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Product Detailed Parameters
- Description：IC PRIORITY ENCOD 1 X 8:3 16SOIC
- Series：74HC
- Mfr：Texas Instruments
- Package：Tube
- Type：Priority Encoder
- Circuit：1 x 8:3
- Independent Circuits：1
- Current - Output High, Low：5.2mA, 5.2mA
- Voltage Supply Source：Single Supply
- Voltage - Supply：2V ~ 6V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：16-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：16-SOIC
- Grade：-
- Qualification：-
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Overview
The SN74HC148DE4 is an 8-line to 3-line priority encoder manufactured by Texas Instruments. It belongs to the HC logic family and operates on a single power supply ranging from 2V to 6V. The device encodes eight active-low data inputs into a 3-bit binary code, also active-low. It features dedicated enable input (EI) and enable output (EO) pins that facilitate cascading multiple units for expanded encoding without external logic. The component is housed in a 16-pin SOIC package.
Feature Summary
- Encodes eight active-low data lines into three active-low binary outputs
- Includes enable input and enable output signals for direct cascading
- Operates within a wide voltage range of 2V to 6V
- Outputs are capable of driving up to 10 LSTTL loads
Applications
- N-Bit encoding systems
- Code converters
- Code generators
Procurement Notes
Verify the specific ordering suffix 'E4' against the manufacturer's current orderable addendum to confirm material composition and lead finish specifications. Ensure the selected package variant matches the required PCB footprint dimensions. Confirm RoHS compliance status and moisture sensitivity level ratings prior to assembly planning.
Selection Notes
Select this component when designing circuits requiring octal priority encoding with minimal external gate requirements. The integrated EI and EO pins simplify multi-stage expansion designs. Verify that the operating voltage falls within the 2V to 6V range and that the load requirements do not exceed the specified drive capabilities.
Part Context
This part is a member of the SNx4HC148 series, which includes variants such as SN54HC148 and SN74HC148. These devices share identical functional characteristics but may differ in temperature ranges or packaging options. The SN74HC148DE4 specifically denotes the commercial grade version in a 16-pin SOIC package.
Replacement Considerations
SN74HC148DR
FAQ
How does the device handle multiple simultaneous active inputs?
The device performs priority decoding, ensuring that only the highest-order active data line is encoded into the binary output.
What is the function of the GS pin?
The GS (Group Signal) pin indicates whether any of the data inputs are active. It goes low when at least one input is asserted.
