LTC1326 Datasheet | Linear Technology

LTC1326/LTC1326-2.5 Micropower Precision Triple Supply Monitors Features s DESCRIPTIO s s s s s s s s s Simultaneously Monitors Three Supplies LTC1326: 5V, 3.3V and ADJ LTC1326-2.5: 2.5V, 3.3V and ADJ Guaranteed Threshold Accuracy: ± 0.75% Low Supply Current: 20µA Internal Reset Time Delay: 200ms Manual Push-Button Reset Input Active Low and Active High Reset Outputs Active Low “Soft” Reset Output Power Supply Glitch Immunity Guaranteed RESET for VCC3 ≥ 1V or VCC5 ≥ 1V or VCC25 ≥ 1V 8-Pin SO and MSOP Packages The LTC®1326/LTC1326-2.5 are triple supply monitors intended for systems with multiple supply voltages. They provide micropower operation, small size and high accuracy supply monitoring. Tight 0.75% threshold accuracy and glitch immunity ensure reliable reset operation without false triggering. The 20µA typical supply current makes the LTC1326/ LTC1326-2.5 ideal for power-conscious systems. The RST output is guaranteed to be in the correct state for VCC3, VCC5 or VCC25 down to 1V. The LTC1326/LTC1326-2.5 can be configured to monitor one, two or three inputs, depending on system requirements. A manual push-button reset input provides the ability to generate a very narrow “soft” reset pulse (100µs typ) or a 200ms reset pulse equivalent to a power-on reset. Both SRST and RST outputs are open-drain and can be OR-tied with other reset sources. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s s s s Desktop puters Notebook puters Intelligent Instruments Portable Battery-Powered Equipment TYPICAL APPLICATIO DC/DC CONVERTER 2.5V 3.3V VCORE RST Output Voltage vs Supply Voltage (LTC1326-2.5) SYSTEM LOGIC 3.0 RST OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 VCC25 = VCCA = VCC3 4.7k PULL-UP FROM RST TO VCC3 TA = 25°C 0.1µF VCC25 VCC3 VCCA LTC1326-2.5 RST PBR PUSH-BUTTON RESET GND SRST 0 0 0.5 1.0 1.5 2.0 VCC3 (V) 2.5 3.0 3.5 1326/2.5 TA01 1326/2.5 TA02 LTC1326/LTC1326-2.5 ABSOLUTE (Notes 1, 2) AXI...