SN74LS399N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Storage and Control
• Characteristics: 8-Bit Latch/Shift Register with 3-State Outputs
• Package: DIP (Dual In-line Package)
• Essence: The SN74LS399N is a versatile IC that combines the functionality of an 8-bit latch and a shift register, with the added feature of 3-state outputs.
• Packaging/Quantity: Available in tubes or reels, with varying quantities depending on the supplier.

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Input Voltage High: 2V (min), 0.8V (max)
• Input Voltage Low: 0.8V (min), 0.4V (max)
• Output Voltage High: 2.7V (min), 2.4V (max)
• Output Voltage Low: 0.5V (max)

Detailed Pin Configuration

The SN74LS399N has a total of 20 pins, which are divided into various functional groups:

1. GND: Ground pin
2. Q0-Q7: Outputs for the 8-bit latch/shift register
3. SER: Serial data input
4. S0-S3: Shift control inputs
5. OE: Output enable input
6. MR: Master reset input
7. QA-QH: 3-state output buffers

Functional Features

• Combination of Latch and Shift Register: The SN74LS399N can function as an 8-bit latch or a shift register, providing flexibility in data storage and control applications.
• 3-State Outputs: The 3-state outputs allow multiple devices to share a common bus without interfering with each other, enhancing system efficiency.
• Master Reset: The master reset input (MR) allows for the simultaneous clearing of all registers, ensuring a controlled start-up state.
• Shift Control Inputs: The shift control inputs (S0-S3) enable various modes of operation, such as parallel loading, serial shifting, and cascading multiple devices.

Advantages and Disadvantages

Advantages: - Versatility: Combines latch and shift register functionality in a single IC. - 3-State Outputs: Facilitates bus sharing and improves system efficiency. - Easy Integration: Compatible with other TTL logic families, making it easy to incorporate into existing designs.

Disadvantages: - Limited Output Current: The SN74LS399N has a relatively low output current capability, which may restrict its use in certain high-current applications. - Power Consumption: Compared to more modern ICs, the SN74LS399N may consume more power due to its older technology.

Working Principles

The SN74LS399N operates based on the principles of digital logic. It consists of flip-flops that can store data and shift it through the register. The shift control inputs determine the mode of operation, allowing data to be loaded in parallel or shifted serially. The 3-state outputs enable the device to drive external circuitry without causing conflicts on shared buses.

Detailed Application Field Plans

The SN74LS399N finds applications in various fields, including:

1. Data Storage Systems: Used in memory units and data registers for temporary storage and retrieval of information.
2. Serial-to-Parallel Conversion: Converts serial data streams into parallel formats, enabling efficient processing by other components.
3. Bus Sharing: Facilitates communication between multiple devices connected to a common bus, such as in microcontrollers and computer systems.
4. Shift Register Applications: Used in applications requiring sequential data shifting, such as LED displays, counters, and frequency dividers.

Detailed and Complete Alternative Models

1. SN74LS595: 8-bit shift register with output latches and 3-state outputs.
2. CD4094: 8-bit serial-in, parallel-out shift register with 3-state outputs.
3. 74HC595: 8-bit shift register with output latches and 3-state outputs, compatible with CMOS logic families.

These alternative models offer similar functionality to the SN74LS399N and can be used as replacements in various applications.

Word count: 511 words