STMicroelectronics STM6905TGEDS6F

Overview

STM6905TGEDS6F from STMicroelectronics is a quintuple ultralow-voltage supervisor IC with push-button reset functionality, designed for multi-rail power monitoring in embedded systems. It monitors one primary supply (VCC) at 3.078 V, a second fixed supply (V2IN) at 1.110 V, and three externally adjustable supplies using a 600 mV internal reference; features ±1.8 % threshold accuracy over –40 °C to +85 °C, 210 ms reset delay (tREC), and open-drain RST output guaranteed down to VCC = 0.8 V. Used in set-top boxes and multi-voltage industrial systems.

For engineers reviewing the STM6905TGEDS6F datasheet, STM6905TGEDS6F pinout, STM6905TGEDS6F application, or STM6905TGEDS6F equivalent, key selection considerations include factory-trimmed dual fixed thresholds (3.078 V / 1.110 V), adjustable triple-monitor capability via resistor dividers, MR input with 10 kΩ internal pull-up, 12 µA typical supply current, and MSOP8/TSSOP8 packaging compatible with space-constrained PCB layouts.

Technical Context

The STM6905TGEDS6F implements five independent voltage comparators: two with factory-programmed thresholds (VCC = 3.078 V, V2IN = 1.110 V) and three with user-adjustable trip points referenced to a 600 mV internal bandgap. All comparators feed into a logic OR structure that asserts the open-drain RST output when any monitored voltage falls below its threshold or when MR is pulled low.

Reset assertion is synchronized with a 210 ms power-on reset timer (tREC), ensuring stable deassertion only after all five inputs exceed their respective thresholds and MR returns high. The device operates across 0.8 V to 5.5 V supply range, maintains valid RST state down to VCC = 0.8 V, and integrates a 10 kΩ internal pull-up on MR - eliminating external biasing in most push-button implementations.

Key Specifications

Pinout & Package

STM6905TGEDS6F is housed in an 8-pin MSOP (TSSOP8) package, 3 mm × 3 mm body size, 0.65 mm pitch, RoHS-compliant ECOPACK® green package.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quintuple voltage monitoring applications.

Compared with MAX6812HEUS+T and TPS3808G33DBVR, the STM6905TGEDS6F uniquely delivers five-rail supervision in one IC - including two factory-trimmed thresholds, three resistor-adjustable inputs, MR support, and sub-1 V operation - making it the only solution that avoids stacking multiple supervisors while maintaining design margin and layout simplicity.

Availability

STM6905TGEDS6F is available at Aetrix Electronics and suitable for set-top boxes, multi-voltage industrial controllers, and cable/satellite equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for STM6905TGEDS6F 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STM6905 belongs to ST's precision voltage supervisor product line, engineered specifically for reliable multi-rail power integrity monitoring in space-constrained, thermally demanding embedded systems operating across –40 °C to +85 °C.

FAQ

What is the exact reset threshold voltage for V2IN on STM6905TGEDS6F?

The V2IN reset threshold for STM6905TGEDS6F is factory-programmed to 1.110 V (±1.8 % over –40 °C to +85 °C), as confirmed in Table 1 and Table 4 of the official datasheet (DocID14290 Rev 4). This value is laser-trimmed during manufacturing and cannot be modified in-circuit.

Can V3IN, V4IN, and V5IN monitor negative voltages?

No - V3IN, V4IN, and V5IN are designed exclusively for positive-supply monitoring. Their input structure compares the applied voltage against a 600 mV internal reference; applying negative voltage violates absolute maximum ratings (VIO = –0.3 V min) and may cause permanent damage.

Is an external pull-up resistor required on the RST pin?

Yes - RST is an open-drain output and requires an external pull-up resistor to a valid logic rail (typically VCC or another system voltage). While 10 kΩ is recommended, values between 4.7 kΩ and 100 kΩ are acceptable depending on rise time and bus loading requirements.

Does the 210 ms tREC apply to both power-on and brownout recovery?

Yes - the 210 ms reset timeout (tREC) applies whenever RST is asserted, whether during initial power-up or during recovery from a brownout event. RST remains low for the full 210 ms after all five monitored voltages exceed their thresholds and MR returns high.