LTC692/LTC693

5

0692fa

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Oscillator

OSC IN Input Current (Note 7)

±2

μA

OSC SEL Input Pull-Up Current (Note 7)

5

μA

OSC IN Frequency Range

OSC SEL = 0V

l

0

250

kHz

OSC IN Frequency with External Capacitor

4

kHz

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All voltage values are with respect to GND.

Note 3: For military temperature range, consult the factory.

Note 4: The output pins of BATT ON, LOW LINE, PFO, WDO, RESET and

RESET have weak internal pull-ups of typically 3μA. However, external

pull-up resistors may be used when higher speed is required.

Note 5: The LTC692/LTC693 have minimum reset active times of 140ms

(200ms typically). The reset active time of the LTC693 can be adjusted

(see Table 2 in Applications Information Section).

Note 6: The external clock feeding into the circuit passes through the

oscillator before clocking the watchdog timer (See Block Diagram).

Variation in the time-out period is caused by phase errors which occur

when the oscillator divides the external clock by 64. The resulting variation

in the time-out period is 64 clocks plus one clock of jitter.

Note 7: The input pins of CE IN, OSC IN and OSC SEL have weak internal

pull-ups which pull to the supply when the input pins are floating.