4

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Microprocessor and Nonvolatile

Memory Supervisory Circuits

Note 1: The minimum operating voltage is 2.75V; however, the MAX792R and MAX820R are guaranteed to operate down to their

preset reset thresholds.

Note 2: Pulling RESET IN/INT below 60mV selects internal threshold mode and connects the internal voltage divider to the reset

and low-line comparators. External programming mode allows an external resistor divider to set the low-line and reset

thresholds (see Figure 4).

Note 3: The Chip-Enable Propagation delay is measured from the 50% point at CE IN to the 50% point at CE OUT.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

MR Pull-Up Current

MR = 0V

0.8

1

CE IN Threshold Voltage

0.2

V

CE IN Leakage Current

50

Ω source impedance driver,

Disabled mode

±0.005

±1

µA

75

150

610

CE IN to CE OUT Resistance

OVI Input Threshold

Enabled mode

150

300

1.25

1.30

1.35

V

OVI Leakage Current

Ω

±0.01

±25

nA

0.5

2.5

CE OUT Short-Circuit Current

0.4

OVO Output Voltage

0.05

0.2

0.4

V

mA

Chip-Enable Propagation Delay

(Note 3)

10

50

813

ns

Chip-Enable Output Voltage

High (Reset Active)

V

Reset Active to CE OUT High

15

µs

MR Minimum Pulse Width

25

µs

MR to RESET Propagation Delay

12

µs

MR Threshold Range

1.1

1.3

1.5

V

523

80

µA

OVO Short-Circuit Current

µA

13

OVI to OVO Delay

55

µs

ELECTRICAL CHARACTERISTICS (continued)

MANUAL RESET

CHIP-ENABLE GATING

OVERVOLTAGE COMPARATOR