IC 7486, XOR gate
An
The 7486 IC package contains four independent positive logic XOR GATES. Pins 14 and 7 provide power for all four logic gates.
IC 74266, XNOR gate
Basically the “Exclusive-NOR Gate” is a combination of the Exclusive-OR gate and the NOT gate but has a truth table similar to the standard NOR gate in that it has an output that is normally HIGH (1) and goes LOW (0) when any of its inputs are HIGH (1).
However, the output goes HIGH (1) only when both of its inputs are at the same logic level, either binary “1” or “0”. For example, “00” or “11”. The truth table, equivalent circuits, Boolean expression and symbol for XNOR gate are below.
The commonly used IC for XNOR gate are the 74266 (Quad 2-input gate with open collector output) and 747266 (Quad 2-input XNOR gate). The IC comprises of four independent 2-input exclusive-NOR gates with open-collector outputs which can be used a 4-Bit digital comparator. The open-collector outputs permit tying outputs together for multiple-bit comparisons.
IC 7447, BCD to seven segment decoder/driver IC
Pin No |
Function |
Name |
1 |
BCD Input 2 | A1 |
2 | BCD Input 3 | A2 |
3 | Display test (Active low) | LT |
4 | Ripple blanking output (Active low) | RBO |
5 | Ripple blanking input (Active low) | RBI |
6 | BCD Input 4 | A3 |
7 | BCD Input 1 | A0 |
8 | Ground (0V) | Ground |
9 | Segment outputs; Active low | e |
10 | d | |
11 | c | |
12 | b | |
13 | a | |
14 | g | |
15 | f | |
16 | Supply voltage; 5V (4.75V – 5.25V) |
Vcc |
The datasheet for 7447 IC is available at 7447 IC.
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