SN74AS161DE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter
• Characteristics: High-speed, synchronous, 4-bit binary counter
• Package: Dual-In-Line Package (DIP)
• Essence: Sequential logic device
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Logic Family: AS
• Number of Bits: 4
• Counting Sequence: Binary
• Clock Input: Synchronous
• Reset Input: Asynchronous
• Output Type: Standard

Detailed Pin Configuration

The SN74AS161DE4 has a total of 16 pins, which are assigned specific functions as follows:

1. VCC: Positive power supply (+5V)
2. GND: Ground (0V)
3. CP: Clock input for counting
4. MR: Master reset input (active low)
5. QA: Output bit 0
6. QB: Output bit 1
7. QC: Output bit 2
8. QD: Output bit 3
9. TC: Terminal count output (active high)
10. RC: Ripple carry output (active high)
11. CE: Count enable input (active low)
12. PE: Parallel enable input (active low)
13. P0: Parallel data input bit 0
14. P1: Parallel data input bit 1
15. P2: Parallel data input bit 2
16. P3: Parallel data input bit 3

Functional Features

• High-speed operation: The SN74AS161DE4 is designed to operate at high clock frequencies, making it suitable for applications requiring fast counting.
• Synchronous counting: The counter advances on each rising edge of the clock input, ensuring accurate and synchronized counting.
• Asynchronous reset: The master reset input allows for immediate resetting of the counter to its initial state.
• Terminal count output: The terminal count output goes high when the counter reaches its maximum value, providing a signal to indicate the completion of a counting cycle.
• Ripple carry output: The ripple carry output can be used to cascade multiple counters together for higher bit-count applications.

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient counting in time-critical applications. - Synchronous counting ensures accurate and synchronized results. - Asynchronous reset allows for immediate resetting of the counter. - Terminal count output provides a convenient way to detect the completion of a counting cycle. - Ripple carry output facilitates cascading of multiple counters.

Disadvantages: - Limited to 4-bit counting, which may not be sufficient for certain applications requiring larger bit counts. - Requires an external clock source for operation.

Working Principles

The SN74AS161DE4 is a synchronous 4-bit binary counter. It operates by incrementing its internal count on each rising edge of the clock input (CP). The counter can be reset to its initial state using the master reset input (MR), which is active low. The parallel enable input (PE) allows for loading of data in parallel, while the count enable input (CE) controls the counting operation.

The counter has four output pins (QA, QB, QC, QD) that represent the current count value in binary form. The terminal count output (TC) goes high when the counter reaches its maximum value, indicating the completion of a counting cycle. The ripple carry output (RC) can be used to cascade multiple counters together for applications requiring larger bit counts.

Detailed Application Field Plans

The SN74AS161DE4 can be used in various applications that require counting and sequencing. Some potential application fields include:

1. Digital frequency dividers: The counter can be used to divide an input clock signal by a specific factor, generating lower-frequency output signals.
2. Event counting: It can be employed to count the occurrence of events in systems such as industrial automation or traffic monitoring.
3. Address generation: The counter can be utilized to generate sequential addresses for memory access in microcontrollers or digital signal processors.
4. Timekeeping: It can be incorporated into timekeeping circuits to track elapsed time or generate precise timing signals.

Detailed and Complete Alternative Models

1. SN74AS163DE4: 4-bit synchronous binary counter with parallel load capability.
2. SN74AS163D: 4-bit synchronous binary counter with asynchronous reset and parallel load capability.
3. SN74LS161N: 4-bit synchronous binary counter with asynchronous reset and carry output.
4. CD40161BE: 4-bit synchronous binary counter with asynchronous reset and ripple carry output.

These alternative models offer similar functionality to the SN74AS161DE4 and can be considered based on specific requirements and availability.

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