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STMicroelectronics STM708DS6F
- Part No.:
- STM708DS6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
STM708DS6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,951
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Product details
Overview
STM708DS6F from STMicroelectronics is a 5 V precision voltage supervisor IC with dual active-low reset outputs (RST and RST), power-fail comparator (PFI/PFO), and no watchdog timer. It asserts reset down to VCC = 1.0 V, features 4.25–4.50 V reset threshold, 200 ms typical reset timeout (trec), and operates from –40 °C to 85 °C in industrial applications such as microcontroller-based power management systems.
For engineers reviewing the STM708DS6F datasheet, STM708DS6F pinout, STM708DS6F application, or STM708DS6F equivalent, key selection criteria include guaranteed reset assertion at low VCC, dual complementary reset outputs for bidirectional MCU interfaces, PFI/PFO early power-fail detection, and TSSOP-8 packaging for space-constrained embedded designs.
Technical Context
The STM708DS6F implements a precision bandgap reference and dual comparators: one monitors VCC against a 4.25–4.50 V threshold to control RST/RST, while a second compares PFI to a fixed 1.25 V VPFI reference to drive PFO. Its internal trec generator ensures minimum 200 ms reset pulse width after power-up or MR release.
No watchdog circuitry is present-unlike STM705/706/813L variants-making it suitable for systems requiring only voltage monitoring and manual/power-fail reset signaling. The device uses push-pull outputs on RST, RST, and PFO, with MR featuring an internal 40 kΩ pull-up resistor and noise-immunity support via optional 0.1 µF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 4.5 V to 5.5 V - supports stable 5 V rail supervision without brownout during nominal operation. |
| Reset Threshold (VRST) | 4.25 V to 4.50 V - precise window ensures reliable reset assertion before MCU functional failure. |
| Reset Timeout (trec) | 200 ms (typ) - guarantees sufficient reset hold time for full microprocessor initialization. |
| Supply Current | 40 µA (typ) - ultra-low quiescent current enables use in always-on or battery-backed subsystems. |
| Operating Temperature | –40 °C to +85 °C - industrial-grade thermal range for deployment in harsh ambient environments. |
| Power-Fail Threshold (VPFI) | 1.25 V ±1.5% - independent reference allows configurable undervoltage warning via external divider. |
| Reset Output Drive | Push-pull, guaranteed low to VCC = 1.0 V - ensures valid logic level even during deep brownout. |
Pinout & Package
TSSOP-8 package (3 mm × 3 mm body, 0.65 mm pitch), RoHS-compliant, surface-mountable with exposed pad option not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFO | Power-fail output | Active-low push-pull signal indicating PFI < VPFI; can be tied to MR for automatic power-fail reset. |
| 2 - PFI | Power-fail input | Analog input compared to 1.25 V reference; connect via resistor divider to unregulated supply for early warning. |
| 3 - NC | No connect | Unbonded pin; must remain floating - no internal connection or function. |
| 4 - RST | Active-low reset output | Primary reset signal asserted low when VCC < VRST, MR low, or during power-up; drives standard CMOS loads. |
| 5 - VCC | Supply voltage input | 5 V nominal input; powers all internal circuits and defines reset threshold reference point. |
| 6 - MR | Manual reset input | Active-low input with internal 40 kΩ pull-up; debounced by trec timer - no external RC needed. |
| 7 - RST | Active-high reset output | Complementary to RST; goes high when VCC > VRST and MR high - enables direct interface to bidirectional MCU reset pins. |
| 8 - VSS | Ground reference | System ground return for all internal comparators, timers, and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | RST (active-low) and RST (active-high) eliminate need for external inverters when interfacing to bidirectional MCU reset I/O. |
| Guaranteed reset down to VCC = 1.0 V | Ensures deterministic reset state during severe brownout - critical for data retention and safe shutdown in industrial controllers. |
| Independent power-fail comparator | 1.25 V VPFI reference decoupled from VRST allows separate early-warning threshold setting for regulated/unregulated rails. |
| No watchdog timer | Reduces complexity and eliminates false-trigger risk in systems where software watchdog management is unnecessary or handled externally. |
| Low 40 µA supply current | Minimizes impact on standby power budget - suitable for battery-buffered real-time clocks or always-on monitoring nodes. |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Supervises 5 V microcontroller and isolated communication ICs during AC mains fluctuations and backup battery switchover. IC Role / Device Role / Timing Role: Voltage supervisor providing synchronized reset assertion and power-fail warning to trigger EEPROM save and relay de-energization. Use Value: Dual RST/RST outputs enable clean reset coordination across mixed-signal domains; PFO-driven MR ensures <20 ms response to input collapse. |
Use Scenario: Monitors DC-DC converter output in revenue-grade metering, detecting undervoltage before metrology ADC fails. IC Role / Device Role / Timing Role: Precision VCC monitor with independent PFI threshold set to 4.35 V (via 10:1 divider) for 100 ms advance warning of supply decay. Use Value: 4.25–4.50 V VRST window matches MCU min operating spec; 200 ms trec exceeds flash write cycle duration. |
| Automotive Body Control Module | Medical Infusion Pump Controller |
Use Scenario: Provides fail-safe reset for ARM Cortex-M based BCM during cold-crank (4.2 V dip) and load-dump transients. IC Role / Device Role / Timing Role: Supervisor asserting RST low and RST high simultaneously to initialize CAN transceiver and LIN gateway ICs post-brownout. Use Value: Guaranteed reset down to VCC = 1.0 V prevents latch-up during extended cranking; TSSOP-8 footprint fits tight PCB layouts. |
Use Scenario: Ensures deterministic restart of safety-critical pump motor controller after brief AC dropout or battery swap. IC Role / Device Role / Timing Role: Dual-reset supervisor coordinating MCU, motor driver, and pressure sensor interface initialization within 250 ms. Use Value: Push-pull RST/RST outputs drive heavy capacitive loads without external buffers; 40 µA current supports 10-year battery life in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM706RS6F | Includes watchdog timer (1.6 s timeout); same VRST range and TSSOP-8 package. | Required where firmware hang detection is mandated (e.g., IEC 62304 Class B medical devices). | Select if watchdog functionality is needed; otherwise STM708DS6F offers simpler timing behavior and lower risk of spurious timeout. |
| MAX692CPA+ | 4.63 V fixed reset threshold; no PFI/PFO; SO-8 only; higher 100 µA supply current. | Suitable for legacy designs using SOIC footprints and fixed-threshold supervision without power-fail warning. | Choose only for pin-compatible SO-8 replacement; lacks PFI flexibility and TSSOP space savings of STM708DS6F. |
Compared with STM706RS6F and MAX692CPA+, the STM708DS6F uniquely delivers dual complementary reset outputs and integrated PFI/PFO in TSSOP-8 without watchdog overhead - optimizing for deterministic reset control and compact industrial PCBs.
Availability
STM708DS6F is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, automotive body control modules, and medical infusion pump controllers requiring stable component supply across long production lifecycles.
Supply support for STM708DS6F 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.
The STM70x series is designed specifically for robust, low-power microprocessor supervision in space- and reliability-constrained embedded systems - emphasizing precision threshold accuracy, guaranteed low-VCC operation, and flexible reset signaling.
FAQ
What is the function of the NC pin on STM708DS6F?
Pin 3 is marked NC (No Connect) and is internally unconnected - it must remain floating with no external bias or loading. This pin has no electrical function and is reserved for mechanical alignment or future product variants; connecting it risks undefined behavior or ESD vulnerability.
Can STM708DS6F be used with a 3.3 V microcontroller?
No - STM708DS6F is strictly a 5 V supervisor: its VCC range is 4.5–5.5 V, VRST threshold is 4.25–4.50 V, and outputs are designed to interface with 5 V logic families. Using it with 3.3 V systems risks invalid reset assertion and potential damage due to overvoltage on RST/RST pins during VCC ramp-up.
How does the power-fail comparator work without a watchdog timer?
The PFI/PFO function operates independently: PFI is compared to a fixed 1.25 V internal reference, and PFO asserts low when PFI falls below that threshold. This requires no watchdog interaction - it's a standalone undervoltage detector usable for early warning or MR-triggered reset, fully functional in STM708DS6F despite absence of WDI/WDO.
Is the MR pin internally pulled up, and what is its resistance value?
Yes - MR has an internal pull-up resistor of 40 kΩ (typical), enabling direct switch-to-ground connection without external components. This value ensures reliable logic-high state while allowing TTL/CMOS-compatible drive; it also supports noise immunity when paired with a 0.1 µF capacitor to ground in electrically noisy environments.
STM708DS6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
STM708DS6F FAQ
1.How can I place an order for STM708DS6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM708DS6F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM708DS6F reliable?
The price and inventory of STM708DS6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM708DS6F is usually 5 days.
3.What payment methods are accepted for STM708DS6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM708DS6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM708DS6F?
STM708DS6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM708DS6F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM708DS6F?
For technical support, including STM708DS6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM708DS6F requirements.
6.How does Aetrix verify that STM708DS6F is sourced from the original manufacturer or authorized distributors?
All STM708DS6F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM708DS6F meets industry standards.
7.What is the process for return or replacement of STM708DS6F?
All STM708DS6F units undergo pre-shipment inspection (PSI). If there is an issue with STM708DS6F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM708DS6F part is unused and in its original packaging.
Return procedure for STM708DS6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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