8-Line To 3-Line Priority Encoders The SN74HC148 is a priority encoder manufactured by Texas Instruments. Here are its specifications, descriptions, and features based on Ic-phoenix technical data files:
### **Specifications:**
- **Logic Type:** Priority Encoder
- **Technology:** HC (High-Speed CMOS)
- **Supply Voltage Range:** 2V to 6V
- **Operating Temperature Range:** -40°C to +85°C
- **Number of Inputs:** 8 (active-low)
- **Number of Outputs:** 3 (binary coded, active-low)
- **Propagation Delay:** Typically 13 ns at 5V
- **Current Consumption:** Low power consumption (CMOS technology)
- **Package Options:** PDIP, SOIC, TSSOP
### **Description:**
The SN74HC148 is an 8-line to 3-line priority encoder that converts active-low inputs (0 to 7) into a 3-bit binary code (active-low outputs A0, A1, A2). It features priority encoding, where the highest-order input takes precedence. It also includes an enable input (EI, active-low) and an enable output (EO, active-low) for cascading multiple encoders.
### **Features:**
- **Priority Encoding:** Highest-order input (I7) has the highest priority.
- **Active-Low Inputs/Outputs:** All inputs and binary outputs are active-low.
- **Cascadable:** Includes enable input (EI) and enable output (EO) for expansion.
- **Wide Operating Voltage:** Supports 2V to 6V, making it compatible with various logic levels.
- **High Noise Immunity:** CMOS technology ensures reliable performance.
- **Low Power Consumption:** Suitable for battery-operated applications.
- **Fast Switching Speed:** Propagation delay of 13 ns (typical at 5V).
This information is strictly factual and derived from Texas Instruments' documentation.
