74LS260 Dual 5-Input NOR Logic Gate IC

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74LS260 Dual 5 – Input NOR Gate IC is a member of the 74XXYY IC series. The 74LS260 is a TTL (Transistor to Transistor Logic) which uses low power Schottky transistors to reduce the stored charge and get higher switching speeds than with conventional bipolar transistors. The output of the IC always comes in Push-Pull configuration which makes it easy to work with other TTL devices and microcontrollers. The Strobe input forces the output of the NOR gate to go high when the strobe is low. The strobe input is used to ‘strobe’ or toggle the output.

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What is a NOR Logic Gate?

An OR gate followed by a NOT gate in a cascaded condition is called a NOR gate. The inclusive NOR (Not – OR) gate has an output that is normally at logic level “1” and only goes “LOW” to a logic level “0” when any of its inputs are at logic level “1”. The Logic NOR Gate is the reverse or complementary form of the inclusive OR gate.

74LS260 Pinout

74LS260 Pin Configuration

Pin No	Pin Name	Description
1	A3	INPUT 3 of NOR GATE 1
2	A2	INPUT 2 of NOR GATE 1
3	A1	INPUT 1 of NOR GATE 1
4	B1	INPUT 1 of NOR GATE 2
5	Q1	OUTPUT of NOR GATE 1
6	Q2	OUTPUT of NOR GATE 2
7	GND	Ground Pin
8	B5	INPUT 5 of NOR GATE 2
9	B4	INPUT 4 of NOR GATE 2
10	B3	INPUT 3 of NOR GATE 2
11	B2	INPUT 2 of NOR GATE 2
12	A5	INPUT 5 of NOR GATE 1
13	A4	INPUT 4 of NOR GATE 1
14	Vcc	Chip Supply Voltage