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SN74LXC8T245-Q1: VCC isolation feature

Yuta Kurimoto
Expert 8260 points
Part Number: SN74LXC8T245-Q1
Other Parts Discussed in Thread: SN74AXC4T245-Q1, TXU0104, TXU0204

Hello Team,

I have some question about VCC isolation feature of SN74LXC8T245-Q1

Q. In customer usecase, A1=input, Vcca=1.8V, B1=Output, Vccb=3.3V.

If they disable(or float) the Vcca, the A1 side internal week pulldown will be activated for short period and then enter Hi-Z state. So the A1 node become Low. Is my understanding correct?

Q. Are the other device also have same function such internal week pulldown activation prior entering Hi-Z state?

Other device : 2N7001TQDCKRQ1(1bit), SN74LVC8T245QPWRQ1(8bit), SN74AXC4T245-Q1(4bit)

Thanks,

Yuta Kurimoto