Overview
The SN74HC148DWRE4 is an 8-line to 3-line priority encoder produced by Texas Instruments. This device is part of the 74HC series, known for its wide operating voltage range and low power consumption. It encodes eight data lines into a 3-line binary (octal) output, making it suitable for various digital encoding and decoding applications. The device features input and output enable signals, allowing for easy cascading of multiple stages without additional external circuitry.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage (VCC = 2V) | 1.5 | V | ||
| VIL Low-Level Input Voltage (VCC = 2V) | 0.5 | V | ||
| VOH High-Level Output Voltage (IOH = -20 μA, VCC = 5V) | 4.4 | V | ||
| VOL Low-Level Output Voltage (IOL = 20 μA, VCC = 5V) | 0.1 | V | ||
| ICC Supply Current (VI = VCC or GND, IO = 0) | 80 | 160 | μA | |
| tpd Propagation Delay (A0, A1, A2 to EO, VCC = 5V) | 23 | 54 | ns | |
| TJ Junction Temperature | 150 | °C | ||
| Tstg Storage Temperature | -65 | 150 | °C |
Key Features
- Wide operating voltage range of 2V to 6V
- Outputs can drive up to 10 LSTTL loads
- Low power consumption, 80-μA max ICC
- Typical propagation delay of 16ns
- ±4-mA output drive at 5V
- Low input current of 1μA max
- Encode eight data lines to 3-line binary (octal)
- Input and output enable signals for cascading multiple stages
Applications
- N-Bit encoding
- Code converters and generators
Q & A
- What is the primary function of the SN74HC148DWRE4? The primary function is to encode eight data lines into a 3-line binary (octal) output.
- What is the operating voltage range of the SN74HC148DWRE4? The operating voltage range is from 2V to 6V.
- How many LSTTL loads can the outputs of the SN74HC148DWRE4 drive? The outputs can drive up to 10 LSTTL loads.
- What is the typical propagation delay of the SN74HC148DWRE4? The typical propagation delay is 16ns.
- Does the SN74HC148DWRE4 support cascading of multiple stages? Yes, it supports cascading through input and output enable signals.
- What are the typical applications of the SN74HC148DWRE4? Typical applications include n-bit encoding and code converters and generators.
- What is the maximum junction temperature for the SN74HC148DWRE4? The maximum junction temperature is 150°C.
- What is the storage temperature range for the SN74HC148DWRE4? The storage temperature range is from -65°C to 150°C.
- How much current does the SN74HC148DWRE4 typically consume? The typical supply current is 80 μA.
- What package types are available for the SN74HC148DWRE4? Available packages include SOIC, PDIP, SO, CDIP, and LCCC.
