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STMicroelectronics STM806TM6F
- Part No.:
- STM806TM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM806TM6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,875
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Product details
Overview
STM806TM6F from STMicroelectronics is a 3 V industrial-grade microprocessor supervisor IC with integrated battery switchover, active-low push-pull RST output, manual reset (MR) input, and power-fail comparator (PFI/PFO). It guarantees reset assertion down to VCC = 1.0 V, features 200 ms typical reset timeout (trec), and draws only 40 µA typical supply current. It is used in embedded systems requiring reliable power monitoring and non-volatile SRAM backup during main supply failure.
For engineers reviewing the STM806TM6F datasheet, STM806TM6F pinout, STM806TM6F application, or STM806TM6F equivalent, key selection criteria include guaranteed reset down to 1.0 V VCC, absence of watchdog timer (distinguishing it from STM690/802/804/805), MR-driven reset timing, PFI/PFO threshold behavior at 2.4 V switchover, and SO8 package compatibility with LPSRAM backup circuits.
Technical Context
The STM806 operates as a dedicated voltage-monitoring supervisor without watchdog functionality-confirmed by datasheet Section 2.3 stating "NOT available on STM704/795/806". Its core logic asserts RST low when VCC falls below VRST (typically 2.63 V), when MR is pulled low, or when PFI drops below VPFI (2.4 V) or VCC falls below VSW (2.4 V).
VOUT automatically switches between VCC and VBAT using an internal P-channel MOSFET; switchover occurs at VSW = 2.4 V with hysteresis, and Vccsw provides a push-pull indicator signal for external PMOS control. All I/Os-including MR (with 40 kΩ internal pull-up), PFO (push-pull), and RST-are fully specified for –40 °C to +85 °C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 2.63 V (typ), ensures reliable MCU reset initiation before brownout affects digital logic |
| Reset Timeout (trec) | 200 ms (typ), provides sufficient hold time for full system initialization after power recovery |
| VCC Switchover Voltage (VSW) | 2.4 V (typ), triggers automatic VOUT source switch from VCC to VBAT before SRAM data loss |
| Supply Current (ICC) | 40 µA (typ), enables long-term battery-backed operation without significant drain |
| Battery Supply Current (IBAT) | 0.4 µA (typ), minimizes backup battery depletion during extended VCC outage |
| Operating Temperature | –40 °C to +85 °C, qualified for industrial environments including factory automation and metering |
| Reset Output Type | Active-low push-pull RST, drives standard CMOS/TTL reset inputs without external pull-up |
Pinout & Package
STM806TM6F is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package per ST's DocID10519 Rev 10, Table 8 and Figure 5. Pin assignments are validated against Figure 5 (STM704/806 connections) and Table 3 (Pin description), confirming no WDI or E/ECON pins-consistent with its simplified supervisor role.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: PFO | Power-fail output | Push-pull active-low signal indicating imminent VCC collapse or PFI < 2.4 V; drives interrupt or NMI lines directly |
| 2: VOUT | Supply output voltage | Switched output delivering regulated VCC or VBAT to external LPSRAM; supports up to 75 mA load |
| 3: VCC | Main supply input | Primary 3 V system rail; monitored for reset assertion and switchover control |
| 4: RST | Active-low reset output | Push-pull output asserted low during VCC undervoltage, MR activation, or PFI event; meets MCU reset timing requirements |
| 5: VSS | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 6: MR | Manual reset input | Active-low input with 40 kΩ internal pull-up; debounced internally-no external RC needed for push-button use |
| 7: PFI | Power-fail input | Monitors auxiliary rail or scaled VCC; asserts PFO when voltage falls below 2.4 V threshold |
| 8: VBAT | Backup battery input | Accepts 1.0–5.5 V backup source; automatically powers VOUT when VCC drops below 2.4 V |
Key Features
| Feature | Design Value |
|---|---|
| No watchdog circuitry | Eliminates false resets from software hangs while reducing BOM count and layout complexity |
| Guaranteed RST down to VCC = 1.0 V | Ensures deterministic reset behavior even during deep brownout, critical for flash write integrity |
| Automatic battery switchover at 2.4 V | Preserves LPSRAM contents without firmware intervention or external analog switches |
| Integrated PFI/PFO comparator | Provides early power-fail warning ≥100 µs before VCC crosses reset threshold, enabling graceful shutdown |
| MR with internal 40 kΩ pull-up | Supports direct push-button connection to ground-no external resistor required for basic reset functionality |
Applications
| Industrial PLC Controller | Smart Electricity Meter |
|---|---|
|
Use Scenario: Maintains real-time clock and tariff data in external LPSRAM during grid outages lasting minutes to hours. IC Role / Device Role / Timing Role: Supervisor IC providing VOUT switchover, PFO-triggered firmware save, and MR-initiated calibration reset. Use Value: Prevents data corruption by guaranteeing SRAM retention via seamless VBAT takeover at 2.4 V, with <0.4 µA battery drain. |
Use Scenario: Secures billing registers and tamper logs during transient AC line dips or capacitor discharge intervals. IC Role / Device Role / Timing Role: Power-fail detector asserting PFO to trigger EEPROM commit, then holding MCU in RST until stable VCC returns. Use Value: Enables deterministic 200 ms reset hold and 2.4 V PFI threshold detection-meeting IEC 62053-21 voltage sag immunity requirements. |
| Point-of-Sale Terminal | Building Automation Sensor Node |
|
Use Scenario: Preserves transaction buffer and cryptographic keys in LPSRAM during brief UPS switchover or battery replacement. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3 V rail and provides MR-initiated secure reboot after card reader fault. Use Value: Combines push-button reset (MR) with guaranteed 1.0 V RST assertion-ensuring safe state recovery even under degraded power conditions. |
Use Scenario: Powers Zigbee/Thread radio memory and sensor configuration during 10–30 s battery-only operation after mains loss. IC Role / Device Role / Timing Role: Low-quiescent supervisor enabling >10-year coin-cell life via 40 µA ICC and 0.4 µA IBAT. Use Value: Delivers industrial-temp operation (–40 °C to +85 °C) and RoHS-compliant SO8 packaging suitable for sealed outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM802TSAF | Includes watchdog timer (1.6 s typ); same RST, MR, PFI/PFO, and switchover functions | Required where MCU lockup detection is mandated; adds complexity if unused | Select STM802TSAF only if watchdog functionality is needed-STM806TM6F avoids unnecessary timer overhead and pin count |
| MAX691ACPA+ | 5 V tolerant; higher reset threshold (4.65 V); no PFI/PFO; uses external capacitor for trec | Suitable for legacy 5 V systems but incompatible with 3 V LPSRAM backup architecture | STM806TM6F is preferred for 3 V systems requiring integrated PFI/PFO and battery switchover-MAX691 lacks both |
Compared with STM802TSAF and MAX691ACPA+, STM806TM6F uniquely omits watchdog logic while retaining full PFI/PFO, MR, and VBAT switchover-making it optimal for cost-sensitive, space-constrained 3 V industrial designs where deterministic reset suffices.
Availability
STM806TM6F is available at Aetrix Electronics and suitable for industrial PLC controllers, smart electricity meters, point-of-sale terminals, and building automation sensor nodes requiring stable component supply across multi-year production cycles.
Supply support for STM806TM6F 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 STM690/704/795/802/804/805/806 family was designed specifically for robust, low-power microprocessor supervision in 3 V embedded systems-emphasizing reliability, battery backup integration, and industrial temperature resilience.
FAQ
Does STM806TM6F include a watchdog timer?
No. The STM806TM6F explicitly excludes watchdog functionality, as confirmed in Section 2.3 of the official datasheet (DocID10519 Rev 10): "Watchdog input (NOT available on STM704/795/806)". This distinguishes it from STM690/802/804/805 and simplifies design where software lockup detection is handled externally or not required.
What is the function of the Vccsw pin on STM806TM6F?
Vccsw is a push-pull output that goes high when VOUT switches to VBAT and low when VOUT reconnects to VCC. As stated in Section 1.1.8, it enables driving the gate of an external PMOS transistor to extend VOUT current capability beyond the internal 75 mA limit-critical for high-capacity SRAM banks or auxiliary peripherals.
Can STM806TM6F operate without a backup battery?
Yes. Per Section 1.1.11 and Figure 5, VBAT and VOUT may both be connected to VCC when no battery is used. In this configuration, VOUT remains tied to VCC, and all supervision functions-including RST assertion, MR reset, and PFI/PFO monitoring-operate normally without battery switchover.
Is the MR pin internally pulled up, and what is its resistance value?
Yes. Section 2.2 specifies a 40 kΩ internal pull-up resistor on the MR pin, allowing it to be left unconnected when unused. This eliminates the need for an external pull-up and supports direct connection of a momentary switch between MR and GND-debouncing is handled internally, with no external RC network required.
STM806TM6F 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
STM806TM6F FAQ
1.How can I place an order for STM806TM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM806TM6F 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 STM806TM6F reliable?
The price and inventory of STM806TM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM806TM6F is usually 5 days.
3.What payment methods are accepted for STM806TM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM806TM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM806TM6F?
STM806TM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM806TM6F 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 STM806TM6F?
For technical support, including STM806TM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM806TM6F requirements.
6.How does Aetrix verify that STM806TM6F is sourced from the original manufacturer or authorized distributors?
All STM806TM6F 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 STM806TM6F meets industry standards.
7.What is the process for return or replacement of STM806TM6F?
All STM806TM6F units undergo pre-shipment inspection (PSI). If there is an issue with STM806TM6F, 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 STM806TM6F part is unused and in its original packaging.
Return procedure for STM806TM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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