SN74ALS191ADG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter/Divider
• Characteristics: High-speed, synchronous, up/down counter
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Binary counter with synchronous parallel load and asynchronous reset
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Maximum Clock Frequency: 25 MHz
• Number of Bits: 4
• Logic Family: ALS (Advanced Low-Power Schottky)

Detailed Pin Configuration

The SN74ALS191ADG4 has a total of 16 pins. The pin configuration is as follows:

1. CLK (Clock Input)
2. UP/DOWN (Up/Down Control Input)
3. PRESET (Parallel Load Enable Input)
4. ENABLE (Enable Input)
5. A (Data Input A)
6. B (Data Input B)
7. C (Data Input C)
8. D (Data Input D)
9. QA (Output Q Bit 0)
10. QB (Output Q Bit 1)
11. QC (Output Q Bit 2)
12. QD (Output Q Bit 3)
13. GND (Ground)
14. NC (No Connection)
15. VCC (Positive Power Supply)
16. NC (No Connection)

Functional Features

• Synchronous counting: The counter advances on each clock pulse.
• Up/Down control: The direction of counting can be controlled using the UP/DOWN input.
• Parallel load: The counter can be loaded with data in parallel using the PRESET input.
• Asynchronous reset: The counter can be reset asynchronously using the ENABLE input.

Advantages and Disadvantages

Advantages: - High-speed operation - Synchronous counting ensures accurate results - Flexible up/down control - Parallel load capability allows for easy initialization

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

Working Principles

The SN74ALS191ADG4 is a synchronous up/down counter that counts in binary from 0 to 15. The counter advances on each rising edge of the clock signal when the ENABLE input is high. The direction of counting is determined by the state of the UP/DOWN input. When the PRESET input is high, the counter is loaded with the data present at the A, B, C, and D inputs. The counter can be asynchronously reset to 0 by bringing the ENABLE input low.

Detailed Application Field Plans

The SN74ALS191ADG4 is commonly used in various applications that require counting or dividing functions. Some potential application fields include:

1. Digital frequency counters
2. Industrial automation systems
3. Communication equipment
4. Test and measurement instruments
5. Automotive electronics

Detailed and Complete Alternative Models

1. SN74ALS192: Similar to SN74ALS191ADG4 but with a carry output for cascading multiple counters.
2. SN74LS191: Non-synchronous version with slower speed but lower power consumption.
3. CD40192: CMOS version with similar functionality but different pin configuration.

These alternative models provide similar counting and dividing capabilities, but may have different specifications and pin configurations.

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