DM74LS85N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Arithmetic Logic Unit (ALU)
• Characteristics: 4-bit magnitude comparator
• Package: DIP (Dual In-line Package)
• Essence: Performs comparison operations on two 4-bit binary numbers
• Packaging/Quantity: Available in packs of 10 or 25 units

Specifications

• Supply Voltage: 5V
• Logic Family: LS-TTL
• Number of Inputs: 8
• Number of Outputs: 3
• Propagation Delay: 15 ns
• Operating Temperature Range: -55°C to +125°C

Detailed Pin Configuration

The DM74LS85N has a total of 16 pins, which are assigned as follows:

1. A0: Input A0
2. A1: Input A1
3. A2: Input A2
4. A3: Input A3
5. B0: Input B0
6. B1: Input B1
7. B2: Input B2
8. B3: Input B3
9. GND: Ground
10. LT: Less Than Output
11. EQ: Equal Output
12. GT: Greater Than Output
13. VCC: Supply Voltage
14. NC: No Connection
15. NC: No Connection
16. NC: No Connection

Functional Features

The DM74LS85N is a 4-bit magnitude comparator that compares two 4-bit binary numbers (A and B) and provides three outputs indicating the relationship between the two numbers. The "LT" output goes high if A < B, the "EQ" output goes high if A = B, and the "GT" output goes high if A > B.

Advantages and Disadvantages

Advantages: - High-speed operation - Wide operating temperature range - Compact DIP package for easy integration - Low power consumption

Disadvantages: - Limited to 4-bit comparison - Requires external circuitry for cascading multiple comparators

Working Principles

The DM74LS85N utilizes a combination of logic gates to perform the comparison operation. It compares each corresponding pair of bits from inputs A and B, starting from the most significant bit (MSB) down to the least significant bit (LSB). The outputs LT, EQ, and GT are determined based on the comparison results at each bit position.

Detailed Application Field Plans

The DM74LS85N is commonly used in various applications that require binary number comparison, such as:

1. Digital arithmetic circuits
2. Microprocessor systems
3. Data processing units
4. Control systems
5. Communication devices

Detailed and Complete Alternative Models

1. SN74LS85N: Similar 4-bit magnitude comparator IC from Texas Instruments.
2. CD74HC85E: 4-bit magnitude comparator IC with higher speed and lower power consumption.
3. MC14585B: CMOS 4-bit magnitude comparator IC with improved noise immunity.

These alternative models offer similar functionality and can be used as replacements for the DM74LS85N depending on specific requirements.

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