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74HC21D

Name: 74HC21D
Rating: 4.7 (12 reviews)

IC GATE AND 2CH 4-INP 14SOIC

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製造商。部分 #74HC21D
包 SOP14
資料表 74HC21D DataSheet
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規格

Package	Tape & Reel (TR),Cut Tape (CT)
Series	74HC
ProductStatus	Active
LogicType	AND Gate
NumberofCircuits	2
NumberofInputs	4
Voltage-Supply	2V ~ 6V
Current-Quiescent(Max)	1 µA
Current-OutputHighLow	5.2mA, 5.2mA
LogicLevel-Low	0.5V ~ 1.8V
LogicLevel-High	1.5V ~ 4.2V
MaxPropagationDelay@VMaxCL	17ns @ 6V, 50pF
OperatingTemperature	-40°C ~ 85°C
MountingType	Surface Mount
SupplierDevicePackage	14-SOIC

概述

Description

The 74HC21D is a high-speed CMOS dual 4-input NAND gate integrated circuit. It is part of the 74HC family, which is known for its low power consumption and high noise immunity, making it suitable for various digital applications. Each gate in the 74HC21D accepts up to four input signals, allowing for versatile logic functions.
It operates over a wide voltage range (typically 2V to 6V) and features fast switching speeds, which are essential for high-frequency applications. The IC is packaged in multiple formats, including DIP and SOIC, facilitating easy integration into circuits.
Designed for compatibility with standard TTL logic levels, the 74HC21D is commonly used in digital circuits for logic operations, signal processing, and as building blocks in larger systems. Its dual gate configuration allows for efficient space utilization on PCBs. Overall, the 74HC21D is a reliable choice for engineers and hobbyists looking to implement NAND logic in their projects.

Features

The 74HC21D is a quad 2-input NAND gate integrated circuit designed for high-speed and low-power applications. Key features include:
1. Logic Gates: Contains four independent 2-input NAND gates.
2. Supply Voltage: Operates on a wide supply voltage range, typically from 2V to 6V.
3. High-Speed Operation: Provides fast switching times, making it suitable for high-frequency applications.
4. Low Power Consumption: Designed for low power usage, ideal for battery-operated devices.
5. TTL Compatible: Compatible with TTL outputs, ensuring easy integration with other digital logic families.
6. Pin Configuration: Available in various packages (e.g., DIP, SOIC) for versatile mounting options.
7. Temperature Range: Generally operates within a temperature range of -40°C to +85°C.
8. Output Drive Capability: Capable of driving standard TTL loads, enhancing its utility in various circuits.
Overall, the 74HC21D is a reliable choice for implementing NAND logic in digital systems.

Package

The 74HC21D is typically packaged in a 14-pin dual in-line package (DIP). It may also be available in surface mount options like SOIC (Small Outline Integrated Circuit) or TSSOP (Thin Shrink Small Outline Package), depending on the manufacturer.

Pinout

The 74HC21D is a dual 4-input NAND gate IC. It contains two separate NAND gate circuits, each with four inputs.
Pin Count: The 74HC21D has 14 pins.
Pin Functions:
1. Pin 1 (A1) - Input of the first NAND gate (1)
2. Pin 2 (B1) - Input of the first NAND gate (2)
3. Pin 3 (C1) - Input of the first NAND gate (3)
4. Pin 4 (D1) - Input of the first NAND gate (4)
5. Pin 5 (Y1) - Output of the first NAND gate
6. Pin 6 (GND) - Ground
7. Pin 7 (A2) - Input of the second NAND gate (1)
8. Pin 8 (B2) - Input of the second NAND gate (2)
9. Pin 9 (C2) - Input of the second NAND gate (3)
10. Pin 10 (D2) - Input of the second NAND gate (4)
11. Pin 11 (Y2) - Output of the second NAND gate
12. Pin 12 (Vcc) - Supply voltage
13. Pin 13, 14 - Not used (N/C)
This IC is commonly used in digital logic applications.

Manufacturer

The 74HC21D is manufactured by Texas Instruments (TI), a prominent American technology company. Texas Instruments specializes in designing and manufacturing semiconductors and various integrated circuits (ICs). Founded in 1930, the company has a strong focus on analog and embedded processing, providing innovative solutions for a wide range of applications, including automotive, industrial, communications, and consumer electronics. The 74HC21D specifically is a dual 4-input NAND gate, part of the 74HC series, which is known for its high-speed CMOS logic families. Texas Instruments is renowned for its commitment to quality and innovation in the electronics industry, making it a key player in the global semiconductor market.

Application

The 74HC21D is a dual 4-input NAND gate IC used in various digital applications, including logic circuit design, combinational logic functions, and signal processing. It can be employed in data routing, control systems, and arithmetic operations. Its versatility makes it suitable for applications in computers, automotive electronics, consumer devices, and industrial automation, where efficient logic operations are required.

Equivalent

The 74HC21D is a dual 4-input NAND gate. Equivalent products include:
1. 74HCT21 (TTL compatible)
2. 74LS21 (Low-power Schottky)
3. 74HC20 (dual 4-input NOR, if logic type is not critical)
4. MC74HC21A (Motorola equivalent)
Always check specific datasheets for compatibility based on voltage and logic levels.