SN74ALS191AN

Product Overview

• Category: Integrated Circuit
• Use: Counter/Divider
• Characteristics: High-speed, synchronous, up/down counter
• Package: DIP (Dual In-line Package)
• Essence: TTL (Transistor-Transistor Logic) logic family
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 40 MHz
• Number of Bits: 4
• Counting Sequence: Up or Down
• Reset Function: Asynchronous
• Output Type: Synchronous

Detailed Pin Configuration

1. CLK (Clock Input)
2. UP/DOWN (Up/Down Control Input)
3. LOAD (Parallel Load Input)
4. D0 (Data Input 0)
5. D1 (Data Input 1)
6. D2 (Data Input 2)
7. D3 (Data Input 3)
8. GND (Ground)
9. Q0 (Output Bit 0)
10. Q1 (Output Bit 1)
11. Q2 (Output Bit 2)
12. Q3 (Output Bit 3)
13. RC (Ripple Carry Output)
14. CET (Count Enable Input)
15. MR (Master Reset Input)
16. VCC (Supply Voltage)

Functional Features

• High-speed operation allows for efficient counting and dividing.
• Synchronous design ensures accurate and reliable results.
• Up/Down control input enables flexible counting direction.
• Parallel load input facilitates easy initialization of the counter.
• Ripple carry output provides cascading capability for larger counters.
• Master reset input allows for immediate reset of the counter.

Advantages and Disadvantages

Advantages: - High-speed operation enables rapid counting applications. - Synchronous design ensures accurate and synchronized outputs. - Flexible counting direction provides versatility in various scenarios. - Parallel load input simplifies counter initialization. - Cascading capability allows for the construction of larger counters.

Disadvantages: - Limited to 4-bit counting, may not be suitable for applications requiring higher bit counts. - Requires external clock signal for proper operation. - Asynchronous reset function may introduce potential timing issues.

Working Principles

The SN74ALS191AN is a synchronous up/down counter that operates based on the input clock signal. The counting sequence can be set to either increment or decrement based on the state of the UP/DOWN control input. The counter can be initialized by loading data through the parallel load input. The output bits represent the current count value, while the ripple carry output can be used for cascading multiple counters. The master reset input allows for immediate reset of the counter to its initial state.

Detailed Application Field Plans

The SN74ALS191AN is commonly used in various applications that require counting or dividing functionality. Some specific application fields include:

1. Digital Frequency Counters: The high-speed operation and synchronous design make it suitable for frequency measurement applications.
2. Industrial Automation: The counter can be utilized for position monitoring, event counting, or timekeeping in industrial automation systems.
3. Communication Systems: It can be employed in communication equipment for tasks such as channel selection, frequency synthesis, or baud rate generation.
4. Test and Measurement Instruments: The counter's accuracy and reliability make it ideal for use in oscilloscopes, logic analyzers, or signal generators.

Detailed and Complete Alternative Models

1. SN74ALS190N: Similar to SN74ALS191AN but lacks the UP/DOWN control input.
2. SN74LS192N: A 4-bit synchronous up/down counter with additional features like carry lookahead and presettable counters.
3. CD40192BE: A 4-bit synchronous up/down counter with parallel load capability and asynchronous reset function.

These alternative models offer similar functionality to the SN74ALS191AN but may have additional features or different package options.

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