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- CHOOSING A POWER SUPPLY FOR THE AT
-
- The power-good signal is a TTL-compatible high level for normal
- operation or a low level for fault conditions. If the power-good signal
- works well, then the system will function properly. Otherwise the data
- setting in CMOS RAM will be lost. The following list gives you some
- guidelines for choosing the right power supply:
-
- * The power-good signal should have a turn-on delay of at least 200ms,
- but not longer than 500ms when the power is on (This means that the
- power-good signal goes to a high level later than +5V).
-
- * The power-good signal goes to a low level at least 100ms before +5V
- falls below the regulation limits when the power is off.
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