I have inherited a design that uses a TXB0108. One of the data lines on the VCCA side of the device is intended to drive a signal in a push-pull fashion which has a 1K pullup on it to VCCA. The other side of the device is receiving a push-pull signal referenced to VCCB.
I have determined that the 1K pull-up is causing a major problem when the device detects a falling edge on the VCCB side. I see a 40 ns ugly square-wave when the signal (RS-232 serial) on the VCCB side goes low.
I can't remove the pullup on the VCCA side because it is on a different subassembly.
The TXS0108E, a pin-compatible package, seems to look promising in solving this problem. Do you agree?
