SN74AVCBH164245: What is difference between SN74AVCB164245GR and SN74AVCBH164245GR?

Carl Wolfe

Part Number: SN74AVCBH164245

What does the "H" stand for? It appears the difference between these parts is the H version has Active bus-hold circuitry that is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

is this correct? any other differences? These two devices cannot therefore be considered as P2P alternatives, without unpopulation pull up resistors, correct?

Regards,

Carl Wolfe

over 2 years ago

0 Carl Wolfe over 2 years ago

TI__Genius 10645 points

customer also provided schematic clip of application.

is H version an alternative for this design.docx

0 Jack Guan over 2 years ago

TI__Mastermind 27901 points

Hey Carl,

Performance wise- these two devices are identical. The only difference between the AVCB164245GR and the AVCBH164245GR is that the "H" version includes additional circuitry on the input that eliminates the need for external pullup/pulldown resistors (meaning any unused inputs can be left floating).

In the schematic you have attached, it is acceptable to leave B7 and B9 left floating if the customer plans to use the AVCBH164245GR. It is also acceptable to connect the bus-hold input directly to ground. Here is an in-depth app note on bus hold circuitry.

Thanks,

Jack

0 Carl Wolfe over 2 years ago in reply to Jack Guan

TI__Genius 10645 points

Jack,

Thanks for prompt reply, information and application note.

Regards,

Carl

Logic

Logic forum

SN74AVCBH164245: What is difference between SN74AVCB164245GR and SN74AVCBH164245GR?