SCES861G June 2015 – December 2024 TXS0108E-Q1
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
TI recommends careful PCB layout practices with short PCB trace lengths to avoid excessive capacitive loading and so that proper one-shot triggering takes place. PCB signal trace-lengths should be kept short enough such that the round trip delay of any reflection is less than the one-shot duration. This improves signal integrity by allowing any reflection to see a low impedance at the driver. The one-shot circuits have been designed to stay on for approximately 30ns. The maximum capacitance of the lumped load that can be driven also depends directly on the one-shot duration. With very heavy capacitive loads, the one-shot can time-out before the signal is driven fully to the positive rail. The one-shot duration has been set to best optimize trade-offs between dynamic ICC, load driving capability, and maximum bit-rate considerations. Both PCB trace length and connectors add to the capacitance of the TXS0108E-Q1 output. Therefore, TI recommends that this lumped-load capacitance is considered to avoid one-shot retriggering, bus contention, output signal oscillations, or other adverse system-level affects.