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LTC1235CN Datasheet(PDF) 3 Page - Linear Technology |
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LTC1235CN Datasheet(HTML) 3 Page - Linear Technology |
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3 / 16 page  LTC1235 3 1235fa ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Battery Backup Switching Operating Voltage Range VCC VBATT 4.75 2.00 5.50 4.25 V V VOUT Output Voltage IOUT = 1mA IOUT = 50mA l VCC – 0.05 VCC – 0.1 VCC – 0.5 VCC – 0.005 VCC – 0.005 VCC – 0.25 V V V BACKUP Input Threshold VCC > Reset Voltage Threshold Logic Low Logic High 2.0 0.8 V V BACKUP Pullup Current (Note 4) 3μA VOUT in Battery Backup Mode (Note 5) IOUT = 250μA, VCC < VBATT VBATT – 0.1 VBATT – 0.02 V VOUT in Battery Saving Mode (Note 5) VCC < VBATT 1MΩ Pulldown on VOUT 0V V VCC Supply Current (excluding IOUT)IOUT ≤ 50mA l 0.6 0.6 1.5 2.5 mA mA Battery Supply Current in Battery Backup Mode and Battery Saving Mode (Note 5) VCC = 0V, VBATT = 2.8V l 0.04 0.04 1 5 μA μA Battery Standby Current (+ = Discharge, – = Charge) 5.5 > VCC > VBATT + 0.2V l –0.1 –1.0 +0.02 +0.10 μA μA Battery Switchover Threshold VCC – VBATT Power-Up Power-Down 70 50 mV mV Battery Switchover Hysteresis 20 mV BATT ON Output Voltage (Note 6) ISINK = 3.2mA 0.4 V BATT ON Output Short Circuit Current (Note 6) BATT ON = VOUT Sink Current BATT ON = 0V Source Current 0.5 35 125 mA μA Push-Button Reset PB RST Input Threshold Logic Low Logic High 2.0 0.8 V V PB RST Input Low Time (Notes 4, 7) l 40 ms Reset and Watchdog Timer Reset Voltage Threshold l 4.5 4.65 4.75 V Reset Threshold Hysteresis 40 mV Reset Active Time VCC = 5V l 60 140 200 200 240 280 ms ms Watchdog Time-out Period VCC = 5V l 1.2 1.0 1.6 1.6 2.00 2.25 sec sec Reset Active Time PSRR 1ms/V Watchdog Time-out Period PSRR 8ms/V Minimum WDI Input Pulse Width VIL = 0.4V, VIH = 3.5V l 200 ns RESET Output Voltage At VCC = 1V ISINK = 10μA, VCC = 1V 4 200 mV RESET and LOW LINE Output Voltage (Note 6) ISINK = 1.6mA, VCC = 4.25V ISOURCE = 1μA, VCC = 5V 3.5 0.4 V V RESET and WDO Output Voltage (Note 6) ISINK = 1.6mA, VCC = 5V ISOURCE = 1μA, VCC = 4.25V 3.5 0.4 V V The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = Full Operating Range, VBATT = 2.8V, Backup = No Connection, TA = 25°C, unless otherwise noted. |
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