MAX6304ESA 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6304ESA

+5V / Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog

Maxim Integrated 

+5V, Low-Power µP Supervisory Circuits

with Adjustable Reset/Watchdog

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.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

WATCHDOG TIMER

WDI, WDS Input Threshold

WDI Pulse Width

WDI, WDS Leakage Current

VIH

VIL

tWP

VCC = 4.5V to 5.5V

VCC = 2V to 4.5V

Extended mode disabled

0.7 x VCC

30

60

V

0.3 x VCC

ns

±1

µA

WDI Sink/Source Current (Note 4)

Extended mode enabled

±70

µA

Watchdog Timeout Period

(Note 3)

tWD

WDS = GND, CSWT = 1500pF

WDS = VCC, CSWT = 1500pF

2.8

4.0

5.2

ms

1.4

2.0

2.6

s

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.)

10,000

RESET TIMEOUT PERIOD

vs. CSRT

VCC = 5V

1000

10,000

EXTENDED-MODE

WATCHDOG TIMEOUT PERIOD vs. CSWT

(WDS = VCC)

VCC = 5V

1000

10,000

NORMAL-MODE

WATCHDOG TIMEOUT PERIOD vs. CSWT

(WDS = GND)

VCC = 5V

1000

100

100

100

10

10

10

1

1

1

0

0.001 0.01

0.1 1 10

CSRT (nF)

100 1000

0

0.001 0.01

0.1 1 10

CSWT (nF)

100 1000

0.1

0.001 0.01

0.1 1 10

CSWT (nF)

100 1000

_______________________________________________________________________________________ 3

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