Programmable Quad Supply Monitor with Adjustable Reset Timer

The LTC2900 is a programmable supply monitor for systems with up to four supply voltages. One of 16 preset or adjustable voltage monitor combinations can be selected using an external resistor divider connected to the program pin. The preset voltage thresholds are accurateto ±1.5% over temperature.

The reset delay time is adjustable using an external capacitor and the manual reset input may be used with a momentary switch to issue reset pulses with programmed duration. 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. The LTC2900-1 features an open-drain RST output, while the LTC2900-2 has a push-pull RST output.

The 43µA supply current makes the LTC2900 ideal for power conscious systems and it may be configured to monitor less than four inputs. The parts are available in the 10-lead MSOP and the 10-lead 3mm × 3mm DFN packages.

Applications

* Desktop and Notebook Computers

* Multivoltage Systems

* Telecom Equipment

* Portable Battery-Powered Equipment

* Network Servers

* Simultaneously Monitors Four Supplies

* 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage Thresholds

* Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature

* Low Supply Current: 43µA Typ

* Adjustable Reset Time

* Small MSOP and 3mm × 3mm DFN Packages

* Manual Reset Pin

* Open-Drain RST Output (LTC2900-1)

* Push-Pull RST Output (LTC2900-2)

* Power Supply Glitch Immunity

* Guaranteed RST for VCC ≥ 1V