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Tell me about the power-up sequence for dual-supply level shifters.

As an example, the following uses a bidirectional dual-supply level-shifting bus buffer. Unidirectional dual-supply level-shifting bus buffers require the same power-up sequence as for bidirectional dual-supply level-shifting bus buffers.
Start the control circuit first, followed by the other circuitry. Then, apply the control signals to place internal logic in a steady state and then apply other signals.

Apply power supply and other signals in the following order:

#1. VCCA
#2. VCCB (VCCA and VCCB may be powered up simultaneously.)
#3. Control signals (/OE, DIR)
#4. Input signals (A1 or B1)

Dual-supply level-shifting bus buffer
Dual-supply level-shifting bus buffer
Dual-supply level-shifting bus switch
Dual-supply level-shifting bus switch

The same sequence also applies to level-shifting bus switches.

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