MAX6301ESA datasheet(3/12 Pages) MAXIM

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+5V, Low-Power µP Supervisory Circuits

with Adjustable Reset/Watchdog

_______________________________________________________________________________________

10,000

0.001

0.01

0.1

100

1000

RESET TIMEOUT PERIOD

vs. CSRT

CSRT (nF)

100

1000

VCC = 5V

10,000

0.001

0.01

0.1

100

1000

EXTENDED-MODE

WATCHDOG TIMEOUT PERIOD vs. CSWT

(WDS = VCC)

CSWT (nF)

100

1000

VCC = 5V

10,000

0.1

0.001

0.01

0.1

100

1000

NORMAL-MODE

WATCHDOG TIMEOUT PERIOD vs. CSWT

(WDS = GND)

CSWT (nF)

100

1000

VCC = 5V

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)

Note 1: Reset is guaranteed valid from the selected reset threshold voltage down to the minimum VCC.

Note 2: WDS = VCC, WDI unconnected.

Note 3: Precision timing currents of 500nA are present at both the SRT and SWT pins. Timing capacitors connected to these nodes

must have low leakage consistent with these currents to prevent timing errors.

Note 4: The sink/source is supplied through a resistor, and is proportional to VCC (Figure 8). At VCC = 2V, it is typically ±24µA.

__________________________________________Typical Operating Characteristics

(CSWT = CSRT = 1500pF, TA = +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

WATCHDOG TIMER

VIH

0.7 x VCC

WDI, WDS Input Threshold

VIL

0.3 x VCC

VCC = 4.5V to 5.5V

WDI Pulse Width

tWP

VCC = 2V to 4.5V

WDI, WDS Leakage Current

Extended mode disabled

±1

µA

WDI Sink/Source Current (Note 4)

Extended mode enabled

±70

µA

WDS = GND, CSWT = 1500pF

2.8

4.0

5.2

Watchdog Timeout Period

(Note 3)

tWD

WDS = VCC, CSWT = 1500pF

1.4

2.0

2.6

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