Is 3.3V pullup required in CB3T family of devices (sn74cb3t16211 - 24 bit). we are using this device with VCC of 3.3V to translate 5V swing signals to 3.3v swing signals on a CPCI interface. In fact, the input signals to sn74cb3t16211 could be either of 5V or 3.3v swing. Signals would be of maximum 33 MHz.
The following is from the datasheet of sn74cb3t16211:
" The I/O port of this device has a pullup current source that maintains the output voltage at VCC when the device is ON, and the input is greater than or equal to VCC – 1. Because of the pullup current source, the output voltage level may be less than VCC when the operating frequency is low and the I/O port is connected to a pulldown resistor. In order to maintain the output voltage at VCC, a pullup resistor must be connected to VCC instead of a pulldown resistor to ground. "
Thank you.
