Overview
The SN74HC20DR is a dual 4-input NAND gate integrated circuit produced by Texas Instruments. This device contains two independent NAND gates, each performing the Boolean function Y = A ● B ● C ● D in positive logic. It is part of the HC (High-Speed CMOS) logic family, known for its wide operating voltage range and low power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | -40°C to +85°C | °C |
| Supply Voltage | 2 V to 6 V | V |
| High-Level Input Voltage | 1.5 V (VCC = 2 V), 3.15 V (VCC = 4.5 V), 4.2 V (VCC = 6 V) | V |
| Low-Level Input Voltage | 0.5 V (VCC = 2 V), 1.35 V (VCC = 4.5 V), 1.8 V (VCC = 6 V) | V |
| Propagation Delay | 45 ns (VCC = 2 V), 22 ns (VCC = 4.5 V), 19 ns (VCC = 6 V) | ns |
| Transition Time | 27 ns (VCC = 2 V), 15 ns (VCC = 4.5 V), 13 ns (VCC = 6 V) | ns |
| Junction-to-Ambient Thermal Resistance | 133.6 °C/W | °C/W |
Key Features
- Buffered Inputs: Ensures stable input signals.
- Wide Operating Voltage Range: Operates from 2 V to 6 V.
- Wide Operating Temperature Range: Functional from -40°C to +85°C.
- High Fanout Capability: Supports up to 10 LSTTL loads.
- Low Power Consumption: Significant power reduction compared to LSTTL logic ICs.
- Balanced CMOS Push-Pull Outputs: Allows the device to sink and source similar currents.
Applications
- Alarm / Tamper Detect Circuits: Can be used in security systems to detect unauthorized access.
- S-R Latch: Useful in creating basic memory elements.
- General Logic Circuits: Suitable for various digital logic applications requiring NAND gate functionality.
Q & A
- What is the SN74HC20DR?
The SN74HC20DR is a dual 4-input NAND gate integrated circuit produced by Texas Instruments.
- What is the operating voltage range of the SN74HC20DR?
The device operates from 2 V to 6 V.
- What is the operating temperature range of the SN74HC20DR?
The device is functional from -40°C to +85°C.
- How many NAND gates are included in the SN74HC20DR?
The device contains two independent 4-input NAND gates.
- What is the propagation delay of the SN74HC20DR?
The propagation delay is 45 ns (VCC = 2 V), 22 ns (VCC = 4.5 V), and 19 ns (VCC = 6 V).
- What is the thermal resistance of the SN74HC20DR in the SOIC package?
The junction-to-ambient thermal resistance is 133.6 °C/W.
- Can the SN74HC20DR be used in high-fanout applications?
Yes, it supports up to 10 LSTTL loads.
- What are some common applications of the SN74HC20DR?
It is commonly used in alarm/tamper detect circuits, S-R latches, and general logic circuits.
- What is the package type of the SN74HC20DR?
The device is available in a 14-pin SOIC (D) package.
- Does the SN74HC20DR have balanced CMOS push-pull outputs?
Yes, it does, allowing the device to sink and source similar currents.
