ADM812_15 datasheet(8/12 Pages) AD

Part #	ADM812

Description	Microprocessor Supervisory Circuit in 4-Lead SOT-143 with DSP

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ADM811/ADM812

Data Sheet

Rev. G | Page 8 of 12

INTERFACING TO OTHER DEVICES

OUTPUT

The ADM811/ADM812 are designed to integrate with as many

devices as possible. One feature of the ADM811/ADM812 is the

reset output, which is directly proportional to VCC (this is guar-

anteed only while VCC is greater than 1 V). This enables the part

to be used with both 3 V and 5 V, or any nominal voltage within

the minimum and maximum specifications for VCC.

BENEFITS OF A VERY ACCURATE RESET

THRESHOLD

Because the ADM811/ADM812 can operate effectively even

when there are large degradations of the supply voltages, the

possibility of a malfunction during a power failure is greatly

reduced. Another advantage of the ADM811/ADM812 is its

very accurate internal voltage reference circuit. Combined,

these benefits produce an exceptionally reliable microprocessor

supervisory circuit.

ADM811

GND

VCC

RESET

Figure 11. Ensuring a Valid RESET Output Down to VCC = 0 V

ENSURING A VALID RESET/RESET

OUTPUT DOWN TO VCC = 0 V

When VCC falls below 0.8 V, the RESET/RESET of the ADM811/

ADM812 no longer sinks current. Therefore, a high impedance

CMOS logic input connected to RESET/RESET can drift to

undetermined logic levels. To eliminate this problem, a 100 kΩ

resistor should be connected from RESET/RESET to ground.

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