STM6779SWB6F

The STM6717/18/19/20 and STM6777/78/79/80 supervisors are a family of low-voltage/lowsupply current processor (micro or DSP) supervisors, designed to monitor two (or three) system power supply voltages. They are targeted at applications such as set-top boxes (STBs), portable, battery-powered systems, networking, and communication systems. All device options have a push-button-type manual reset input (MR). The STM6777/78/79/80 also includes an option which enables the user to delay the start of the manual reset process from 6 µs (MRC pin left open) or more with external capacitor. Two of the three supplies monitored (VCC1 and VCC2) have fixed (customer-selectable, factory-trimmed) thresholds (VRST1 and VRST2). The third voltage is monitored using an externally adjustable RSTIN threshold (0.626 V internal reference). If any of the three monitored voltages drop below its factory-trimmed or adjustable thresholds, or if MR is asserted to logic low.

Applications

• set-top boxes (STBs)
• portable, battery-powered systems
• networking
• communication systems

Key features

• SOT23-5 (WY)
• Primary supply (VCC1) monitor
• Fixed (factory-programmed) reset thresholds: 4.63 V to 1.58 V
• Secondary supply (VCC2) monitor (STM6717/18/19/20/77/78)
• Fixed (factory-programmed) reset thresholds: 3.08 V to 0.79 V
• Tertiary supply monitor (using externally adjustable RSTIN): 0.626 V internal reference
• RST outputs (push-pull or open drain); state guaranteed if VCC1 or VCC2 ≥ 0.8 V
• Reset delay time (trec) on power-up: 13.2 ms, 210 ms, 900 ms (typ)
• Manual reset input (MR)
• Optional delayed manual reset input (MRC) with external capacitor (STM6777/78/79/80)
• Low supply current - 11 μA (typ), VCC1 = VCC2 = 3.6 V
• Operating temperature: -40 °C to 85 °C (industrial grade)
• SOT23-6 (WB)