74LS28 Quad 2 - Input NOR Buffer IC

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74LS27 IC is a member of the 74XXYY IC series. It has 4 (Quad) NOR gates in the chip and each gate have two inputs, hence the name Quad 2 – Input NOR Gate. The 74LS28 IC has a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC 74LS28 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.

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What is NOR Gate?

An OR gate followed by a NOT gate in a cascade 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.

74LS28 Key Features & Specifications

Max Supply Voltage 5.5V
Max Input Voltage 2V
TTL outputs
Maximum ESD: 3.5KV
Operating voltage range: +4.75V to +5.25V
Low power consumption
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range -65°C to +150°C

74LS28 Pinout

Pin No.	Pin Name	Description
1	1Y	Output of gate 1
2	1A	Input of Gate 1
3	1B	Input of Gate 1
4	2Y	Output of gate 2
5	2A	Input of Gate 2
6	2B	Input of Gate 2
7	GND	Ground
8	3A	Input of Gate 3
9	3B	Input of Gate 3
10	3Y	Output of gate 3
11	4A	Input of Gate 4
12	4B	Input of Gate 4
13	4Y	Output of gate 4
14	Vcc	Chip Supply Voltage