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LTC2917CMS-B1TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC2917CMS-B1TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC2917/LTC2918 1 29178f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Low Voltage Supervisor with 27 Selectable Thresh- olds and Watchdog Timer The LTC®2917-A/LTC2917-B and LTC2918-A/LTC2918-B are low voltage single-supply monitors with selectable thresholds and an adjustable watchdog timer. The parts operate from 1.5V to 5.5V and consume a quiescent cur- rent of only 30μA. Two three state inputs select one of nine internally pro- grammed thresholds without the need for external resistors. For the LTC2917, an additional three state input determines the tolerance (–5%, –10%, –15%). The tolerance for the LTC2918 is fixed at –5%. Threshold accuracy is guaranteed at ±1.5% over the entire operating temperature range. Glitch filtering ensures reliable reset operation without false triggering. The reset timeout and the watchdog timeout may be set with no external components, or adjusted using an exter- nal capacitor. A windowed watchdog feature is available for high-reliability applications (B1 versions). A separate manual reset input on the LTC2918-A/LTC2918-B allows a simple push button interface. Operation to 125°C makes the LTC2917-A/LTC2917-B and LTC2918-A/LTC2918-B suitable for automotive ap- plications. 1.8V Supply Monitor with Manual Reset and Internal Timers Selected ■ 9 Selectable Supply Voltages 12V, 5V, 3.3V, 2.5V, 1.8V 1.5V, 1.2V, 1V, +ADJ (0.5V) ■ 3 Selectable Tolerances –5%, –10%, –15% (LTC2917) ■ Manual Reset Input (LTC2918) ■ 1.5V to 5.5V Supply Operation ■ Adjustable Watchdog Timeout ■ Windowed Watchdog Timeout for Higher Reliability Applications (LTC2917-B, LTC2918-B) ■ 6.2V Shunt Regulator for High Voltage Operation ■ Guaranteed to 125˚C ■ Guaranteed Threshold Accuracy: ±1.5% ■ Low Quiescent Current: 30μA Typical ■ Power Supply Glitch Immunity ■ Guaranteed ⎯R⎯S⎯T for VCC ≥ 0.8V ■ 10-Lead MSOP Packages and (3mm × 2mm) DFN Packages ■ Handheld Devices ■ Cell Phone Base Stations ■ Automotive Control Systems ■ Network Servers ■ Optical Networking Systems NOMINAL VOLTAGE SEL1 SEL2 12V VCC VCC 5V VCC Open 3.3V VCC GND 2.5V Open VCC 1.8V Open Open 1.5V Open GND 1.2V GND VCC 1V GND Open ADJ (0.5V) GND GND , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1.8V 10k 29178 TA01 VM WDI RT WT SEL1 SEL2 MR GND VCC LTC2918-A μP RST RST I/O 0.1 μF tWDU = 1.6s tRST = 200ms Monitor Selection Table |
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