This article is about NOR in the sense of an electronic logic gate (e.g. CMOS 4001). For NOR in the purely logical sense, see Logical NOR. For other uses of NOR or Nor, see Nor (disambiguation).
"4001" redirects here. For the year, see 5th millennium. For the ROM for the Intel 4004 processor, see Intel 4001.
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NOR gate truth table
Input
Output
A
B
A NOR B
0
0
1
0
1
0
1
0
0
1
1
0
The NOR gate is a digital logic gate that implements logical NOR - it behaves according to the truth table to the right. A HIGH output (1) results if both the inputs to the gate are LOW (0); if one or both input is HIGH (1), a LOW output (0) results. NOR is the result of the negation of the OR operator. It can also in some senses be seen as the inverse of an AND gate. NOR is a functionally complete operation—NOR gates can be combined to generate any other logical function. It shares this property with the NAND gate. By contrast, the OR operator is monotonic as it can only change LOW to HIGH but not vice versa.
In most, but not all, circuit implementations, the negation comes for free—including CMOS and TTL. In such logic families, OR is the more complicated operation; it may use a NOR followed by a NOT. A significant exception is some forms of the domino logic family.
The NORgate is a digital logic gate that implements logical NOR - it behaves according to the truth table to the right. A HIGH output (1) results if both...
The XNOR gate (sometimes ENOR, EXNOR, NXOR, XAND and pronounced as Exclusive NOR) is a digital logic gate whose function is the logical complement of the...
property with the NORgate. Digital systems employing certain logic circuits take advantage of NAND's functional completeness. NAND gates with two or more...
related to XOR gates. Exclusive or AND gate OR gate Inverter (NOT gate) NAND gateNORgate XNOR gate IMPLY gate Boolean algebra Logic gate Broesch, James...
AND gates 12-input AND gate from NAND and NORgates Wikimedia Commons has media related to AND gates. OR gate NOT gate NAND gateNORgate XOR gate XNOR...
A NORgate or a NOT OR gate is a logic gate which gives a positive output only when both inputs are negative. Like NAND gates, NORgates are so-called...
inputs and outputs. A NAND gate is equivalent to an OR gate with negated inputs, and a NORgate is equivalent to an AND gate with negated inputs. This...
two-input NORgate can be found to be g = 5/3. Due to the lower logical effort, NAND gates are typically preferred to NORgates. For larger gates, the logical...
A similar case applies to the NOR function, and this is referred to as NOR logic. A NAND gate is an inverted AND gate. It has the following truth table:...
alpha-3 code: NOR) Logical NOR ("Not OR"), a binary operation in logic NORgate, an electronic gate that implements a logical NORNOR logic NOR flash, a type...
Apollo Guidance Computer, was constructed entirely using NORgates with three inputs. The NOR operation is a logical operation on two logical values, typically...
twelve NORgates in all: six 2-input gates and two 1-input gates to produce u in 5 gate delays, plus three 2-input gates and one 3-input gate to produce...
flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. Both use the same cell design, consisting of floating gate MOSFETs. They...
and { NOR } is functionally complete. However, the set { AND, OR } is incomplete, due to its inability to express NOT. A gate (or set of gates) that is...
logic gates.[citation needed] NORgates are universal logic gates from which any other gate can be made, though at the cost of using more gates. The computer...
{\displaystyle ({\overline {C}}\vee {\overline {A}})\wedge (C\vee A)} The NORgate is operating properly when the following conditions hold: if the output...
NAND gate. Connecting two transistors in parallel forms the NORgate. Connecting a NOT gate to a NAND gate forms the AND gate. Connecting a NOT gate to...
Commons has media related to IMPLY_gates. NIMPLY gate AND gate NOT gate NAND gateNORgate XOR gate XNOR gate Boolean algebra (logic) Logic gates v t e...
voltage at the output, representing the zero. As an example, here is a NORgate implemented in schematic NMOS. If either input A or input B is high (logic...
relation to the dimensions on the integrated circuit; neither gate length, nor metal pitch, norgate pitch on a "32nm" device is thirty-two nanometers. The "28...
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