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HD74LS161A from HIT

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HD74LS161A

Manufacturer: HIT

Synchronous 4-bit Binary Counter (direct clear)

Partnumber Manufacturer Quantity Availability
HD74LS161A HIT 57 In Stock

Description and Introduction

Synchronous 4-bit Binary Counter (direct clear) The HD74LS161A is a synchronous presettable binary counter manufactured by Hitachi (HIT). Here are its key specifications:

1. **Type**: 4-bit synchronous binary counter  
2. **Counting Mode**: Synchronous operation  
3. **Preset Capability**: Parallel load (asynchronous preset)  
4. **Clock Input**: Positive-edge triggered  
5. **Clear Function**: Asynchronous master reset  
6. **Outputs**: Four parallel outputs (Q0-Q3) with ripple carry output  
7. **Supply Voltage (VCC)**: 4.75V to 5.25V (nominal 5V)  
8. **Power Dissipation**: Typically 45mW  
9. **Propagation Delay**: 24ns (max) for clock to output  
10. **Operating Temperature Range**: 0°C to +70°C  
11. **Package**: 16-pin DIP (Dual In-line Package)  

The device is compatible with TTL logic levels and is part of the 74LS series. It is designed for high-speed counting applications.  

(Note: Always refer to the official datasheet for precise specifications.)

Partnumber Manufacturer Quantity Availability
HD74LS161A HITACHI 740 In Stock

Description and Introduction

Synchronous 4-bit Binary Counter (direct clear) The HD74LS161A is a synchronous presettable binary counter manufactured by Hitachi. Here are its key specifications:

- **Type**: Synchronous 4-bit binary counter
- **Operating Voltage**: 5V (TTL compatible)
- **Clock Frequency**: Up to 25 MHz (typical)
- **Counting Range**: 0 to 15 (4-bit binary)
- **Preset Capability**: Parallel load for preset values
- **Clear Function**: Asynchronous master reset
- **Outputs**: Standard TTL outputs (totem-pole)
- **Propagation Delay**: Typically 20 ns
- **Power Dissipation**: 45 mW (typical)
- **Package**: 16-pin DIP (Dual In-line Package)
- **Operating Temperature Range**: 0°C to 70°C (commercial grade)

This IC is commonly used in digital counting applications, frequency division, and timing circuits.

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