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74266 Quad 2-Input Exclusive-NOR Gates DIP-14

Original price was: 25.00 EGP.Current price is: 20.00 EGP.

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SKU:6895196387202
74266 Quad 2-Input Exclusive-NOR Gates

The 74×266 is a chip with four open-collector XNOR gates. This type of output makes it simple to connect it to other chips that use different logic levels. But it also means you can’t use this chip as a direct replacement for a normal XNOR gate chip.

In this guide, you will learn all about this chip and how you can use its XNOR gates in your own circuit.

What does the 74LS266 do?

The 74×266 gives you four open-collector XNOR gates that can be used individually. An XNOR gate is a logic gate that outputs 1 (HIGH) if its inputs are equal (both 1 or both 0). In the truth table below, you can see what the output will be for any given input:

XNOR gate truth table
The truth table for the XNOR gate
How To Use This Chip

The 74Ls266 comes in a 14-pin package, and you need to connect it to power before you can use it. Most 7400 ICs support a VCC voltage of 5V. One difference between the HC and LS versions of the chip is that the 74HC266 supports 2V to 6V, while the 74LS266 only supports 5V.

Once it’s connected, you can use any of the four open-collector XNOR gates inside.

7400 series IC connected to 5V on a breadboard
The 74HC266/74LS266 IC connected to power

This chip uses open-collector outputs. That means you can only sink current (current can flow into the chip), not source it (current cannot flow out of the chip).

Each gate output of the 74HC266 can sink about 4 mA when powered with 5V. While the 74LS266 can usually sink about 8 mA of current. These values can vary between manufacturers of the chip though.

74×266 Pinout

The 74×266 has 14 pins and contains four open-collector XNOR gates laid out as shown in the pinout diagram below. Each gate has the open-collector symbol, to remind you of the type of output:

Pin #TypeDescription
1InputInput to the first XNOR gate.
2InputInput to the first XNOR gate.
3OutputOpen-collector output from the first XNOR gate.
4InputInput to the second XNOR gate.
5InputInput to the second XNOR gate.
6OutputOpen-collector output from the second XNOR gate.
7PowerConnect to ground (GND).
8OutputOpen-collector output from the third XNOR gate.
9InputInput to the third XNOR gate.
10InputInput to the third XNOR gate.
11OutputOpen-collector output from the fourth XNOR gate.
12InputInput to the fourth XNOR gate.
13InputInput to the fourth XNOR gate.
14PowerPositive power supply (VCC). Connect to +5V power.
Technical Specifications
Physical
Case/PackagePDIP
Contact PlatingGold
MountThrough Hole
Number of Pins14
Technical
High-Level Output Current-100 µA
Logic FunctionXNOR
Low-Level Output Current8 mA
Max Operating Temperature70 °C
Max Output Current8 mA
Max Supply Voltage5.25 V
Min Operating Temperature0 °C
Min Supply Voltage4.75 V
Number of Bits4
Number of Channels4
Number of Circuits4
Number of Elements4
Number of Gates4
Number of Input Lines2
Number of Inputs2
Number of Output Lines1
Number of Outputs1
Operating Supply Voltage5 V
Output Current8 mA
Propagation Delay30 ns
Quiescent Current8 mA
TerminationThrough Hole
Turn-On Delay Time30 ns
74266 Datasheet
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