Overview
The 74HC148FPEL-E is an 8-line to 3-line priority encoder integrated circuit produced by Renesas Electronics America Inc. This device is part of the 74HC series, known for its high-speed CMOS logic family. The 74HC148 is designed to encode eight input lines into a three-bit binary number, with additional features such as input and output enable signals.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 6 | V | ||
| High-level Output Voltage (VOH) | IOH = -20 μA, VCC = 4.5V | 3.98 | 4.3 | 4.5 | V |
| Low-level Output Voltage (VOL) | IOL = 20 μA, VCC = 4.5V | 0.17 | 0.26 | 0.4 | V |
| Propagation Delay (tpd) | A0, A1, A2 to GS, EO, VCC = 4.5V, TA = 25°C | 23 | 36 | 54 | ns |
| Transition Time (tt) | Any, VCC = 4.5V, TA = 25°C | 8 | 15 | 22 | ns |
| Input Hold Current (II) | VI = VCC or 0, VCC = 6V | ±0.1 | ±1000 | nA | |
| Supply Current (ICC) | VI = VCC or 0, IO = 0, VCC = 6V | 8 | 160 | μA | |
| Input Capacitance (Ci) | VI = VIH or VIL, VCC = 6V | 3 | 10 | pF |
Key Features
- Priority Encoding: The 74HC148 encodes eight input lines into a three-bit binary number, with priority given to the higher-order inputs.
- Input and Output Enable: Features input enable (EI) and output enable (EO) signals for controlling the device's operation.
- High-Speed CMOS Logic: Part of the 74HC series, known for its high-speed CMOS logic family, providing fast switching times and low power consumption.
- Wide Operating Voltage Range: Operates over a supply voltage range of 2V to 6V.
- Low Power Consumption: Low supply current, making it suitable for battery-powered devices.
Applications
- Priority Encoding in Digital Systems: Used in various digital systems where priority encoding is necessary, such as in data processing and control systems.
- Industrial Control Systems: Suitable for use in industrial control systems where reliable and fast encoding is required.
- Automotive Electronics: Can be used in automotive electronics for encoding sensor data and other control signals.
- Consumer Electronics: Used in consumer electronics such as TVs, set-top boxes, and other digital devices.
Q & A
- What is the primary function of the 74HC148FPEL-E?
The primary function of the 74HC148FPEL-E is to encode eight input lines into a three-bit binary number with priority given to the higher-order inputs.
- What are the input and output enable signals used for in the 74HC148FPEL-E?
The input enable (EI) and output enable (EO) signals are used to control the device's operation, allowing for selective enabling or disabling of the encoder.
- What is the operating voltage range of the 74HC148FPEL-E?
The 74HC148FPEL-E operates over a supply voltage range of 2V to 6V.
- What are the typical propagation delay and transition times for the 74HC148FPEL-E?
The typical propagation delay is around 36 ns, and the typical transition time is around 15 ns at VCC = 4.5V and TA = 25°C.
- How much current does the 74HC148FPEL-E typically consume?
The supply current (ICC) is typically around 8 μA to 160 μA depending on the operating conditions.
- What is the input capacitance of the 74HC148FPEL-E?
The input capacitance (Ci) is typically around 3 pF to 10 pF.
- What are some common applications of the 74HC148FPEL-E?
Common applications include priority encoding in digital systems, industrial control systems, automotive electronics, and consumer electronics.
- Is the 74HC148FPEL-E suitable for use in safety-critical applications?
No, it is not recommended for use in safety-critical applications without proper evaluation and validation.
- What is the package type of the 74HC148FPEL-E?
The 74HC148FPEL-E is available in a SOP16 (Small Outline Package, 16 pins) package.
- Where can I find detailed technical specifications for the 74HC148FPEL-E?
Detailed technical specifications can be found in the datasheet available from the manufacturer's website or through distributors like Digi-Key.
