Overview
The SN74HC7002DR is a quadruple 2-input NOR gate integrated circuit produced by Texas Instruments. This device is part of the HC (High-Speed CMOS) logic family and features Schmitt-trigger inputs, which provide noise immunity and hysteresis. Although the SN74HC7002 has been discontinued, the SN74HC7002DR remains available in certain packages. It operates over a wide voltage range of 2 V to 6 V and a temperature range of –40°C to +85°C, making it versatile for various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| Operating Free-Air Temperature (TA) | –40 | 85 | °C | |
| Input Voltage (VI) | 0 | VCC | V | |
| Output Voltage (VO) | 0 | VCC | V | |
| Propagation Delay (tpd) at VCC = 2 V | 60 | 130 | 163 | ns |
| Propagation Delay (tpd) at VCC = 4.5 V | 18 | 26 | 33 | ns |
| Propagation Delay (tpd) at VCC = 6 V | 14 | 22 | 28 | ns |
| Transition Time (tt) at VCC = 2 V | 28 | 75 | 95 | ns |
| Transition Time (tt) at VCC = 4.5 V | 8 | 15 | 19 | ns |
| Transition Time (tt) at VCC = 6 V | 6 | 13 | 16 | ns |
| Input Leakage Current (II) | ±1 | µA | ||
| Supply Current (ICC) | 20 | µA | ||
| Input Capacitance (Ci) | 10 | pF | ||
| Power Dissipation Capacitance per Gate (Cpd) | 20 | pF |
Key Features
- Buffered Inputs: The device features buffered inputs which help in reducing the load on the preceding logic stages.
- Schmitt-Trigger Inputs: Provides noise immunity and hysteresis, allowing the inputs to reject noise and maintain stable logic levels.
- Wide Operating Voltage Range: Operates from 2 V to 6 V, making it compatible with a variety of power supply systems.
- Wide Operating Temperature Range: Functions over a temperature range of –40°C to +85°C, suitable for industrial and automotive applications.
- Low Power Consumption: Significant power reduction compared to LSTTL logic ICs, contributing to energy efficiency.
- High Fanout Capability: Supports fanout up to 10 LSTTL loads, enabling it to drive multiple logic stages.
- Balanced CMOS Push-Pull Outputs: Capable of sinking and sourcing similar currents, ensuring balanced output performance.
Applications
- Alarm and Tamper Detect Circuits: Used in security systems to detect tampering and trigger alarms.
- S-R Latch Circuits: Can be configured to create S-R latches, which are fundamental in digital logic circuits.
- General Logic Applications: Suitable for various digital logic applications requiring NOR gate functionality with noise immunity.
Q & A
- What is the SN74HC7002DR?
The SN74HC7002DR is a quadruple 2-input NOR gate integrated circuit with Schmitt-trigger inputs, produced by Texas Instruments.
- What is the operating voltage range of the SN74HC7002DR?
The device operates over a voltage range of 2 V to 6 V.
- What is the temperature range for the SN74HC7002DR?
The device functions over a temperature range of –40°C to +85°C.
- What are the key benefits of Schmitt-trigger inputs in the SN74HC7002DR?
Schmitt-trigger inputs provide noise immunity and hysteresis, allowing the device to reject noise and maintain stable logic levels.
- What are some common applications of the SN74HC7002DR?
Common applications include alarm and tamper detect circuits, S-R latch circuits, and general logic applications requiring NOR gate functionality.
- How many NOR gates are included in the SN74HC7002DR?
The device contains four independent 2-input NOR gates.
- What is the propagation delay of the SN74HC7002DR at different supply voltages?
The propagation delay varies from 60 ns to 163 ns at 2 V, 18 ns to 33 ns at 4.5 V, and 14 ns to 28 ns at 6 V.
- Can the SN74HC7002DR drive multiple LSTTL loads?
Yes, it supports fanout up to 10 LSTTL loads.
- What is the significance of balanced CMOS push-pull outputs in the SN74HC7002DR?
The balanced outputs allow the device to sink and source similar currents, ensuring balanced performance.
- Is the SN74HC7002DR still in production?
No, the SN74HC7002 has been discontinued, but certain packages like the SN74HC7002DR may still be available.
