STMicroelectronics Supplier Page
STM6904 / STM6905
STMicroelectronics and Digi-Key Introduce the Quadruple and Quintuple Ultra Low Voltage Supervisor with Push-Button Reset

STMicroelectronics STM6904/6905 image
The STM6905 supervisor is a low voltage/low supply current processor supervisor, designed to monitor up to five system power supply voltages. This device is targeted at applications such as set-top boxes (STBs), portable, battery-powered systems, and networking and communication systems.

The device supports a push-button type manual reset input (MR). Two of the five supply monitors (VCC and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds (VRST1 and VRST2). The other three voltage monitor inputs (V3IN, V4IN and V5IN) are monitored using externally adjustable threshold (600 mV internal reference) to meet specific level requirements.

If any of the five monitored voltages drops below its factory-trimmed or adjustable thresholds, or if the MR is asserted to logic low, the reset output RST is asserted (driven low). Once asserted, RST is maintained Low for a minimum delay period (trec) after ALL monitored supplies rise above their respective thresholds and MR returns to High. Reset output logic state is valid for VCC greater than 0.8 V.

Digi-Key Part Number
Mfg. Part Number
Voltages Monitored
Operating Temperature
-40° C ~ 85° C
STM6904 Datasheet
-40° C ~ 85° C
STM6905 Datasheet

  • Primary supply (VCC) monitor (factory-programmed) fixed 3.078 V to 2.866 V (6905) or 2.188 V (6904)
  • Second fixed (V2IN) monitor (factory programmed) fixed 2.333 V to 1.050 V (6905) or 1.110 (6904)
  • Three more adjustable supply monitor inputs
  • Accuracy ± 1.8% (± 1% at 25°C)
  • Low supply current of 12 µA (typ)
  • Standby mode active low
  • Operating temperature: -40°C to 85°C
  • Set-top boxes
  • Multi-voltage systems
  • Cable/satellite applications
  • Computer systems
  • Data storage equipment
RoHS Compliant