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5V/3V Current at I/O pin Question

Hi All.

What happens in terms of current consumption / flow if one were to, say, drive a CMOS latch that's powered at 5V from an MSP430 output with the MSP430 operating at 3V?

Obviously the latch will correctly see logic 0 (0V) and logic 1 (3V, >

5V/2). But what about current consumption?

Will there be a non-negligible current flowing when the MSP430 outputs a 3V "into" the latch operating at 5V?

Or is it no different from having both the latch and the MSP430 running at 3V, so current is non-zero only during switching?

Thanks,

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Andrew E. Kalman, Ph.D.

Salvo(TM), the RTOS that runs in tiny places(TM)
http://www.pumpkininc.com
aek ... at ... pumpkininc ... dot ... com
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Andrew E. Kalman
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