STMicroelectronics STM6717TWWY6F

Overview

STM6717TWWY6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset, monitoring VCC1 (primary supply) and VCC2 (secondary supply), featuring factory-programmed reset thresholds of 4.63 V and 3.08 V respectively, 13.2 ms power-on reset delay, open-drain active-low RST output, and operation down to 0.8 V supply - deployed in set-top boxes and portable battery-powered systems.

For engineers reviewing the STM6717TWWY6F datasheet, STM6717TWWY6F pinout, STM6717TWWY6F application, or STM6717TWWY6F equivalent, key selection criteria include dual-supply monitoring capability, guaranteed RST state at ≥0.8 V, SOT23-5 package compatibility, manual reset timing behavior, and open-drain output drive requirements for bi-directional processor reset interfaces.

Technical Context

The device implements independent voltage comparators for VCC1 and VCC2 against fixed internal 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 supply stabilization via an internal timer generating trec (13.2 ms typ).

Its open-drain RST output requires an external pull-up resistor (e.g., 10 kΩ to VCC1) and supports direct interface to processors with bi-directional reset I/O pins; internal 50 kΩ pull-up on MR enables momentary switch connection without external biasing.

Key Specifications

Pinout & Package

SOT23-5 (WY) package: 5-pin compact surface-mount outline with exposed pad not present; compatible with standard reflow profiles (peak 260 °C, ≤30 s above 255 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G12DBVR and MAX6326UT29D3+, STM6717TWWY6F uniquely delivers integrated dual-rail monitoring in SOT23-5 with factory-trimmed thresholds, eliminating external resistive dividers and calibration effort required by single-rail alternatives.

Availability

STM6717TWWY6F is available at Aetrix Electronics and suitable for set-top box power sequencing, portable medical monitors, industrial Ethernet gateways, and wireless sensor nodes requiring stable component supply across extended temperature and low-quiescent-current operation.

Supply support for STM6717TWWY6F 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, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.

The STM67xx family targets low-voltage, low-power system supervision in space-constrained portable and embedded applications - emphasizing guaranteed reset behavior at sub-1 V supply and minimal external component count.

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 should be connected directly to VSS via a normally open momentary switch; no external resistor or capacitor is required for basic operation. In noisy environments or with long PCB traces, a 0.1 µF capacitor from MR to VSS improves noise immunity without affecting reset timing.

Why does STM6717TWWY6F use an open-drain RST output instead of push-pull?

The open-drain RST output enables direct interfacing with microprocessors that feature bi-directional reset I/O pins, avoiding logic contention. It requires an external pull-up resistor (typically 10 kΩ to VCC1) to establish a valid high level, allowing flexible voltage translation and safe sharing of the reset bus among multiple devices without driver conflicts.

Can STM6717TWWY6F monitor a 1.2 V supply rail?

No - STM6717TWWY6F monitors VCC1 at 4.63 V and VCC2 at 3.08 V, both factory-programmed and non-adjustable. To supervise a 1.2 V rail, a different variant (e.g., STM6719/20 with RSTIN pin and 0.626 V internal reference) or external resistor divider would be required; this part lacks adjustable threshold capability.

Is the 13.2 ms reset delay (trec) programmable or fixed?

The 13.2 ms reset delay is fixed and factory-trimmed - it is not user-programmable or externally adjustable. This value applies specifically to the STM6717/18 variants; other members of the STM67xx family offer 210 ms or 900 ms delays, but those are implemented in different part numbers, not configurable on STM6717TWWY6F.