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LTC2905CTS8TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC2905CTS8TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC2904/LTC2905 1 29045fd TYPICAL APPLICATION DESCRIPTION Precision Dual Supply Monitors with Pin-Selectable Thresholds The LTC®2904/LTC2905 are dual supply monitors in- tended for systems with two supply voltages. The dual supply monitors have a common reset output with delay (200ms for the LTC2904 and adjustable using an exter- nal capacitor for the LTC2905). This product provides a precise, space-conscious and micropower solution for supply monitoring. The LTC2904/LTC2905 feature a tight 1.5% threshold accuracy over the whole operating temperature range, and glitch immunity to ensure reliable reset operation without false triggering. The open drain RST output is guaranteed to be in the correct state for inputs down to 1V. The LTC2904/LTC2905 also feature three programming input pins, which program the threshold and tolerance level without requiring any external components. These three programming pins provide a total of 27 different voltage level and tolerance combinations, eliminating the need to have different parts for development and implementation of different systems with different voltage levels requiring monitoring function. 5V, 3.3V Dual Supply Monitor with 5% Tolerance FEATURES APPLICATIONS n Monitors Two Inputs Simultaneously n Nine Threshold Combinations n Three Supply Tolerances (5%, 7.5%, 10%) n Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature n Internal VCC Auto Select n Power Supply Glitch Immunity n 200ms Reset Time Delay (LTC2904 Only) n Adjustable Reset Time Delay (LTC2905 Only) n Open Drain RST Output n Guaranteed RST for V1 ≥ 1V or V2 ≥ 1V n Low Profile (1mm) SOT-23 (ThinSOT™) and Plastic (3mm × 2mm) DFN Packages n Desktop and Notebook Computers n Handheld Devices n Network Servers n Core, I/O Monitor Table 1. Voltage Threshold Programming V1 V2 S1 S2 5.0 3.3 V1 V1 3.3 2.5 Open GND 3.3 1.8 V1 Open 3.3 1.5 Open V1 3.3 1.2 Open Open 2.5 1.8 GND GND 2.5 1.5 GND Open 2.5 1.2 GND V1 2.5 1.0 V1 GND V1 S1 S2 TOL V2 TMR GND RST LTC2905 22nF 0.1μF 0.1μF DC/DC CONVERTER SYSTEM LOGIC 29045 TA01 3.3V 5V L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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