SN74ALS166DR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Shift Register
• Characteristics: High-speed, TTL-compatible, 8-bit parallel-in/serial-out shift register
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Serial-to-parallel data conversion
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Input Voltage Levels: TTL compatible
• Output Voltage Levels: TTL compatible
• Maximum Clock Frequency: 25 MHz
• Number of Bits: 8
• Logic Family: ALS (Advanced Low-Power Schottky)

Detailed Pin Configuration

The SN74ALS166DR has a total of 16 pins, which are assigned 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. SH/LD (Shift/Load Input)
14. OE (Output Enable)
15. VCC (Supply Voltage)
16. QH' (Serial Output)

Functional Features

• High-speed operation allows for efficient data transfer.
• TTL compatibility ensures easy integration with other logic circuits.
• Parallel-in/serial-out functionality enables serial data conversion to parallel format.
• Master reset (MR) input allows for clearing the register to its initial state.
• Shift/load (SH/LD) input controls the shift and load operations.
• Output enable (OE) input enables or disables the parallel outputs.

Advantages and Disadvantages

Advantages: - High-speed operation facilitates rapid data transfer. - TTL compatibility ensures compatibility with other logic circuits. - Compact SOIC package allows for space-efficient integration. - Versatile functionality supports various applications.

Disadvantages: - Limited number of bits (8) may not be sufficient for certain applications requiring larger registers. - Requires external clock signal for proper operation.

Working Principles

The SN74ALS166DR is a synchronous, parallel-in/serial-out shift register. It receives data in parallel format through the serial data input (SER) pin. The clock input (CLK) controls the shifting of data from one stage to another. The shift/load (SH/LD) input determines whether the data is shifted or loaded into the register. The master reset (MR) input resets the register to its initial state.

When the SH/LD input is low, the register operates in the shift mode. In this mode, the data is shifted from the SER input to the QA-QH outputs on each rising edge of the clock signal. When the SH/LD input is high, the register operates in the load mode. In this mode, the data present at the SER input is loaded into the register on the rising edge of the clock signal.

The output enable (OE) input enables or disables the parallel outputs. When OE is low, the outputs are enabled and reflect the data stored in the register. When OE is high, the outputs are disabled and remain in a high-impedance state.

Detailed Application Field Plans

The SN74ALS166DR can be used in various applications, including:

1. Serial-to-parallel data conversion in communication systems.
2. Data storage and retrieval in memory devices.
3. Control signal generation in digital control systems.
4. Data synchronization in data acquisition systems.
5. Parallel data transfer in parallel processing systems.

Detailed and Complete Alternative Models

1. SN74ALS164N: 8-bit serial-in/parallel-out shift register with similar characteristics and functionality.
2. CD4015BE: Dual 4-stage static shift register with parallel/serial input and serial output.
3. 74HC595: 8-bit serial-in/serial or parallel-out shift register with output latches.

These alternative models offer similar functionality and can be used as substitutes for the SN74ALS166DR in various applications.

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