The XNOR gate (sometimes spelled "exnor" or "enor" and rarely written NXOR) is a digital logic gate whose function is the logical complement of the exclusive OR (XOR) gate. The two-input version implements logical equality, behaving according to the truth table to the right. A HIGH output (1) results if both of the inputs to the gate are the same. If one but not both inputs are HIGH (1), a LOW output (0) results.
There are 2 symbols for XNOR gates: the 'distinctive' symbol and the 'rectangular' symbol. For more information see Logic Gate Symbols. The ANSI symbol for the XNOR gate is a standard XOR gate with an inversion bubble connected.
The XNOR gate with inputs A and B implements the logical expression .
XNOR gates are represented in most TTL and CMOS IC families. The standard 4000 series CMOS IC is the 4077 and the TTL IC is the 74266. Both include four independent, two-input, XNOR gates. The pinout diagram is as follows:
This device is available from most semiconductor manufacturers such as NXP. It is usually available in both through-hole DIP and SOIC format. Datasheets are readily available in most datasheet databases. DIL is a Dual In Line package, and SIL is a Single In Line package.
Sinner
Down in the old castle out in the swamps
Darkness drops all over the land
The clock strikes twelve
The midnight masked-ball ... is about to begin
[Chorus:]
Masquearde
Living in a masquerade
In the middle of all those people (people)
I couldn't believe what I saw
Cat's eyes behind a silver mask
She was the one ... I was searching for
[Chorus (2)]
With her eyes flashing she runs away
A stranger grabs me
He screams "Just wait and see"
But I found the girl, ripped off her silver mask
[Chorus (2)]