LTC2917| Datasheet

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FEATURES

LTC2917/LTC2918 Voltage Supervisor with 27 Selectable Thresholds and Watchdog Timer DESCRIPTION
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 current of only 30A. Two three state inputs select one of nine internally programmed 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 external 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/L
TC2918-B suitable for automotive applications.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

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 Operation to 125 C Guaranteed Threshold Accuracy: 1.5% Low Quiescent Current: 30A Typical Power Supply Glitch Immunity Guaranteed RST for VCC 0.8V 10-Lead MSOP Packages and (3mm 2mm) DFN Packages

APPLICATIONS

Handheld Devices Cell Phone Base Stations Automotive Control Systems Network Servers Optical Networking Systems

TYPICAL APPLICATION
1.8V Supply Monitor with Manual Reset and Internal Timers Selected
1.8V

Monitor Selection Table
NOMINAL VOLTAGE 12V SEL1 VCC VCC VCC Open Open Open GND GND GND SEL2 VCC Open GND VCC Open GND VCC Open GND
29178fb

0.1F VCC LTC2918-A VM RT WT MR GND RST WDI SEL1 SEL2

10k

5V 3.3V
P RST I/O
29178 TA01

2.5V 1.8V 1.5V 1.2V 1V ADJ (0.5V)

tWDU = 1.6s tRST = 200ms

1

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LTC2917 DATASHEET