Overview
The CD74HC7266MT, produced by Texas Instruments, is a quadruple 2-input XNOR gate integrated circuit. This device contains four independent Exclusive NOR gates, each performing the Boolean function Y = A ⊕ B in positive logic. It is part of the HC (High-Speed CMOS) logic family, known for its wide operating voltage range and significant power reduction compared to LSTTL logic ICs.
The CD74HC7266MT is available in a 14-pin SOIC package and operates over a wide temperature range of -55°C to 125°C, making it suitable for various industrial and commercial applications.
Key Specifications
| Parameter | Unit | Min | Max | |
|---|---|---|---|---|
| VCC Supply Voltage | V | -0.5 | - | 7 |
| Input Clamp Current (IIK) | mA | -20 | - | 20 |
| Output Clamp Current (IOK) | mA | -20 | - | 20 |
| Continuous Output Current (IO) | mA | -25 | - | 25 |
| Operating Free-Air Temperature (TA) | °C | -55 | - | 125 |
| Junction Temperature (TJ) | °C | - | - | 150 |
| Propagation Delay (tpd) at VCC = 6V, CL = 50pF | ns | 30 | 25 | 30 |
| Transition Time (tt) at VCC = 6V, CL = 50pF | ns | 13 | 16 | 19 |
Key Features
- Buffered Inputs and Outputs: Ensures stable and reliable signal transmission.
- Wide Operating Voltage Range: Operates from 2 V to 6 V, making it versatile for various applications.
- Wide Operating Temperature Range: Functions from -55°C to 125°C, suitable for harsh environments.
- High Fanout Capability: Supports up to 10 LSTTL loads, enhancing its utility in complex circuits.
- Significant Power Reduction: Compared to LSTTL logic ICs, it offers lower power consumption.
- Balanced CMOS Push-Pull Outputs: Allows the device to sink and source similar currents, ensuring balanced output performance.
- Standard CMOS Inputs: High impedance inputs that are typically modeled as a resistor in parallel with input capacitance.
- Clamp Diode Structure: Inputs and outputs have both positive and negative clamping diodes to protect against voltage spikes.
Applications
- Detect Phase Differences in Input Signals: Useful in timing and synchronization circuits.
- Selectable Inverter / Buffer: Can be used to create versatile logic circuits.
- Logical Comparators: Ideal for comparing two input signals.
- Parity Generators and Checkers: Used in error detection and correction circuits.
- Adders/Subtractors: Can be part of arithmetic logic units (ALUs).
- Bus Drivers: Capable of driving up to 15 LSTTL loads, making it suitable for bus applications.
Q & A
- What is the CD74HC7266MT used for?
The CD74HC7266MT is used as a quadruple 2-input XNOR gate, providing four independent Exclusive NOR logic functions.
- What is the operating voltage range of the CD74HC7266MT?
The device operates from 2 V to 6 V.
- What is the temperature range for the CD74HC7266MT?
The device functions from -55°C to 125°C.
- How many LSTTL loads can the CD74HC7266MT drive?
The device can drive up to 10 LSTTL loads.
- What are the key features of the CD74HC7266MT's outputs?
The outputs are balanced CMOS push-pull, allowing the device to sink and source similar currents.
- What type of inputs does the CD74HC7266MT have?
The device has standard CMOS inputs, which are high impedance.
- How do the clamping diodes protect the CD74HC7266MT?
The inputs and outputs have both positive and negative clamping diodes to protect against voltage spikes.
- What are some common applications of the CD74HC7266MT?
Common applications include detecting phase differences, creating selectable inverters/buffers, logical comparators, parity generators/checkers, and adders/subtractors.
- How should the outputs of the CD74HC7266MT be handled?
Outputs should not be connected directly to VCC or ground. Unused outputs can be left floating.
- What precautions should be taken when handling the CD74HC7266MT?
Ensure that the electrical and thermal limits defined in the datasheet are followed to avoid damage. Use decoupling capacitors and ensure proper load conditions.
