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74266 Quad 2-Input Exclusive-NOR Gates

25.00 EGP

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SKU:6895196387202

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.

74HC266 chip and pinout
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 # Type Description
1 Input Input to the first XNOR gate.
2 Input Input to the first XNOR gate.
3 Output Open-collector output from the first XNOR gate.
4 Input Input to the second XNOR gate.
5 Input Input to the second XNOR gate.
6 Output Open-collector output from the second XNOR gate.
7 Power Connect to ground (GND).
8 Output Open-collector output from the third XNOR gate.
9 Input Input to the third XNOR gate.
10 Input Input to the third XNOR gate.
11 Output Open-collector output from the fourth XNOR gate.
12 Input Input to the fourth XNOR gate.
13 Input Input to the fourth XNOR gate.
14 Power Positive power supply (VCC). Connect to +5V power.
Technical Specifications
Physical
Case/Package PDIP
Contact Plating Gold
Mount Through Hole
Number of Pins 14
Technical
High-Level Output Current -100 µA
Logic Function XNOR
Low-Level Output Current 8 mA
Max Operating Temperature 70 °C
Max Output Current 8 mA
Max Supply Voltage 5.25 V
Min Operating Temperature 0 °C
Min Supply Voltage 4.75 V
Number of Bits 4
Number of Channels 4
Number of Circuits 4
Number of Elements 4
Number of Gates 4
Number of Input Lines 2
Number of Inputs 2
Number of Output Lines 1
Number of Outputs 1
Operating Supply Voltage 5 V
Output Current 8 mA
Propagation Delay 30 ns
Quiescent Current 8 mA
Termination Through Hole
Turn-On Delay Time 30 ns
74266 Datasheet
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