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Tell me about the function of bus-hold.

The following figure shows a bus-hold circuit.

[Figure: bus-hold circuit]

 

Since the bus-hold circuit is a latch-based circuit, the CMOS input can be left open, eliminating the need for a pull-up or pull-down resistor. Additionally, it helps reduce current consumption, compared to the use of a pull resistor to tie the logic level to either 1 or 0, because the bus-hold circuit holds a logic level it has held immediately before assuming the high-impedance state.

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