STMicroelectronics STM6719SYWB6F

Overview

STM6719SYWB6F from STMicroelectronics is a dual-supply ultra-low-voltage supervisor IC with push-button reset, open-drain RST output, and adjustable third-supply monitoring via RSTIN pin. It monitors VCC1 (factory-trimmed threshold: 2.93 V) and VCC2 (factory-trimmed threshold: 1.58 V), guarantees RST state down to VCC ≥ 0.8 V, and delivers 13.2 ms / 210 ms / 900 ms selectable power-up reset delay - used in battery-powered networking equipment for reliable cold-start sequencing.

For engineers reviewing the STM6719SYWB6F datasheet, STM6719SYWB6F pinout, STM6719SYWB6F application, or STM6719SYWB6F equivalent, key selection criteria include its SOT23-6 open-drain RST output, dual fixed-threshold monitoring with external RSTIN flexibility, manual reset with no external debounce, and guaranteed operation at VCC1/VCC2 ≥ 0.8 V for low-power brownout resilience.

Technical Context

The device implements three independent voltage comparators: one for VCC1 (4.63 V–1.58 V factory-programmed), one for VCC2 (3.08 V–0.79 V), and one for RSTIN referenced to a 0.626 V internal bandgap. Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low.

Its logic diagram (Figure 3) shows an OR-combined fault detection path feeding a trec timer that holds RST low until all supplies recover and MR returns high. The RST output is open-drain, requiring an external pull-up to VCC1, and remains valid over –40 °C to +85 °C industrial temperature range.

Key Specifications

Pinout & Package

SOT23-6 (WB) package: 6-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.45 mm height, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisor applications.

Compared with TPS3808G18DBVR and MAX6326UT29D3+, STM6719SYWB6F uniquely integrates dual fixed-threshold monitoring, RSTIN-based third-supply adaptability, and robust MR handling - reducing component count and enabling compact, multi-rail supervision in space-constrained designs.

Availability

STM6719SYWB6F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, set-top box power sequencing, and wireless gateway baseband processors requiring stable component supply across extended temperature and long product lifecycles.

Supply support for STM6719SYWB6F 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, delivering automotive, industrial, and power management solutions with emphasis on reliability and energy efficiency.

STM67xx is ST's ultra-low-voltage supervisor product line designed specifically for battery-powered and multi-rail embedded systems requiring deterministic reset behavior under brownout, cold-start, and manual intervention conditions.

FAQ

What is the function of the RSTIN pin on STM6719SYWB6F?

The RSTIN pin is a high-impedance input referenced to an internal 0.626 V bandgap voltage. When an external resistor divider applies a voltage below 0.626 V to RSTIN, the device asserts RST. This enables precise supervision of arbitrary supply voltages (e.g., 1.2 V, 0.9 V) without additional components - confirmed in Section 1.1.7 and Figure 10 of the datasheet.

Does STM6719SYWB6F require an external pull-up resistor on the RST pin?

Yes - the RST pin is open-drain and requires an external pull-up resistor to VCC1. A 10 kΩ resistor is recommended per Section 1.1.2 and Figure 10. This configuration enables wired-OR reset signaling and compatibility with processors featuring bi-directional reset I/O pins, unlike push-pull variants in the same family.

Can STM6719SYWB6F monitor three independent supply rails simultaneously?

Yes - it monitors VCC1 and VCC2 at factory-trimmed thresholds (2.93 V and 1.58 V), and a third rail via RSTIN using an external resistor divider referenced to the 0.626 V internal comparator. All three faults independently trigger RST assertion, as verified in the block diagram (Figure 9) and description (Section 1).

What is the minimum operating voltage required for STM6719SYWB6F to guarantee correct RST output state?

The device guarantees correct RST logic state when VCC1 or VCC2 is ≥ 0.8 V, per Section 1 and Table 6 DC characteristics. This ensures reliable reset assertion during deep brownout events - critical for fail-safe operation in battery-backed systems where supply may dip below nominal levels before complete collapse.