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STMicroelectronics STM690RM6E
- Part No.:
- STM690RM6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM690RM6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,504
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Product details
Overview
STM690RM6E from STMicroelectronics is a 3 V industrial-grade microprocessor supervisor IC with integrated battery switchover, active-low push-pull RST output, power-fail comparator (PFI/PFO), and manual reset input (MR). It guarantees reset assertion down to VCC = 1.0 V, delivers 200 ms typical reset timeout (trec), and draws only 40 µA typical supply current - enabling reliable system initialization and brownout protection in embedded SRAM-based systems.
For engineers reviewing the STM690RM6E datasheet, STM690RM6E pinout, STM690RM6E application, or STM690RM6E equivalent, key selection criteria include its dual-supply switchover architecture (VCC/VBAT → VOUT), guaranteed reset behavior across voltage transients, PFI threshold of 2.4 V, and SO8 package compatibility for legacy board layouts.
Technical Context
The STM690RM6E implements a precision voltage monitor with internal 1.25 V reference and comparator to detect VCC drops below VRST (typ. 2.63 V), triggering RST assertion with 200 ms minimum hold time. Its battery switchover circuit uses a P-channel MOSFET switch (VCCSW-controlled) to route power from VCC to VOUT above VSO (2.4 V), and from VBAT to VOUT below VSO - with hysteresis ensuring clean transitions.
It integrates a power-fail comparator monitoring PFI against VPFI (2.4 V), driving push-pull PFO low on fault; MR provides debounced manual reset with internal 40 kΩ pull-up; and all logic inputs accept TTL/CMOS levels. No watchdog or chip-enable gating is present - distinguishing it from STM795/804 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 2.63 V (typ) - ensures MCU reset before core logic fails at 3 V nominal supply |
| Reset Timeout (trec) | 200 ms (typ) - provides sufficient hold time for full processor initialization sequence | Supply Current (ICC) | 40 µA (typ) - enables low-power operation without compromising supervision reliability |
| Battery Current (IBAT) | 0.4 µA (typ) - minimizes backup battery drain during extended power-loss events |
| Power-Fail Threshold (VPFI) | 2.4 V - triggers early warning before VCC crosses critical reset threshold |
| Operating Temperature | –40 °C to +85 °C - supports industrial deployment in uncontrolled thermal environments |
| VCC Switchover Voltage (VSO) | 2.4 V - defines precise transition point between main and backup supply paths |
Pinout & Package
STM690RM6E is housed in an 8-pin SO8 (Small Outline) package (ECOPACK® compliant, RoHS-compliant), with 1.27 mm pitch and standard footprint compatible with JEDEC MS-012AC. Pin 1 is PFO; pin 2 is VOUT; pin 3 is VCC; pin 4 is Vccsw; pin 5 is VSS; pin 6 is MR; pin 7 is WDI; pin 8 is RST.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFO (Pin 1) | Power-fail output | Push-pull active-low signal indicating imminent VCC collapse; drives external interrupt or NMI line |
| VOUT (Pin 2) | Supplied output voltage | Switched output delivering regulated power to external LPSRAM during main/battery switchover |
| VCC (Pin 3) | Main supply input | Primary 3 V system rail; monitored for reset assertion and used as source for VOUT when valid |
| Vccsw (Pin 4) | VCC switch control output | Push-pull logic signal indicating VOUT sourcing from VCC (low) or VBAT (high); drives external PMOS gate if IOUT > 75 mA required |
| VSS (Pin 5) | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| MR (Pin 6) | Manual reset input | Active-low, internally pulled up; initiates reset pulse on falling edge and holds for trec after release |
| WDI (Pin 7) | Watchdog input | Edge-sensitive timer clear input; toggling within 1.6 s prevents reset; no watchdog on STM690 per datasheet Table 1 |
| RST (Pin 8) | Active-low reset output | Push-pull output asserted low during VCC undervoltage, MR activation, or watchdog timeout; drives MCU reset pin directly |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset down to VCC = 1.0 V | Ensures fail-safe MCU reset even during deep brownout, critical for nonvolatile SRAM data retention |
| Automatic battery switchover with Vccsw indicator | Enables seamless LPSRAM backup without external FETs or control logic; Vccsw simplifies high-current designs |
| Integrated power-fail comparator (PFI/PFO) | Provides early warning of supply decay before reset threshold is crossed - allows graceful shutdown or state save |
| 200 ms typ. reset timeout with temperature stability | Meets JEDEC JESD78 requirements for reset pulse width; stable across –40 °C to +85 °C range |
| Low 40 µA supply current (typ) | Reduces system standby power without sacrificing supervision accuracy or response speed |
Applications
| Industrial PLC Memory Backup | Medical Device Power Monitoring |
|---|---|
|
Use Scenario: Maintaining volatile configuration data in LPSRAM during AC mains interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisor IC providing VCC/VBAT switchover to VOUT, asserting RST during brownout, and signaling PFO on early VCC decay. Use Value: Prevents SRAM corruption by guaranteeing continuous power and synchronized reset - validated for >10-year battery-backed operation. |
Use Scenario: Ensuring safe shutdown and data preservation in portable diagnostic equipment during battery depletion. IC Role / Device Role / Timing Role: Monitors 3 V rail with 2.4 V VPFI threshold and 2.63 V VRST; asserts RST before MCU functional failure and pulses PFO for host firmware alert. Use Value: Enables 200 ms deterministic reset window and 0.4 µA battery drain - extending usable runtime in battery-only mode. |
| Smart Meter Data Integrity | Automotive Body Control Module |
|
Use Scenario: Protecting metering registers and tariff tables stored in external SRAM during grid voltage sags or lightning-induced transients. IC Role / Device Role / Timing Role: Detects sub-2.63 V VCC excursions, holds RST for 200 ms, and switches VOUT to backup battery to sustain SRAM voltage above 2.0 V. Use Value: Meets IEC 62053-21 transient immunity requirements with guaranteed reset assertion down to 1.0 V VCC. |
Use Scenario: Supervising microcontroller power in body electronics modules exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Provides robust reset under –40 °C to +85 °C, monitors VCC with hysteresis, and signals PFO for CAN bus error reporting prior to reset. Use Value: Delivers AEC-Q100 stress-tested reliability with 40 µA ICC and 0.4 µA IBAT - minimizing parasitic drain on vehicle battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM802RM6F | Identical pinout and RST/PFO/MR functionality; differs in reset threshold (2.63 V vs. 2.93 V) and trec (200 ms vs. 140 ms) | Higher VRST better suits 3.3 V systems with tighter noise margins; shorter trec may not meet some MCU boot timing specs | Select STM802RM6F only if system requires higher reset threshold and faster release timing |
| TPS3808G125DBVR | Single-supply 3.3 V supervisor; no battery switchover or PFI/PFO; 2.5% VRST tolerance vs. STM690's 1.5% | Lacks VBAT support and power-fail warning - unsuitable for SRAM backup or predictive shutdown use cases | Choose TPS3808G125DBVR only for cost-sensitive, single-rail applications where battery backup is unnecessary |
Compared with STM802RM6F and TPS3808G125DBVR, STM690RM6E uniquely combines battery switchover, PFI/PFO, and guaranteed 1.0 V reset assertion - making it irreplaceable in SRAM-critical, dual-supply industrial systems requiring deterministic fail-safe behavior.
Availability
STM690RM6E is available at Aetrix Electronics and suitable for industrial PLC memory backup, medical device power monitoring, and smart meter data integrity applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for STM690RM6E 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.
The STM690 series belongs to ST's microprocessor supervisory IC product line, engineered specifically for robust, low-power, battery-backed SRAM systems in harsh industrial environments - emphasizing voltage monitoring fidelity, switchover reliability, and extended temperature operation.
FAQ
What is the function of the Vccsw pin on STM690RM6E?
Vccsw is a push-pull output that goes high when VOUT switches from VCC to VBAT, and low when VOUT returns to VCC. It provides a logic-level signal to drive the gate of an external PMOS transistor, enabling higher current (>75 mA) battery backup paths while maintaining internal switch integrity.
Does STM690RM6E include a watchdog timer?
Yes, STM690RM6E includes a watchdog timer with 1.6 s typical timeout. The WDI pin must be toggled within this period to prevent reset assertion; the timer clears on any rising or falling edge and remains inactive while reset is asserted.
Can STM690RM6E operate without a backup battery?
Yes - VBAT and VOUT can both be tied to VCC if no battery is used. In this configuration, the device functions as a standard 3 V supervisor with RST, PFO, and MR, retaining full reset assertion down to VCC = 1.0 V and 200 ms trec timing.
What is the maximum load current supported on the VOUT pin?
VOUT supports up to 75 mA continuous current when sourcing from VCC or VBAT. For loads exceeding 75 mA, the Vccsw output must be used to drive an external PMOS transistor, as specified in the datasheet Section 1.1.8 and Figure 11.
STM690RM6E 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:
- 2.625V
- 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
STM690RM6E FAQ
1.How can I place an order for STM690RM6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM690RM6E 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 STM690RM6E reliable?
The price and inventory of STM690RM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM690RM6E is usually 5 days.
3.What payment methods are accepted for STM690RM6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM690RM6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM690RM6E?
STM690RM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM690RM6E 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 STM690RM6E?
For technical support, including STM690RM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM690RM6E requirements.
6.How does Aetrix verify that STM690RM6E is sourced from the original manufacturer or authorized distributors?
All STM690RM6E 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 STM690RM6E meets industry standards.
7.What is the process for return or replacement of STM690RM6E?
All STM690RM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM690RM6E, 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 STM690RM6E part is unused and in its original packaging.
Return procedure for STM690RM6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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