Part Number: 74HCT27
Function: Triple 3-input NOR gate
Package: DIP, SO, SSOP, TSSOP, DHVQFN 14 Pin
Manufacturer: NXP Semiconductors.
Image
Description
The 74HC27, 74HCT27 is a triple 3-input NOR gate. Inputs include clamp diodes. This enables the use of current limiting resistors tointerface inputs to voltages in excess of VCC.
A NOR gate is a logic gate that produces an output of logic 1 (true) only when all of its inputs are at logic 0 (false). In other words, the output of a NOR gate is the logical negation of the OR gate.
The symbol for a NOR gate is a circle with an inverted triangle at its input, and its Boolean expression is represented as:
Output = ~(A + B)
Where A and B are the inputs to the gate, and the “+” sign represents the logical OR operation.
Where the double negation (~) represents a logical NOT operation, and the “+” sign represents the logical OR operation.
NOR gates are also used in memory circuits, such as dynamic random-access memory (DRAM), where they are used to control the read and write operations. In summary, a NOR gate is a logic gate that produces an output of logic 1 only when all of its inputs are at logic 0.
Pinouts:
Features
1. Complies with JEDEC standard no. 7A
2. Input levels:
(1) For 74HC27: CMOS level
(2) For 74HCT27: TTL level
3. ESD protection:
(1) HBM JESD22-A114F exceeds 2000 V
(2) MM JESD22-A115-A exceeds 200 V
4. Multiple package options
Other data sheets are available within the file: 74HC27, 74HC27BQ, 74HC27D, 74HC27DB, 74HC27N
74HCT27 Datasheet PDF Download
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