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Quad 2-Input EOR Gate 14DIL

CD74HC86E by Texas Instruments
74HC86
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The 74HC series (High-Speed CMOS) is a family of digital logic integrated circuits (ICs) designed to offer high-speed performance comparable to standard 74LS (Low Power Schottky) TTL logic while consuming significantly less power. These ICs use CMOS technology and operate across a wide voltage range, making them ideal for a variety of digital system applications.


1. Technology and Construction

  • CMOS (Complementary Metal-Oxide-Semiconductor): The 74HC series is built on CMOS technology, which provides very high input impedance, low power consumption, and high noise immunity.

  • TTL Compatible Inputs: Many 74HC devices have input thresholds compatible with TTL levels, making them suitable for mixed-technology environments when paired with 74HCT (TTL-compatible) variants.


2. Electrical Characteristics

  • Supply Voltage (Vcc): 2V to 6V (typically 5V)

  • Propagation Delay: ~7–15 ns (at 5V), depending on the specific function

  • Power Consumption: Extremely low static power dissipation; dynamic power is proportional to switching frequency and capacitive load.

  • Input Current: Typically in nanoampere (nA) range, much lower than TTL.

  • Output Drive: Can typically source/sink 4–6 mA at 5V.


3. Logic Functions

The 74HC family includes a comprehensive range of logic functions, mirroring and expanding upon the original 74xx TTL series:

  • Basic Gates: AND, OR, NAND, NOR, XOR, XNOR, NOT

  • Flip-Flops: D, JK, T, and SR varieties

  • Latches and Registers: Transparent latches, shift registers, and data registers

  • Counters: Binary, decade, and programmable counters

  • Multiplexers/Demultiplexers

  • Encoders/Decoders

  • Buffers/Drivers: Tri-state, open-drain, inverting and non-inverting


4. Key Advantages

  • Speed: Faster than standard 4000-series CMOS logic and comparable to 74LS series TTL.

  • Power Efficiency: Much lower static power consumption than TTL due to CMOS technology.

  • Voltage Flexibility: Can operate over a broader range of supply voltages.

  • Drive Capability: Good for moderate current loads; suitable for driving LEDs or interfacing with microcontrollers and other ICs.

  • Compatibility: 74HCT subfamily is TTL-compatible for seamless integration with existing TTL systems.


5. Package Types

  • DIP (Dual In-line Package)
    These various packaging options make 74HC series ICs suitable for both prototyping and production environments.


6. Applications

  • Microcontroller I/O expansion

  • Digital signal routing and logic control

  • Data storage and transfer circuits

  • Timing and sequencing logic

  • Consumer electronics, industrial controls, automotive systems


Examples of Common 74HC Series Devices

Part Number Description
74HC00 Quad 2-input NAND gate
74HC04 Hex Inverter
74HC08 Quad 2-input AND gate
74HC32 Quad 2-input OR gate
74HC74 Dual D-type Flip-Flop with Set and Reset
74HC595 8-bit Serial-In, Parallel-Out Shift Register
74HC138 3-to-8 Line Decoder
74HC393 Dual 4-bit Binary Counter