TC1278 データシートの表示（PDF） - Microchip Technology

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TC1278

3-Pin Reset Monitors for 5V Systems

Microchip Technology 

3.2 VCC Transient Rejection

The TC1278/TC1279 provides accurate VCC monitor-

ing and reset timing during power-up, power-down,

and brownout/sag conditions, and rejects negative-

going transients (glitches) on the power supply line.

Figure 3-5 shows the maximum transient duration vs.

maximum negative excursion (overdrive) for glitch

rejection. Any combination of duration and overdrive

that lays under the curve will not generate a reset

signal. Combinations above the curve are detected as

a brownout or power-down. Transient immunity can be

improved by adding a capacitor in close proximity to the

VCC pin of the TC1278/TC1279.

TC1278/TC1279

FIGURE 3-5:

VCC

MAXIMUM TRANSIENT

DURATION VS.

OVERDRIVE FOR GLITCH

REJECTION AT 25°C

VCCTP

Overdrive

5

TA

4

Duration

°C

3

2

1

TC1278/9

0

1

5

100

1000

RESET COMPARATOR OVERDRIVE,

[VCCTP - VCC] (mV)

© 2002 Microchip Technology Inc.

DS21384B-page 5

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