DM74ALS521WM

Product Overview

• Category: Integrated Circuit (IC)
• Use: Digital Logic
• Characteristics: High-speed, low-power, 8-bit identity comparator
• Package: 20-pin wide SOIC (Small Outline Integrated Circuit)
• Essence: Comparing two 8-bit binary numbers and providing output based on the comparison result
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature: -40°C to +85°C
• Input Voltage Levels: TTL compatible
• Propagation Delay: 9ns (typical)
• Output Current: ±24mA
• Power Dissipation: 500mW (max)

Detailed Pin Configuration

The DM74ALS521WM has a total of 20 pins, which are assigned as follows:

1. A0: Input pin for the least significant bit (LSB) of the first 8-bit number
2. A1: Input pin for the second bit of the first 8-bit number
3. A2: Input pin for the third bit of the first 8-bit number
4. A3: Input pin for the fourth bit of the first 8-bit number
5. A4: Input pin for the fifth bit of the first 8-bit number
6. A5: Input pin for the sixth bit of the first 8-bit number
7. A6: Input pin for the seventh bit of the first 8-bit number
8. A7: Input pin for the most significant bit (MSB) of the first 8-bit number
9. B0: Input pin for the LSB of the second 8-bit number
10. B1: Input pin for the second bit of the second 8-bit number
11. B2: Input pin for the third bit of the second 8-bit number
12. B3: Input pin for the fourth bit of the second 8-bit number
13. B4: Input pin for the fifth bit of the second 8-bit number
14. B5: Input pin for the sixth bit of the second 8-bit number
15. B6: Input pin for the seventh bit of the second 8-bit number
16. B7: Input pin for the MSB of the second 8-bit number
17. GND: Ground reference
18. O0: Output pin indicating equality of the two input numbers
19. O1: Output pin indicating the first number is greater than the second
20. VCC: Positive supply voltage

Functional Features

• Performs an 8-bit binary comparison between two numbers
• Provides three output states: equality, greater than, or less than
• High-speed operation with low propagation delay
• TTL compatible input voltage levels
• Wide operating temperature range

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick comparisons - Low-power consumption - Compact package size - Wide operating temperature range enables usage in various environments

Disadvantages: - Limited to 8-bit comparisons - Requires external circuitry for cascading multiple comparators

Working Principles

The DM74ALS521WM compares two 8-bit binary numbers by examining each corresponding bit pair. It determines whether the bits are equal, and if not, it identifies which number is greater. The result is indicated through the output pins O0 and O1.

Detailed Application Field Plans

The DM74ALS521WM can be used in various applications that involve comparing two 8-bit binary numbers. Some potential application fields include:

1. Microcontrollers and microprocessors
2. Digital signal processing
3. Data encryption and decryption systems
4. Arithmetic logic units (ALUs)
5. Error detection and correction circuits

Detailed and Complete Alternative Models

1. SN74ALS521: Similar 8-bit identity comparator IC from Texas Instruments
2. CD54/74HC85: 4-bit magnitude comparator IC from Texas Instruments
3. MC14585B: 4-bit magnitude comparator IC from ON Semiconductor
4. 74F521: 8-bit identity comparator IC from Fairchild Semiconductor

These alternative models offer similar functionality and can be considered as substitutes for the DM74ALS521WM.

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