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STM6904：Quad, ultralow voltage supervisor with push-button reset

The STM6904 supervisor is a low voltage/low supply current processor supervisor, designed to monitor up to four system power supply voltages. This device is targeted at applications such as “Set-Top Boxes” (STBs), portable, battery-powered systems, networking and communication systems.

The device supports a push-button type manual reset input (MR). Two of the four supply monitors (V_CCand V2IN) have fixed (customer-selectable, factory-trimmed) thresholds (V_RST1and V_RST2). The other two voltage monitor inputs (V3IN and V4IN) are monitored using externally adjustable threshold (0.600 V internal reference) to meet specific level requirements.

If any of the four monitored voltages drops below its factory-trimmed or adjustable thresholds, or if the MRis asserted to logic low, the reset output RSTis asserted (driven low). Once asserted, RST is maintained low for a minimum delay period (t_REC) after ALL monitored supplies rise above their respective thresholds and MR returns to high. This device is in the correct reset output logic state when V_CCgreater than 0.8 V.

The STM6904 is available in a standard 8-lead MSOP (TSSOP) package.

Key Features

• Quad voltage monitoring
• Accurate ±1.8% across temperature voltage threshold (±1% at 25 °C)
• Primary supply (VCC ) monitor. Fixed (factory -programmed) reset thresholds: 3.078 to 2.188 V
• Second fixed (V2IN) monitor. Fixed (factory-programmed) reset thresholds: 2.333 to 1.110 V
• Two additional adjustable supply monitor inputs (externally adjustable)
• 0.6 V internal reference
• RST output (open drain)
• Output guaranteed for VCC ≥ 0.8 V
• Reset delay time (tREC ) pin selectable
• Manual reset input (MR )
• Low supply current of 12 μA (typ)
• Power supply voltage 0.8 to 5.5 V
• RoHS compliant (green package)
• 8-pin MSOP/TSSOP
• Operating temperature: –40 to 85 °C (industrial grade)

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