STMicroelectronics STM6717SYWY6F

Overview

STM6717SYWY6F 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 4.63 V threshold) and VCC2 (3.08 V threshold), operating from –40 °C to +85 °C with 11 µA typical supply current and 13.2 ms power-up reset delay - used in set-top boxes and portable battery-powered systems.

For engineers reviewing the STM6717SYWY6F datasheet, STM6717SYWY6F pinout, STM6717SYWY6F application, or STM6717SYWY6F equivalent, key selection considerations include dual-supply monitoring capability, SOT23-5 open-drain reset interface, manual reset input with internal 50 kΩ pull-up, guaranteed RST state down to VCC ≥ 0.8 V, and industrial temperature range compliance.

Technical Context

The device implements independent voltage comparators for VCC1 and VCC2 against factory-programmed thresholds, with logic-gated reset assertion that holds RST low until both supplies exceed their thresholds and MR returns high. Reset assertion is synchronized to a fixed trec delay timer (13.2 ms typ) after all conditions are satisfied.

It features an active-low MR input with internal 50 kΩ pull-up to VCC1, supporting direct connection to momentary switches or TTL/CMOS logic; RST output is open-drain requiring external pull-up (e.g., 10 kΩ to VCC1), enabling bi-directional processor reset interface compatibility without contention.

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, STM6717SYWY6F uniquely delivers verified dual-supply monitoring with factory-trimmed thresholds, open-drain RST for bidirectional compatibility, and guaranteed operation down to 0.8 V - making it irreplaceable in multi-rail embedded systems requiring robust power-good sequencing.

Availability

STM6717SYWY6F is available at Aetrix Electronics and suitable for set-top boxes, portable medical monitors, industrial gateways, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM6717SYWY6F 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 sensing solutions for industrial, automotive, and consumer markets.

This device belongs to the STM67xx ultra-low-voltage supervisor family, engineered specifically for dual- and triple-rail power monitoring in space-constrained, battery-sensitive applications such as STBs and portable electronics.

FAQ

What is the function of the MR pin and how should it be connected?

The MR pin is an active-low manual reset input with an internal 50 kΩ pull-up resistor to VCC1. It can be driven by a momentary switch to VSS, TTL/CMOS logic, or open-drain outputs. No external pull-up is required. For noise immunity in long-cable or noisy environments, add a 0.1 µF capacitor from MR to VSS. Leaving MR unconnected is acceptable due to the internal pull-up.

Why does STM6717SYWY6F use an open-drain RST output instead of push-pull?

The open-drain RST output enables direct interfacing with processors that have bidirectional reset I/O pins, avoiding logic contention. It requires an external pull-up resistor (typically 10 kΩ to VCC1) to define the high state, allowing flexible voltage translation and shared reset bus configurations - a critical feature for multi-vendor SoC integration in consumer electronics.

Can STM6717SYWY6F monitor a 1.8 V supply?

No - STM6717SYWY6F monitors VCC1 at a fixed 4.63 V threshold and VCC2 at a fixed 3.08 V threshold. Neither threshold is adjustable, and no RSTIN pin is present on this variant (SOT23-5, STM6717). To supervise 1.8 V, select STM6719/20/79/80 variants with RSTIN and 0.626 V internal reference for external resistor-divider configuration.

What is the minimum supply voltage required for STM6717SYWY6F to assert a valid RST state?

The device guarantees correct RST logic state (high-impedance or driven low as appropriate) when VCC1 or VCC2 is ≥ 0.8 V. Below this, RST behavior is undefined. This specification ensures reliable reset assertion during brownout recovery and supports operation with partially discharged batteries or low-dropout regulators near dropout.