SN74ALS521DWE4

Product Overview

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

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 9ns (typical)
• Output Current: ±24mA
• Power Dissipation: 500mW

Detailed Pin Configuration

The SN74ALS521DWE4 has a total of 20 pins. The pin configuration is as follows:

1. A0: Input A bit 0
2. A1: Input A bit 1
3. A2: Input A bit 2
4. A3: Input A bit 3
5. A4: Input A bit 4
6. A5: Input A bit 5
7. A6: Input A bit 6
8. A7: Input A bit 7
9. B0: Input B bit 0
10. B1: Input B bit 1
11. B2: Input B bit 2
12. B3: Input B bit 3
13. B4: Input B bit 4
14. B5: Input B bit 5
15. B6: Input B bit 6
16. B7: Input B bit 7
17. GND: Ground
18. O: Output
19. VCC: Supply Voltage
20. G: Enable Input

Functional Features

The SN74ALS521DWE4 is a high-speed, low-power 8-bit identity comparator. It compares two 8-bit binary numbers (A and B) and provides an output based on the comparison result. The enable input (G) controls the operation of the comparator. When G is high, the comparator is enabled, and when G is low, the comparator is disabled.

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Compact SOIC package - Wide operating temperature range

Disadvantages: - Limited to 8-bit comparisons - Requires external enable signal for operation

Working Principles

The SN74ALS521DWE4 works by comparing each corresponding bit of the two 8-bit binary numbers (A and B). If the bits are equal, the output (O) is set to high. If any of the bits are not equal, the output is set to low. The enable input (G) determines whether the comparator is active or not. When G is high, the comparator performs the comparison, and when G is low, the output remains unchanged.

Detailed Application Field Plans

The SN74ALS521DWE4 can be used in various applications that require binary number comparison, such as:

1. Microcontrollers and CPUs: Comparing data stored in registers
2. Digital Signal Processing: Identifying equal or unequal values
3. Data Communication Systems: Error detection and correction
4. Arithmetic Logic Units (ALUs): Comparing operands for arithmetic operations
5. Memory Systems: Address decoding and selection

Detailed and Complete Alternative Models

1. SN74ALS521N: DIP (Dual Inline Package) version of SN74ALS521DWE4
2. SN74LS85: 4-bit magnitude comparator
3. SN74HC688: 8-bit magnitude comparator with enable input

These alternative models offer similar functionality and can be used as substitutes for the SN74ALS521DWE4 in different applications.

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