Logic - Comparators

Category Introduction

Products in the logic comparator family are used to generate an output based on comparison of information represented in a digital format; identity types indicate whether or not two inputs are identical, magnitude types also indicate which of the two inputs is greater when they are not identical. They are distinct from devices that compare the magnitude of two analog inputs, which are known as linear comparators and are catalogued separately.

Product List

43 Items

Mfr Part #	Quantity Available	UnitPrice	Series	Packaging	Product Status	Type	Number of Bits	Output	Output Function	Voltage - Supply	Current - Output High, Low	Max Propagation Delay @ V, Max CL	Current - Quiescent (Iq)	Operating Temperature	Package / Case	Supplier Device Package	Mounting Type
CD4063BE IC COMPARATOR MAGNITUDE 4B 16DIP Texas Instruments	1,613	$0.59	4000B	Tube	Active	Magnitude Comparator	4	Active High	AB	3V ~ 18V	4.2mA, 4.2mA	350ns @ 15V, 50pF	100 µA	-55°C ~ 125°C	16-DIP (0.300", 7.62mm)	16-PDIP	Through Hole
SN74HC688N IC COMPARATOR IDENTITY 8B 20DIP Texas Instruments	359	$1.54	74HC	Tube	Active	Identity Comparator	8	Active Low	A=B	2V ~ 6V	5.2mA, 5.2mA	36ns @ 6V, 50pF	8 µA	-40°C ~ 85°C	20-DIP (0.300", 7.62mm)	20-PDIP	Through Hole
LM393APS DUAL COMPARATOR Texas Instruments	3,843	$0.12		Bulk	Active	-	-	-	-	-	-	-	-	-	-	-	-
LM339ANS QUAD COMPARATOR Texas Instruments	1,392	$0.19		Bulk	Active	-	-	-	-	-	-	-	-	-	-	-	-
LMV331M5/MESN SINGLE COMPARATOR Texas Instruments	2,048	$0.28		Bulk	Active	-	-	-	-	-	-	-	-	-	-	-	-
SN74LS85DR IC COMPARATOR MAGNITUDE 16SOIC Texas Instruments	281	$1.45	74LS	Tape & Reel (TR)	Active	Magnitude Comparator	4	Active High	AB	4.75V ~ 5.25V	400µA, 8mA	45ns @ 5V, 15pF	-	0°C ~ 70°C	16-SOIC (0.154", 3.90mm Width)	16-SOIC	Surface Mount
74HC85DB,118 NEXPERIA 74HC85DB - MAGNITUDE CO Nexperia USA Inc.	1,098	$0.28		Bulk	Active	-	-	-	-	-	-	-	-	-	-	-	-
CD74HCT688E IC COMPARATOR IDENTITY 8B 20DIP Texas Instruments	6	$0.98	74HCT	Tube	Active	Identity Comparator	8	Active Low	A=B	4.5V ~ 5.5V	4mA, 4mA	34ns @ 4.5V, 50pF	8 µA	-55°C ~ 125°C	20-DIP (0.300", 7.62mm)	20-PDIP	Through Hole
SN74LS682N IC COMPARATOR MAGNITUDE 8B 20DIP Texas Instruments	73	$2.94	74LS	Tube	Active	Magnitude Comparator	8	Active Low	A=B, A>B	4.85V ~ 5.25V	400µA, 24mA	30ns @ 5V, 45pF	-	0°C ~ 70°C	20-DIP (0.300", 7.62mm)	20-PDIP	Through Hole
74HC688DB118 NOW NEXPERIA 74HC688DB IDENTITY NXP USA Inc.	2,458	$0.34	74HC	Bulk	Active	Identity Comparator	8	Active Low	A=B	2V ~ 6V	5.2mA, 5.2mA	29ns @ 6V, 50pF	8 µA	-40°C ~ 125°C	20-SSOP (0.209", 5.30mm Width)	20-SSOP	Surface Mount
SN74HC688PWR IC COMPARATOR IDENTITY 20TSSOP Texas Instruments	84	$1.31	74HC	Tape & Reel (TR)	Active	Identity Comparator	8	Active Low	A=B	2V ~ 6V	5.2mA, 5.2mA	36ns @ 6V, 50pF	8 µA	-40°C ~ 85°C	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP	Surface Mount
74HC688D,653 IC COMPARATOR MAGNITUDE 20SOIC Nexperia USA Inc.	396	$0.90	74HC	Tape & Reel (TR)	Active	Identity Comparator	8	Active Low	A=B	2V ~ 6V	5.2mA, 5.2mA	29ns @ 6V, 50pF	8 µA	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm Width)	20-SO	Surface Mount
74HC688D,652 IC COMPARATOR MAGNITUDE 20SOIC Nexperia USA Inc.	507	$0.00	74HC	Bulk	Obsolete	Identity Comparator	8	Active Low	A=B	2V ~ 6V	5.2mA, 5.2mA	29ns @ 6V, 50pF	8 µA	-40°C ~ 125°C	20-SOIC (0.295", 7.50mm Width)	20-SO	Surface Mount
SN74HC688DWR IC COMPARATOR IDENTITY 8B 20SOIC Texas Instruments	177	$1.47	74HC	Tape & Reel (TR)	Active	Identity Comparator	8	Active Low	A=B	2V ~ 6V	5.2mA, 5.2mA	36ns @ 6V, 50pF	8 µA	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm Width)	20-SOIC	Surface Mount
CD74HC85E IC COMPARATOR MAGNITUDE 4B 16DIP Texas Instruments	573	$1.32	74HC	Bulk	Active	Magnitude Comparator	4	Active High	AB	2V ~ 6V	5.2mA, 5.2mA	33ns @ 6V, 50pF	8 µA	-55°C ~ 125°C	16-DIP (0.300", 7.62mm)	16-PDIP	Through Hole
SN74HC688DW IC COMPARATOR IDENTITY 8B 20SOIC Texas Instruments	222	$1.58	74HC	Bulk	Active	Identity Comparator	8	Active Low	A=B	2V ~ 6V	5.2mA, 5.2mA	36ns @ 6V, 50pF	8 µA	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm Width)	20-SOIC	Surface Mount
74HC85D,653 IC COMPARATOR MAGNITUDE 16SOIC Nexperia USA Inc.	1,487	$0.64	74HC	Tape & Reel (TR)	Active	Magnitude Comparator	4	Active High	AB	2V ~ 6V	5.2mA, 5.2mA	33ns @ 6V, 50pF	8 µA	-40°C ~ 125°C	16-SOIC (0.154", 3.90mm Width)	16-SO	Surface Mount
74HC85D,652 IC COMPARATOR MAGNITUDE 16SOIC Nexperia USA Inc.	96	$0.00	74HC	Tube	Obsolete	Magnitude Comparator	4	Active High	AB	2V ~ 6V	5.2mA, 5.2mA	33ns @ 6V, 50pF	8 µA	-40°C ~ 125°C	16-SOIC (0.154", 3.90mm Width)	16-SO	Surface Mount
MC14585BDR2G IC COMP MAGNITUDE 4BIT 16-SOIC onsemi	55	$0.92	4000B	Tape & Reel (TR)	Active	Magnitude Comparator	4	Active High	AB	3V ~ 18V	4.2mA, 4.2mA	260ns @ 15V, 50pF	20 µA	-55°C ~ 125°C	16-SOIC (0.154", 3.90mm Width)	16-SOIC	Surface Mount
LM393APWLE DUAL COMPARATOR Texas Instruments	219	$0.00		Bulk	Active	-	-	-	-	-	-	-	-	-	-	-	-

About Logic Comparators

What are Logic Comparators?

Logic Comparators

Logic comparators are fundamental components in digital electronics that perform the function of comparing two binary numbers and determining their relative magnitudes. These devices output signals indicating whether one number is greater than, less than, or equal to the other. Operating on the principles of binary logic, logic comparators utilize a series of logic gates to evaluate the input signals. The basic operating principle involves comparing each corresponding bit of the two binary numbers, starting from the most significant bit, to determine the overall relationship between the numbers.

Types of Logic Comparators

1. Single-Bit Comparators

Single-bit comparators are the simplest form of logic comparators, designed to compare two single-bit binary numbers. They are primarily used in applications where only a basic comparison is needed, such as in simple control systems or basic digital circuits. These comparators typically use a combination of AND, OR, and NOT gates to produce outputs indicating equality or inequality.

2. Multi-Bit Comparators

Multi-bit comparators extend the functionality of single-bit comparators by comparing binary numbers with multiple bits. They are essential in more complex digital systems, such as microprocessors and memory devices, where larger data sets need to be compared. Multi-bit comparators can be cascaded to compare numbers of any length, making them versatile for various applications.

3. Magnitude Comparators

Magnitude comparators are specialized multi-bit comparators that not only determine equality but also identify which of the two binary numbers is greater or lesser. These comparators are widely used in arithmetic logic units (ALUs) and digital signal processing (DSP) systems, where precise magnitude comparisons are crucial for decision-making processes.

How to choose Logic Comparators?

When selecting logic comparators, several key parameters should be considered to ensure optimal performance and compatibility with the intended application:

Bit Width: Determine the number of bits the comparator needs to handle, based on the size of the binary numbers in your application.
Speed: Evaluate the propagation delay and switching speed to ensure the comparator meets the timing requirements of your system.
Power Consumption: Consider the power efficiency, especially in battery-operated or energy-sensitive applications.
Package Type: Choose a package that fits the physical constraints of your design, such as surface-mount or through-hole.
Temperature Range: Ensure the comparator can operate reliably within the environmental conditions of your application.

To evaluate product quality and reliability, review supplier datasheets, customer reviews, and industry certifications. Additionally, consider environmental factors such as humidity and electromagnetic interference, and ensure proper installation to prevent performance degradation.

Applications of Logic Comparators

1. Telecommunications

In the telecommunications industry, logic comparators are used in signal processing and data transmission systems to compare digital signals for error detection and correction. They play a crucial role in maintaining data integrity and ensuring efficient communication.

2. Consumer Electronics

Logic comparators are integral to consumer electronics, such as digital cameras and smartphones, where they assist in image processing and feature recognition. They enable devices to perform complex calculations and comparisons rapidly, enhancing user experience.

3. Automotive Industry

In automotive applications, logic comparators are employed in control systems for engine management, safety features, and infotainment systems. They help in making real-time decisions based on sensor data, improving vehicle performance and safety.

4. Industrial Automation

Logic comparators are used in industrial automation for process control and monitoring. They facilitate the comparison of sensor inputs to predefined thresholds, enabling automated systems to respond to changes in the production environment efficiently.

5. Computing and IT

In computing and IT, logic comparators are essential in CPUs and memory management units, where they perform critical tasks such as address decoding and data sorting. They contribute to the overall speed and efficiency of computing systems.