ltc690cs8-trpbf Linear Technology Corporation, ltc690cs8-trpbf Datasheet - Page 4

• Manufacturer Part Number: ltc690cs8-trpbf
• Description: Microprocessor Supervisory Circuits
• Manufacturer: Linear Technology Corporation

LTC690/LTC691
LTC694/LTC695
ELECTRICAL C
range, otherwise specifications are at T
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 A. 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
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
4
HARA TERISTICS
C
A
= 25 C. V
CONDITONS
Output Source Current
Output Sink Current
Logic Low
Logic High
WDI = V
WDI = 0V
V
I
I
PFI = HIGH, PFO = 0V
PFI = LOW, PFO = V
V
V
I
I
I
V
Output Source Current
Output Sink Current
OSC SEL = 0V
OSC SEL = 0V, C
SINK
SOURCE
SINK
SOURCE
SOURCE
CC
CC
V
V
IL
IH
CC
with 10k Pull-Up
IN
IN
= 5V
= 5V, C
= full operating range, V
= 3.2mA
= –20mV, V
= 20mV, V
= 3.2mA
OUT
= 1 A
= 3.0mA
= 1 A, V
The
L
= 20pF
OD
CC
OSC
OD
denotes specifications which apply over the operating temperature
= 15mV
= 0V
OUT
= 15mV
= 47pF
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.
BATT
= 2.8V, unless otherwise noted.
V
V
OUT
OUT
1.25
MIN
– 50
3.5
3.5
2.0
1
1
0
– 1.50
– 0.05
TYP
1.3
0.3
– 8
0.01
25
25
40
20
20
30
35
3
4
3
2
8
3
5
4
2
MAX
1.35
250
0.8
0.4
0.8
0.4
25
50
25
35
45
25
UNITS
mV/V
kHz
kHz
mA
mA
mA
nA
ns
A
V
A
V
V
A
V
A
V
A
A
s
s