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LTC1235 Datasheet(PDF) 4 Page - Linear Technology

Part No. LTC1235
Description  Microprocessor Supervisory Circuit
Download  16 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1235 Datasheet(HTML) 4 Page - Linear Technology

 
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LTC1235
PARAMETER
CONDITONS
MIN
TYP
MAX
UNITS
RESET and WDO Output Voltage
ISINK = 1.6mA, VCC = 5V
0.4
V
(Note 6)
SOURCE = 1µA, VCC = 4.25V
3.5
RESET, RESET, WDO, LOW LINE
Output Source Current
1
3
25
µA
Output Short Circuit Current (Note 6)
Output Sink Current
25
mA
WDI Input Threshold
Logic Low
0.8
V
Logic High
2.0
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 6)
ISINK = 3.2mA
0.4
V
ISOURCE = 1µA
3.5
PFO Short Circuit Source Current
PFI = HIGH, PFO = 0V
1
3
25
µA
(Note 6)
PFI = LOW, PFO = VOUT
30
mA
PFI Comparator Response Time (falling)
∆VIN = –20mV, VOD = 15mV
2
µs
PFI Comparator Response Time (rising)
∆VIN = 20mV, VOD = 15mV
40
µs
(Note 6)
with 10k
Ω Pullup
8
Chip Enable Gating
CE IN Threshold
VIL
0.8
V
VIH
2.0
CE IN Pullup Current (Note 4)
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
VCC = Full Operating Range, VBATT = 2.8V, Backup = No Connection, TA = 25°C, unless otherwise noted.
ELECTRICAL C
C
HARA TERISTICS
The q denotes specifications which apply over the operating temperature
range.
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, consult the factory.
Note 4: The input pins of PB RST, BACKUP and CE IN, have weak internal
pullups which pull to the supply when the input pins are floating.
Note 5: The LTC1235 can be programmed either to provide or not to
provide battery backup power to the VOUT pin during power failure. The
power down condition of VOUT is selected by the logic level of the BACKUP
pin which is latched internally when VCC falls through the reset voltage
threshold. If the latched logic level of the BACKUP pin is high, VOUT will be
in Battery Backup Mode and will be switched to VBATT when VCC falls
below VBATT. If the latched logic level of the BACKUP pin is low, VOUT will
be in Battery Saving Mode when VCC falls below VBATT.
Note 6: The output pins of BATT ON, LOW LINE, PFO, WDO, RESET and
RESET have weak internal pullups of typically 3
µA. However, external
pullup resistors may be used when higher speed is required.
Note 7: The push-button reset input requires an active low signal.
Internally, this input signal is debounced and timed for a minimum of
40ms. When this condition is satisfied, the reset outputs go to the active
states. The reset outputs will remain in active states for a minimum of
140ms from the moment the push-button reset input is released from
logic low level.


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