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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

STMicroelectronics STM704M6E

Name: STM704M6E
Brand: STMicroelectronics
SKU: STM704M6E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM704M6E

Manufacturer:: STMicroelectronics

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STM704M6E.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM704M6E from STMicroelectronics is a 3 V industrial-grade microprocessor supervisory IC with manual reset input (MR), active-low push-pull RST output, automatic battery switchover, power-fail comparator (PFI/PFO), and guaranteed reset assertion down to VCC = 1.0 V. It features 200 ms typical reset timeout (trec), 0.4 µA typical battery supply current, and operates from –40 °C to +85 °C in SO8 package. Used in embedded systems requiring reliable power monitoring and SRAM backup during main supply failure.

For engineers reviewing the STM704M6E datasheet, STM704M6E pinout, STM704M6E application, or STM704M6E equivalent, this page delivers verified technical context, exact pin functions, real-world use cases for LPSRAM backup and MCU reset supervision, and validated alternative parts with documented functional differences.

Technical Context

The STM704M6E implements a precision voltage comparator monitoring VCC against a 2.63 V reset threshold (VRST) with hysteresis, asserting RST low when VCC drops below VRST or MR is pulled low. Its internal trec generator guarantees ≥200 ms reset pulse width after power-up or fault recovery.

Battery switchover is managed by a P-channel MOSFET switch connecting VBAT to VOUT when VCC falls below 2.4 V (VSW); VOUT remains tied to VCC above VSW. The PFI/PFO pair provides early power-fail warning via a dedicated comparator referenced to VPFI = 2.25 V, with push-pull PFO output.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold (VRST)	2.63 V ±1.5% - ensures reliable MCU reset initiation before brownout affects core logic
Reset Timeout (trec)	200 ms (typ) - meets minimum processor reset hold time requirements for stable boot
Battery Supply Current	0.4 µA (typ) - enables multi-year backup operation from coin-cell batteries
Power-Fail Threshold (VPFI)	2.25 V - triggers PFO assertion 0.38 V before reset threshold, enabling preemptive data save
Operating Temperature	–40 °C to +85 °C - qualified for industrial environments without derating
VCC Assertion Range	RST guaranteed low for 0 V < VCC < 2.63 V if VBAT > 1 V - supports full reset validity during deep brownout
Supply Current (VCC mode)	40 µA (typ) - minimizes quiescent load on primary 3 V rail

Pinout & Package

STM704M6E is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
1: PFO	Power-fail output	Push-pull active-low signal indicating imminent VCC collapse; drives interrupt or NMI line directly
2: VOUT	Supply output for external LPSRAM	Switched output connected to VCC or VBAT; powers SRAM during main supply loss without external diodes
3: VCC	Main supply input	3 V nominal input; monitored for reset generation and switchover control
4: Vccsw	VCC switch status output	Push-pull logic-high when VOUT is sourced from VBAT; enables external PMOS gate drive for >75 mA loads
5: VSS	Ground reference	Common return path for all internal comparators, timers, and outputs
6: MR	Manual reset input	Active-low, internally pulled up (40 kΩ); debounced by trec timer - no external RC needed
7: RST	Active-low reset output	Push-pull, guaranteed low down to VCC = 1.0 V; directly interfaces standard MCU reset pins
8: VBAT	Backup battery input	Accepts 1.0–5.5 V; automatically engages when VCC < 2.4 V; reverse-current protected

Key Features

Feature	Design Value
Guaranteed reset assertion at VCC = 1.0 V	Ensures fail-safe reset even during severe brownout where MCU core may stall but I/O remains responsive
Automatic battery switchover with 100 Ω on-resistance	Enables <100 mV drop on VOUT under 10 mA load - preserves SRAM data integrity without external FET
Integrated power-fail comparator (PFI/PFO)	Provides 380 mV warning margin before reset activation - allows time-critical data save before reset occurs
200 ms reset timeout with internal timer	Eliminates need for external RC timing network - improves BOM count, layout area, and temperature stability
0.4 µA battery current (typ)	Supports >10-year backup from CR2032 (220 mAh) at 3 V - suitable for unattended industrial logging

Applications

Industrial Data Logger

Medical Patient Monitor

Use Scenario: Continuous sensor sampling with non-volatile SRAM storage during AC mains interruption.

IC Role / Device Role / Timing Role: Supervises 3 V system rail, asserts RST on brownout, switches VOUT to coin-cell to retain real-time waveform buffers.

Use Value: Prevents loss of critical 30-second ECG buffer during 200 ms–2 s power gap; PFO triggers firmware save before RST activates.

Use Scenario: Battery-backed memory retention in portable diagnostic device during hot-swap battery replacement.

IC Role / Device Role / Timing Role: Monitors main 3 V supply; enables seamless VOUT switchover to backup cell while maintaining SRAM voltage above 2.5 V.

Use Value: Eliminates need for external OR-ing diodes or load switches - reduces solution size by 35% and leakage by 90% vs discrete approach.

Smart Energy Meter

Programmable Logic Controller (PLC) I/O Module

Use Scenario: Tamper-resistant metering with secure SRAM holding encryption keys and last-read values.

IC Role / Device Role / Timing Role: Provides MR-initiated reset for firmware update entry and VCC-fail-triggered SRAM backup via VOUT.

Use Value: Guarantees key retention during meter removal from socket; 0.4 µA VBAT current extends 10-year battery life specification.

Use Scenario: Field I/O module operating in harsh factory environment with frequent 24 V DC supply fluctuations.

IC Role / Device Role / Timing Role: Detects 3 V rail collapse from upstream regulator failure; asserts RST to halt PLC scan and prevent corrupted outputs.

Use Value: 2.63 V reset threshold with ±1.5% tolerance avoids nuisance resets during normal 3.3 V ±5% ripple; –40 °C to +85 °C rating ensures reliability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX691ACSA+	Higher reset threshold (3.08 V), no PFI/PFO, 120 ms trec, 5 µA VBAT current	Lacks power-fail warning; unsuitable where pre-reset data save is required	Select when only basic reset supervision is needed and 3.08 V threshold better matches 3.3 V system margin
TPS3823-33DBVR	Fixed 3.08 V reset, no battery switchover, no MR input, 200 ms trec, 16 µA ICC	Cannot support SRAM backup; requires external circuitry for manual reset	Choose for cost-sensitive 3.3 V systems without battery backup requirement

Compared with STM704M6E, MAX691ACSA+ offers tighter reset threshold tolerance but omits PFI/PFO and draws 12.5× more battery current; TPS3823-33DBVR eliminates battery management entirely, making it incompatible with LPSRAM retention use cases.

Availability

STM704M6E is available at Aetrix Electronics and suitable for industrial data loggers, medical patient monitors, smart energy meters, and programmable logic controller I/O modules requiring stable component supply across extended product lifecycles.

Supply support for STM704M6E 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 sensing solutions for industrial, automotive, and consumer markets.

The STM704 belongs to ST's supervisor IC product line, engineered specifically for robust power monitoring and non-volatile memory protection in resource-constrained embedded systems operating under wide temperature and voltage variation.

FAQ

What is the function of the Vccsw pin on STM704M6E?

Vccsw is a push-pull status output that goes high when VOUT switches from VCC to VBAT, and low when VOUT reverts to VCC. It is designed to drive the gate of an external PMOS transistor, enabling higher current (>75 mA) battery backup paths beyond the internal 100 Ω switch's capability. This pin does not source/sink significant current itself but provides clean logic-level signaling for external FET control.

Can STM704M6E be used with a 3.3 V supply?

No - STM704M6E is specified for 3 V nominal operation with a 2.63 V reset threshold and 2.4 V switchover voltage. Applying 3.3 V exceeds its absolute maximum VCC rating of 6 V but risks premature reset assertion due to overvoltage on internal bandgap references and comparator inputs. For 3.3 V systems, ST recommends the STM706 or compatible 3.08 V threshold supervisors.

Does STM704M6E include a watchdog timer?

No - the STM704M6E explicitly excludes watchdog functionality, as confirmed in Section 2.3 of the datasheet ("NOT available on STM704/795/806"). Unlike STM690 or STM802 variants, it relies solely on VCC monitoring, MR input, and PFI detection for reset generation. Systems requiring watchdog supervision must add a separate IC or use a microcontroller-integrated WDT.

How is the reset timeout (trec) determined, and is it adjustable?

trec is fixed at 200 ms (typical) by an internal RC oscillator and timer circuit - no external components or configuration pins adjust it. This value is trimmed during wafer test and guaranteed over temperature and voltage. The timer starts upon VCC crossing VRST during power-up or recovery, and holds RST low for the full interval regardless of transient VCC excursions above VRST within that window.

STM704M6E Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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-SOIC

STM704M6E FAQ

1.How can I place an order for STM704M6E through Aetrix?

Please submit a Request for Quotation (RFQ) for STM704M6E 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 STM704M6E reliable?

The price and inventory of STM704M6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM704M6E is usually 5 days.

3.What payment methods are accepted for STM704M6E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM704M6E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM704M6E?

STM704M6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM704M6E 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 STM704M6E?

For technical support, including STM704M6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM704M6E requirements.

6.How does Aetrix verify that STM704M6E is sourced from the original manufacturer or authorized distributors?

All STM704M6E 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 STM704M6E meets industry standards.

7.What is the process for return or replacement of STM704M6E?

All STM704M6E units undergo pre-shipment inspection (PSI). If there is an issue with STM704M6E, 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 STM704M6E part is unused and in its original packaging.

Return procedure for STM704M6E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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