SN74LS191DE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter/Divider
• Characteristics: High-speed, synchronous, up/down counter
• Package: DIP-16 (Dual In-Line Package with 16 pins)
• Essence: A versatile counter/divider IC used in various digital applications
• Packaging/Quantity: Available in reels or tubes, quantity depends on manufacturer

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 25 MHz
• Maximum Counting Range: 0 to 15 (4-bit binary)
• Output Current: ±4 mA
• Propagation Delay: 15 ns (typical)

Detailed Pin Configuration

The SN74LS191DE4 has a total of 16 pins, each serving a specific function:

1. CLK (Clock Input)
2. UP/DOWN (Up/Down Control Input)
3. PRESET (Preset Input)
4. ENABLE (Enable Input)
5. B (Binary Input)
6. CARRY OUT (Carry Output)
7. A (Binary Input)
8. GND (Ground)
9. QA (Output A)
10. QB (Output B)
11. QC (Output C)
12. QD (Output D)
13. VCC (Positive Power Supply)
14. LOAD (Load Input)
15. CARRY IN (Carry Input)
16. RC (Ripple Clock Output)

Functional Features

• Synchronous operation: The counter advances on each clock pulse.
• Up/Down control: The direction of counting can be controlled using the UP/DOWN input.
• Preset capability: Allows the counter to start at a predetermined value using the PRESET input.
• Enable control: The counter can be enabled or disabled using the ENABLE input.
• Carry output: Provides a carry signal when the counter reaches its maximum count value.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient counting in time-critical applications. - Versatile functionality with up/down control, preset capability, and enable control. - Compact DIP-16 package enables easy integration into various circuit designs.

Disadvantages: - Limited counting range of 0 to 15 (4-bit binary). - Requires an external clock source for proper operation.

Working Principles

The SN74LS191DE4 is a synchronous counter that operates based on the clock input. On each rising edge of the clock signal, the counter advances by one count in the direction determined by the UP/DOWN input. The counter can be preset to a specific value using the PRESET input. The ENABLE input allows for enabling or disabling the counter. The carry output provides a signal when the counter reaches its maximum count value.

Detailed Application Field Plans

The SN74LS191DE4 finds applications in various digital systems, including:

1. Frequency dividers: Used to divide the frequency of an input signal by a specific factor.
2. Event counters: Used to count the occurrence of specific events in digital systems.
3. Digital clocks: Used as a component in digital clock circuits to keep track of time.
4. Industrial automation: Used in control systems for counting and timing operations.
5. Traffic light controllers: Used to sequence the traffic lights in an intersection.

Detailed and Complete Alternative Models

1. CD40193BE: Similar 4-bit synchronous up/down counter IC from Texas Instruments.
2. MC14516B: 4-bit synchronous up/down counter IC from ON Semiconductor.
3. 74HC191: High-speed CMOS logic 4-bit synchronous up/down counter IC from NXP Semiconductors.

These alternative models offer similar functionality and can be used as replacements for the SN74LS191DE4 in various applications.

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