SN74ALS621ADWR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Logic Gate
• Characteristics: Advanced Schottky (ALS) technology, 4-bit bus transceiver with 3-state outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: High-speed and low-power consumption logic gate
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 6ns (typical)
• Output Current: ±24mA
• Input Capacitance: 4pF
• Output Capacitance: 8pF

Detailed Pin Configuration

The SN74ALS621ADWR has a total of 20 pins arranged as follows:

1. A1 (Input A1)
2. B1 (Input B1)
3. G1 (Output Enable Input for Port A)
4. OE (Output Enable Input for Port B)
5. A2 (Input A2)
6. B2 (Input B2)
7. G2 (Output Enable Input for Port A)
8. VCC (Positive Power Supply)
9. B3 (Input B3)
10. A3 (Input A3)
11. G3 (Output Enable Input for Port B)
12. GND (Ground)
13. Y3 (Output Y3)
14. Y2 (Output Y2)
15. Y1 (Output Y1)
16. A4 (Input A4)
17. B4 (Input B4)
18. G4 (Output Enable Input for Port B)
19. NC (No Connection)
20. VCC (Positive Power Supply)

Functional Features

• 4-bit bidirectional bus transceiver
• Non-inverting outputs
• 3-state outputs for bus-oriented applications
• High-speed operation with minimal power consumption
• TTL-compatible inputs and outputs
• Schmitt-trigger input on all inputs
• ESD protection exceeds 2000V per MIL-STD-883C, Method 3015.2

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data transfer - Low power consumption helps in reducing energy usage - Schmitt-trigger input ensures noise immunity - ESD protection provides reliability in harsh environments

Disadvantages: - Limited to 4-bit bus transceiver functionality - Requires external pull-up resistors for proper operation

Working Principles

The SN74ALS621ADWR is a 4-bit bus transceiver that enables bidirectional data transfer between two buses. It operates by using the control signals G1 and G2 to enable the outputs Y1, Y2, Y3, and Y4. When G1 is high and G2 is low, data from Port A is transferred to Port B. Conversely, when G1 is low and G2 is high, data from Port B is transferred to Port A. The outputs are put in a high-impedance state when either G1 or G2 is low.

Detailed Application Field Plans

The SN74ALS621ADWR is commonly used in various applications, including:

1. Data communication systems
2. Microprocessor-based systems
3. Industrial control systems
4. Automotive electronics
5. Test and measurement equipment

Detailed and Complete Alternative Models

1. SN74ALS623ADWR: Similar to SN74ALS621ADWR but with inverted outputs
2. SN74ALS620ADWR: 4-bit bus transceiver with non-inverting outputs and active-high enable inputs
3. SN74ALS622ADWR: 4-bit bus transceiver with inverted outputs and active-low enable inputs

These alternative models provide similar functionality to the SN74ALS621ADWR but may have slight variations in characteristics or pin configuration.

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