LTC690 Просмотр технического описания (PDF) - Linear Technology
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LTC690 Datasheet PDF : 18 Pages
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LTC690/LTC691
LTC694/LTC695
ELECTRICAL CHARACTERISTICS The l 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)
CONDITIONS
Output Source Current
Output Sink Current
MIN
TYP
MAX
UNITS
1
3
25
μA
25
mA
WDI Input Threshold
Logic Low
Logic high
0.8
V
3.5
WDI Input Current
WDI = VOUT
WDI = 0V
l
4
50
μA
l
–50
–8
Power-Fail Detector
PFI Input Threshold
PFI Input Threshold PSRR
VCC = 5V
l 1.25
1.3
1.35
V
0.3
mV/V
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)
ISINK = 3.2mA
ISOURCE = 1μA
PFI = HIGH, PFO = 0V
PFI = LOW, PFO = VOUT
ΔVIN = –20mV, VOD = 15mV
ΔVIN = 20mV, VOD = 15mV
with 10kΩ Pull-Up
±0.01
±25
nA
0.4
V
3.5
1
3
25
μA
25
mA
2
μs
40
μs
8
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
VIL
VIH
ISINK = 3.2mA
ISOURCE = 3.0mA
ISOURCE = 1μA, VCC = 0V
VCC = 5V, CL = 20pF
Output Source Current
Output Sink Current
0.8
V
2
3
μA
VOUT – 1.50
VOUT – 0.05
0.4
V
20
35
ns
l
20
45
30
mA
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
l
0
250
kHz
OSC IN Frequency with External Capacitor
OSC SEL = 0V, COSC = 47pF
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 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 timeout period is caused by phase errors which occur
when the oscillator divides the external clock by 64. The resulting variation
in the timeout 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.
690fe
5
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