STMicroelectronics STM6904PWEDS6F

Overview

STM6904PWEDS6F from STMicroelectronics is a quad ultralow-voltage supervisor IC for multi-rail power monitoring in industrial embedded systems, featuring factory-trimmed VCC reset threshold of 2.866 V and V2IN threshold of 1.683 V, 210 ms reset timeout (TRSEL = VSS), ±1.8% voltage accuracy across –40 to 85 °C, and open-drain RST output guaranteed down to VCC ≥ 0.8 V - deployed in set-top boxes and multi-voltage data storage equipment.

For engineers reviewing the STM6904PWEDS6F datasheet, STM6904PWEDS6F pinout, STM6904PWEDS6F application, or STM6904PWEDS6F equivalent, this page delivers verified pin functions, exact reset threshold tolerances, tREC timing configuration logic, adjustable V3IN/V4IN design methodology using 0.6 V internal reference, and real-world use cases in cable/satellite and computer systems requiring stable four-rail supervision.

Technical Context

The STM6904PWEDS6F integrates four independent voltage comparators: two with factory-programmed thresholds (VCC at 2.866 V, V2IN at 1.683 V) and two with externally adjustable trip points referenced to a 0.600 V internal bandgap. It asserts active-low RST when any monitored rail falls below its threshold or MR is pulled low.

Reset assertion is sustained for a minimum tREC delay (210 ms, selected via TRSEL = VSS) after all supplies recover and MR returns high; RST remains valid even at VCC as low as 0.8 V, enabling reliable reset generation during brownout conditions in battery-backed or low-VCC systems.

Key Specifications

Pinout & Package

Package: MSOP-8 (TSSOP-8), 3 mm × 3 mm, RoHS-compliant ECOPACK® green package, industrial temperature range (–40 to 85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage supervisor applications.

Compared with MAX6812HEUS+T and TPS3808G33DBVR, the STM6904PWEDS6F uniquely delivers factory-trimmed dual fixed thresholds plus two fully adjustable inputs in one MSOP-8 package - enabling true four-rail supervision without external components or timing compromises.

Availability

STM6904PWEDS6F is available at Aetrix Electronics and suitable for set-top boxes, multi-voltage systems, cable/satellite applications, computer systems, and data storage equipment requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for STM6904PWEDS6F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STM6904 belongs to ST's precision voltage supervisor product line, engineered specifically for robust, low-power, multi-rail power monitoring in space-constrained industrial and communications equipment.

FAQ

What is the exact reset threshold tolerance for VCC and V2IN on STM6904PWEDS6F?

The VCC reset threshold is 2.866 V with ±1.8% accuracy over –40 to 85 °C (±1% at 25 °C), and V2IN is 1.683 V with identical tolerance. These values are factory-trimmed and documented in Table 4 of ST's Doc ID 14289 Rev 3, confirmed by DC parameter testing at min/max temperature extremes.

How do I configure V3IN and V4IN for a 2.5 V supply monitoring threshold?

Use the formula VTRIP = 0.6 V × (R1 + R2)/R2, where VTRIP = 2.5 V. Solving yields R1/R2 ≈ 3.17. Select standard resistors (e.g., R1 = 316 kΩ, R2 = 100 kΩ) to achieve 2.502 V trip point. The 0.6 V internal reference has ±11 mV tolerance, so final accuracy depends on resistor tolerance and layout.

Can STM6904PWEDS6F operate reliably at VCC = 0.9 V?

Yes - RST output is guaranteed functional down to VCC ≥ 0.8 V per datasheet Section 1 and Table 4 (VOL test condition). At 0.9 V, the open-drain RST can sink ≥1 µA while maintaining VOL ≤ 0.3 V, enabling compatibility with low-voltage microcontrollers like ARM Cortex-M0+ running at 0.9 V.

Is TRSEL required to be hard-wired, or can it be driven dynamically?

TRSEL must be hard-wired to either VSS (for 210 ms tREC) or VCC (for 420 ms tREC) - floating or actively driven states are prohibited per datasheet Section 2.7 and Figure 4. Dynamic switching risks metastability and undefined tREC behavior; no timing specification is provided for transitions.