74LS13 Dual 4 - Input Schmitt Trigger/ Hex Inverter IC

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74LS13 is a Dual 4 – input Schmitt triggers hex 8-bit inverter IC belonging to the 74XXYY IC Series. The 74LS13 is a TTL (Transistor to Transistor Logic) which uses low power Shottky transistors to reduce the stored charge and get higher switching speeds than with conventional bipolar transistors. IC 74LS13 uses a single power supply to all the triggers and can be used to operate with any TTL based device.

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What is a Schmitt Trigger?

Schmitt Trigger is one the comparator-based circuit which gives the output on the based the previous output. In Schmitt Trigger the input value can be analog or digital but the output will be in two forms 1 or 0. Any circuit is convertible to Schmitt trigger by applying a positive feedback system. In a Schmitt Trigger circuit, the threshold is being used to get output. When the value is higher than the threshold the output will be HIGH otherwise it will be considered in the LOW state. These circuits are not only used to convert analog to digital, but it also helps to remove the noise from the signal.

74LS13 Key Features & Specs

Max Supply Voltage: 7V
Max Input Voltage: 7V
Storage Temperature Range: -65ºC to +150ºC
No. of Channels: 2
Inputs per channel: 4
IOL (Max): 16mA
IOH (Max): 0.8mA
Input type: Bipolar
Output type: Push-Pull

74LS13 Pinout

Pin No	Pin Name	Description
1	A1	INPUT 1 of GATE 1
2	B1	INPUT 2 of GATE 1
3	NC	Not Used
4	C1	INPUT 3 of GATE 1
5	D1	INPUT 4 of GATE 1
6	Q1	OUTPUT of GATE 1
7	GND	Ground
8	Q2	OUTPUT of GATE 2
9	A2	INPUT 1 of GATE 2
10	B2	INPUT 2 of GATE 2
11	NC	Not Used
12	C2	INPUT 3 of GATE 2
13	D2	INPUT 4 of GATE 2
14	Vcc	Chip Supply Voltage