Logic Comparators

Logic comparators, also known as binary comparators and digital comparators are semiconductor logic ICs (integrated circuits) that has been designed as a combinational circuit for the testing of values represented by one binary word.

What are Logic Comparators?

Logic comparators test whether the value is greater than, less than, or equal to the value represented by another binary word. These devices are used commonly in digital logic circuit design and are also utilised in other key logic circuits.

Types of logic comparators

There are two main types of logic comparators and they are;

  • Magnitude comparators - These devices have two outputs, 1 that is logic where object A has a greater value than value B and are used to indicate equality.
  • Identity comparators - Identity comparators are devices that compare two binary numbers that has a singular output

Logic comparators are also offered with a variety of configurations such as Number of Bits configured on to the IC, varied maximum operating supply voltage and different output types such as push pull and TTL (Transistor–transistor logic)

Applications of logic comparators

These ICs have a range of application use such as;

  • Process controllers
  • Servo-motor control
  • Correction and/or detection of instrumentation conditions
  • Logic in CPU’s

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Description Price Logic Family Logic Function Output Function Number of Bits Output Type Polarity Mounting Type Package Type Pin Count Maximum High Level Output Current Maximum Low Level Output Current Maximum Propagation Delay Time @ Maximum CL Dimensions Height
RS Stock No. 170-8068
Mfr. Part No.74HC688D,652
BrandNexperia
£0.419
Each (In a Tube of 38)
Units
74HC Magnitude Comparator A=B 8 Single Ended Inverting Surface Mount SO 20 -5.2mA 5.2mA 255 ns @ 50 pF 13 x 7.6 x 2.45mm 2.45mm
RS Stock No. 145-6299
Mfr. Part No.SN74ALS521N
£1.336
Each (In a Tube of 20)
Units
ALS Identity Comparator A=B 8 Push-Pull Inverting Through Hole PDIP 20 -2.6mA 24mA 20 ns @ 5.5 V 24.33 x 6.35 x 4.57mm 4.57mm
RS Stock No. 442-779
Mfr. Part No.SN74ALS521N
£1.56
Each
Units
ALS Identity Comparator A=B 8 Push-Pull Inverting Through Hole PDIP 20 -2.6mA 24mA 20 ns @ 5.5 V 24.33 x 6.35 x 4.57mm 4.57mm