Overview
The SN74HC148DWRG4 is an 8-line to 3-line priority encoder produced by Texas Instruments. This device is part of the 74HC series, known for its high-speed and low-power CMOS logic. The SN74HC148 is designed to encode eight data lines into a 3-line binary (octal) output, making it useful in various digital encoding and decoding applications. It features input enable (EI) and output enable (EO) signals, which facilitate cascading multiple stages without the need for external circuitry.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage (VCC = 2V) | 1.5 | - | - | V |
| VIH High-Level Input Voltage (VCC = 4.5V) | 3.15 | - | - | V |
| VIH High-Level Input Voltage (VCC = 6V) | 4.2 | - | - | V |
| VIL Low-Level Input Voltage (VCC = 2V) | 0.5 | - | - | V |
| VIL Low-Level Input Voltage (VCC = 4.5V) | 1.35 | - | - | V |
| VIL Low-Level Input Voltage (VCC = 6V) | 1.8 | - | - | V |
| IOH Output Current (VCC = 4.5V, IOH = -4mA) | - | 3.98 | 4.3 | mA |
| IOL Output Current (VCC = 4.5V, IOL = 4mA) | - | 0.17 | 0.26 | mA |
| ICC Supply Current (VCC = 6V, IO = 0) | - | 80 | - | μA |
| tpd Propagation Delay (VCC = 5V) | 23 | - | 36 | ns |
| TJ Junction Temperature | - | - | 150 | °C |
Key Features
- Wide operating voltage range of 2V to 6V
- Outputs can drive up to 10 LSTTL loads
- Low power consumption, with a maximum ICC of 80 μA
- Typical propagation delay of 16 ns
- ±4-mA output drive at 5V
- Low input current of 1 μA max
- Encode eight data lines to 3-line binary (octal)
- Input enable (EI) and output enable (EO) signals for cascading
Applications
- N-Bit encoding
- Code converters and generators
- Priority encoding in digital systems
- Data compression and encoding schemes
- Automated control systems requiring priority logic
Q & A
- What is the primary function of the SN74HC148DWRG4? The primary function is to encode eight data lines into a 3-line binary (octal) output.
- What is the operating voltage range of the SN74HC148DWRG4? The operating voltage range is from 2V to 6V.
- How many LSTTL loads can the outputs of the SN74HC148DWRG4 drive? The outputs can drive up to 10 LSTTL loads.
- What is the maximum supply current (ICC) of the SN74HC148DWRG4? The maximum supply current is 80 μA.
- What is the typical propagation delay of the SN74HC148DWRG4? The typical propagation delay is 16 ns.
- Does the SN74HC148DWRG4 support cascading? Yes, it supports cascading through input enable (EI) and output enable (EO) signals.
- What are some common applications of the SN74HC148DWRG4? Common applications include N-Bit encoding, code converters, and generators, as well as priority encoding in digital systems.
- What is the maximum junction temperature for the SN74HC148DWRG4? The maximum junction temperature is 150°C.
- How many input lines does the SN74HC148DWRG4 have? It has eight input lines.
- What is the output format of the encoded data? The output is in 3-line binary (octal) format.
