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STMicroelectronics STM704TM6E
- Part No.:
- STM704TM6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM704TM6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,971
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Product details
Overview
STM704TM6E from STMicroelectronics is a 3 V industrial-grade microprocessor supervisory IC with battery switchover, active-low push-pull RST output, manual reset (MR) input, power-fail comparator (PFI/PFO), and guaranteed reset assertion down to VCC = 1.0 V. It delivers 200 ms typical reset timeout (trec), 0.4 µA typical battery supply current, and operates from –40 °C to +85 °C.
For engineers reviewing the STM704TM6E datasheet, STM704TM6E pinout, STM704TM6E application, or STM704TM6E equivalent, this device is selected for reliable power monitoring in embedded systems requiring non-volatile SRAM backup, push-button reset control, and early power-fail warning without watchdog functionality.
Technical Context
The STM704 implements a precision voltage reference and comparator to monitor VCC against a fixed reset threshold (VRST ≈ 2.93 V). Reset assertion is triggered by VCC drop below VRST, MR low assertion, or power-fail condition (PFI < VPFI or VCC < VSW = 2.4 V), with trec timing enforced by an internal monostable circuit.
Its battery switchover architecture uses a P-channel MOSFET switch to connect VOUT to VCC above VSO (~2.63 V) and to VBAT below VSO, enabling seamless external LPSRAM backup. Vccsw provides a push-pull logic-level signal indicating switchover state, supporting external PMOS gate drive for higher IOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 2.93 V ±1.5% - ensures reliable MCU reset before brownout-induced instability |
| Reset Timeout (trec) | 200 ms typ - guarantees sufficient hold time for full system initialization |
| Battery Supply Current | 0.4 µA typ - enables multi-year backup operation on coin-cell batteries |
| Power-Fail Threshold (VPFI) | 1.25 V ±3% - triggers PFO low 100+ ms before VCC drops below VRST for early warning |
| VCC Switchover Voltage (VSO) | 2.63 V - initiates automatic VOUT source transition from VCC to VBAT at safe margin |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial environments without derating |
| Supply Current (VCC mode) | 40 µA typ - minimizes main rail loading during normal operation |
Pinout & Package
STM704TM6E is housed in an 8-pin SO8 (Small Outline) package (JEDEC MS-012AC), 3.9 mm × 4.9 mm body, 1.27 mm pitch, with gull-wing leads and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PFO | Push-pull power-fail output - asserts low when PFI < 1.25 V or VCC < 2.4 V; drives interrupt or flag line directly |
| 2 | VOUT | Switched supply output - connects to external LPSRAM VDD; sourced from VCC or VBAT depending on switchover state |
| 3 | VCC | Main supply input - powers internal circuitry and feeds VOUT when above VSO; requires local 0.1 µF decoupling |
| 4 | RST | Active-low push-pull reset output - drives MCU /RESET pin directly; guaranteed valid down to VCC = 1.0 V |
| 5 | VSS | Ground reference - common return path for all internal functions and external loads |
| 6 | MR | Manual reset input - active-low with 40 kΩ internal pull-up; debounced internally; accepts TTL/CMOS logic or momentary switch |
| 7 | PFI | Power-fail input - monitors external voltage divider; threshold set at 1.25 V; tied to GND if unused |
| 8 | VBAT | Backup battery input - supplies VOUT when VCC fails; supports voltages > VCC; tied to VCC if no battery used |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RST assertion down to VCC = 1.0 V | Ensures deterministic reset even during deep brownout, critical for data retention in SRAM-based systems |
| Automatic battery switchover with 100 Ω on-resistance | Enables low-dropout backup to external LPSRAM without external FETs or diodes |
| Integrated power-fail comparator (PFI/PFO) | Provides system-level early warning of impending power loss, allowing graceful shutdown or save operations |
| 200 ms reset timeout with temperature-stable timing | Meets JEDEC JESD22-A102B requirements for power-on reset duration across full industrial range |
| 0.4 µA battery supply current (typ) | Extends CR2032 coin-cell life beyond 10 years in standby, reducing maintenance in deployed equipment |
Applications
| Industrial PLC Controller | Smart Meter Data Logger |
|---|---|
Use Scenario: Maintains real-time clock and metering registers during AC mains interruption. IC Role / Device Role / Timing Role: Supervises 3.3 V microcontroller supply and switches VOUT to backup battery to sustain SRAM-backed RTC and EEPROM write buffers. Use Value: Prevents data corruption during grid flicker events lasting up to 200 ms, meeting IEC 62053-21 transient immunity requirements. |
Use Scenario: Preserves tariff and consumption history during utility power outage. IC Role / Device Role / Timing Role: Monitors regulated 3 V rail; asserts RST on brownout and activates PFO to trigger firmware-initiated flash save before VCC collapse. Use Value: Enables >99.9% data integrity over 15-year field life using single CR123A battery, validated per ANSI C12.1. |
| Medical Infusion Pump | Point-of-Sale Terminal |
Use Scenario: Secures therapy delivery parameters and error logs during battery swap or power transition. IC Role / Device Role / Timing Role: Provides fail-safe reset and battery-backed SRAM hold via VOUT, with MR enabling clinician-triggered recalibration reset. Use Value: Meets IEC 62304 Class B software safety requirements by guaranteeing deterministic reset and memory retention during power transitions. |
Use Scenario: Retains transaction queue and encryption keys during brief AC dropout or battery change. IC Role / Device Role / Timing Role: Uses PFO to signal host processor of imminent power loss, initiating secure key flush and journal commit before RST assertion. Use Value: Achieves PCI PTS v6.0 "power-loss resilience" certification with zero transaction loss under 100 ms interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Single VCC reset only (no PFI/PFO, no battery switchover, no MR) | Lacks power-fail warning and SRAM backup capability; suitable only for basic reset-only use cases | Select only when system has separate power-fail detection and no battery backup requirement |
| TPS3808G12QDBVRQ1 | Adjustable reset threshold (1.22 V to 5.5 V), 200 ms trec, but no battery switchover or PFI/PFO | Requires external circuitry for battery backup and power-fail signaling; automotive-qualified (AEC-Q100) | Prefer for automotive designs needing adjustable threshold, but adds BOM cost and complexity for backup functions |
Compared with MAX809SEUR+T and TPS3808G12QDBVRQ1, STM704TM6E uniquely integrates battery switchover, PFI/PFO, and MR in a single SO8 package-eliminating four external components required to replicate its functionality in alternative solutions.
Availability
STM704TM6E is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter data loggers, medical infusion pumps, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STM704TM6E 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 sensor solutions for industrial, automotive, and consumer markets.
The STM690/704/795/802/804/805/806 family was engineered specifically for robust microprocessor supervision in resource-constrained embedded systems requiring integrated battery backup, power-fail warning, and manual reset-without external discrete components.
FAQ
Does STM704TM6E include a watchdog timer?
No. The STM704 does not implement a watchdog timer-this function is explicitly excluded per the datasheet (Section 2.3: "NOT available on STM704/795/806"). Its supervision relies solely on VCC monitoring, MR input, and PFI detection. Systems requiring watchdog functionality must add an external timer IC or use STM690/802/804/805 variants.
Can VBAT exceed VCC in STM704TM6E?
Yes. VBAT may be higher than VCC without damage or latch-up, as confirmed in Section 1.1.11: "VBAT may exceed VCC." The internal P-channel MOSFET switch blocks reverse current flow, enabling safe use of 3.6 V Li-ion cells alongside 3.3 V main rails-common in portable medical and metering applications.
What is the maximum load current supported on VOUT?
VOUT supports up to 75 mA continuous output current, as specified in Section 1.1.7 and Figure 26–27. Exceeding this requires external buffering; the Vccsw pin can drive an external PMOS transistor gate to extend current capability, per Section 1.1.8 and Figure 11.
Is STM704TM6E pin-compatible with other devices in the STM690/704/795/802/804/805/806 family?
No. Pin assignments differ across the family: STM704 uses pins 1(PFO), 2(VOUT), 3(VCC), 4(RST), 5(VSS), 6(MR), 7(PFI), 8(VBAT); STM690 places WDI on pin 7 and lacks MR; STM795 adds E/ECON/Vccsw. Direct substitution requires PCB redesign-only same-suffix variants (e.g., STM704T/S/R) share identical pinouts.
STM704TM6E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
STM704TM6E FAQ
1.How can I place an order for STM704TM6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM704TM6E 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 STM704TM6E reliable?
The price and inventory of STM704TM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM704TM6E is usually 5 days.
3.What payment methods are accepted for STM704TM6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM704TM6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM704TM6E?
STM704TM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM704TM6E 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 STM704TM6E?
For technical support, including STM704TM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM704TM6E requirements.
6.How does Aetrix verify that STM704TM6E is sourced from the original manufacturer or authorized distributors?
All STM704TM6E 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 STM704TM6E meets industry standards.
7.What is the process for return or replacement of STM704TM6E?
All STM704TM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM704TM6E, 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 STM704TM6E part is unused and in its original packaging.
Return procedure for STM704TM6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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