SN74LS85 4-Bit Magnitude Comparator – Texas Instruments DIP-16

Overview: SN74LS85 4-Bit Binary Magnitude Comparator

De SN74LS85 van Texas Instrumenten is a high-speed 4-bit magnitude comparator that compares two 4-bit binary numbers (A and B). The comparator outputs indicate whether A is greater than, equal to, or less than B. Designed using low-power Schottky logic, this device ensures fast switching speeds and low power consumption in digital logic systems.

This device is commonly deployed in systems requiring fast binary sorting, equality checks, and hierarchical logic comparisons. The SN74LS85 allows cascading with additional comparators to handle wider bit-width operations, making it a modular and scalable solution for digital arithmetic and control circuits.

Key Electrical Characteristics and Functional Diagram

Parameter	Waarde	Eenheid
Functie	4-Bit Magnitude Comparator	–
Pakket	DIP-16	–
Input Type	TTL-compatibel	–
Type uitvoer	TTL Logic	–
Bedrijfsspanning	4.75 to 5.25	V
Mounting Type	Through Hole	–
Cascading Support	Ja	–

Advantages over Conventional Comparators

The SN74LS85 offers high-speed TTL-compatible outputs ideal for integration with mainstream logic circuits. Its capability to cascade multiple units enables designers to extend comparison beyond four bits without degrading system timing.

Unlike simpler equality-only comparators, this device simultaneously delivers less-than, equal-to, and greater-than outputs, which simplifies circuit logic and saves board space. Its open-architecture logic further improves design flexibility, whether in state machines or address decoders. Certified engineers regularly choose SN74LS85 for its reliability in clocked and asynchronous control systems.

Engineers across industrial computing, instrumentation, and educational kits continue to trust SN74LS85. Procure this comparator from IC-fabrikant for assured quality and availability in your next design cycle.

Detailed Technical Specifications

Specificatie	Details
Input Width	4-Bit (A[3:0] and B[3:0])
Output Logic	Greater Than, Equal, Less Than
Logische familie	LS (Low Power Schottky)
Voltage Supply Range	4.75V to 5.25V
Temperatuurbereik	0 tot 70°C
Cascading Inputs/Outputs	Supported
Type verpakking	Dual In-Line Package (DIP-16)

Typical Applications for the SN74LS85

• Binary sorting and prioritization circuits
• Microprocessor address decoders
• Digital comparators in ALUs
• Real-time decision-making in robotics
• Digital fault detection in instrumentation

Veelgestelde vragen (FAQ)

What is the main use of SN74LS85 in digital systems?

This device is commonly used for comparing two 4-bit binary numbers to determine which one is greater, less, or equal, simplifying digital sorting and control logic in real-time systems.

Can the SN74LS85 be used for comparing more than 4 bits?

Yes, the device features cascading inputs and outputs, which allow multiple SN74LS85 units to be connected in series to compare binary numbers greater than 4 bits wide.

Is this comparator compatible with CMOS logic?

No, the SN74LS85 is designed for TTL logic compatibility. Interfacing with CMOS logic would require level shifters or additional logic buffers to ensure correct voltage translation.

Why is the LS logic family important in this device?

LS stands for Low Power Schottky, which ensures faster switching and reduced power consumption compared to older TTL designs, making it ideal for energy-conscious digital systems.

Where is SN74LS85 typically applied?

This device is used in embedded control systems, instrumentation equipment, address decoding, binary sorters, and comparator modules in teaching labs and industrial automation.