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Timing
If an external device driving the reset or edge sensitive input on a Digi processor
cannot meet the 500ns maximum rise and fall time requirement, the signal must be
buffered with a Schmitt trigger device. Here are sample Schmitt trigger device part
numbers:
Manufacturer Part number Description
Fairchild NC7SP17 Single Schmitt trigger buffer, available in 5-lead SC70 and
6-lead MicroPak packages
Philips 74LVC1G17GW Single Schmitt trigger buffer, available in 5-lead SC70 and
SOT 353 packages
TI SN74LVC1G17DCK Single Schmitt trigger buffer, available in 5-lead SC70 and
SOT 353 packages
ON Semi NL17SZ17DFT2 Single Schmitt trigger buffer, available in 5-lead SC70 and
SOT 353 packages.