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ZXCM209XF Datasheet(PDF) 5 Page - Zetex Semiconductors |
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ZXCM209XF Datasheet(HTML) 5 Page - Zetex Semiconductors |
5 / 8 page ISSUE 3 - FEBRUARY 2001 ZXCM209 ZXCM210 APPLICATIONS INFORMATION Negative going V CC transients The ZXCM209/210 are, to a good degree, immune to short duration negative going supply transients. Under certain circumstances very brief transients are allowed without inappropriate false triggering of the reset circuit. The response to supply transients is shown in the Noise Immunity graph in the typical characteristics. The graph indicates the typical allowable transient duration for a specified threshold overdrive such that a reset pulse is not generated. Addition of a bypass capacitor, e.g. 0.1µF, as close as possible to the V CC pin will provide extra transient immunity. Reset valid down to very low supply voltages With V CC between 0V and 1V the output of the ZXCM209/210 may be in an undefined state. In many systems this is inconsequential as the microprocessor, and other circuits, will be inoperative with supplies this low. In applications where this is important, the addition of an external resistor ensures that the reset output remains valid for V CC < 1V. The resistor value is non critical: a value of 100k Ω is recommended. For the ZXCM209 the resistor should be applied between reset output and ground: for the ZXCM210 between reset output and V CC. Figure 1 shows the connection diagram for the ZXCM devices in these configurations. v cc ZXCM210 Reset Output Gnd v cc Micro Reset Input Gnd v cc 100k v cc ZXCM209 Reset Output Gnd v cc Micro Reset Input Gnd v cc 100k Figure 1 Circuit for operation of ZXCM with reset valid down to very low supply voltage. 5 |
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