Overview
The CD74HC02MG4, produced by Texas Instruments, is a high-speed CMOS logic quad two-input NOR gate. This device is part of the 74HC series, known for its wide operating voltage range and low power consumption. It contains four independent 2-input NOR gates, each performing the Boolean function Y = A + B in positive logic. The CD74HC02MG4 is available in a 14-pin SOIC package and is suitable for a variety of digital logic applications due to its balanced CMOS push-pull outputs and wide operating temperature range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 2 to 6 | V |
| Operating Temperature Range | -55 to 125 | °C |
| Propagation Delay (tpd) at 2 V, CL = 50 pF | 90 to 135 | ns |
| Propagation Delay (tpd) at 4.5 V, CL = 50 pF | 18 to 27 | ns |
| Propagation Delay (tpd) at 6 V, CL = 50 pF | 15 to 23 | ns |
| Input Capacitance (Ci) at 5 V | 10 | pF |
| High Level Output Current | -5.2 | mA |
| Low Level Output Current | 5.2 | mA |
| Junction-to-Ambient Thermal Resistance (RθJA) | 133.6 | °C/W |
Key Features
- Buffered inputs
- Wide operating voltage range: 2 V to 6 V
- Wide operating temperature range: -55°C to +125°C
- Supports fanout up to 10 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
- Balanced CMOS push-pull outputs
- High-speed operation with low power consumption
Applications
- Alarm and tamper detect circuits
- S-R latch circuits
- General digital logic applications requiring NOR gates
- System controllers and data processing systems
- Tamper indicator and security systems
Q & A
- What is the logic function performed by the CD74HC02MG4? The CD74HC02MG4 performs the Boolean function Y = A + B in positive logic for each of its four independent 2-input NOR gates.
- What is the operating voltage range of the CD74HC02MG4? The operating voltage range is from 2 V to 6 V.
- What is the operating temperature range of the CD74HC02MG4? The operating temperature range is from -55°C to +125°C.
- What type of outputs does the CD74HC02MG4 have? The CD74HC02MG4 has balanced CMOS push-pull outputs.
- How many NOR gates are included in the CD74HC02MG4? The device includes four independent 2-input NOR gates.
- What is the typical propagation delay of the CD74HC02MG4 at 5 V with a load capacitance of 50 pF? The typical propagation delay is around 18 to 27 ns.
- Can the CD74HC02MG4 drive a load with high capacitance? While it can drive a load with a total capacitance less than or equal to 50 pF, larger capacitive loads are not recommended.
- What is the junction-to-ambient thermal resistance (RθJA) for the SOIC package? The RθJA is 133.6 °C/W.
- How should unused inputs be handled on the CD74HC02MG4? Unused inputs must be terminated to either VCC or ground, either directly or with a pull-up or pull-down resistor.
- What are some common applications of the CD74HC02MG4? Common applications include alarm and tamper detect circuits, S-R latch circuits, and general digital logic applications.
- Is the CD74HC02MG4 lead-free? Yes, the CD74HC02MG4 is lead-free.
