SN74AS161DR

Product Overview

• Category: Integrated Circuit
• Use: Counter
• Characteristics: High-speed, synchronous, 4-bit binary counter
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: A digital counter that can count up or down in binary format
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

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

Detailed Pin Configuration

The SN74AS161DR has a total of 16 pins, which are assigned as follows:

1. CLK (Clock Input)
2. MR (Master Reset Input)
3. CPD (Count Enable Parallel Input)
4. P0 (Parallel Data Input Bit 0)
5. P1 (Parallel Data Input Bit 1)
6. P2 (Parallel Data Input Bit 2)
7. P3 (Parallel Data Input Bit 3)
8. Q0 (Serial Output Bit 0)
9. Q1 (Serial Output Bit 1)
10. Q2 (Serial Output Bit 2)
11. Q3 (Serial Output Bit 3)
12. GND (Ground)
13. VCC (Supply Voltage)
14. CE (Count Enable Input)
15. PE (Parallel Enable Input)
16. TC (Terminal Count Output)

Functional Features

• Synchronous operation with a common clock input
• Can count up or down based on the control inputs
• Parallel load capability for presetting the counter value
• Terminal count output indicates when the counter reaches its maximum value
• Master reset input allows resetting the counter to zero

Advantages and Disadvantages

Advantages: - High-speed operation - Synchronous design ensures accurate counting - Parallel load capability allows easy initialization - Terminal count output simplifies external circuitry

Disadvantages: - Limited to 4-bit counting, may not be suitable for applications requiring larger counters - Requires an external clock signal for operation

Working Principles

The SN74AS161DR is a synchronous counter that operates based on the clock input. When the clock signal transitions from low to high, the counter increments or decrements based on the control inputs. The parallel load capability allows presetting the counter value by providing the desired binary input through the P0-P3 pins. The terminal count output (TC) goes high when the counter reaches its maximum value.

Detailed Application Field Plans

The SN74AS161DR can be used in various applications, including:

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

Detailed and Complete Alternative Models

1. SN74LS161A: Similar 4-bit synchronous binary counter with different logic family (LS - Low Power Schottky)
2. CD40161B: 4-bit synchronous binary counter with asynchronous reset capability
3. MC14516B: 4-bit synchronous up/down binary counter with parallel load capability

These alternative models offer similar functionality but may have differences in specifications, package type, or other characteristics.

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