Overview
The 74HC157D is a high-speed CMOS 2-channel multiplexer fabricated with silicon gate C2MOS technology by Toshiba Semiconductor and Storage. This integrated circuit is part of the 74HC series, known for its high-speed operation and low power dissipation, similar to equivalent LSTTL (Low-power Schottky Transistor-Transistor Logic) devices. The 74HC157D is designed to operate over a wide temperature range and voltage range, making it versatile for various digital circuit applications.
Key Specifications
| Characteristic | Symbol | Rating/Value | Unit |
|---|---|---|---|
| Supply Voltage | VCC | 2.0 to 6.0 | V |
| Input Voltage | VIN | -0.5 to VCC + 0.5 | V |
| Output Voltage | VOUT | -0.5 to VCC + 0.5 | V |
| Propagation Delay Time (A, B - Y) | tPLH, tPHL | 10 ns (typ.) at VCC = 5 V | ns |
| Propagation Delay Time (SELECT - Y) | tPLH, tPHL | 13 ns (typ.) at VCC = 5 V | ns |
| Propagation Delay Time (ST - Y) | tPLH, tPHL | 10 ns (typ.) at VCC = 5 V | ns |
| Operating Temperature Range | Topr | -40 to 125 °C | °C |
| Power Dissipation | ICC | 4.0 µA (max) at Ta = 25 °C | µA |
| Package Type | SOIC16 |
Key Features
- High-Speed Operation: Achieves high-speed operation similar to equivalent LSTTL while maintaining CMOS low power dissipation, with a typical propagation delay time of 10 ns at VCC = 5 V.
- Wide Operating Temperature Range: Operates over a temperature range of -40 to 125 °C, making it suitable for various environmental conditions.
- Low Power Dissipation: Maximum current consumption of 4.0 µA at 25 °C.
- Balanced Propagation Delays: tPLH ≈ tPHL, ensuring consistent signal timing.
- Wide Operating Voltage Range: VCC can range from 2.0 to 6.0 V.
- Static and Transient Protection: All inputs are equipped with protection circuits against static discharge or transient excess voltage.
Applications
The 74HC157D is suitable for a variety of digital circuit applications, including:
- Data selection and routing in digital systems.
- High-speed multiplexing in communication and networking equipment.
- Low-power digital logic circuits in consumer electronics and industrial control systems.
- Automotive and aerospace applications requiring wide temperature range operation.
Q & A
- What is the 74HC157D?
The 74HC157D is a high-speed CMOS 2-channel multiplexer fabricated with silicon gate C2MOS technology.
- What is the typical propagation delay time of the 74HC157D?
The typical propagation delay time is 10 ns at VCC = 5 V.
- What is the operating temperature range of the 74HC157D?
The operating temperature range is -40 to 125 °C.
- What is the maximum power dissipation of the 74HC157D?
The maximum current consumption is 4.0 µA at 25 °C.
- What type of package does the 74HC157D come in?
The 74HC157D comes in a SOIC16 package.
- How does the SELECT decoding work in the 74HC157D?
The SELECT decoding determines whether the A or B inputs get transferred to their corresponding Y outputs.
- What happens when the STROBE is held high in the 74HC157D?
When the STROBE is held high, the selection of data is inhibited and all the outputs become low.
- Does the 74HC157D have protection against static discharge?
Yes, all inputs are equipped with protection circuits against static discharge or transient excess voltage.
- What is the voltage range for the supply voltage (VCC) of the 74HC157D?
The supply voltage (VCC) can range from 2.0 to 6.0 V.
- Are there any specific conditions to avoid for the 74HC157D to prevent damage?
Yes, exceeding the absolute maximum ratings, even briefly, can lead to deterioration in IC performance or destruction. Continuous operation under heavy loads should also be avoided.
