SN74ALS1645AN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Shift Register
• Characteristics: High-speed, TTL compatible, 8-bit parallel-in/serial-out shift register
• Package: DIP (Dual In-line Package)
• Essence: Serial-to-parallel data conversion
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Technology: Advanced Low-Power Schottky (ALS)
• Number of Bits: 8
• Logic Family: TTL (Transistor-Transistor Logic)
• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Output Drive Capability: 10 LSTTL Loads
• Maximum Clock Frequency: 100 MHz
• Propagation Delay: 9 ns (typical)

Detailed Pin Configuration

The SN74ALS1645AN has a total of 20 pins. The pin configuration is as follows:

1. SER (Serial Data Input)
2. CLK (Clock Input)
3. GND (Ground)
4. QA (Parallel Output A)
5. QB (Parallel Output B)
6. QC (Parallel Output C)
7. QD (Parallel Output D)
8. QE (Parallel Output E)
9. QF (Parallel Output F)
10. QG (Parallel Output G)
11. QH (Parallel Output H)
12. MR (Master Reset)
13. VCC (Supply Voltage)
14. QA' (Complementary Output A)
15. QB' (Complementary Output B)
16. QC' (Complementary Output C)
17. QD' (Complementary Output D)
18. QE' (Complementary Output E)
19. QF' (Complementary Output F)
20. QG' (Complementary Output G)

Functional Features

The SN74ALS1645AN is a high-speed, 8-bit parallel-in/serial-out shift register. It allows for the conversion of serial data to parallel data at a fast clock rate. The device operates on TTL logic levels and is compatible with a wide range of digital systems. It offers a maximum clock frequency of 100 MHz and has a low propagation delay of 9 ns.

Advantages and Disadvantages

Advantages: - High-speed operation - TTL compatibility - Easy integration into existing digital systems - Wide operating temperature range - Low power consumption

Disadvantages: - Limited number of output pins (8 bits) - Requires an external clock signal for operation

Working Principles

The SN74ALS1645AN works by shifting in serial data through the SER pin and converting it into parallel data at the QA to QH output pins. The CLK input controls the shifting of data from one stage to the next. On each rising edge of the clock signal, the input data is shifted into the first stage, and the previously stored data is shifted to the subsequent stages. The MR pin allows for a master reset, which clears all the outputs to a low state when activated.

Detailed Application Field Plans

The SN74ALS1645AN can be used in various applications that require serial-to-parallel data conversion. Some potential application fields include:

1. Data Communication Systems: The shift register can be used to convert serial data received from communication channels into parallel data for further processing.
2. Display Systems: It can be utilized to control LED or LCD displays, where parallel data is required to drive individual segments or pixels.
3. Industrial Automation: The device can be employed in control systems to handle serial data from sensors or other devices and convert it into parallel data for analysis and decision-making.
4. Test and Measurement Equipment: It can be used in instruments that require parallel data processing, such as oscilloscopes or logic analyzers.

Detailed and Complete Alternative Models

1. SN74ALS1645A: Similar to SN74ALS1645AN but with different package options (SOIC, TSSOP).
2. CD74HC164E: 8-bit parallel-in/serial-out shift register from Texas Instruments, compatible with CMOS logic levels.
3. 74HC595: 8-bit serial-in/parallel-out shift register with output latches, commonly used in LED matrix displays.

These alternative models offer similar functionality and can be considered as substitutes for the SN74ALS1645AN based on specific requirements and availability.

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