Overview
The SN74HC21DRE4, produced by Texas Instruments, is a dual 4-input AND gate integrated circuit. This device contains two independent 4-input AND gates, each performing the Boolean function Y = A ● B ● C ● D in positive logic. It is part of the 74HC series, known for its high-speed CMOS logic and wide operating voltage range. This component is widely used in various digital logic applications due to its robust specifications and reliability.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package Type | SOIC (14 pins) | 14-SOIC |
| Operating Voltage Range | Minimum to Maximum Supply Voltage | 2 V to 6 V |
| Operating Temperature Range | Minimum to Maximum Operating Temperature | -40°C to +85°C |
| Output Drive (IOL/IOH) | Maximum Output Current | 5.2 mA / -5.2 mA |
| Propagation Delay | Maximum at VCC = 6 V, CL = 50 pF | 19 ns |
| Input Capacitance | Typical Value | 10 pF |
| Quiescent Current (ICC) | Maximum at Nominal Voltage | 2 µA |
| Logic Level - Low | Input Voltage Range | 0.5 V to 1.8 V |
| Logic Level - High | Input Voltage Range | 1.5 V to 4.2 V |
| RoHS Compliance | Compliance Status | Yes |
Key Features
- Buffered Inputs: Ensures stable and reliable input signals.
- Wide Operating Voltage Range: Operates from 2 V to 6 V, making it versatile for various applications.
- Wide Operating Temperature Range: Functions from -40°C to +85°C, suitable for a broad range of environmental conditions.
- High Fanout Capability: Supports fanout up to 10 LSTTL loads, enhancing its utility in complex digital circuits.
- Low Power Consumption: Significant power reduction compared to LSTTL logic ICs, contributing to energy efficiency.
- Balanced CMOS Push-Pull Outputs: Capable of sinking and sourcing similar currents, ensuring balanced output performance.
Applications
- Combining Power Good Signals: Used in power management systems to combine multiple power good signals.
- Enable Digital Signals: Utilized in digital circuits to enable or disable signals based on multiple input conditions.
- General Digital Logic: Suitable for a wide range of digital logic applications requiring AND gate functionality.
Q & A
- What is the SN74HC21DRE4?
The SN74HC21DRE4 is a dual 4-input AND gate integrated circuit produced by Texas Instruments.
- What is the operating voltage range of the SN74HC21DRE4?
The operating voltage range is from 2 V to 6 V.
- What is the operating temperature range of the SN74HC21DRE4?
The operating temperature range is from -40°C to +85°C.
- How many AND gates are included in the SN74HC21DRE4?
The device contains two independent 4-input AND gates.
- What is the maximum propagation delay of the SN74HC21DRE4 at 6 V?
The maximum propagation delay at VCC = 6 V and CL = 50 pF is 19 ns.
- Is the SN74HC21DRE4 RoHS compliant?
Yes, the SN74HC21DRE4 is RoHS compliant.
- What is the maximum output current of the SN74HC21DRE4?
The maximum output current (IOL/IOH) is 5.2 mA / -5.2 mA.
- What type of package does the SN74HC21DRE4 come in?
The SN74HC21DRE4 comes in a 14-pin SOIC package.
- What are some common applications of the SN74HC21DRE4?
Common applications include combining power good signals, enabling digital signals, and general digital logic applications.
- Does the SN74HC21DRE4 support high fanout?
Yes, it supports fanout up to 10 LSTTL loads.
