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The output voltage from a buffer type does not reach the supply voltage. What can I do to prevent this?

The major causes why the output voltage from a buffer does not reach the supply voltage include the following:
 

  1. A buffer type might be connected to a device exceeding its drive capability.
    Check the output current (driving capability) of the buffer type and the driven device.
    If the buffer type’s drive capability is insufficient, consider using a buffer type with higher output current. The application notes for each logic IC series show typical examples of output current.
    The application notes
  2. The input signal frequency might exceed the maximum operating frequency of a buffer type.
    Check if the input signal frequency exceeds the maximum operating frequency of the buffer type. If so, consider using a faster buffer type. Logic ICs with relatively high operating speed include the 5-V VHC series (58 MHz in the case of the 74VHC244), 3-V VCX series (142 MHz in the case of the 74VCX244), and 3-V LCX series (76 MHz in the case of the 74LCX244). For the concept of the maximum operating frequency, please refer to “The datasheets for some logic ICs do not show the maximum operating frequency. What is their maximum operating frequency?” in the Frequently Asked Questions (FAQ) page.

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