STMicroelectronics STM6904TGEDS6F

Overview

STM6904TGEDS6F from STMicroelectronics is a quad ultralow-voltage supervisor IC for multi-rail power monitoring in embedded systems, featuring four independent supply monitors (VCC at 3.078 V, V2IN at 1.110 V, and two externally adjustable inputs), ±1.8% threshold accuracy across –40 to 85 °C, open-drain RST output guaranteed down to VCC ≥ 0.8 V, and user-selectable 210 ms reset timeout via TRSEL pin. It serves as a system-level reset controller in set-top boxes and multi-voltage industrial equipment.

For engineers reviewing the STM6904TGEDS6F datasheet, STM6904TGEDS6F pinout, STM6904TGEDS6F application, or STM6904TGEDS6F equivalent, key selection criteria include fixed dual-threshold configuration (3.078 V / 1.110 V), 8-pin MSOP/TSSOP package compatibility, manual push-button reset support with internal 10 kΩ pull-up, and operation down to 0.8 V supply voltage - critical for low-power brownout detection and battery-backed systems.

Technical Context

The device integrates four independent voltage comparators: two factory-trimmed fixed-threshold monitors (VCC and V2IN) and two adjustable inputs (V3IN/V4IN) referenced to a 0.600 V internal bandgap. All comparators drive a single open-drain RST output that asserts low if any monitored rail falls below its threshold or MR is pulled low.

Reset assertion is synchronized with power-on sequencing via tREC delay (210 ms when TRSEL = VSS), and RST remains active until all monitored supplies recover above their thresholds and MR returns high. The 12 µA typical supply current and 0.8–5.5 V operating range enable use in ultra-low-power applications without compromising reset reliability.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (TSSOP8), 3 mm × 3 mm, RoHS-compliant green package (ECOPACK®), 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 STM6904TGEDS6F, TPS3307-33D offers tighter initial threshold tolerance (±0.5%) but lacks two adjustable inputs and quad monitoring, while MAX6816EUS+ addresses only manual reset timing - neither matches the integrated quad-monitoring, adjustable-rail, and low-voltage operation of the STM6904TGEDS6F.

Availability

STM6904TGEDS6F is available at Aetrix Electronics and suitable for set-top boxes, multi-voltage industrial controllers, cable/satellite modems, and data storage equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STM6904TGEDS6F 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM6904 belongs to ST's precision power monitoring product line, engineered specifically for robust multi-rail supervision in cost-sensitive, space-constrained embedded systems where reliability across wide temperature and voltage ranges is mandatory.

FAQ

What is the minimum VCC voltage required for STM6904TGEDS6F to assert RST reliably?

The device guarantees RST output functionality down to VCC = 0.8 V. Below this, internal circuitry cannot maintain comparator bias or output driver state. At 0.8 V, RST remains asserted if any monitored rail drops below its threshold or MR is activated, satisfying fail-safe reset requirements during deep brownout events.

Can V3IN and V4IN be used to monitor voltages below 0.6 V?

No. V3IN and V4IN compare the applied voltage against a fixed 0.600 V internal reference. If the input voltage falls below ~0.589 V (minimum spec), the comparator output changes state - but the trip point cannot be set lower than the reference itself. These pins are intended for monitoring rails ≥0.6 V using resistor dividers to scale higher voltages down.

How does TRSEL pin selection affect reset timing in real-world applications?

When TRSEL is tied to VSS, tREC is 210 ms (min 140 ms, max 280 ms); when tied to VCC, it is 420 ms. This allows designers to match reset hold time to specific microcontroller or FPGA power-up requirements - e.g., 210 ms suffices for most ARM Cortex-M MCUs, while 420 ms accommodates slower-configurable FPGAs or legacy processors.

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

Yes. RST is open-drain with no internal pull-up. An external resistor (typically 10 kΩ to VCC) is mandatory to establish a defined high state when reset is deasserted. Without it, RST floats undefined, risking spurious system resets or failure to release reset after power stabilization.