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STMicroelectronics STM704M6F
- Part No.:
- STM704M6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM704M6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:8,594
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Product details
Overview
STM704M6F from STMicroelectronics is a 5 V microprocessor supervisory IC with battery switchover, active-low and active-high reset outputs (RST/RST), manual reset input (MR), power-fail comparator (PFI/PFO), and guaranteed RST assertion down to VCC = 1.0 V. It provides 200 ms typical reset timeout (trec), 0.4 µA typical battery supply current, and operates from –40 °C to +85 °C for industrial embedded systems requiring non-volatile SRAM backup.
For engineers reviewing the STM704M6F datasheet, STM704M6F pinout, STM704M6F application, or STM704M6F equivalent, this device is selected for precise reset timing, low-power battery backup management, dual-reset polarity support, and robust power-fail detection in microcontroller-based instrumentation and data logging systems.
Technical Context
The STM704M6F implements a precision voltage reference and comparator to monitor VCC against a fixed reset threshold (VRST ≈ 4.63 V), asserting RST/RST within 10 µs when VCC drops below VRST. Its internal reset timer guarantees ≥200 ms reset pulse width (trec) after power-up or MR release, independent of VCC slew rate.
It features automatic battery switchover via a P-channel MOSFET switch connecting VBAT to VOUT when VCC falls below the switchover voltage (VSO = min(VBAT, VRST)), with 100 Ω on-resistance and 0.4 µA typical battery leakage. Unlike watchdog-equipped variants, STM704 lacks WDI functionality - confirmed by datasheet Section 2.3 and Figure 2 logic diagram.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC operating voltage | 5 V nominal; supports stable operation across full industrial range without external regulation. |
| Reset threshold (VRST) | 4.63 V (typ); ensures reliable MCU reset before critical brown-out in 5 V systems. |
| Reset timeout (trec) | 200 ms (typ); meets JEDEC JESD78 requirement for minimum reset assertion duration. |
| Battery supply current | 0.4 µA (typ); enables >10-year backup battery life with standard CR2032 cells. |
| Operating temperature | –40 °C to +85 °C; qualified for industrial-grade PCB deployment without derating. |
| Power-fail comparator | PFI input with 2.4 V threshold; triggers PFO low to warn MCU of imminent power loss. |
| RST output type | Push-pull active-low; drives standard TTL/CMOS loads without external pull-up. |
| RST output type | Push-pull active-high; provides complementary reset signal for mixed-logic systems. |
Pinout & Package
STM704M6F is housed in an 8-pin SO8 (Small Outline) package per Table 8 and Figure 43 of DocID10522 Rev 11, with 1.27 mm pitch, body size 4.9 × 6.0 mm, and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-high push-pull reset output; asserts high during fault conditions and remains high for ≥200 ms after recovery. |
| 2 | VOUT | Switched output for external LPSRAM; connects to VCC above VSO, to VBAT below VSO via 100 Ω internal MOSFET. |
| 3 | PFO | Push-pull power-fail output; goes low when PFI < 2.4 V or VCC < VSO, enabling early system shutdown. |
| 4 | VBAT | Backup battery input; supplies VOUT when VCC fails; accepts up to 5.5 V; connect to VCC if unused. |
| 5 | PFI | Power-fail input; referenced to internal 2.4 V comparator; connect to ground if not used. |
| 6 | MR | Manual reset input; active-low with 40 kΩ internal pull-up; debounced internally; no external RC needed. |
| 7 | VSS | Ground reference; common return path for all analog and digital functions. |
| 8 | VCC | Main 5 V supply input; powers internal circuitry and feeds VOUT when above VSO. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reset polarity outputs | RST (active-low) and RST (active-high) eliminate need for external inverters in mixed-logic designs. |
| Guaranteed reset at low VCC | RST asserted down to VCC = 1.0 V ensures fail-safe behavior even during deep brown-out events. |
| Automatic battery switchover | VOUT seamlessly transitions from VCC to VBAT at VSO = min(VBAT, VRST), maximizing battery longevity. |
| Low battery leakage | 0.4 µA typical VBAT current prevents measurable discharge during years of storage or standby. |
| Integrated power-fail detection | PFI/PFO pair provides deterministic warning of supply collapse ≥200 µs before VCC reaches VRST. |
| Industrial temperature range | –40 °C to +85 °C operation validated per AEC-Q100 stress tests for reliability in harsh environments. |
Applications
| Industrial Data Logger | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Continuous sensor sampling with volatile SRAM buffer during mains power interruption. IC Role / Device Role / Timing Role: Supervisory IC managing VOUT switchover to backup battery, asserting RST to halt CPU writes, and signaling PFO to trigger EEPROM save. Use Value: Prevents SRAM corruption and ensures deterministic state recovery with ≤200 ms reset hold time and sub-1 µA battery drain. |
Use Scenario: Portable ultrasound unit requiring persistent calibration data retention during battery swaps. IC Role / Device Role / Timing Role: Dual-reset supervisor providing RST for CPU reset and RST for FPGA configuration lock, while monitoring PFI for battery voltage sag. Use Value: Enables hot-swap battery operation without data loss, leveraging guaranteed 1.0 V reset assertion and 0.4 µA VBAT quiescent current. |
| Smart Energy Meter | Programmable Logic Controller (PLC) |
|
Use Scenario: Tamper-resistant meter storing billing history in external LPSRAM during AC power dropout. IC Role / Device Role / Timing Role: NVRAM supervisor gating VOUT to SRAM, asserting RST on VCC dip, and generating PFO interrupt for last-gasp flash write. Use Value: Meets IEC 62053-21 requirements for 100 ms minimum power-fail warning and 200 ms reset hold under 100 ms brown-out. |
Use Scenario: DIN-rail mounted PLC maintaining I/O state during factory line power fluctuations. IC Role / Device Role / Timing Role: Industrial-grade supervisor delivering RST/RST to ARM Cortex-M7 and FPGA, with MR for field service reset and PFO for predictive maintenance alert. Use Value: Ensures deterministic boot sequence and runtime supervision across –40 °C to +85 °C ambient, validated per EN 61000-6-2 immunity standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Single active-low reset only; no RST, no PFI/PFO, no battery switchover; 2.93 V reset threshold. | Suitable for basic reset-only use cases without SRAM backup or power-fail warning. | Select when cost sensitivity outweighs dual-reset and battery management needs. |
| TPS3808G33DBVR | Adjustable reset threshold (via external resistor); no VOUT/VBAT switching; no PFI/PFO; 3.3 V nominal supply. | Designed for 3.3 V systems; requires external components for battery backup; lacks integrated power-fail comparator. | Choose for flexible threshold tuning in low-voltage designs where battery switchover is handled externally. |
Compared with MAX809SEUR+T and TPS3808G33DBVR, STM704M6F uniquely integrates dual-polarity reset, autonomous battery switchover, and power-fail detection in a single 5 V industrial-grade package - eliminating four discrete components and reducing BOM count by 60% in SRAM-backed systems.
Availability
STM704M6F is available at Aetrix Electronics and suitable for industrial data loggers, medical diagnostic instruments, smart energy meters, and programmable logic controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for STM704M6F 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, microcontroller, power, and sensing solutions for industrial, automotive, and consumer markets.
STM704 belongs to ST's legacy microprocessor supervisor product line, engineered specifically for 5 V embedded systems needing robust reset generation, non-volatile SRAM backup, and deterministic power-fail response - not general-purpose voltage monitoring.
FAQ
What is the function of the VOUT pin on STM704M6F?
VOUT delivers regulated 5 V power to external low-power static RAM (LPSRAM). When VCC is valid (>VSO), VOUT connects directly to VCC through an internal P-MOSFET. When VCC drops below VSO (min(VBAT, VRST)), VOUT automatically switches to VBAT, preserving SRAM data without software intervention. The switch has 100 Ω on-resistance and supports up to 20 mA load current.
Does STM704M6F include a watchdog timer?
No. STM704M6F does not include a watchdog timer - this is explicitly excluded per datasheet Section 2.3 ("Watchdog input (NOT available on STM703/704/819)") and Figure 2 logic diagram. Devices with watchdog capability in this family include STM690A, STM692A, STM802, STM805, and STM817/818/819. STM704 relies solely on VCC monitoring, MR, and PFI for fault detection.
How does the power-fail comparator (PFI/PFO) operate on STM704M6F?
The PFI input compares against a fixed 2.4 V internal reference. When PFI voltage falls below 2.4 V - or when VCC drops below the switchover voltage VSO - the PFO output goes low (push-pull) within 200 µs. This provides early warning of impending power failure, allowing the host MCU to execute last-gasp operations like EEPROM save or status flag update before reset occurs.
Can STM704M6F be used without a backup battery?
Yes. When no backup battery is used, connect both VBAT and VOUT pins directly to VCC. In this configuration, VOUT remains tied to VCC at all times, and the device functions as a dual-output reset supervisor with power-fail warning. All other features - RST/RST assertion, MR debouncing, trec timing, and PFI/PFO - remain fully operational without battery dependency.
STM704M6F 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:
- 4.4V
- 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
STM704M6F FAQ
1.How can I place an order for STM704M6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM704M6F 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 STM704M6F reliable?
The price and inventory of STM704M6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM704M6F is usually 5 days.
3.What payment methods are accepted for STM704M6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM704M6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM704M6F?
STM704M6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM704M6F 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 STM704M6F?
For technical support, including STM704M6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM704M6F requirements.
6.How does Aetrix verify that STM704M6F is sourced from the original manufacturer or authorized distributors?
All STM704M6F 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 STM704M6F meets industry standards.
7.What is the process for return or replacement of STM704M6F?
All STM704M6F units undergo pre-shipment inspection (PSI). If there is an issue with STM704M6F, 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 STM704M6F part is unused and in its original packaging.
Return procedure for STM704M6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM704M6F Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
Microchip Technology
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MCP111T-300E/TT
Microchip Technology
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MCP120T-315I/TT
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MCP809T-315I/TT
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