ltc1985 Linear Technology Corporation, ltc1985 Datasheet
ltc1985
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ltc1985 Summary of contents
Page 1
... V CC18 configured to monitor any one or two V of three, depending on system requirements. Very low (10 A typical) supply current makes the LTC1985 ideal for power conscious systems. The LTC1985 is available in a 5-lead SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. ...
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... OH Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: All voltage values are with respect to GND. Note 3: The LTC1985E is guaranteed to meet specified performance from and is designed, characterized and assured to meet the 2 U PACKAGE/ORDER I FOR ATIO + 0 ...
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... TEMPERATURE ( C) Reset Pulse Width vs Temperature 280 260 240 220 200 180 160 140 100 –60 –40 – TEMPERATURE ( C) CC LTC1985-1.8 V Input Current CCA vs Input Voltage 2 1.5 1.0 0.5 0 – 0.5 –1.0 –1.5 – 2.0 80 0.80 0.85 0.95 1 1.05 100 0.90 INPUT VOLTAGE (V) 1985-18 G02 ...
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... I (mA) SINK 1985-81 G11 V (Pin 4): 1.8V Sense Input and Power Supply Pin. CC18 This pin is used on the LTC1985 to provide power to the part when the voltage Bypass to ground with a CC3 capacitor. V (Pin 5): 3V Sense Input and Power Supply Pin. This CC3 pin provides power to the part when the voltage on V ...
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... W BLOCK DIAGRA V 5 CC3 POWER DETECT V 4 CC18 V 3 CCA GND DIAGRA V CCX RST – INTERNAL CC – 200ms PULSE GENERATOR 200ms + DELAY – + BANDGAP REFERENCE V Monitor Timing CC V RTX t RST t UV 1.5V LTC1985-1.8 LTC1985-1.8 V CC3 1 RST 1985-18 BD 1985- ...
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... All three V inputs must be above predetermined thresh- CC olds for reset not to be invoked. The LTC1985 will assert reset during power-up, power-down and brownout condi- tions on any one or all of the V inputs 1.8V Power Detect The LTC1985 is powered from the 3V input pin (V the 1 ...
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... TA04 ADJUSTABLE RESET TRIP THRESHOLD 2.31V LTC1985-1.8 Input) CCA LTC1985-1 RST SYSTEM RESET CC3 4 V CC18 3 V CCA 2 GND 1985-18 TA03 Tied to DC/DC Feedback Divider CCA 2.5V 27.4k LTC1985-1 SYSTEM RESET V RST CC3 4 2.26k 1.8V V CC18 CCA 2 22.6k GND 1% 1985-18 TA05 7 ...
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... FIVE PLACES (NOTE 2) (NOTE 2) SYSTEM RESET 1 RST V CC3 LTC1985-1.8 V CC18 V CCA GND 1985-18 TA07 2 2.80 – 3.00 (0.110 – 0.118) (NOTE 3) 0.95 1.90 (0.037) (0.074) REF REF ...