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STMicroelectronics STM706YM7F
- Part No.:
- STM706YM7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM706YM7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,111
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Product details
Overview
STM706YM7F from STMicroelectronics is an industrial-grade 5 V microprocessor supervisory IC with precision reset threshold (4.25–4.50 V), integrated watchdog timer (1.6 s typ), manual reset input (MR), and power-fail comparator (PFI/PFO). It asserts active-low RST and active-high RST outputs during VCC undervoltage, MR assertion, or watchdog timeout-ensuring reliable boot sequencing in embedded controllers and power management systems.
For engineers reviewing the STM706YM7F datasheet, STM706YM7F pinout, STM706YM7F application, or STM706YM7F equivalent, key selection criteria include guaranteed RST assertion down to VCC = 1.0 V, 200 ms reset timeout (trec), push-pull RST/RST outputs, automotive-grade temperature option (–40 °C to 125 °C), and TSSOP8 package compatibility with space-constrained PCB layouts.
Technical Context
The STM706YM7F implements dual independent comparators: one for VCC monitoring (VRST = 4.25–4.50 V) and another for power-fail detection (VPFI ≈ 1.25 V), each driving dedicated push-pull outputs. Its watchdog circuit monitors WDI transitions and triggers WDO low after 1.6 s of inactivity-requiring external connection to MR for system reset initiation.
Reset assertion is guaranteed over full industrial temperature range (–40 °C to +85 °C), with trec stabilized at 200 ms (typ) and propagation delay under 30 µs. The device maintains valid RST output down to VCC = 1.0 V and draws only 40 µA (typ) quiescent current, enabling use in low-power always-on monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 5 V nominal; functional operation maintained across full industrial temperature range. |
| Reset Threshold (VRST) | 4.25 V to 4.50 V; precise window ensures reliable reset activation before MCU brownout. |
| Reset Timeout (trec) | 200 ms typical; guarantees minimum reset pulse width for safe microprocessor initialization. |
| Watchdog Timeout (tWD) | 1.6 s typical; detects firmware lockup without requiring external timing components. |
| Supply Current (ICC) | 40 µA typical at 25 °C; enables integration into battery-backed or energy-sensitive systems. |
| Operating Temperature | –40 °C to +85 °C (industrial grade); supports deployment in harsh industrial environments. |
| Reset Output Drive | Push-pull RST (active-low) and RST (active-high); eliminates need for external pull-up/down resistors. |
Pinout & Package
STM706YM7F is housed in a RoHS-compliant 8-pin TSSOP package (3 mm × 3 mm body, 0.65 mm pitch), optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFO | Power-fail output | Push-pull active-low signal indicating PFI voltage drop below VPFI ≈ 1.25 V; used for early power-loss warning. |
| 2 - PFI | Power-fail input | Analog input referenced to internal 1.25 V comparator; accepts divided unregulated supply for predictive brownout detection. |
| 3 - VCC | Supply voltage input | Primary 5 V power rail input; monitored by precision reset comparator with hysteresis. |
| 4 - VSS | Ground reference | Common return path for all internal circuits and output drivers; requires low-impedance PCB connection. |
| 5 - MR | Manual reset input | Active-low logic input with internal 40 kΩ pull-up; debounced via 0.1 µF capacitor for noise immunity in noisy environments. |
| 6 - RST | Active-low reset output | Push-pull output asserted low during VCC undervoltage, MR assertion, or watchdog timeout; drives MCU reset pin directly. |
| 7 - RST | Active-high reset output | Complementary push-pull output asserted high under same conditions; supports bidirectional or active-high reset interfaces. |
| 8 - WDI | Watchdog input | Digital input requiring periodic edge transitions; floating or tri-stated to disable watchdog function (leakage ≤10 µA). |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | RST (active-low) and RST (active-high) enable direct interface with diverse MCU reset architectures without level-shifting. |
| Guaranteed reset down to VCC = 1.0 V | Ensures deterministic reset behavior during deep brownout, critical for fail-safe system shutdown sequences. |
| Integrated power-fail comparator | Independent 1.25 V VPFI threshold allows early warning of supply collapse before VCC drops below MCU operating minimum. |
| Watchdog timer with edge-triggered clear | 1.6 s timeout cleared on any WDI transition (≥50 ns pulse), supporting robust firmware health checking without clock dependency. |
| Low quiescent current (40 µA) | Minimizes standby power draw in always-on monitoring applications such as smart meters and industrial sensors. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitoring 5 V supply rails in programmable logic controllers subject to voltage transients and thermal cycling. IC Role / Device Role / Timing Role: Supervisory IC providing VCC reset, manual reset, and watchdog timeout detection to prevent corrupted firmware execution. Use Value: 200 ms trec ensures full MCU initialization; 4.25–4.50 V VRST window prevents premature reset release during slow-rising supplies. |
Use Scenario: Power integrity monitoring in automotive body electronics operating across –40 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Dual-output supervisor asserting both RST and RST to interface with mixed-signal MCUs requiring active-high or active-low reset signaling. Use Value: Automotive-grade variant supports extended temperature range; push-pull outputs eliminate external pull resistors in EMI-sensitive vehicle networks. |
| Smart Energy Meter | Medical Diagnostic Equipment |
|
Use Scenario: Ensuring reliable boot and runtime supervision in battery-backed utility meters exposed to grid fluctuations. IC Role / Device Role / Timing Role: Combines power-fail warning (PFI/PFO) with reset generation to trigger data save and graceful shutdown prior to complete power loss. Use Value: 1.25 V VPFI threshold enables ~10 ms advance warning before VCC falls below 3.0 V, allowing time-critical EEPROM write completion. |
Use Scenario: Safety-critical reset management in portable diagnostic devices requiring zero-reset-failure operation. IC Role / Device Role / Timing Role: Primary supervisor ensuring deterministic reset assertion during cold start, brownout, and software hang events. Use Value: Guaranteed RST assertion down to VCC = 1.0 V prevents undefined MCU state during rapid power collapse, meeting IEC 62304 safety requirements. |
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 output; no watchdog, PFI/PFO, or RST complement; 4.63 V reset threshold. | Lacks power-fail warning and dual reset polarity; suitable only for basic reset-only designs. | Select when cost sensitivity outweighs feature requirements and system design uses only active-low reset. |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor divider); 200 ms trec; no PFI/PFO or watchdog; 1.2 V to 5.5 V VCC range. | Requires external components for threshold setting; lacks predictive power-fail capability and watchdog functionality. | Choose for flexible threshold tuning in multi-rail systems where PFI/PFO and watchdog are not required. |
Compared with MAX809SEUR+T and TPS3808G12DBVR, the STM706YM7F delivers integrated watchdog timing, dual-polarity reset outputs, and predictive power-fail detection in a single TSSOP8 package-reducing BOM count and PCB area while enabling higher system reliability in complex embedded applications.
Availability
STM706YM7F is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STM706YM7F 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 specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.
The STM70x series targets robust power-supply monitoring in mission-critical embedded systems, delivering precision reset, watchdog supervision, and power-fail prediction in compact packages for space- and reliability-constrained designs.
FAQ
What is the function of the WDI pin on the STM706YM7F?
The WDI (Watchdog Input) pin monitors MCU activity by detecting rising or falling edges. If no transition occurs within 1.6 s (typ), the internal watchdog timer expires and asserts WDO low. WDI can be left floating to disable the watchdog function, with leakage current limited to ≤10 µA and load capacitance ≤200 pF.
How does the power-fail comparator (PFI/PFO) operate independently of the reset function?
The PFI input connects to an internal 1.25 V comparator (VPFI), separate from the 4.25–4.50 V VRST reset threshold. When PFI voltage drops below VPFI-typically set via external resistor divider-the push-pull PFO output goes low, providing early warning of supply degradation before VCC reaches the reset threshold.
Can STM706YM7F drive a microcontroller reset pin directly without external components?
Yes. Both RST (active-low) and RST (active-high) are push-pull outputs capable of directly driving standard CMOS/TTL reset inputs. No external pull-up or pull-down resistors are needed, and the outputs remain valid down to VCC = 1.0 V, ensuring deterministic reset behavior during brownout conditions.
Is the STM706YM7F qualified for automotive applications?
The STM706YM7F itself is rated for industrial temperature (–40 °C to +85 °C). However, ST offers an automotive-grade variant (STM706M) qualified to –40 °C to +125 °C per AEC-Q100. For automotive designs requiring extended temperature operation, STM706M is the designated qualified part-not STM706YM7F.
STM706YM7F 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:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
STM706YM7F FAQ
1.How can I place an order for STM706YM7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM706YM7F 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 STM706YM7F reliable?
The price and inventory of STM706YM7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM706YM7F is usually 5 days.
3.What payment methods are accepted for STM706YM7F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM706YM7F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM706YM7F?
STM706YM7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM706YM7F 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 STM706YM7F?
For technical support, including STM706YM7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM706YM7F requirements.
6.How does Aetrix verify that STM706YM7F is sourced from the original manufacturer or authorized distributors?
All STM706YM7F 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 STM706YM7F meets industry standards.
7.What is the process for return or replacement of STM706YM7F?
All STM706YM7F units undergo pre-shipment inspection (PSI). If there is an issue with STM706YM7F, 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 STM706YM7F part is unused and in its original packaging.
Return procedure for STM706YM7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM706YM7F Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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