AN2504 datasheet(6/14 Pages) STMICROELECTRONICS

Part #	AN2504

Description	Using STMicroelectronics Voltage Detectors

PDF	14 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Transient Immunity

AN2504 - Application note

6/14

Transient Immunity

The STM1061 device is relatively immune to negative-going VCC transients (glitches). The

graph (see Figure 4) indicates the maximum pulse width a negative VCC transient can have

without asserting output signal, OUT. As the magnitude of the transient increases (further

below the threshold), the maximum allowable pulse width decreases. Any combination of

duration and overdrive which lies under the curve will NOT assert the output signal, OUT.

A 0.1µF bypass capacitor, Cb, mounted as close as possible to the VCC pin provides

additional transient immunity (see Figure 5).

Figure 4.

Maximum Transient Duration vs. Reset Threshold Overdrive

Figure 5.

Additional Transient Immunity

Threshold Overdrive (mV)

AI11123b

100

120

140

160

100

1000

10000

VTH– = 3.4V

VTH– = 1.6V

AI12905a

VCC

STM1061N

OUT

VSS

Power Good

AN2504 Datasheet(PDF) 6 Page - STMicroelectronics