Overview
The CD74HC132ME4 is a quadruple 2-input NAND gate integrated circuit produced by Texas Instruments. This device is part of the CD74HC series, known for its high-speed CMOS logic and is designed to operate over a wide range of temperatures and supply voltages.
Each gate within the CD74HC132 performs the Boolean function Y = A ● B in positive logic, utilizing Schmitt-trigger inputs which provide hysteresis and make the device highly tolerant to slow or noisy inputs. This feature is particularly useful in rejecting noise and ensuring stable operation in various environmental conditions.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 6 | V | |
| VI Input Voltage | 0 | VCC | V | |
| VO Output Voltage | 0 | VCC | V | |
| TA Operating Free-Air Temperature | -55 | 125 | °C | |
| ICC Supply Current (VI = VCC or 0, IO = 0) | 40 | µA | ||
| II Input Leakage Current (VI = VCC or 0) | 1 | µA | ||
| Ci Input Capacitance (VI = 5 V) | 10 | pF | ||
| RθJA Junction-to-Ambient Thermal Resistance (SOIC) | 133.6 | °C/W |
Key Features
- Buffered Inputs: The device features buffered inputs which enhance signal integrity and reduce noise.
- Schmitt-Trigger Inputs: Each gate has Schmitt-trigger inputs, providing hysteresis and making the device tolerant to slow or noisy inputs.
- Wide Operating Temperature Range: The device operates over a wide temperature range from -55°C to +125°C.
- Significant Power Reduction: Compared to LSTTL logic ICs, the CD74HC132 offers significant power reduction.
- High Fanout Capability: Supports fanout up to 10 LSTTL loads.
- Balanced CMOS Push-Pull Outputs: Ensures balanced output levels and reduces power consumption.
Applications
- Alarm and Tamper Detect Circuits: The CD74HC132 can be used in alarm systems and tamper detection circuits due to its ability to handle noisy inputs.
- S-R Latch Circuits: It can be used to create active-low SR latch circuits, which are essential in various digital logic applications.
- General Logic Functions: The device can be used individually for their logic functions in a variety of digital circuits.
Q & A
- What is the primary function of the CD74HC132?
The CD74HC132 is a quadruple 2-input NAND gate integrated circuit, performing the Boolean function Y = A ● B in positive logic.
- What is the operating temperature range of the CD74HC132?
The device operates over a wide temperature range from -55°C to +125°C.
- What type of inputs does the CD74HC132 have?
The device features Schmitt-trigger inputs, which provide hysteresis and make it tolerant to slow or noisy inputs.
- What is the supply voltage range for the CD74HC132?
The supply voltage range is from 2 V to 6 V.
- How many LSTTL loads can the CD74HC132 support?
The device supports fanout up to 10 LSTTL loads.
- What is the significance of the Schmitt-trigger input architecture?
The Schmitt-trigger input architecture provides hysteresis, making the device extremely tolerant to slow or noisy inputs and helping to reject noise.
- What are some common applications of the CD74HC132?
Common applications include alarm and tamper detect circuits, S-R latch circuits, and general logic functions in digital circuits.
- How should unused inputs be handled in the CD74HC132?
Unused inputs must be terminated to either VCC or ground, either directly or with a pull-up or pull-down resistor.
- What is the recommended capacitive load for the CD74HC132 outputs?
The capacitive load at the output should be ≤ 50 pF for optimal performance.
- What thermal considerations should be taken into account when using the CD74HC132?
Thermal issues are rarely a concern, but power consumption and thermal increase can be calculated using the steps provided in the application report, CMOS Power Consumption and Cpd Calculation.
