74LS147N

BUY 74LS147N https://www.utsource.net/itm/p/1551900.html

Below is the parameter table and instructions for the 74LS147N Priority Encoder.

74LS147N Parameter Table

Instructions for Using the 74LS147N

1. Power Supply:

   • Connect the V_CC pin to a 5V supply.
   • Connect the GND pin to ground.

2. Input Connections:

   • The 74LS147N has 10 input pins (I0 to I9). These inputs are active low, meaning a low signal (0V) on any input will trigger the encoder.
   • If an input is not used, it should be tied to V_CC (5V) to avoid floating states.

3. Output Connections:

   • The 74LS147N has 4 output pins (Q0 to Q3) that provide a binary code corresponding to the highest active low input.
   • The outputs are active low, so a low signal indicates a logic 1 in the binary code.

4. Enable Pin:

   • The 74LS147N has an enable pin (EN). When EN is high (5V), the encoder is disabled, and all outputs are high (logic 0).
   • When EN is low (0V), the encoder is enabled, and it will encode the highest active low input.

5. Propagation Delay:

   • The propagation delay time (t_pd) is the time it takes for the output to change after an input changes. It typically ranges from 22 to 45 nanoseconds.

6. Operating Conditions:

   • Ensure that the operating temperature range (0°C to 70°C) is maintained to avoid damage to the device.
   • Store the device within the storage temperature range (-65°C to 150°C) when not in use.

7. Example Application:

   • To encode a decimal number (0-9) into a 4-bit binary code:
     • Connect the decimal inputs (I0 to I9) to the corresponding switches or sensors.
     • Connect the enable pin (EN) to ground to enable the encoder.
     • The binary output (Q0 to Q3) will represent the highest active low input in binary form.

By following these instructions, you can effectively use the 74LS147N Priority Encoder in your digital circuits.