SN74LS169BD

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter/Shift Register
• Characteristics: High-speed, TTL Logic, Synchronous Operation
• Package: DIP (Dual In-line Package)
• Essence: 4-bit Synchronous Binary Up/Down Counter with Parallel Load
• Packaging/Quantity: Tube/25 pieces per tube

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 55 MHz
• Number of Bits: 4
• Logic Family: LS-TTL
• Counting Modes: Up, Down, Up/Down
• Parallel Load Input: Yes
• Reset Input: Yes
• Output Type: Standard
• Propagation Delay: 15 ns
• Power Dissipation: 500 mW

Detailed Pin Configuration

1. CP (Clock Pulse) - Clock input for counting operation
2. P0-P3 (Parallel Data Inputs) - Inputs for parallel loading
3. PL (Parallel Load) - Active low input for parallel loading
4. UD (Up/Down) - Determines the counting direction
5. MR (Master Reset) - Active low input for resetting the counter
6. Q0-Q3 (Outputs) - Outputs representing the count value
7. GND (Ground) - Ground reference
8. VCC (Supply Voltage) - Positive power supply

Functional Features

• Synchronous operation ensures accurate counting based on clock pulses.
• Can be used as a binary up counter, down counter, or both.
• Parallel load feature allows loading of initial count value.
• Master reset input enables resetting the counter to a specific state.
• High-speed operation with a maximum clock frequency of 55 MHz.
• LS-TTL logic family provides compatibility with other TTL devices.

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick counting applications. - Synchronous operation ensures accurate and reliable counting. - LS-TTL logic family provides compatibility with other TTL devices. - Parallel load feature enables easy initialization of the counter.

Disadvantages: - Limited to 4-bit counting, may not be suitable for applications requiring larger counters. - Requires an external clock source for proper operation.

Working Principles

The SN74LS169BD is a synchronous binary up/down counter that operates based on clock pulses. The counting direction (up or down) is determined by the UD input. When UD is high, the counter counts up, and when UD is low, it counts down. The CP input serves as the clock pulse input, and the counter advances one count on each rising edge of the clock signal.

The parallel load feature allows the initial count value to be loaded through the P0-P3 inputs when the PL input is low. This feature is useful when a specific count value needs to be set initially. The MR input is used to reset the counter to a specific state when activated.

The outputs Q0-Q3 represent the current count value. These outputs can be connected to other circuitry for further processing or display purposes.

Detailed Application Field Plans

The SN74LS169BD can be used in various applications, including:

1. Digital Counters: The IC can be used in digital counters for applications such as frequency measurement, event counting, and timekeeping.
2. Industrial Control Systems: It can be utilized in industrial control systems for tasks like position sensing, motor control, and process monitoring.
3. Communication Systems: The IC can be employed in communication systems for functions like data synchronization, channel selection, and signal routing.
4. Test and Measurement Equipment: It can be integrated into test and measurement equipment for tasks like signal analysis, waveform generation, and data acquisition.

Detailed and Complete Alternative Models

1. SN74LS169B: Similar to SN74LS169BD but in a different package (SOIC).
2. CD74HC169E: 4-bit synchronous up/down counter with parallel load, operates at higher clock frequencies.
3. MC14516B: 4-bit synchronous binary up/down counter with parallel load, compatible with CMOS logic family.

These alternative models offer similar functionality and can be considered as replacements for the SN74LS169BD depending on specific requirements and availability.

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