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STMicroelectronics STM690TM6F
- Part No.:
- STM690TM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM690TM6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,845
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Product details
Overview
STM690TM6F from STMicroelectronics is a 3 V industrial-grade microprocessor supervisor IC with integrated battery switchover, dual reset outputs (active-low RST and active-high RST), manual reset input (MR), watchdog timer (1.6 s typ), and power-fail comparator (PFI/PFO). It guarantees RST assertion down to VCC = 1.0 V and supports external LPSRAM non-volatilization in embedded systems requiring reliable power monitoring and backup switching.
For engineers reviewing the STM690TM6F datasheet, STM690TM6F pinout, STM690TM6F application, or STM690TM6F equivalent, key selection considerations include guaranteed reset assertion at low VCC, automatic VCC/VBAT switchover at 2.4 V threshold, 200 ms typical reset timeout (trec), 0.4 µA typical battery supply current, and compatibility with SO8 packaging for space-constrained industrial control and data logging designs.
Technical Context
The STM690TM6F implements a precision voltage reference and comparator to monitor VCC against a fixed reset threshold (VRST), asserting RST/RST when VCC drops below 2.63 V (typ) or during MR activation or watchdog timeout. Its internal trec generator ensures minimum 200 ms reset pulse width after any reset trigger event.
Battery switchover is managed via a P-channel MOSFET switch connecting VCC or VBAT to VOUT based on VCC vs. VSW (2.4 V) comparison; Vccsw provides push-pull indication of switchover state, enabling external PMOS gate drive for >75 mA IOUT. The PFI/PFO comparator operates independently with VPFI = 1.25 V (typ) and push-pull PFO output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typ); ensures MCU reset before brownout-induced instability in 3 V systems |
| Reset Timeout (trec) | 200 ms (typ); guarantees sufficient hold time for full processor initialization |
| Watchdog Timeout | 1.6 s (typ); detects MCU lockup without requiring software intervention |
| Battery Supply Current | 0.4 µA (typ); enables multi-year operation on coin-cell backup without significant drain |
| Power-Fail Threshold (VPFI) | 1.25 V (typ); triggers early warning before VCC collapse, allowing graceful shutdown |
| VCC Switchover Voltage (VSW) | 2.4 V; switches VOUT from VCC to VBAT before SRAM data retention fails |
| Operating Temperature | –40 °C to +85 °C; qualified for industrial environments without derating |
Pinout & Package
STM690TM6F is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, suitable for automated PCB assembly and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PFO | Push-pull power-fail output; asserts low when VCC < 2.4 V or PFI < 1.25 V |
| 2 | VOUT | Switched supply output; connects to VCC or VBAT depending on VCC level |
| 3 | VCC | Main 3 V supply input; powers internal circuitry and feeds VOUT when above VSW |
| 4 | Vccsw | Push-pull switchover indicator; high during battery mode, low during main supply mode |
| 5 | VSS | Ground reference; common return path for all internal functions |
| 6 | MR | Active-low manual reset input; internally pulled up, debounced by trec timer |
| 7 | WDI | Watchdog input; toggling within 1.6 s prevents reset assertion |
| 8 | VBAT | Backup battery input; supplies VOUT when VCC falls below 2.4 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | RST (push-pull active-low) and RST (push-pull active-high) enable direct interface with diverse MCU reset architectures |
| Automatic battery switchover | VCC-to-VBAT transition at 2.4 V with 100 Ω on-resistance ensures minimal voltage drop during SRAM backup |
| Low-power battery monitoring | 0.4 µA typical VBAT current extends CR2032 life beyond 10 years in standby |
| Integrated power-fail detection | PFI/PFO comparator provides system-level early warning at 1.25 V threshold, independent of VCC rail |
| Guaranteed reset at low VCC | RST remains valid down to VCC = 1.0 V (no battery) or 0 V < VCC < VRST (with VBAT > 1 V) |
Applications
| Industrial Data Logger | Medical Sensor Node |
|---|---|
|
Use Scenario: Continuous environmental monitoring with periodic flash writes and battery-backed SRAM for last-known-state retention during mains failure. IC Role / Device Role / Timing Role: Supervisor monitors 3.3 V rail, asserts reset on brownout, switches SRAM to coin-cell via VOUT, and signals impending power loss via PFO. Use Value: Prevents SRAM corruption during grid interruption; 200 ms trec ensures full MCU reboot before next sensor cycle. |
Use Scenario: Portable ECG device with real-time waveform buffering in LPSRAM and emergency save-on-power-loss capability. IC Role / Device Role / Timing Role: STM690TM6F detects VCC sag below 2.63 V, triggers MCU reset, activates VBAT backup, and pulses PFO to initiate RAM-to-flash dump. Use Value: Guarantees patient data integrity across power transitions; 0.4 µA VBAT current preserves battery for >5 years in standby. |
| Smart Meter Communication Module | PLC I/O Expansion Unit |
|
Use Scenario: HAN (Home Area Network) module storing encryption keys and usage logs in battery-backed SRAM during RF transmission bursts. IC Role / Device Role / Timing Role: Monitors 3 V supply stability during GSM/LTE transmission surges; uses WDI to detect firmware hang and force safe restart. Use Value: Eliminates need for external watchdog circuit; 1.6 s watchdog timeout aligns with modem command response windows. |
Use Scenario: DIN-rail mounted I/O terminal with volatile configuration storage and deterministic boot sequence after AC power restoration. IC Role / Device Role / Timing Role: Provides clean, 200 ms reset pulse on power-up and brownout; Vccsw output controls external PMOS for 200 mA auxiliary rail sequencing. Use Value: Ensures synchronized initialization of FPGA, ADC, and CAN transceiver; SO8 footprint simplifies layout in constrained chassis space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690EPA+ | Single active-low RST output; no RST, no WDI, no PFI/PFO; 2.63 V reset threshold same | Lacks battery switchover signaling (Vccsw) and power-fail warning; requires external circuitry for SRAM backup control | Select when only basic reset supervision is needed and cost sensitivity outweighs feature completeness |
| TPS3823MPW | Single active-low RST; includes watchdog but no battery switchover or PFI/PFO; 2.63 V threshold; 2.5 µA quiescent current | Cannot support LPSRAM non-volatilization; lacks VOUT/Vccsw interface for external backup switching | Choose for low-cost, low-pin-count reset-only applications where battery backup is handled separately |
Compared with MAX690EPA+ and TPS3823MPW, STM690TM6F uniquely integrates dual-reset outputs, automatic VCC/VBAT switchover with status signaling, and power-fail detection - eliminating four external components typically required for robust industrial SRAM backup systems.
Availability
STM690TM6F is available at Aetrix Electronics and suitable for industrial data loggers, medical sensor nodes, smart meter communication modules, and PLC I/O expansion units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STM690TM6F 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.
The STM690 series belongs to ST's microprocessor supervisory IC product line, engineered specifically for reliable power monitoring, reset generation, and battery-backed memory protection in harsh industrial environments.
FAQ
What is the function of the Vccsw pin on STM690TM6F?
Vccsw is a push-pull output that goes high when VOUT switches from VCC to VBAT (battery backup mode) and low when VOUT reconnects to VCC. It is designed to drive the gate of an external PMOS transistor, enabling higher current (>75 mA) backup supply paths for LPSRAM while maintaining precise switchover timing and isolation.
Can STM690TM6F operate without a backup battery?
Yes. When no battery is used, VBAT and VOUT must both be connected to VCC. In this configuration, the device functions as a standard 3 V supervisor with RST/RST outputs, MR input, WDI watchdog, and PFI/PFO comparator - all features remain fully operational except battery switchover and Vccsw signaling.
How does the watchdog timer interact with the reset signal?
The watchdog timer triggers reset if WDI remains static (high or low) for ≥1.6 s. Reset assertion clears the timer; toggling WDI (edge-sensitive, ≥50 ns pulses) resets the timeout counter. During active reset, the timer is held inactive and resumes counting only after RST deasserts - preventing spurious timeouts during MCU recovery.
Is STM690TM6F RoHS compliant and lead-free?
Yes. STM690TM6F is RoHS-compliant and manufactured using lead-free processes per Directive 2011/65/EU. The SO8 package uses matte tin (Sn) termination finish, and all materials meet STMicroelectronics' qualified green standards for industrial-grade reliability and environmental safety.
STM690TM6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- 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-SOIC
STM690TM6F FAQ
1.How can I place an order for STM690TM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM690TM6F 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 STM690TM6F reliable?
The price and inventory of STM690TM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM690TM6F is usually 5 days.
3.What payment methods are accepted for STM690TM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM690TM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM690TM6F?
STM690TM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM690TM6F 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 STM690TM6F?
For technical support, including STM690TM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM690TM6F requirements.
6.How does Aetrix verify that STM690TM6F is sourced from the original manufacturer or authorized distributors?
All STM690TM6F 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 STM690TM6F meets industry standards.
7.What is the process for return or replacement of STM690TM6F?
All STM690TM6F units undergo pre-shipment inspection (PSI). If there is an issue with STM690TM6F, 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 STM690TM6F part is unused and in its original packaging.
Return procedure for STM690TM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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MIC826SYMT-TR
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