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Single Supervisor Monitors 27 Unique Voltage Thresholds Without External Resistors

MILPITAS, CA – August 13, 2007 – Linear Technology Corporation introduces the LTC2915, a single voltage supervisor with 27 unique pin-selectable thresholds, offering designers a diverse voltage monitor for many different solutions. Rather than qualifying and stocking multiple individual supervisors, each with their own unique voltage threshold, a single LTC2915 can easily be configured to meet different monitoring tasks. The LTC2915 can be used in applications ranging from network servers monitoring 12V to low-voltage portable equipment. The 27 selectable thresholds are specified with an overall accuracy of ±1.5% without the need for costly 0.1% external resistors. Offered in low-profile (

The LTC2915 includes two three-state input pins that select one of nine internally programmed thresholds: 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, or an adjustable 0.5V. A third three-state input determines if the input threshold is -5%, -10% or -15% below the selected voltage level, allowing for margining.

The LTC2916, a variation on the LTC2915, offers the same nine input thresholds, but with a fixed -5% tolerance. However, the LTC2916 includes a separate manual reset input for a simple push-button interface.

Both the LTC2915 and LTC2916 operate from a single 1.5V to 5.5V supply and consume only 30uA of quiescent current. To reduce sensitivity to short glitches from a noisy power supply, the LTC2915/LTC2916 input comparator’s glitch immunity ensures reliable reset operation without false triggering. These supervisors include an active-low reset output with a delay time that can be set to 200ms, 400us, or an adjustable period, allowing a processor time to initialize and load memory before it begins operating.

Both the LTC2915 and LTC2916 are available today in commercial, industrial, and automotive temperature grades, with pricing beginning at $1.05 each, in 1,000-piece quantities.

 
Summary of Features: LTC2915/LTC2916
•  Monitors 9 Selectable Supplies without External Resistors:
      •12V, 5V, 3.3V, 2.5V, 1.8V
      •1.5V, 1.2V, 1.0V, +ADJ (0.5V)
•  3 Selectable Tolerances:
      •-5%, -10%, -15% (LTC2915)
•  Manual Reset Input (LTC2916)
•  1.5V to 5.5V Supply Operation
•  Guaranteed Operation to 125°C
•  Guaranteed Threshold Accuracy: ±1.5%
•  6.5V Shunt Regulator for High Voltage Operation
•  Low Quiescent Current: 30uA
•  Power Supply Glitch Immunity
•  Guaranteed RST for VCC ≥ 0.8V
•  Low Profile ( (2mm × 3mm) DFN Packages
 
Supervisor Features 27 Selectable
Thresholds without External Resistors LTC2915-6 PR Image

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