TPS3306-15DG4

Supervisors Overview

The TPS3306-15DG4 is a dual-processor supervisory circuit manufactured by Texas Instruments, designed for systems requiring independent monitoring of two power rails. It operates within a supply voltage range of 2.7 V to 6 V and features fixed threshold voltages of 1.5 V and 3.3 V for its SENSE inputs. The device integrates an active-low open-drain reset output with a typical 100 ms delay, a watchdog timer with a 0.8 s timeout triggered by periodic WDI transitions, and a separate power-fail comparator. It is available in an 8-pin VSSOP package and supports an operating temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Dual-channel voltage supervision with dedicated thresholds for 1.5 V and 3.3 V rails
• Integrated watchdog timer with programmable timeout via periodic input triggering
• Independent power-fail comparator providing early warning before reset assertion
• Active-low open-drain reset output with built-in power-on reset delay

Supervisors Applications

• Dual-voltage DSP and microprocessor system initialization
• Portable battery-powered equipment requiring low quiescent current
• Embedded control systems needing reliable power-fail detection

Supervisors Procurement Notes

Verify the specific suffix 'DG4' indicates lead-free packaging compliant with RoHS standards. Confirm the package type is VSSOP-8 and that the threshold settings match the 1.5 V/3.3 V configuration. Ensure the design accounts for the open-drain nature of the RESET and PFO outputs, requiring appropriate pull-up resistors for proper logic level translation in the target application circuit.

Supervisors Selection Notes

Select this component when a system requires simultaneous monitoring of two distinct voltage levels without adjustable thresholds. The fixed 1.5 V and 3.3 V settings suit standard logic and core voltage architectures. Consider the low 15 µA typical supply current for battery-sensitive designs. Verify that the 0.8 s watchdog timeout and 100 ms reset delay align with the processor startup requirements and software initialization timelines.

Supervisors Part Context

The TPS3306 belongs to Texas Instruments' family of dual-processor supervisory circuits. It complements other variants like the TPS3306-18 or TPS3306-25, which offer different threshold combinations such as 1.8 V/3.3 V or 2.5 V/3.3 V. All members share the same functional architecture, including the watchdog and power-fail features, differing primarily in their internal reference voltages for the monitored rails.

Supervisors Replacement Considerations

Direct substitutes include TPS3306-18DG4 (1.8V/3.3V thresholds) and TPS3306-25DG4 (2.5V/3.3V thresholds) if voltage levels differ. For single-supervisor needs, consider TPS3304. Triple-monitor applications may use TPS3307.