Programmable Quad Supply Monitor with Adjustable Reset and Watchdog Timers

The LTC2901 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 accurate to ±1.5% over temperature. All four voltage comparator outputs are connected to separate pins for individual supply monitoring.

The reset and watchdog delay times 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. The LTC2901-1/LTC2901-3 features an open-drain RST output, while the LTC2901-2/LTC2901-4 has a push-pull RST output.

The 43µA supply current makes the LTC2901 ideal for power conscious systems and it may be configured to monitor less than four inputs. The parts are available in the 16-lead narrow SSOP package.

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 ±Adj Voltage Thresholds

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

* Selectable Supply Tolerance: 5% and 10% Below Monitored Voltage (LTC2901-3/LTC2901-4)

* Low Supply Current: 43µA Typ

* Adjustable Reset Time

* Adjustable Watchdog Time

* Open-Drain RST Output (LTC2901-1/LTC2901-3)

* Push-Pull RST Output (LTC2901-2/LTC2901-4)

* Individual Nondelayed Monitor Output for Each Supply

* Power Supply Glitch Immunity

* Guaranteed RST for VCC ≥ 1V

* 16-Lead Narrow SSOP Package