LTC1235CS Ver la hoja de datos (PDF) - Linear Technology
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LTC1235CS 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
CONDITONS
MIN
TYP
Battery Backup Switching
Operating Voltage Range
VCC
VBATT
VOUT Output Voltage
BACKUP Input Threshold
IOUT = 1mA
IOUT = 50mA
VCC > Reset Voltage Threshold
Logic Low
Logic High
4.75
2.00
VCC – 0.05
q VCC – 0.1
VCC – 0.5
VCC – 0.005
VCC – 0.005
VCC – 0.25
2.0
BACKUP Pullup Current (Note 4)
3
VOUT in Battery Backup Mode (Note 5)
VOUT in Battery Saving Mode (Note 5)
VCC Supply Current (excluding IOUT)
IOUT = 250µA, VCC < VBATT
VCC < VBATT
1MΩ Pulldown on VOUT
IOUT ≤ 50mA
VBATT – 0.1
VBATT – 0.02
0
0.6
q
0.6
Battery Supply Current in Battery Backup Mode and VCC = 0V, VBATT = 2.8V
0.04
Battery Saving Mode (Note 5)
q
0.04
Battery Standby Current
(+ = Discharge, – = Charge)
5.5 > VCC > VBATT + 0.2V
– 0.1
q
–1.0
Battery Switchover Threshold
Power Up
70
VCC – VBATT
Power Down
50
Battery Switchover Hysteresis
20
BATT ON Output Voltage (Note 6)
BATT ON Output Short Circuit Current (Note 6)
ISINK = 3.2mA
BATT ON = VOUT Sink Current
BATT ON = 0V Source Current
35
0.5
1
Push-Button Reset
PB RST Input Threshold
Logic Low
Logic High
2.0
PB RST Input Low Time (Notes 4, 7)
q
40
Reset and Watchdog Timer
Reset Voltage Threshold
q
4.5
4.65
Reset Threshold Hysteresis
40
Reset Active Time
VCC = 5V
160
200
q
140
200
Watchdog Time-out Period
VCC = 5V
1.2
1.6
q
1.0
1.6
Reset Active Time PSRR
1
Watchdog Time-out Period PSRR
8
Minimum WDI Input Pulse Width
RESET Output Voltage At VCC = 1V
RESET and LOW LINE Output Voltage
(Note 6)
VIL = 0.4V, VIH = 3.5V
q
200
ISINK = 10µA, VCC = 1V
4
ISINK = 1.6mA, VCC = 4.25V
ISOURCE = 1µA, VCC = 5V
3.5
MAX UNITS
5.50
V
4.25
V
0.8
V
µA
V
V
1.5
mA
2.5
1
µA
5
+0.02
µA
+0.10
mV
mV
0.4
V
mA
25
µA
0.8
V
ms
4.75
V
mV
240
ms
280
2.00
sec
2.25
ms/V
ms/V
ns
200
mV
0.4
V
3
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