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LTC695ISW Datasheet(PDF) 4 Page - Linear Technology |
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LTC695ISW Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page 4 LTC690/LTC691 LTC694/LTC695 ELECTRICAL C C HARA TERISTICS The q denotes specifications which apply over the operating temperature range, otherwise specifications are at TA = 25°C. VCC = full operating range, VBATT = 2.8V, unless otherwise noted. PARAMETER CONDITONS MIN TYP MAX UNITS RESET, RESET, WDO, LOW LINE Output Source Current 1 3 25 µA Output Short-Circuit Current (Note 4) Output Sink Current 25 mA WDI Input Threshold Logic Low 0.8 V Logic High 3.5 WDI Input Current WDI = VOUT q 450 µA WDI = 0V q –50 – 8 Power-Fail Detector PFI Input Threshold VCC = 5V q 1.25 1.3 1.35 V PFI Input Threshold PSRR 0.3 mV/V PFI Input Current ±0.01 ±25 nA PFO Output Voltage (Note 4) ISINK = 3.2mA 0.4 V ISOURCE = 1µA 3.5 PFO Short-Circuit Source Current (Note 4) PFI = HIGH, PFO = 0V 1 3 25 µA PFI = LOW, PFO = VOUT 25 mA PFI Comparator Response Time (Falling) ∆VIN = –20mV, VOD = 15mV 2 µs PFI Comparator Response Time (Rising) (Note 4) ∆VIN = 20mV, VOD = 15mV 40 µs with 10k Ω Pull-Up 8 Chip Enable Gating CE IN Threshold VIL 0.8 V VIH 2.0 CE IN Pull-Up Current (Note 7) 3 µA CE OUT Output Voltage ISINK = 3.2mA 0.4 V ISOURCE = 3.0mA VOUT – 1.50 ISOURCE = 1µA, VCC = 0V VOUT – 0.05 CE Propagation Delay VCC = 5V, CL = 20pF 20 35 ns q 20 45 CE OUT Output Short-Circuit Current Output Source Current 30 mA Output Sink Current 35 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 q 0 250 kHz OSC IN Frequency with External Capacitor OSC SEL = 0V, COSC = 47pF 4 kHz Note 1: Absolute Maximum Ratings are those values beyond which the life of device may be impaired. Note 2: All voltage values are with respect to GND. Note 3: For military temperature range parts or for the LTC692 and LTC693, 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 3 µA. However, external pull-up resistors may be used when higher speed is required. Note 5: The LTC690 and LTC691 have minimum reset active time of 35ms (50ms typically) while the LTC694 and LTC695 have longer minimum reset active time of 140ms (200ms typically). The reset active time of the LTC691 and LTC695 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 pullups which pull to the supply when the input pins are floating. |
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