STMicroelectronics STM6905SYEDS6F

Overview

STM6905SYEDS6F from STMicroelectronics is a quintuple ultralow-voltage supervisor IC with push-button reset, designed for multi-rail power monitoring in industrial embedded systems. It monitors five supply rails-two factory-trimmed (VCC = 2.955 V, V2IN = 2.188 V), three externally adjustable via 600 mV internal reference-and asserts an open-drain RST output when any falls below threshold. Guaranteed operation down to VCC = 0.8 V, 210 ms power-on reset delay, and 12 µA typical supply current enable use in low-power set-top boxes and data storage equipment.

For engineers reviewing the STM6905SYEDS6F datasheet, STM6905SYEDS6F pinout, STM6905SYEDS6F application, or STM6905SYEDS6F equivalent, key selection criteria include fixed dual-threshold accuracy (±1.8 % over –40 °C to +85 °C), MR input with 10 kΩ internal pull-up, RST validity at VCC ≥ 0.8 V, and compatibility with TSSOP8 footprint for space-constrained PCB layouts.

Technical Context

The STM6905SYEDS6F implements five independent voltage comparators: two with factory-programmed thresholds (VRST1 = 2.955 V, VRST2 = 2.188 V) and three using an internal 600 mV reference with external resistor dividers to set trip points. All comparators feed into a logic OR structure that triggers RST assertion on any undervoltage event or MR low pulse.

Its power-on reset circuit guarantees RST remains asserted for 210 ms (typ) after all monitored supplies exceed their thresholds and MR returns high. The open-drain RST output supports flexible pull-up configuration and interfaces directly with microcontroller reset inputs requiring active-low, level-sensitive assertion.

Key Specifications

Pinout & Package

STM6905SYEDS6F is housed in an 8-pin MSOP/TSSOP package (3 mm × 3 mm, DS suffix), RoHS-compliant and ECOPACK®-qualified for industrial temperature range (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM6904SYEDS6F and TPS3808G33DBVR, the STM6905SYEDS6F uniquely delivers five-rail supervision with factory-trimmed dual thresholds, adjustable inputs, and integrated MR functionality in one TSSOP8 package-reducing component count, layout complexity, and qualification effort for multi-voltage industrial designs.

Availability

STM6905SYEDS6F is available at Aetrix Electronics and suitable for set-top boxes, multi-voltage industrial controllers, and data storage equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for STM6905SYEDS6F 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, specializing in automotive, industrial, and power management ICs with broad manufacturing and R&D infrastructure.

The STM6905 belongs to ST's precision voltage supervisor product line, engineered specifically for robust, low-power, multi-rail power monitoring in industrial and consumer electronics where reliability under varying thermal and supply conditions is critical.

FAQ

What is the exact reset threshold voltage for VCC and V2IN on STM6905SYEDS6F?

The STM6905SYEDS6F has factory-programmed thresholds of 2.955 V (S-grade) for VCC and 2.188 V (Y-grade) for V2IN, both specified at 25 °C with ±1.8 % accuracy across –40 °C to +85 °C. These values are laser-trimmed during production and documented in Table 4 of the datasheet (DocID14290 Rev 4).

Can V3IN, V4IN, and V5IN monitor voltages higher than 5.5 V?

No. While V3IN–V5IN are high-impedance inputs referenced to a 600 mV internal VREF, their absolute maximum input voltage is limited to VCC + 0.3 V per Table 3. Since VCC max is 5.5 V, these pins cannot safely monitor rails exceeding ~5.8 V without external attenuation or level-shifting circuitry.

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

Yes. The RST pin is open-drain and requires an external pull-up resistor to a valid supply rail (typically VCC). ST recommends a 10 kΩ resistor for most applications; the internal 10 kΩ pull-up on MR does not apply to RST. Without this pull-up, RST cannot assert a valid high-impedance state.

Does the 210 ms tREC delay apply only on power-up, or also after MR assertion?

The 210 ms tREC delay applies both on initial power-up and after MR is released. Per Section 3.2 and Figure 5, RST remains low for the full tREC period after *all* monitored supplies rise above their thresholds *and* MR transitions from low to high - ensuring synchronized release regardless of trigger source.