Datasheet Linear Technology LTC2903-D1

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  Low Voltage Wizardry Provides the Ultimate Power-On Reset Circuit &mdash LT Journal
  PDF, 135 Kb, File published: Dec 1, 2003
  Extract from the document

  DESIGN FEATURES Low Voltage Wizardry Provides the
  Ultimate Power-On Reset Circuit
  by Bob Jurgilewicz The Low Voltage
  Reset Problem VRST
  VIN Figure 2. Traditional NMOS pull-down circuit 14 5V
  3.3V DC/DC
  CONVERTER 2.5V
  1.8V SYSTEM
  LOGIC C1
  0.1ВµF
  C2
  0.1ВµF LTC2903B-2
  V1
  RST
  GND V4 V2 V3 Figure 1. Typical application using the LTC2903B for quad supply monitoring inside the chip). Second, there is a
  limit to how small the external resistor
  can be before the resistor overcomes
  the pull-up strength of the PMOS
  transistor. Third, low power systems
  will suffer while the reset node is logic
  high, since the external resistor will
  continuously dissipate power. With
  a 5V output and a 100kО© external …

Manufacturer's Classification

• Monitor, Control and Protection > Supervisory Circuits > Quad or More Supply Monitors