STMicroelectronics STM6717SDWY6F

Overview

STM6717SDWY6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset and open-drain active-low RST output, monitoring VCC1 (factory-trimmed 1.58–4.63 V threshold) and VCC2 (0.79–3.08 V), operating from –40 °C to +85 °C with 11 µA typical supply current. It supports manual reset via MR pin with internal 50 kΩ pull-up and guarantees valid RST state when VCC1 or VCC2 ≥ 0.8 V - used in battery-powered set-top boxes and portable communication systems.

For engineers reviewing the STM6717SDWY6F datasheet, STM6717SDWY6F pinout, STM6717SDWY6F application, or STM6717SDWY6F equivalent, key selection criteria include dual-supply monitoring capability, open-drain RST compatibility with bi-directional processor reset pins, factory-programmed reset thresholds, MR debounce-free operation, and SOT23-5 package suitability for space-constrained embedded power management.

Technical Context

This supervisor implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds, and asserts RST low upon any monitored supply drop below its threshold or MR assertion. The open-drain RST output requires an external pull-up to VCC1 (typically 10 kΩ) and remains asserted for trec (13.2/210/900 ms typ) after all supplies recover and MR returns high.

It features guaranteed reset-state validity down to VCC1/VCC2 = 0.8 V, enabling robust power-on sequencing in low-voltage microprocessor systems. No RSTIN or MRC functionality is present - confirming it as the base dual-monitor variant in the STM67xx family with fixed thresholds only and no adjustable third supply input or delayed manual reset.

Key Specifications

Pinout & Package

SOT23-5 (WY) package: 5-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.45 mm height, JEDEC MO-178 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, STM6717SDWY6F uniquely delivers integrated dual-rail voltage supervision with factory-trimmed thresholds and open-drain RST in a 5-pin SOT23 - eliminating external comparators, references, and timing components required by alternatives.

Availability

STM6717SDWY6F is available at Aetrix Electronics and suitable for set-top box power sequencing, portable medical monitors, and industrial Ethernet gateways requiring stable component supply, long-lifecycle support, and industrial-temperature qualification.

Supply support for STM6717SDWY6F 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 dual/triple voltage supervisor product line, engineered specifically for reliable power-on reset and brown-out protection in battery-sensitive and multi-rail embedded systems.

FAQ

What is the function of the MR pin, and does it require external components?

The MR pin is an active-low manual reset input with an internal 50 kΩ pull-up resistor to VCC1. It requires no external pull-up or debounce circuitry - a normally open momentary switch connected directly between MR and VSS is sufficient. Driving MR low asserts RST, which remains low for the full trec delay after MR returns high, ensuring clean processor reset initiation.

Can STM6717SDWY6F monitor a third supply voltage?

No. STM6717SDWY6F is a dual-supply supervisor supporting only VCC1 and VCC2 monitoring. Third-supply monitoring via RSTIN is exclusive to variants STM6719/20/79/80 (SOT23-6). This part lacks RSTIN and MRC pins, confirming its role as the base dual-monitor configuration in the family.

What is the minimum supply voltage required for RST output validity?

RST output state is guaranteed when VCC1 or VCC2 ≥ 0.8 V. Below this, the device may not maintain correct logic levels on RST. This specification ensures reliable reset assertion during brown-out conditions common in battery-discharge profiles and unregulated power supplies.

How does the open-drain RST output interface with a processor having a bi-directional reset pin?

The open-drain RST output connects directly to bi-directional processor reset pins without contention. A 4.7 kΩ series resistor between RST and the processor pin prevents logic conflict during processor-driven reset assertion, as specified in ST's Figure 11. No level-shifting or additional buffering is required.