Overview
The SN74HC132, produced by Texas Instruments, is a quadruple 2-input NAND gate integrated circuit with Schmitt-trigger inputs. This device is part of the HC (High-Speed CMOS) logic family and is designed to operate over a wide temperature range of -40°C to +85°C. It features four independent NAND gates, each performing the Boolean function Y = A ● B in positive logic. The SN74HC132 is available in various package types, including SOIC, SSOP, PDIP, SO, and TSSOP, making it versatile for different design requirements.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Max | |
|---|---|---|---|---|---|
| Operating Free-Air Temperature (TA) | -40°C to 85°C | °C | -40 | - | 85 |
| Supply Voltage (VCC) | - | V | 2 | - | 6 |
| Input Leakage Current (II) | VI = VCC or 0, VCC = 6 V | nA | ±0.1 | - | ±1000 |
| Supply Current (ICC) | VI = VCC or 0, VCC = 6 V | µA | 2 | - | 40 |
| Propagation Delay (tpd) | A or B to Y, VCC = 4.5 V | ns | 18 | - | 31 |
| Transition Time (tt) | Any, VCC = 4.5 V | ns | 8 | - | 19 |
| Power Dissipation Capacitance per Gate (Cpd) | No load, VCC = 2 V to 6 V | pF | - | - | 20 |
Key Features
- Buffered Inputs: The device features buffered inputs which help in stabilizing the input signals.
- Schmitt-Trigger Inputs: The inputs are designed with Schmitt-trigger architecture, providing hysteresis and making the device tolerant to slow or noisy inputs.
- Wide Operating Temperature Range: Operates over a temperature range of -40°C to +85°C.
- Significant Power Reduction: Compared to LSTTL logic ICs, the SN74HC132 offers significant power reduction.
- High Fanout Capability: Supports fanout up to 10 LSTTL loads.
- Balanced CMOS Push-Pull Outputs: The outputs are capable of sinking and sourcing similar currents, ensuring balanced operation.
Applications
- Alarm / Tamper Detect Circuit: The SN74HC132 can be used to create tamper detect circuits and alarm systems.
- S-R Latch: It can be used to create active-low SR latches, which are essential in various digital circuits.
- General Logic Circuits: The device is suitable for use in general logic circuits where NAND gate functionality is required.
Q & A
- What is the operating temperature range of the SN74HC132?
The SN74HC132 operates over a temperature range of -40°C to +85°C.
- What type of inputs does the SN74HC132 have?
The SN74HC132 features Schmitt-trigger inputs.
- How many NAND gates are included in the SN74HC132?
The device contains four independent 2-input NAND gates.
- What is the typical propagation delay of the SN74HC132 at 4.5 V?
The typical propagation delay is 18 ns to 31 ns.
- Can the SN74HC132 drive large capacitive loads?
While it can drive loads with a total capacitance less than or equal to 50 pF, larger capacitive loads are not recommended.
- What is the significance of Schmitt-trigger inputs in the SN74HC132?
Schmitt-trigger inputs provide hysteresis, making the device tolerant to slow or noisy inputs and helping to reject noise.
- How does the SN74HC132 compare to LSTTL logic ICs in terms of power consumption?
The SN74HC132 offers significant power reduction compared to LSTTL logic ICs.
- What is the fanout capability of the SN74HC132?
The device supports fanout up to 10 LSTTL loads.
- What are some common applications of the SN74HC132?
Common applications include alarm/tamper detect circuits, S-R latches, and general logic circuits.
- How should unused inputs be handled in the SN74HC132?
Unused inputs should be properly terminated, typically tied to GND or VCC, to prevent unwanted behavior.
