MAX700 データシートの表示（PDF） - Maxim Integrated

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MAX700

Power-Supply Monitor with Reset

Maxim Integrated 

MAX700/MAX701/MAX702

Power-Supply Monitor with Reset

Pin Description

PIN

MAX700 MAX701 MAX702

1

1

1

2

—

—

NAME

FUNCTION

MR

Input for Manual Pushbutton Reset. Has internal 5µA pullup. Low input activates the

RESET/RESET outputs.

The voltage-sense input when CTL = VCC. Its threshold is 1.29V. SENSE always

SENSE remains connected to the internal comparator. So, when VCC is being monitored

internally (CTL = GND), SENSE should be left open circuit.

Normally NOT used when voltage is monitored through VCC (CTL = GND). When

3

—

—

HYST

monitoring through SENSE (CTL = VCC), HYST allows hysteresis to be added,

reducing noise and spurious reset activity (Figure 3). HYST turns on 5µs before the

RESET/RESET outputs are activated, and its on-resistance to GND is typically 1kΩ.

4

4

3

GND Ground

5

6

7

RESET

Goes low when VCC falls below 4.65V, or when CTL = VCC on the MAX700 goes low

when SENSE falls below 1.29V.

6

5

—

RESET Inverted Version of RESET

When CTL = GND, VCC is monitored by the reset circuit. When CTL = VCC, VCC

7

—

—

CTL is ignored and SENSE is monitored, allowing the threshold to be set with external

resistors.

8

8

2

VCC Chip Power and +5V Sensing Input (When CTL = GND on MAX700)

—

2, 3, 7 4, 5, 6, 8 N.C. No Connection

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