SN74LS148N

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10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS

Below is the parameter table and instructions for the SN74LS148N Priority Encoder.

SN74LS148N Parameter Table

Instructions for SN74LS148N

1. Power Supply:

   • Connect V_CC to +5V and GND to 0V.
   • Ensure that the supply voltage remains within the specified range (4.75V to 5.25V).

2. Inputs:

   • The SN74LS148N has eight active-low inputs (I₀ to I₇).
   • Apply a low signal (0V) to the input you want to encode.
   • Unused inputs should be tied to V_CC (5V) to avoid floating conditions.

3. Outputs:

   • The encoder provides three active-low binary outputs (Y₀, Y₁, Y₂) representing the encoded value of the active input.
   • An additional output, GS (Group Strobe), goes low when any of the inputs are active.
   • The EO (Enable Out) output can be used to cascade multiple encoders.

4. Enable Inputs:

   • The encoder has two enable inputs: EI (Enable In) and EI^* (Enable In Complement).
   • To enable the encoder, set EI low and EI^* high.
   • If both EI and EI^* are not used, tie EI to GND and EI^* to V_CC.

5. Cascading:

   • To cascade multiple SN74LS148N encoders, connect the EO output of one encoder to the EI input of the next.
   • The cascaded encoders will encode inputs from a larger number of lines.

6. Propagation Delay:

   • The propagation delay time (t_pd) is the time it takes for the output to change after an input change.
   • Ensure that your system timing accounts for this delay.

7. Power Dissipation:

   • The maximum power dissipation is 100mW. Ensure that the device is not operated beyond this limit to avoid overheating.

8. Operating Temperature:

   • The device can operate over a wide temperature range (-55°C to 125°C). Ensure that the operating environment does not exceed these limits.

By following these instructions, you can effectively use the SN74LS148N Priority Encoder in your digital circuits.