SN74LS191D

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter/Divider
• Characteristics: High-speed, synchronous, up/down counter
• Package: Dual-In-Line Package (DIP)
• Essence: Binary counter with parallel load and asynchronous reset
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 30MHz
• Number of Bits: 4
• Logic Family: LS-TTL
• Output Type: TTL
• Propagation Delay: 15ns (typical)

Detailed Pin Configuration

The SN74LS191D has a total of 16 pins, each serving a specific function:

1. CP (Clock Pulse): Input pin for clock signal.
2. P0-P3 (Parallel Data Inputs): Pins for loading the initial count value.
3. PL (Parallel Load): Input pin to enable parallel loading of data inputs.
4. UP/DN (Up/Down): Input pin to control the direction of counting.
5. MR (Master Reset): Input pin to asynchronously reset the counter.
6. CE (Count Enable): Input pin to enable/disable counting.
7. TC (Terminal Count): Output pin indicating when the counter reaches its maximum value.
8. QA-QD (Outputs): Four output pins representing the binary count.

Functional Features

• Synchronous operation: The counter advances on each clock pulse.
• Parallel load capability: Allows loading of an initial count value.
• Asynchronous reset: Provides the ability to reset the counter at any time.
• Up/Down control: Allows counting in both upward and downward directions.
• Terminal count output: Indicates when the counter reaches its maximum value.

Advantages and Disadvantages

Advantages: - High-speed operation - Flexible counting direction control - Parallel load capability for easy initialization - Asynchronous reset for quick counter reset

Disadvantages: - Limited to 4-bit counting range - Requires an external clock signal

Working Principles

The SN74LS191D is a synchronous up/down counter that operates based on the clock input. On each rising edge of the clock pulse, the counter advances by one count in the selected direction (up or down). The initial count value can be loaded through the parallel data inputs when the parallel load input is enabled. The counter can be asynchronously reset using the master reset input.

Detailed Application Field Plans

The SN74LS191D is commonly used in various applications, including:

1. Frequency division: Dividing an input frequency by a specific factor.
2. Event counting: Counting the occurrence of specific events.
3. Digital clocks: Implementing timekeeping functions.
4. Industrial automation: Monitoring and controlling processes.
5. Communication systems: Handling data transmission and reception.

Detailed and Complete Alternative Models

1. CD40193: 4-bit synchronous up/down counter with similar features.
2. MC14516B: 4-bit synchronous up/down counter with additional preset capability.
3. 74HC191: High-speed CMOS version of the 4-bit up/down counter.

These alternative models offer similar functionality and can be considered as replacements for the SN74LS191D.

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