LTC690M View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC690M Datasheet PDF : 16 Pages
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LTC690/LTC691
LTC694/LTC695
ELECTRICAL CHARACTERISTICS 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
RESET, RESET, WDO, LOW LINE
Output Short-Circuit Current (Note 4)
WDI Input Threshold
WDI Input Current
Power-Fail Detector
PFI Input Threshold
PFI Input Threshold PSRR
PFI Input Current
PFO Output Voltage (Note 4)
PFO Short-Circuit Source Current (Note 4)
PFI Comparator Response Time (Falling)
PFI Comparator Response Time (Rising) (Note 4)
Chip Enable Gating
CE IN Threshold
CE IN Pull-Up Current (Note 7)
CE OUT Output Voltage
CE Propagation Delay
CE OUT Output Short-Circuit Current
Oscillator
OSC IN Input Current (Note 7)
OSC SEL Input Pull-Up Current (Note 7)
OSC IN Frequency Range
OSC IN Frequency with External Capacitor
CONDITONS
Output Source Current
Output Sink Current
Logic Low
Logic High
WDI = VOUT
WDI = 0V
VCC = 5V
ISINK = 3.2mA
ISOURCE = 1µA
PFI = HIGH, PFO = 0V
PFI = LOW, PFO = VOUT
∆VIN = –20mV, VOD = 15mV
∆VIN = 20mV, VOD = 15mV
with 10kΩ Pull-Up
VIL
VIH
ISINK = 3.2mA
ISOURCE = 3.0mA
ISOURCE = 1µA, VCC = 0V
VCC = 5V, CL = 20pF
Output Source Current
Output Sink Current
OSC SEL = 0V
OSC SEL = 0V, COSC = 47pF
MIN
1
3.5
q
q – 50
q 1.25
3.5
1
TYP
3
25
4
–8
1.3
0.3
± 0.01
3
25
2
40
8
2.0
3
VOUT – 1.50
VOUT – 0.05
20
q
20
30
35
±2
5
q
0
4
MAX UNITS
25
µA
mA
0.8
V
50
µA
1.35
V
mV/V
±25
nA
0.4
V
25
µA
mA
µs
µs
0.8
V
µA
0.4
V
35
ns
45
mA
µA
µA
250
kHz
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 3µA. 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.
4
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