LTC690CN8 Linear Technology, LTC690CN8 Datasheet - Page 5

• Manufacturer Part Number: LTC690CN8
• Description: IC MPU SUPERVISORY CIRCUIT 8-DIP
• Manufacturer: Linear Technology
• Type: Simple Reset/Power-On Resetr

Specifications of LTC690CN8

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 35 ms Minimum
• Voltage - Threshold: 4.65V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ELECTRICAL CHARACTERISTICS
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
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.
range, otherwise specifications are at T
A
= 25°C. V
CONDITIONS
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
ΔV
ΔV
with 10kΩ Pull-Up
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
IL
IH
CC
CC
IN
IN
= 5V
= 5V, C
= –20mV, V
= 20mV, V
= 3.2mA
= 3.2mA
= full operating range, V
OUT
= 1μA
= 3.0mA
= 1μA, V
L
The
= 20pF
OD
OD
OSC
l
CC
= 15mV
denotes specifications which apply over the operating temperature
= 15mV
OUT
= 0V
= 47pF
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.
BATT
= 2.8V, unless otherwise noted.
l
l
l
l
l
V
V
OUT
OUT
1.25
MIN
–50
3.5
3.5
1
1
2
0
– 1.50
– 0.05
LTC690/LTC691
LTC694/LTC695
±0.01
TYP
1.3
0.3
–8
25
25
40
20
20
30
35
±2
3
4
3
2
8
3
5
4
MAX
1.35
±25
250
0.8
0.4
0.8
0.4
25
50
25
35
45
UNITS
mV/V
5
690fe
kHz
kHz
mA
mA
mA
μA
μA
nA
μA
μA
μA
μA
μs
μs
ns
V
V
V
V
V