MIC2774 datasheet(9/18 Pages) MICROCHIP

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2022 Microchip Technology Inc.

DS20006527A-page 9

MIC2774

4.6

Ensuring Proper Operation at Low

Supply

At VDD levels below 1.2V, the MIC2774’s reset output

cannot turn on sufficiently to produce a valid logic-low

on /RST. In this situation, circuits driven by /RST could

be allowed to float, causing undesired operation. In

most cases, however, it is expected that the circuits

driven by the MIC2774L will be similarly inoperative at

VDD ≤ 1.2V.

If a given application requires that /RST be valid below

VDD = 1.2V, this can be accomplished by adding a

pull-down resistor to the /RST output. A value of

100 kΩ is recommended because this is usually an

acceptable compromise of quiescent current and

pull-down current. The resistor’s value is not critical,

however. See Figure 4-5.

These statements also apply to the MIC2774H’s RST

output. That is, to ensure valid RST signal levels at VDD

< 1.2V, a pull-up resistor (as opposed to a pull-down)

should be added to the RST output. A value of 100 kΩ

is typical for this application, as well. See Figure 4-6.

FIGURE 4-5:

MIC2774L Valid /RST Below

1.2V.

FIGURE 4-6:

MIC2774H Valid RST Below

1.2V.

/RST

VDD

/MR

GND

MIC2774L-XX

/RESET

VCC

GND

MANUAL

RESET

MICROPROCESSOR

R PULL-DOWN

RST

VDD

/MR

GND

MIC2774H-XX

RESET

VCC

GND

MANUAL

RESET

MICROPROCESSOR

R PULL-UP

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