STMicroelectronics STM6719TWWB6F

Overview

STM6719TWWB6F 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 typical power-on reset delay - used in battery-powered networking equipment for reliable cold-start sequencing.

For engineers reviewing the STM6719TWWB6F datasheet, STM6719TWWB6F pinout, STM6719TWWB6F application, or STM6719TWWB6F equivalent, key selection criteria include its SOT23-6 open-drain RST output, dual fixed-threshold voltage monitoring, RSTIN-based tertiary supply adaptability, and industrial-grade –40 °C to +85 °C operation with 11 µA typical supply current.

Technical Context

The device implements independent comparator-based monitoring of VCC1 and VCC2 against factory-programmed thresholds, plus a high-impedance RSTIN input referenced to an internal 0.626 V bandgap. Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low.

Reset remains active for trec (13.2/210/900 ms typ) after all supplies recover and MR returns high. The open-drain RST output requires external pull-up to VCC1 and is guaranteed functional at VCC1 ≥ 0.8 V - enabling valid reset signaling during brown-out conditions.

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 MAX6816EUT+T, STM6719TWWB6F uniquely integrates dual fixed-threshold voltage supervision, adjustable third-supply monitoring, and open-drain reset in one SOT23-6 package - eliminating board space and BOM count required by multi-component solutions.

Availability

STM6719TWWB6F is available at Aetrix Electronics and suitable for portable network routers, industrial PLC I/O modules, battery-powered IoT gateways, and set-top box power management requiring stable component supply across extended temperature and long product lifecycles.

Supply support for STM6719TWWB6F 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.

STM67xx is ST's ultra-low-power voltage supervisor product line, engineered specifically for reliable power-on reset and brown-out detection in space-constrained, battery-sensitive, and thermally demanding embedded systems.

FAQ

What is the function of the RSTIN pin on STM6719TWWB6F?

RSTIN is a high-impedance input that connects to an external resistor divider to set a custom reset threshold for a third supply rail. Internally referenced to a stable 0.626 V bandgap voltage, it enables precise monitoring of non-standard voltages like 1.2 V or 0.9 V without additional ICs - confirmed in Section 1.1.7 and Figure 10 of the datasheet.

Does STM6719TWWB6F support push-pull or open-drain RST output?

STM6719TWWB6F features an active-low open-drain RST output, as specified in Table 1 and Section 1.1.2. It requires an external pull-up resistor (typically 10 kΩ to VCC1) and is designed to interface safely with bi-directional processor reset pins - unlike push-pull variants (e.g., STM6718) which drive high actively.

Can STM6719TWWB6F monitor three independent supply rails simultaneously?

Yes: VCC1 and VCC2 are independently monitored at factory-trimmed thresholds (2.93 V and 1.58 V), while RSTIN enables adjustable monitoring of a third rail using an external resistor divider. All three conditions - VCC1 drop, VCC2 drop, or RSTIN voltage falling below 0.626 V - trigger RST assertion, as detailed in the block diagram (Figure 9) and Description section.

What is the minimum VCC voltage required for valid RST output operation?

The device guarantees correct RST logic state when VCC1 or VCC2 ≥ 0.8 V, per Section 1 of the datasheet. This ensures deterministic reset behavior during severe brown-out events where supply rails dip below nominal values but remain above 0.8 V - critical for fail-safe recovery in battery-backed systems.