MAX791CSLASHD datasheet(4/20 Pages) MAXIM

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Microprocessor Supervisory Circuit

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 4.75V to 5.5V, VBATT = 2.8V, TA = TMIN to TMAX, unless otherwise noted.)

Note 1: Either VCC or VBATT can go to 0V, if the other is greater than 2.0V.

Note 2: The supply current drawn by the MAX791 from the battery (excluding IOUT) typically goes to 10µA when

(VBATT - 1V) < VCC < VBATT. In most applications, this is a brief period as VCC falls through this region.

Note 3: "+" = battery-discharging current, "-" = battery-charging current.

Note 4: WDI is internally connected to a voltage divider between VOUT and GND. If unconnected, WDI is driven to 1.6V (typ),

disabling the watchdog function.

Note 5: The chip-enable resistance is tested with VCC = 4.75V V

–

—

–

IN = V C

—

–

OUT = VCC / 2.

Note 6: The chip-enable propagation delay is measured from the 50% point at

–

—

–

IN to the 50% point at

–

—

–

OUT.

610

Ω source impedance driver, CLOAD = 50pF

–

—

–

IN-to-C

—

–

OUT Propagation

Delay (Note 6)

-50

-10

WDI = 0V

µA

WDI = VOUT

WDI Input Current

0.75 x VCC

VIH

µA

250

–

—

–

= 0V

–

—

–

Pull-Up Current

µs

Ω

150

Enabled mode

–

—

–

-to -

–

—

–

Propagation Delay

–

—

–

IN-to-

–

—

–

OUT Resistance

(Note 5)

µA

±0.005

±1

Disabled mode

–

—

–

IN Leakage Current

µs

Power down

–

—

–

-to-

–

—

–

OUT Delay

±0.01

±25

PFI Leakage Current

1.25

VCC = 5V

–

—

–

Threshold

0.1

0.75

2.0

µs

Disabled mode,

–

—

–

OUT = 0V

–

—

–

OUT Short-Circuit Current

(Reset Active)

1.20

1.25

1.30

VCC = 5V

PFI Input Threshold

0.8

VIL

WDI Threshold Voltage

(Note 4)

UNITS

MIN

TYP

MAX

–

—

–

Minimum Pulse Width

CONDITIONS

PARAMETER

0.4

ISINK = 3.2mA

3.5

ISOURCE = 1µA, VCC = 5V

–

—

–

Output Voltage

Output sink current

µA

100

Output source current

–

—

–

Short-Circuit Current

µs

VIN = 20mV, VOD = 15mV

PFI-to-

–

—

–

Delay

VIN = -20mV, VOD = 15mV

3.5

VCC = 5V, IOUT = -100µA

2.7

VCC = 0V, VBATT = 2.8V, IOUT = 1µA

–

—

–

OUT Output Voltage High

(Reset Active)

POWER-FAIL COMPARATOR

CHIP-ENABLE GATING

MANUAL RESET INPUT

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