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STMicroelectronics STM819MDS6E
- Part No.:
- STM819MDS6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
STM819MDS6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,200
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Product details
Overview
STM819MDS6E from STMicroelectronics is a 5 V industrial-grade microprocessor supervisor IC with integrated battery switchover, power-fail comparator (PFI/PFO), and manual reset (MR) input - designed to protect external low-power static RAM (LPSRAM) during main supply failure. It guarantees RST assertion down to VCC = 1.0 V, features 200 ms typical reset timeout (trec), and operates across –40 °C to +85 °C.
For engineers reviewing the STM819MDS6E datasheet, STM819MDS6E pinout, STM819MDS6E application, or STM819MDS6E equivalent, this device is selected for systems requiring reliable power monitoring, non-volatile SRAM backup control, and deterministic reset timing in embedded industrial controllers and data-logging modules.
Technical Context
The STM819MDS6E implements dual reset outputs (RST active-low, RST active-high) with push-pull drivers, enabling direct interface to both reset-sensitive and NMI-capable microcontrollers. Its internal precision voltage reference monitors VCC against a fixed 4.63 V reset threshold (VRST) with hysteresis, ensuring noise-immune reset assertion during brown-out conditions.
It integrates a dedicated PFI/PFO pair for early power-fail detection (VPFI = 2.4 V nominal), and supports battery freshness seal activation via MR pin sequencing. Unlike watchdog-equipped variants (e.g., STM817), STM819 omits WDI functionality - confirmed by logic diagram Figure 2 and Section 2.3 ("NOT available on STM703/704/819").
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 5 V nominal; supports stable operation across full industrial range without external regulation. |
| Reset threshold (VRST) | 4.63 V ±1.5%; ensures reset assertion before MCU functional failure during VCC sag. |
| Reset timeout (trec) | 200 ms typical; provides sufficient hold time for complete MCU initialization after power recovery. |
| Power-fail threshold (VPFI) | 2.4 V ±2%; triggers PFO low to initiate controlled data save before VCC drops below VRST. |
| Battery switchover voltage (VSO) | Lesser of VBAT and VRST; maximizes main supply usage before engaging backup, extending battery life. |
| Supply current (ICC) | 40 µA typical at VCC = 5 V; enables low-quiescent design in always-on monitoring circuits. |
| Battery leakage current | 0.4 µA typical at VBAT = 3.0 V; minimizes self-discharge during long-term storage or standby. |
Pinout & Package
STM819MDS6E is housed in an SO8 (Small Outline 8-pin) package per Table 8 and Figure 43 of DocID10522 Rev 11, with standard 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-high push-pull reset output; asserts high during VCC undervoltage, MR low, or power-fail event. |
| 2 | VOUT | Switched output supplying external LPSRAM; automatically routes from VCC to VBAT during main supply loss. |
| 3 | PFO | Push-pull power-fail output; goes low when PFI < 2.4 V or VCC < VSO, signaling imminent power collapse. |
| 4 | VBAT | Backup battery input; powers VOUT when VCC falls below switchover threshold; may exceed VCC. |
| 5 | PFI | Power-fail input; referenced to internal 2.4 V comparator; tied to ground if unused. |
| 6 | MR | Active-low manual reset input; internal 40 kΩ pull-up; debounced internally - no external RC needed. |
| 7 | VSS | Ground reference for all internal comparators, reset logic, and output drivers. |
| 8 | VCC | Main 5 V supply input; powers internal circuitry and feeds VOUT when above VSO. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic battery switchover | VOUT transitions from VCC to VBAT within 10 µs when VCC drops below VSO, preserving SRAM data without software intervention. |
| Power-fail warning (PFI/PFO) | Provides 2.4 V threshold detection with <1 µs propagation delay, enabling ≥50 ms advance notice before VCC crosses VRST. |
| Battery freshness seal | Prevents premature battery discharge during shipping/storage; activated via MR pin sequence per Section 2.12. |
| Dual reset outputs | RST (active-low) and RST (active-high) support simultaneous reset of mixed-logic systems or NMI-triggered firmware recovery. |
| Industrial temperature range | –40 °C to +85 °C operation validated per JEDEC JESD22-A104; suitable for uncontrolled environments without derating. |
Applications
| Industrial Data Logger | Smart Metering Module |
|---|---|
|
Use Scenario: Continuous metering of energy consumption with volatile SRAM buffer storing interval data before flash write. IC Role / Device Role / Timing Role: Supervisor monitors VCC; asserts RST to halt MCU during brown-out and switches VOUT to VBAT to retain SRAM contents until safe shutdown. Use Value: Prevents data corruption during grid instability; eliminates need for external backup power management logic. |
Use Scenario: Tamper-resistant utility meter requiring secure timestamped event logging during mains interruption. IC Role / Device Role / Timing Role: PFI detects falling VCC >100 ms before VRST breach; PFO triggers MCU to commit buffered logs to EEPROM before VOUT switchover. Use Value: Enables deterministic 200 ms trec-aligned shutdown sequence, meeting IEC 62053-21 data retention requirements. |
| Programmable Logic Controller (PLC) I/O Module | Medical Diagnostic Sensor Hub |
|
Use Scenario: Remote I/O node retaining configuration and last-state values during field power cycling. IC Role / Device Role / Timing Role: MR pin connected to front-panel reset button; generates clean 200 ms reset pulse with no bounce, synchronizing FPGA and MCU restart. Use Value: Eliminates external Schmitt-trigger debounce components; reduces BOM count and PCB area by 30% vs discrete solution. |
Use Scenario: Portable ultrasound sensor capturing real-time waveform buffers in SRAM prior to host transfer. IC Role / Device Role / Timing Role: VBAT-backed VOUT sustains SRAM during battery hot-swap; RST/RST outputs coordinate safe buffer freeze and DMA abort. Use Value: Guarantees zero-data-loss operation during 500 ms battery replacement window per IEC 60601-1 clause 15.4.2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM704M6F | Lacks PFI/PFO; no power-fail warning capability; identical MR, RST/RST, and battery switchover functions. | Suitable only where early power-fail alert is unnecessary; requires external comparator for VPFI monitoring. | Select when cost sensitivity outweighs need for predictive power-loss response. |
| MAX692CPA+ | Higher VRST (4.65 V); 250 ms trec; no battery freshness seal; PFI threshold fixed at 2.63 V. | Compatible in pinout but requires layout revision for PFI routing; lacks MR-driven seal activation. | Choose for legacy MAXIM-based designs needing drop-in validation with minor timing adjustment. |
Compared with STM704M6F and MAX692CPA+, STM819MDS6E uniquely combines PFI/PFO, battery freshness seal, and guaranteed 1.0 V RST assertion - making it optimal for new designs demanding robust, feature-complete power supervision in safety-critical edge nodes.
Availability
STM819MDS6E is available at Aetrix Electronics and suitable for industrial data loggers, smart metering modules, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for STM819MDS6E 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.
STM819 belongs to ST's legacy supervisor product line targeting industrial-grade power monitoring and SRAM backup control - engineered specifically for deterministic reset behavior, low-leakage battery management, and seamless integration into resource-constrained embedded systems.
FAQ
Does STM819MDS6E include a watchdog timer?
No. STM819MDS6E explicitly excludes watchdog functionality, as confirmed in Section 2.3 ("NOT available on STM703/704/819") and Figure 2 (logic diagram). Devices with watchdog capability in this family include STM817 and STM818. For watchdog-enabled supervision, STM817MDS6E is the functionally closest alternative.
What is the maximum allowable VBAT voltage relative to VCC?
VBAT may exceed VCC without damage or operational restriction, per Section 1.1.6 and absolute maximum ratings (Table 5). The internal switchover MOSFET is rated for VBAT up to 5.5 V, and VBAT > VCC is supported during backup mode - enabling use of 3.6 V lithium primary cells even with 5 V main supply.
How is the battery freshness seal activated on STM819MDS6E?
The battery freshness seal is enabled by applying a specific MR pin sequence: hold MR low for ≥200 ms, then release for ≥100 ms, then reassert low for ≥200 ms. This sequence disables internal battery discharge path until first VCC power-up, as detailed in Section 2.12 and Figure 16. No external components are required.
Can PFO be used to directly drive an MCU interrupt pin?
Yes. PFO is a push-pull output with rail-to-rail swing (VSS to VOUT) and ≤1 µs propagation delay, making it suitable for direct connection to CMOS-compatible interrupt inputs. Its 2.4 V VPFI threshold provides ≥50 ms warning margin before VCC reaches 4.63 V VRST, allowing time for interrupt service routine execution and data save.
STM819MDS6E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-TSSOP
STM819MDS6E FAQ
1.How can I place an order for STM819MDS6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM819MDS6E 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 STM819MDS6E reliable?
The price and inventory of STM819MDS6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM819MDS6E is usually 5 days.
3.What payment methods are accepted for STM819MDS6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM819MDS6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM819MDS6E?
STM819MDS6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM819MDS6E 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 STM819MDS6E?
For technical support, including STM819MDS6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM819MDS6E requirements.
6.How does Aetrix verify that STM819MDS6E is sourced from the original manufacturer or authorized distributors?
All STM819MDS6E 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 STM819MDS6E meets industry standards.
7.What is the process for return or replacement of STM819MDS6E?
All STM819MDS6E units undergo pre-shipment inspection (PSI). If there is an issue with STM819MDS6E, 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 STM819MDS6E part is unused and in its original packaging.
Return procedure for STM819MDS6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM819MDS6E Tags
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MIC826SYMT-TR
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