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.
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