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STMicroelectronics STM690SDS6F
- Part No.:
- STM690SDS6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
STM690SDS6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
STM690SDS6F from STMicroelectronics is a 3 V industrial-grade microprocessor supervisor IC with battery switchover, active-low RST output, manual reset (MR), watchdog timer (1.6 s typ), and power-fail comparator (PFI/PFO). It guarantees reset assertion down to VCC = 1.0 V and supports external LPSRAM non-volatilization in embedded control systems requiring fail-safe power monitoring.
For engineers reviewing the STM690SDS6F datasheet, STM690SDS6F pinout, STM690SDS6F application, or STM690SDS6F equivalent, this device delivers precise voltage supervision, automatic VCC-to-VBAT switchover at 2.4 V, low 40 µA supply current, and robust reset timing (200 ms typ trec) for reliable MCU boot and brownout recovery.
Technical Context
The STM690SDS6F integrates a precision voltage reference and comparator to monitor VCC against a fixed reset threshold (VRST ≈ 2.63 V), asserting RST when VCC drops below VRST or during MR activation. Its internal trec generator ensures minimum 200 ms reset pulse width after power-up or fault recovery.
A dedicated watchdog timer monitors WDI activity with 1.6 s timeout; toggling WDI resets the timer, while sustained high/low states trigger reset. The PFI/PFO pair provides early power-fail warning by comparing PFI to VPFI (≈ 1.25 V) and tracking VCC vs. VSW (2.4 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 2.63 V ±1.5% - guarantees valid RST assertion down to VCC = 1.0 V without battery, enabling robust brownout detection. |
| Reset Timeout (trec) | 200 ms (typ) - ensures sufficient MCU initialization time after power-up or fault recovery before release. |
| Watchdog Timeout (tWD) | 1.6 s (typ) - detects MCU lockup by requiring WDI edge within this window; clears on any rising/falling edge. |
| Power-Fail Threshold (VSW) | 2.4 V - triggers switchover to VBAT and asserts PFO when VCC falls below this level, enabling graceful SRAM backup. |
| Supply Current (ICC) | 40 µA (typ) - minimizes main rail loading during normal operation, critical for low-power embedded systems. |
| Battery Supply Current (IBAT) | 0.4 µA (typ) - enables multi-year battery backup for LPSRAM without significant drain during VCC outage. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial environments including factory automation and metering equipment. |
Pinout & Package
STM690SDS6F is housed in an SO8 (Small Outline 8-pin) package per JEDEC MS-012, with 1.27 mm pitch and surface-mount footprint. Pin 1 is marked with a dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFO | Power-fail output | Push-pull active-low signal indicating imminent VCC failure or PFI < VPFI; drives interrupt or backup enable logic. |
| PFI | Power-fail input | Monitors system rail or auxiliary voltage; asserts PFO when input falls below 1.25 V or VCC drops below 2.4 V. |
| WDI | Watchdog input | Edge-sensitive input requiring toggle every ≤1.6 s; floating or static state triggers reset, preventing MCU hang. |
| RST | Active-low reset output | Push-pull output asserted low during VCC undervoltage, MR activation, or watchdog timeout; holds for ≥200 ms. |
| VCC | Main supply input | 3 V nominal input; powers internal circuitry and feeds VOUT via internal PMOS switch when above VSO (2.4 V). |
| VOUT | SRAM supply output | Switched output connected to VCC (above VSO) or VBAT (below VSO); supplies external LPSRAM during power loss. |
| VBAT | Backup battery input | Accepts 1.0–5.5 V backup source; automatically takes over VOUT when VCC falls, preserving SRAM data. |
| VSS | Ground reference | Common return path for all internal circuits and I/O; must be low-impedance connection to system GND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset down to VCC = 1.0 V | Ensures deterministic MCU reset even during deep brownout, eliminating undefined processor states. |
| Automatic battery switchover at 2.4 V | Seamlessly transfers LPSRAM supply from VCC to VBAT without software intervention or external logic. |
| 200 ms typ reset timeout (trec) | Meets typical MCU power-on reset timing requirements without external RC components or timing adjustments. |
| Low 0.4 µA battery current (IBAT) | Extends coin-cell or lithium backup life to >10 years in standby, critical for unattended industrial nodes. |
| Integrated power-fail comparator (PFI/PFO) | Provides early warning of supply collapse, allowing firmware to save state or initiate controlled shutdown before VCC dropout. |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Continuous operation in factory-floor controllers where mains power interruption must not corrupt program memory or I/O state. IC Role / Device Role / Timing Role: Supervisor monitors 3.3 V MCU rail and asserts RST on brownout; switches VOUT to VBAT to retain SRAM contents during outage. Use Value: Prevents firmware corruption and preserves real-time process data across power cycles, reducing field service events. |
Use Scenario: Utility meter with tamper-proof data logging requiring persistent storage during grid outages. IC Role / Device Role / Timing Role: Detects falling VCC via PFI and asserts PFO to trigger EEPROM write; uses VOUT switchover to maintain LPSRAM during 100+ ms interruptions. Use Value: Enables accurate billing data retention without supercapacitor or complex backup circuitry, lowering BOM cost. |
| Medical Diagnostic Handheld | Automotive Body Control Module (BCM) |
Use Scenario: Portable ultrasound or glucose monitor that must retain calibration settings and last measurement after battery swap. IC Role / Device Role / Timing Role: Uses MR input for user-initiated reset and VBAT switchover to preserve SRAM during hot-swap of primary battery. Use Value: Eliminates need for external EEPROM writes on every setting change, improving responsiveness and flash endurance. |
Use Scenario: BCM maintaining door lock status and lighting configuration during ignition-off battery drain. IC Role / Device Role / Timing Role: Monitors 3.3 V domain derived from vehicle battery; asserts RST if supply dips below 2.63 V during cranking. Use Value: Ensures deterministic MCU restart after engine start transients, avoiding spurious relay actuation or CAN bus errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690EPA+ | Higher reset threshold (4.65 V), no watchdog, no battery switchover; 5 V only. | Limited to 5 V systems without backup SRAM support; lacks PFI/PFO and WDI functionality. | Select only for legacy 5 V designs requiring basic reset without supervision features. |
| TPS3823DBVT | 3.3 V reset threshold (3.08 V), no PFI/PFO, no battery switchover, 200 ms trec. | Suitable for simple reset-only use; cannot support LPSRAM backup or power-fail warning. | Choose when cost sensitivity outweighs need for battery switchover and early power-fail detection. |
Compared with MAX690EPA+ and TPS3823DBVT, STM690SDS6F uniquely combines 3 V operation, guaranteed 1.0 V reset, integrated battery switchover, and dual-purpose PFI/PFO-making it the only option for industrial LPSRAM-based systems requiring full power-fail resilience.
Availability
STM690SDS6F is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, medical handheld diagnostics, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STM690SDS6F 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.
STM690 belongs to ST's microprocessor supervisor product line, engineered specifically for robust power monitoring and non-volatile SRAM support in resource-constrained embedded systems operating from 3 V rails.
FAQ
What is the function of the Vccsw pin on STM690SDS6F?
Vccsw is a push-pull output that signals VOUT's power source: high when VOUT is supplied by VBAT (battery mode), low when supplied by VCC. It can drive the gate of an external PMOS transistor to extend IOUT beyond the internal 75 mA limit, enabling higher-current SRAM backup.
Can STM690SDS6F operate without a backup battery?
Yes. When no battery is used, connect both VBAT and VOUT to VCC. The device functions as a standard 3 V supervisor with RST, MR, WDI, and PFI/PFO - all core supervision features remain fully operational without battery switchover.
How does the watchdog timer interact with the reset output?
The watchdog timer triggers RST assertion if WDI remains static for ≥1.6 s. Reset remains active for ≥200 ms (trec) regardless of WDI state. The timer resets on any WDI edge (rising or falling) and is disabled while RST is asserted.
Is STM690SDS6F RoHS compliant and lead-free?
Yes. STM690SDS6F is RoHS-compliant and lead-free per Directive 2011/65/EU. The SO8 package uses matte tin (Sn) termination, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3 for standard reflow assembly.
STM690SDS6F 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:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
STM690SDS6F FAQ
1.How can I place an order for STM690SDS6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM690SDS6F 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 STM690SDS6F reliable?
The price and inventory of STM690SDS6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM690SDS6F is usually 5 days.
3.What payment methods are accepted for STM690SDS6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM690SDS6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM690SDS6F?
STM690SDS6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM690SDS6F 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 STM690SDS6F?
For technical support, including STM690SDS6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM690SDS6F requirements.
6.How does Aetrix verify that STM690SDS6F is sourced from the original manufacturer or authorized distributors?
All STM690SDS6F 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 STM690SDS6F meets industry standards.
7.What is the process for return or replacement of STM690SDS6F?
All STM690SDS6F units undergo pre-shipment inspection (PSI). If there is an issue with STM690SDS6F, 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 STM690SDS6F part is unused and in its original packaging.
Return procedure for STM690SDS6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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