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MAX697C

Microprocessor Supervisory Circuits

Maxim Integrated 

MAX696/MAX697

Microprocessor Supervisory Circuits

Electrical Characteristics (continued)

(VCC = full operating range, VBATT = 2.8V, TA = +25°C, unless otherwise noted.)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Watchdog Timeout Period,

External Clock

Long period

Short period

4032

960

4097

1025

Clock

cycles

Minimum WDI Input Pulse Width

RESET and RESET Output

Voltage (Note 2)

LOW LINE and WDO Output

Voltage

Output Short-Circuit Current

VIL = 0.4V, VIH = 3.5V, VCC = 5V

ISINK = 400µA, VCC = 2V, VBATT = 0V

ISINK = 1.6mA, 3V < VCC < 5.5V

ISOURCE = 1µA, VCC = 5V

ISINK = 800µA, TA = full

ISOURCE = 1µA, VCC = 5V, TA = full

RESET, RESET, WDO, LOW LINE

200

ns

0.4

0.4

V

3.5

0.4

V

3.5

1

3

25

µA

WDI Input Threshold

VCC = 5V

(Note 3)

Logic-low

Logic-high (MAX696)

Logic-high (MAX697)

0.8

3.5

V

3.8

WDI Input Current

POWER-FAIL DETECTOR

VWDI = VOUT

VWDI = 0V

20

50

µA

-50

-15

PFI Input Threshold

PFI - LLIN Threshold Difference

PFI Input Current

VCC = 3V, 5V

VCC = 3V, 5V

1.2

1.3

1.4

V

±15 ±50

mV

±0.01 ±25

nA

LLIN Input Current

MAX697

MAX696

-25 ±0.01 +25

nA

-500 ±0.01 +25

PFO Output Voltage

ISINK = 1.6mA

ISOURCE = 1µA, VCC = 5V

PFO Short-Circuit Source Current VPFI = 0V, VPFO = 0V

CHIP-ENABLE GATING (MAX697)

0.4

V

3.5

1

3

25

µA

CE IN Thresholds

CE IN Pullup Current

VIL

VIH, VCC = 5V

0.8

V

3.0

3

µA

CE OUT Output Voltage

CE Propagation Delay

OSCILLATOR

ISINK = 1.6mA

ISOURCE = 800µA

ISOURCE = 1µA, VCC = 0V

VCC = 5V

0.4

VCC - 0.5V

V

VCC - 0.05V

80

150

ns

OSC IN Input Current

±2

µA

OSC SEL Input Pullup Current

5

µA

OSC IN Frequency Range

OSC IN Frequency with External

Capacitor

VOSC SEL = 0V

VOSC SEL = 0V, COSC = 47pF

0

250

kHz

4

kHz

Note 2: TA = full operating range

Note 3: WDI is guaranteed to be in the mid-level (inactive) state if WDI is floating and VCC is in the operating voltage range. WDI is

internally biased to 38% of VCC with an impedance of approximately 125kΩ.

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