Overview
The SN74HC02DRG4 is a quadruple 2-input NOR gate integrated circuit produced by Texas Instruments. This device is part of the 74HC series, known for its high-speed CMOS logic and low power consumption. It contains four independent 2-input NOR gates, each performing the Boolean function Y = A + B in positive logic. This IC is widely used in various digital logic applications due to its robust specifications and versatile functionality.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | - | 6 | V |
| Operating Temperature | -40 | - | 85 | °C |
| Input Clamp Current (IIK) | - | - | ±20 | mA |
| Output Clamp Current (IOK) | - | - | ±20 | mA |
| Continuous Output Current | - | - | ±25 | mA |
| High-Level Output Voltage (VOH) at VCC=4.5V, IOH=-4mA | 3.98 | 4.3 | 4.4 | V |
| Low-Level Output Voltage (VOL) at VCC=4.5V, IOL=4mA | 0.17 | 0.26 | 0.33 | V |
| Input Leakage Current (II) | - | - | ±0.1 | µA |
| Supply Current (ICC) at VCC=6V | - | - | 20 | µA |
| Propagation Delay Time (tpd) at VCC=4.5V | 9 | 18 | 27 | ns |
Key Features
- Buffered inputs
- Wide operating voltage range: 2 V to 6 V
- Wide operating temperature range: –40°C to +85°C
- Supports fanout up to 10 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
- Low power consumption: Maximum ICC of 20 µA
- Typical propagation delay time (tpd) of 8 ns at VCC = 5 V
- ±4-mA output drive at 5 V
- Low input current of 1-µA maximum
- CMOS inputs and balanced CMOS push-pull outputs
Applications
- Alarm and tamper detect circuits
- S-R latch and other digital logic circuits
- Education and training equipment
- Toys and musical instruments
- Medical healthcare and fitness devices
- Grid infrastructure and electronic point of sale systems
- Test and measurement equipment
- Factory automation and control systems
- Building automation systems
Q & A
- What is the SN74HC02DRG4 used for?
The SN74HC02DRG4 is used as a quadruple 2-input NOR gate in digital logic circuits, performing the Boolean function Y = A + B in positive logic.
- What is the operating voltage range of the SN74HC02DRG4?
The operating voltage range is from 2 V to 6 V.
- What is the operating temperature range of the SN74HC02DRG4?
The operating temperature range is from –40°C to +85°C.
- How many LSTTL loads can the SN74HC02DRG4 support?
The device can support fanout up to 10 LSTTL loads.
- What is the typical propagation delay time of the SN74HC02DRG4?
The typical propagation delay time (tpd) is 8 ns at VCC = 5 V.
- What is the maximum supply current (ICC) of the SN74HC02DRG4?
The maximum supply current (ICC) is 20 µA at VCC = 6 V.
- How should unused inputs be handled on the SN74HC02DRG4?
Unused inputs must be terminated to either VCC or ground, using pull-up or pull-down resistors if necessary.
- What type of outputs does the SN74HC02DRG4 have?
The device has balanced CMOS push-pull outputs.
- Can the SN74HC02DRG4 drive capacitive loads?
Yes, it can drive a load with a total capacitance less than or equal to 50 pF while meeting all datasheet specifications.
- What are some common applications of the SN74HC02DRG4?
Common applications include alarm and tamper detect circuits, S-R latches, education and training equipment, and various industrial and medical devices.
- How should the power supply be configured for the SN74HC02DRG4?
The power supply should include a good bypass capacitor, such as a 0.1-μF capacitor, to prevent power disturbances.
