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LTC2938IMS Datasheet(PDF) 1 Page - Linear Technology |
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LTC2938IMS Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC2938/LTC2939 1 293839ff V1 (V) V2 (V) V3 (V) V4 (V) V5 (V) V6 (V) 5 3.3 2.5 1.8 ADJ ADJ 5 3.3 2.5 ADJ ADJ ADJ 5 3.3 1.8 ADJ ADJ ADJ 5 3.3 ADJ ADJ ADJ ADJ 5 3.3 ADJ – ADJ ADJ ADJ 3.3 2.5 1.8 1.5 ADJ ADJ 3.3 2.5 1.8 ADJ ADJ ADJ 3.3 1.8 1.5 1.2 ADJ ADJ 3.3 1.8 1.5 ADJ ADJ ADJ 3.3 1.8 1.2 ADJ ADJ ADJ 3.3 2.5 ADJ ADJ ADJ ADJ 3.3 2.5 ADJ –ADJ ADJ ADJ 3.3 1.8 ADJ ADJ ADJ ADJ 3.3 1.8 ADJ –ADJ ADJ ADJ 3.3 1.5 ADJ ADJ ADJ ADJ 3.3 1.2 ADJ ADJ ADJ ADJ TYPICAL APPLICATION DESCRIPTION Configurable 4- and 6-Supply Monitors with Watchdog Timer The LTC®2938/LTC2939 are configurable supply monitors for systems with up to four or six supply voltages that need watchdog supervision. One of sixteen preset or adjustable voltage monitor combinations can be selected using an external resistive divider connected to the program input. The preset voltage thresholds are accurate to ±1.5% over temperature. The LTC2938 and LTC2939 also feature ad- justable inputs with a 0.5V nominal threshold. The reset and watchdog timeout periods are adjustable using external capacitors. Tight voltage threshold accuracy and glitch immunity ensure reliable reset operation without false triggering. The RST output is guaranteed to be in the correct state for VCC down to 1V. Each status output has a weak internal pull-up and may be externally pulled up to a user-defined voltage. The 80μA supply current makes the LTC2938 and LTC2939 ideal for power conscious systems. The LTC2939 moni- tors up to six supplies and the LTC2938 monitors up to four supplies. 6-Supply Monitor 12V (ADJ), 5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ) FEATURES APPLICATIONS n Simultaneously Monitors Four (LTC2938) or Six Supplies (LTC2939) n Sixteen User-Selectable Combinations of 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V and/or ± Adjustable Voltage Thresholds n Guaranteed Threshold Accuracy: ±1.5% n Adjustable Reset and Watchdog Timeout n Low Supply Current: 80μA Typical n Power Supply Glitch Immunity n Guaranteed RST for VCC > 1V n High Temperature Operation to 125°C n 12-Pin 4mm × 3mm DFN or 12-Lead MSOP (LTC2938) and 16-Lead MSOP Package (LTC2939) n Desktop and Notebook Computers n Multivoltage Systems n Telecom Equipment n Network Servers n Automotive Control Systems Voltage Configuration Table LTC2939 1.2V 1.8V 2.5V 3.3V 5V 12V 293839 TA01 tRST = 94ms tWD = 940ms CWT 47nF CRT 47nF RST WDO WDI VPG VREF GND CWT CRT V1 V2 V3 V4 V5 V6 SYSTEM LOGIC R1 59k 1% 100k 1% 100k 1% 124k 1% 2150k 1% R2 40.2k 1% 0.1μF 0.1μF L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6967591, 7239251, 7119714. |
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