N74F521D,623

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Digital Logic
• Characteristics: High-speed, 8-bit counter with parallel load
• Package: Dual In-Line Package (DIP)
• Essence: Counter and Shift Register
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Output Current: ±6mA
• Propagation Delay: 10ns (typical)
• Counting Modes: Up, Down, Asynchronous Load

Detailed Pin Configuration

1. CP (Clock Pulse) - Clock input for counting
2. MR (Master Reset) - Active low reset input
3. PL (Parallel Load) - Active high parallel load input
4. QA-QH (Outputs) - Eight output pins representing the count value
5. GND (Ground) - Ground reference
6. QH' (Borrow Out) - Borrow output for cascading multiple counters
7. VCC (Supply Voltage) - Positive power supply input

Functional Features

• High-speed operation allows for efficient counting in various applications.
• Parallel load capability enables loading of a preset count value.
• Asynchronous master reset allows immediate reset of the counter.
• Cascading feature facilitates the expansion of the counter width.

Advantages

• Fast counting speed ensures real-time performance in time-critical applications.
• Parallel load functionality provides flexibility in setting initial count values.
• Asynchronous reset allows quick and reliable counter reset.
• Cascading capability enables the creation of wider counters.

Disadvantages

• Limited output current may restrict direct driving of certain loads.
• Requires external clock signal for counting operation.
• Limited temperature range may not be suitable for extreme environments.

Working Principles

The N74F521D,623 is an 8-bit counter with parallel load functionality. It counts up or down based on the clock input and can be loaded with a preset count value using the parallel load input. The counter can be reset asynchronously using the master reset input. The outputs represent the current count value in binary format. Cascading multiple counters allows for the creation of wider counters.

Detailed Application Field Plans

1. Digital frequency dividers
2. Event counters
3. Industrial automation systems
4. Data communication equipment
5. Automotive electronics

Detailed and Complete Alternative Models

1. SN74LS521 - Similar 8-bit counter with parallel load, different package (SOP)
2. CD54HC521 - High-speed CMOS version of the 8-bit counter with parallel load
3. MC14521B - Binary counter with similar functionality, different pin configuration

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