LTC1235(Rev0) 查看數據表（PDF） - Linear Technology
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LTC1235 Datasheet PDF : 16 Pages
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LTC1235
ELECTRICAL CHARACTERISTICS
VCC = Full Operating Range, VBATT = 2.8V, Backup = No Connection, TA = 25°C, unless otherwise noted.
PARAMETER
RESET and WDO Output Voltage
(Note 6)
RESET, RESET, WDO, LOW LINE
Output Short Circuit Current (Note 6)
WDI Input Threshold
WDI Input Current
Power Fail Detector
PFI Input Threshold
PFI Input Threshold PSRR
PFI Input Current
PFO Output Voltage (Note 6)
PFO Short Circuit Source Current
(Note 6)
PFI Comparator Response Time (falling)
PFI Comparator Response Time (rising)
(Note 6)
Chip Enable Gating
CE IN Threshold
CE IN Pullup Current (Note 4)
CE OUT Output Voltage
CE Propagation Delay
CE OUT Output Short Circuit Current
CONDITONS
ISINK = 1.6mA, VCC = 5V
SOURCE = 1µA, VCC = 4.25V
Output Source Current
Output Sink Current
Logic Low
Logic High
WDI = VOUT
WDI = 0V
VCC = 5V
ISINK = 3.2mA
ISOURCE = 1µA
PFI = HIGH, PFO = 0V
PFI = LOW, PFO = VOUT
∆VIN = –20mV, VOD = 15mV
∆VIN = 20mV, VOD = 15mV
with 10kΩ Pullup
VIL
VIH
ISINK = 3.2mA
ISOURCE = 3.0mA
ISOURCE = 1µA, VCC = 0V
VCC = 5V, CL = 20pF
Output Source Current
Output Sink Current
MIN
3.5
1
2.0
q
q –50
q 1.25
3.5
1
TYP
3
25
4
–8
1.3
0.3
±0.01
3
30
2
40
8
2.0
3
VOUT – 1.50
VOUT – 0.05
20
q
20
30
35
MAX UNITS
0.4
V
25
µA
mA
0.8
V
50
µA
1.35
V
mV/V
±25
nA
0.4
V
25
µA
mA
µs
µs
0.8
V
µA
0.4
V
35
ns
45
mA
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 3µA. 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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