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CD4043B: Output logic when start-up

Kuramochi Tadahiko

Guru 28715 points

Part Number: CD4043B

Hi,

If "S" and "R" keeps Low from start-up, does "Q" output High or Low?

Best regards,

Kuramochi

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 265490 points

Yes. See [FAQ] What is the default output of a latched device? (Flip-Flop, latch, register)

0 Kuramochi Tadahiko over 4 years ago in reply to Clemens Ladisch

Guru 28715 points

Above answer was incorrect.

According to the article, output is unstable when startup.

0 Clemens Ladisch over 4 years ago in reply to Kuramochi Tadahiko

Guru 265490 points

The output begins being unstable, but will immediately latch into either the high or low state.