 74LS series and 74HC series of electronic circuits is:

1. LS is a low-power Schottky, HC is a high-speed COMS. The speed of LS is slightly faster than that of HC. HCT input and        output are compatible with LS, but low power consumption; F is a high-speed Schottky circuit;

2. LS is TTL level, HC is CMOS level.

3. The LS input is open for high level, and the HC input is not allowed to be open. HC generally requires a pull-up and              pull- down resistor to determine the level when the input is invalid. LS does not have this requirement

4. The pull-down of LS output is strong and the pull-up is weak. The pull-up and pull-down of HC are the same.

5. The working voltage is different, LS can only use 5V, while HC is generally 2V to 6V;

6. The level is different. LS is TTL level, its low level and high level are 0.8V and 2.4V respectively, while CMOS is 0.3V and          3.6V when the working voltage is 5V, so CMOS can drive TTL, but the reverse is not possible

7. The driving ability is different. The driving ability of LS is generally 5mA for high level and 20mA for low level; while the        high and low level of CMOS are both 5mA;

8. CMOS devices have poor antistatic ability and are prone to latching problems, so the input pins of CMOS cannot be            directly connected to power.

● General Purpose Logic

● Wide array of products such as:

   ◆ PCs, Networking, Notebooks, Netbooks

   ◆ Computer Peripherals, Hard Drives, CD/DVD ROM

   ◆ TV, DVD, DVR, Set Top Box

Marking Information

Suggested Pad Layout

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