74LS14 Schmitt Trigger Hex Inverter IC
The 74LS14 is a Hex Inverter IC with Schmitt Trigger inputs, belonging to the 74XXYY family of logic ICs. This IC provides six independent inverters, each with a built-in Schmitt trigger, offering enhanced noise immunity and precise logic level conversion, especially in environments with slow or noisy input signals. It operates with TTL (Transistor-Transistor Logic) logic levels, making it compatible with a variety of digital systems.
What is a Schmitt Trigger Circuit?
A Schmitt Trigger is a comparator-based circuit that converts noisy or slow digital signals into clean, stable logic levels (HIGH or LOW). The circuit utilizes a positive feedback system that creates hysteresis between the HIGH and LOW voltage levels, making it less sensitive to small fluctuations or noise. This helps eliminate noise from input signals, ensuring reliable digital output.
In a Schmitt Trigger:
- The input signal can be either analog or digital.
- The output is 1 (HIGH) if the input voltage exceeds a set threshold, and 0 (LOW) if the input is below the threshold.
Schmitt triggers are commonly used for:
- Noise filtering
- Signal conditioning
- Converting slow or noisy input signals into clean, sharp digital transitions.
74LS14 Pinout:
The 74LS14 features six independent Schmitt triggers in a single IC, each with an input and an output. The pinout is as follows:
Pin No. |
Pin Name |
Description |
1 |
1A |
Input pin for the 1st Schmitt trigger |
2 |
1Y |
Output pin of the 1st Schmitt trigger |
3 |
2A |
Input pin of the 2nd Schmitt trigger |
4 |
2Y |
Output pin of the 2nd Schmitt trigger |
5 |
3A |
Input pin of the 3rd Schmitt trigger |
6 |
3Y |
Output pin of the 3rd Schmitt trigger |
7 |
GND |
Ground pin |
8 |
4A |
Input pin of the 4th Schmitt trigger |
9 |
4Y |
Output pin of the 4th Schmitt trigger |
10 |
5A |
Input pin of the 5th Schmitt trigger |
11 |
5Y |
Output pin of the 5th Schmitt trigger |
12 |
6A |
Input pin of the 6th Schmitt trigger |
13 |
6Y |
Output pin of the 6th Schmitt trigger |
14 |
VCC |
Supply voltage pin |
Key Features & Specifications:
- Technology Family: TTL (Transistor-Transistor Logic)
- Max Supply Voltage: 7V
- Max Input Voltage: 7V
- Min VCC: 4.75V
- Max VCC: 5.25V
- Storage Temperature Range: -65ºC to +150ºC
- No. of Channels: 6 independent channels (each with a Schmitt trigger input and output)
- Inputs per Channel: 1
- Output Type: Push-Pull
- IOL (Max): 16mA (Low-level output current)
- IOH (Max): 0.8mA (High-level output current)
- Noise Immunity: Enhanced noise immunity due to Schmitt trigger operation, suitable for noisy environments
- Package Options: Available in multiple packages, including DIP-14, SO, SSOP, SOIP, and PDIP.
Applications:
The 74LS14 Schmitt Trigger Hex Inverter IC is widely used in the following applications:
- Noise Removal: Cleans up noisy signals in circuits, ensuring reliable digital operation.
- Signal Conditioning: Used to sharpen slow input signals, making them suitable for digital logic systems.
- Power Meters and Power Analyzers: In power measurement devices, the Schmitt trigger helps in ensuring stable, noise-free signal processing.
- Signal Converters: Converts slow or noisy analog signals into clean digital signals.
- Digital Systems: Used in systems requiring high noise immunity and stable, clean logic transitions.
Package Includes:
- 1 x 74LS14 Schmitt Trigger Hex Inverter IC (DIP-14)
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This product description provides key features and specifications of the 74LS14 Schmitt Trigger Hex Inverter IC, highlighting its noise immunity and versatility in various applications. It’s an ideal solution for noise filtering, signal conditioning, and reliable logic operation in digital systems
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