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STMicroelectronics STM813LM6F
- Part No.:
- STM813LM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM813LM6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,374
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Product details
Overview
STM813LM6F from STMicroelectronics is a 5 V precision voltage supervisor IC with active-high reset output, watchdog timer, manual reset input, and power-fail comparator - designed for reliable microprocessor reset management in industrial systems. It monitors VCC with ±1.5% threshold accuracy (4.50–4.75 V), asserts RST down to VCC = 1.0 V, delivers 200 ms reset timeout (trec), and draws only 40 µA typical supply current.
For engineers reviewing the STM813LM6F datasheet, STM813LM6F pinout, STM813LM6F application, or STM813LM6F equivalent, key selection criteria include guaranteed RST assertion at low VCC, push-pull RST/RST outputs, 1.6 s watchdog timeout, PFI/PFO undervoltage detection, and TSSOP8 packaging for space-constrained PCBs.
Technical Context
The STM813LM6F integrates a precision bandgap reference, dual comparators (VCC monitor and independent PFI threshold), a 1.6 s watchdog timer with WDI edge-sensitive clearing, and trec-based reset timing logic. Its RST output remains valid down to VCC = 1.0 V, and RST is actively driven high when VCC exceeds VRST.
It supports bidirectional MCU reset pin interfacing via external series resistor, enables power-fail warning via VPFI = 1.25 V (±3%), and allows watchdog disable by floating WDI - all implemented in a single monolithic die without external components required for core functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Monitor Threshold | 4.50 V to 4.75 V - ensures reset assertion before 5 V MCU brownout, ±1.5% tolerance over temperature |
| Reset Timeout (trec) | 200 ms (typ) - guarantees minimum reset pulse width for full MCU initialization on power-up or recovery |
| Watchdog Timeout | 1.6 s (typ) - detects firmware lockup; cleared by rising/falling edge on WDI, not level duration |
| Power-Fail Threshold (VPFI) | 1.25 V ±3% - independent of VCC monitor; enables early warning of supply collapse using external divider |
| Supply Current | 40 µA (typ) at TA = 25 °C - enables always-on supervision in low-power embedded systems |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade operation without derating |
| Reset Output Drive | Push-pull RST and RST - eliminates need for external pull-up/pull-down resistors in most MCU interfaces |
Pinout & Package
STM813LM6F is housed in an 8-pin TSSOP package (3 mm × 3 mm body, 0.65 mm pitch), optimized for high-density PCB layouts while maintaining SOIC-compatible footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFO | Power-fail output | Push-pull active-low signal indicating PFI < VPFI; can drive MR directly for cascaded reset |
| 2 - RST | Active-high reset output | Guaranteed logic high when VCC > VRST; asserted high for trec after VCC rise or MR release |
| 3 - VSS | Ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| 4 - VCC | Supply input | 5 V nominal input; powers internal reference, comparators, and output drivers; bypass with 0.1 µF ceramic |
| 5 - PFI | Power-fail input | Analog input compared to 1.25 V reference; connect via resistor divider to unregulated rail for early warning |
| 6 - MR | Manual reset input | Active-low input with internal 40 kΩ pull-up; debounced internally - no external RC needed for switch interface |
| 7 - WDI | Watchdog input | Edge-triggered watchdog clear; toggling within 1.6 s prevents timeout; float to disable watchdog |
| 8 - WDO | Watchdog output | Push-pull active-low watchdog flag; goes high immediately when VCC recovers above VRST |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RST assertion down to VCC = 1.0 V | Ensures deterministic reset behavior during deep brownout, critical for flash write integrity and state recovery |
| Dual reset outputs (RST and RST) | Supports both active-low and active-high MCU reset architectures without level-shifting circuitry |
| Independent power-fail comparator (VPFI = 1.25 V) | Enables predictive shutdown or data save before main supply collapse - decoupled from VCC monitor accuracy |
| Watchdog timer with edge-sensitive WDI | Rejects noise-induced false triggers; responds only to intentional MCU firmware toggles, not static levels |
| 200 ms reset timeout with automatic restart | Resets timer on every VCC crossing of VRST, preventing premature release during marginal supply conditions |
Applications
| Industrial PLC Controller | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Power sequencing and fault recovery in multi-rail 5 V/3.3 V systems with FPGA and ARM Cortex-M7 MCU. IC Role / Device Role / Timing Role: Primary supervisor asserting RST on VCC dip, MR for emergency halt, and PFO for backup battery switchover control. Use Value: Prevents corrupted firmware execution during line transients; 200 ms trec ensures full FPGA configuration reload after brownout. |
Use Scenario: Patient-monitoring device requiring fail-safe boot and runtime watchdog for IEC 62304 compliance. IC Role / Device Role / Timing Role: Dual-role reset generator (RST for MCU, RST for display controller) and watchdog enforcer via WDI polling. Use Value: Active-high RST matches display SoC requirements; 1.6 s watchdog timeout aligns with clinical software task scheduling intervals. |
| Automotive Infotainment Head Unit | Smart Energy Meter |
Use Scenario: Cold-crank 5 V supply monitoring during engine start, where VCC dips below 4.5 V for >100 ms. IC Role / Device Role / Timing Role: VCC supervisor with extended low-VCC validity (down to 1.0 V) and MR-linked WDO for secondary reset escalation. Use Value: Maintains reset assertion through cranking event; RST remains valid even as VCC collapses to 2.8 V, ensuring clean reboot post-cranking. |
Use Scenario: Tamper-resistant meter with backup supercapacitor and real-time clock; requires early power-fail detection for data logging. IC Role / Device Role / Timing Role: PFI connected to regulated 5 V rail via divider; PFO triggers EEPROM save sequence 15 ms before VCC drops below MCU min operating voltage. Use Value: VPFI = 1.25 V ±3% enables precise margin setting - ensures 3.2 ms warning time before 3.3 V MCU brownout at 100 mV/mS droop rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX813L | Same pinout, identical RST/RST/WDO/WDI/PFI/PFO functions; VRST = 4.63 V (fixed), trec = 200 ms, VPFI = 1.25 V | No automotive grade option; same industrial temp range (–40 °C to +85 °C) | Select for drop-in replacement where ST sourcing is constrained; verify PFO drive strength matches load |
| TPS3808G33 | Adjustable reset threshold (via external resistor); trec = 200 ms; no WDO output; PFI absent; RST only (active-low) | Lacks dual reset polarity and watchdog flag output - requires redesign for WDO-driven MR or active-high reset needs | Choose when threshold flexibility is prioritized over watchdog/PFI features; not suitable for STM813L feature-complete replacement |
Compared with MAX813L, STM813LM6F offers identical functionality and pin compatibility but with ST's manufacturing traceability and RoHS-compliant TSSOP8 packaging; versus TPS3808G33, it provides full legacy feature set including WDO, RST, and PFI - eliminating need for supplemental discrete logic.
Availability
STM813LM6F is available at Aetrix Electronics and suitable for industrial automation controllers, medical diagnostic instruments, automotive infotainment units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for STM813LM6F 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 microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
The STM70x/813L supervisor family targets robust power-management in resource-constrained embedded systems, emphasizing guaranteed low-VCC reset behavior, integrated watchdog safety, and minimal external component count.
FAQ
What is the function of the WDO pin on STM813LM6F?
The WDO pin is a push-pull active-low watchdog output that goes low if no edge occurs on WDI within 1.6 s. It returns high immediately when VCC rises above VRST - unlike RST, which holds for trec. WDO can be connected to MR to generate a watchdog-initiated reset, enabling firmware crash recovery without external logic.
Can STM813LM6F operate with a 3.3 V supply?
No. STM813LM6F is specified only for 5 V operation (VCC = 4.5 V to 5.5 V). Its internal voltage reference and comparators are trimmed for 5 V systems, and VRST threshold (4.50–4.75 V) is incompatible with 3.3 V rails. For 3.3 V supervision, ST recommends the STM809 or STM810 families.
How does the power-fail comparator (PFI/PFO) interact with the main reset function?
PFI and PFO operate independently of the VCC monitor. PFI compares against a fixed 1.25 V reference; when PFI falls below this, PFO goes low - providing early warning before VCC drops to VRST. This signal can be used to trigger data save or backup power activation, but does not assert RST unless externally wired to MR.
Is the MR pin internally pulled up, and what is its leakage specification?
Yes, MR has an internal 40 kΩ pull-up resistor to VCC, allowing direct switch-to-ground connection without external components. Input leakage is ±1 µA max over temperature, enabling reliable detection of open/closed states even with long PCB traces. Floating MR is acceptable but not recommended in noisy environments.
STM813LM6F 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:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
STM813LM6F FAQ
1.How can I place an order for STM813LM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM813LM6F 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 STM813LM6F reliable?
The price and inventory of STM813LM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM813LM6F is usually 5 days.
3.What payment methods are accepted for STM813LM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM813LM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM813LM6F?
STM813LM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM813LM6F 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 STM813LM6F?
For technical support, including STM813LM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM813LM6F requirements.
6.How does Aetrix verify that STM813LM6F is sourced from the original manufacturer or authorized distributors?
All STM813LM6F 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 STM813LM6F meets industry standards.
7.What is the process for return or replacement of STM813LM6F?
All STM813LM6F units undergo pre-shipment inspection (PSI). If there is an issue with STM813LM6F, 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 STM813LM6F part is unused and in its original packaging.
Return procedure for STM813LM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM813LM6F Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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