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LTC690 Datasheet(PDF) 4 Page - Linear Technology

Part No. LTC690
Description  Microprocessor Supervisory Circuits
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC690 Datasheet(HTML) 4 Page - Linear Technology

 
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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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