Overview
The 74HC148P-E, produced by Renesas Electronics America Inc., is an 8-to-3 line priority encoder. This component is part of the 74HC series, known for its high-speed CMOS logic. It is designed to encode 8 input lines into a 3-bit binary code, with priority logic that ensures the highest-priority input is encoded first. The device includes input enable (EI) and output enable (EO) signals, which provide additional control over the encoding process. This encoder is compliant with EU RoHS regulations and is widely used in various digital systems where priority encoding is necessary.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | - | 6 | V |
| High-Level Output Voltage (VOH) | 1.9 | - | 5.9 | V (IOH = -20 μA) |
| Low-Level Output Voltage (VOL) | 0.1 | - | 0.1 | V (IOL = 20 μA) |
| Propagation Delay Time (tpd) | 60 | - | 225 | ns (TA = 25°C, CL = 50pF) |
| Transition Time | 8 | - | 110 | ns (TA = 25°C, CL = 50pF) |
| Input Hold Current | ±0.1 | - | ±1000 | nA (VI = VCC or 0) |
| Supply Current (ICC) | 8 | - | 160 | μA (VI = VCC or 0, IO = 0) |
| Input Capacitance (Ci) | 3 | - | 10 | pF (VI = VIH or VIL) |
| Operating Temperature | -40 | - | 125 | °C |
| Storage Temperature | -65 | - | 150 | °C |
Key Features
- Priority Encoding: Encodes 8 input lines into a 3-bit binary code with priority logic.
- Input and Output Enables: Includes input enable (EI) and output enable (EO) signals for additional control.
- High-Speed CMOS Logic: Part of the 74HC series, known for its high-speed and low power consumption.
- Compliance with Industry Standards: Compliant with EU RoHS regulations.
- Wide Operating Voltage Range: Operates from 2V to 6V, making it versatile for various applications.
- Low Power Consumption: Low supply current (ICC) reduces power consumption.
Applications
- Digital Systems: Used in digital systems where priority encoding is necessary, such as in control systems and data processing units.
- Control Systems: Useful in control systems where multiple inputs need to be prioritized and encoded.
- Data Processing Units: Employed in data processing units to manage and prioritize data streams.
- Automotive and Industrial Automation: Can be used in automotive and industrial automation systems for encoding and prioritizing sensor inputs.
Q & A
- What is the primary function of the 74HC148P-E?
The primary function of the 74HC148P-E is to encode 8 input lines into a 3-bit binary code with priority logic.
- What are the input and output enable signals used for?
The input enable (EI) and output enable (EO) signals provide additional control over the encoding process, allowing for selective enabling or disabling of inputs and outputs.
- What is the operating voltage range of the 74HC148P-E?
The 74HC148P-E operates from 2V to 6V.
- Is the 74HC148P-E compliant with EU RoHS regulations?
- What is the typical propagation delay time of the 74HC148P-E?
The typical propagation delay time is around 60-225 ns, depending on the operating conditions.
- What are some common applications of the 74HC148P-E?
- How does the priority logic work in the 74HC148P-E?
The priority logic ensures that the highest-priority input is encoded first, even if multiple inputs are active simultaneously.
- What is the maximum storage temperature for the 74HC148P-E?
- What is the input capacitance of the 74HC148P-E?
- How much current does the 74HC148P-E typically consume?
