MAX6301ESA datasheet(3/12 Pages) MAXIM

3 / 12 page

+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

CONDITIONS

VCC = 4.5V to 5.5V

0.7VCC

VIL

tWP

WDI Pulse Width

WDI, WDS Input Threshold

VCC = 2V to 4.5V

VIH

0.3VCC

WDI, WDS Leakage Current

Extended mode disabled

±1

µA

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

WDI Sink/Source Current

(Note 4)

Extended mode enabled

±70

µA

tWD

WDS = GND, CSWT = 1500pF

2.8

4.0

5.2

Watchdog Timeout Period

(Note 3)

WDS = VCC, CSWT = 1500pF

1.4

2.0

2.6

sec

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.)

WATCHDOG TIMER

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

Note 2: VDS = 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.)

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