MAX6321 datasheet(3/14 Pages) MAXIM

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5-Pin µP Supervisory Circuits with

Watchdog and Manual Reset

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Note 4: This is the minimum time RESET must be held low by an external pulldown source to set the active pullup flip-flop.

Note 5: Measured from RESET VOL to (0.8 x VCC), RLOAD = ∞.

Note 6: WDI is internally serviced within the watchdog period if WDI is left unconnected.

Note 7: The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is

designed for a three-stated-output device with a 10µA maximum leakage current and capable of driving a maximum capac-

itive load of 200pF. The three-state device must be able to source and sink at least 200µA when active.

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 2.5V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

BIDIRECTIONAL

RESET OUTPUT (MAX6316M/MAX6318MH/MAX6319MH)

Transitional Flip-Flop Setup Time

(Note 4)

400

VCC = 3.0V, CL = 120pF

333

VCC = 5.0V, CL = 200pF

333

VCC = 3.0V, CL = 250pF

666

RESET Output Rise Time

(Note 5)

VCC = 5.0V, CL = 400pF

666

Active Pullup Enable Threshold

VPTH

VCC = 5.0V

0.4

0.65

RESET Active Pullup Current

VCC = 5.0V

TA = -40°C to +85°C

4.2

4.7

5.2

RESET Pullup Resistance

TA = -40°C to +125°C

3.6

4.7

5.8

Ω

OPEN-DRAIN

RESET OUTPUT (MAX6320P/MAX6321HP/MAX6322HP)

VCC > 1.0V, ISINK = 50µA

0.3

VCC > 1.2V, ISINK = 100µA

0.3

VCC > 2.7V, ISINK = 1.2mA

0.3

RESET Output Voltage

VOL

VCC > 4.5V, ISINK = 3.2mA

0.4

Open-Drain Reset Output

Leakage Current

ILKG

1.0

µA

WATCHDOG INPUT (MAX6316/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP)

MAX63_ _ _W-T

4.3

6.3

9.3

MAX63_ _ _X-T

102

153

MAX63_ _ _Y-T

1.12

1.6

2.4

Watchdog Timeout Period

tWD

MAX63_ _ _Z-T

17.9

25.6

38.4

WDI Pulse Width

tWDI

VIL = 0.3 x VCC, VIH = 0.7 x VCC

VIL

0.3 xVCC

WDI Input Threshold

VIH

(Note 6)

0.7 x VCC

WDI = VCC, time average

120

160

WDI Input Current

(Note 7)

IWDI

VWDI = 0V, time average

-20

-15

µA

MANUAL RESET INPUT (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP)

VIL

0.8

VIH

VTH > 4.0V

2.0

VIL

0.3 xVCC

MR Input Threshold

VIH

VTH < 4.0V

0.7 x VCC

TA = -40°C to +85°C

MR Input Pulse Width

TA = -40°C to +125°C

1.5

µs

MR Glitch Rejection

100

MR Pullup Resistance

Ω

MR to Reset Delay

VCC = 5V

230

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