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Analog Devices Inc./Maxim Integrated MAX704SESA+
- Part No.:
- MAX704SESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704SESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,147
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Product details
Overview
MAX704SESA+ from Maxim Integrated is a 3.3V/3.0V microprocessor supervisory circuit with active-low RESET output, precision 2.925V reset threshold (±4%), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover-designed for embedded controllers and battery-powered systems requiring reliable power monitoring and brownout protection.
For engineers reviewing the MAX704SESA+ datasheet, MAX704SESA+ pinout, MAX704SESA+ application, or MAX704SESA+ equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in RAM backup and power-fail warning, and two validated alternative parts with documented functional differences.
Technical Context
The MAX704SESA+ integrates a precision voltage monitor, 1.6s watchdog timer with edge-triggered clear, manual reset input (MR) with internal 70µA pull-up, and dual-path power switching: VCC-to-VOUT via 3Ω PMOS and VBATT-to-VOUT via 140Ω switch. It asserts RESET low during VCC < 2.925V, MR low, or watchdog timeout.
Its battery switchover logic activates when VCC falls below VSW = 2.40V (typ) while VBATT > VCC, ensuring CMOS RAM retention before VOUT drops below 2.0V; recovery reconnects VOUT to VCC only after VCC rises above the reset threshold-not at VSW-to guarantee supply stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V ±4% (VCC falling); ensures reset assertion before 2.85V and no false trigger above 3.00V in 3.3V ±10% systems |
| Reset Timeout Period | 200ms (typ); guarantees µP remains held in reset long enough for stable power rail recovery |
| Watchdog Timeout | 1.6s ±40%; clears on any WDI edge and triggers reset if no activity exceeds timeout |
| VCC Supply Current | 40µA (typ, VCC < 3.6V); enables ultra-low-power operation in always-on battery-backed applications |
| Battery Supply Current | 0.4–1µA (max); minimizes drain on lithium backup cells during extended standby |
| VBATT-to-VOUT On-Resistance | 140Ω (typ); limits voltage drop under 1mA load to <140mV, preserving RAM data integrity |
| Power-Fail Input Threshold | 1.237V ±25mV; provides accurate undervoltage detection for auxiliary rails via external divider |
Pinout & Package
MAX704SESA+ is housed in an 8-pin SOIC package (SO) with gull-wing leads, RoHS-compliant (indicated by '+' suffix), and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω switch); must be decoupled with 0.1µF capacitor |
| 2 - VCC | Main system supply input | Accepts 3.02V–5.5V; powers internal circuitry and sources VOUT when active; absolute max = +6.0V |
| 3 - GND | Ground reference | Common return for all analog and digital functions; substrate tied to higher of VCC/VBATT |
| 4 - PFI | Power-fail comparator input | Monitors auxiliary rail via resistor divider; trips at 1.237V; hysteresis = 10–20mV |
| 5 - PFO | Power-fail open-drain output | Asserts low when PFI < 1.237V or VCC < VSW; can drive MR on same device for cascaded reset |
| 6 - WDI | Watchdog timer input | Edge-sensitive (rising/falling); resets internal 1.6s timer; cannot be disabled |
| 7 - RESET | Active-low reset output | Push-pull, guaranteed low for VCC < 1V; holds µP in reset for full 200ms after threshold crossing |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; may exceed VCC; connects to VOUT during brownout; leakage < 0.5µA |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.925V ±4% with 10mV hysteresis prevents oscillation during slow VCC ramp-down |
| Battery switchover control | VCC-to-VBATT transition at 2.40V ensures RAM retains data down to ≥2.0V; recovery deferred until VCC > VRST |
| Guaranteed RESET assertion | Valid down to VCC = 1V-critical for brownout detection in low-voltage systems |
| Low quiescent current | 40µA VCC supply current enables multi-year battery life in portable instruments |
| Integrated watchdog timer | 1.6s timeout with edge-triggered clear eliminates need for external timing components |
Applications
| Battery-Powered Embedded Controller | Intelligent Instrument with RAM Backup |
|---|---|
Use Scenario: Portable gas detector operating on coin-cell battery with volatile SRAM storing calibration data. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and switches RAM supply to 3.6V lithium cell during brownout. Use Value: Ensures RAM data retention for >24 hours during power loss using 2.925V threshold and 140Ω VBATT switch resistance. |
Use Scenario: Handheld multimeter with EEPROM and static RAM for measurement history and settings. IC Role / Device Role / Timing Role: Provides 200ms power-on reset pulse and detects VCC sag below 2.925V during battery depletion. Use Value: Prevents corrupted EEPROM writes by holding µP in reset until supply stabilizes post-brownout. |
| Critical µP Power Monitoring | Portable Medical Device |
Use Scenario: Industrial PLC controller requiring fail-safe boot sequence and watchdog supervision. IC Role / Device Role / Timing Role: Generates active-low RESET signal and monitors µP activity via WDI pin. Use Value: 1.6s watchdog timeout catches firmware hangs; 200ms reset pulse meets ARM Cortex-M boot timing requirements. |
Use Scenario: Wearable ECG monitor powered by rechargeable Li-ion with backup supercapacitor. IC Role / Device Role / Timing Role: Uses PFI input to monitor 1.8V analog rail and assert PFO to trigger system shutdown. Use Value: 1.237V PFI threshold enables precise undervoltage detection for analog front-end stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704TESA+ | Reset threshold = 3.075V ±4%; identical pinout, timing, and features | Suitable for 3.3V ±5% systems where tighter supply tolerance requires earlier reset assertion | Select when system VCC must not fall below 3.00V before reset activation |
| MAX802SESA+ | Reset threshold = 2.925V ±2% (tighter tolerance); adds PFI hysteresis = ±2% | Preferred for high-accuracy power-fail detection in medical or test equipment | Choose when ±2% reset accuracy and enhanced noise immunity on PFI are required |
Compared with MAX704SESA+, MAX704TESA+ raises reset threshold by 150mV for stricter 3.3V systems, while MAX802SESA+ improves reset accuracy to ±2% and tightens PFI hysteresis-making it suitable for safety-critical applications demanding higher precision.
Availability
MAX704SESA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and intelligent instruments requiring stable component supply across industrial temperature ranges (-40°C to +85°C).
Supply support for MAX704SESA+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX704 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power monitoring, reset generation, and battery backup control in 3.0V/3.3V embedded systems.
FAQ
What is the exact reset threshold voltage for MAX704SESA+?
The MAX704SESA+ has a nominal reset threshold of 2.925V with ±4% tolerance over temperature. It asserts RESET low when VCC falls below 2.85V (min) and guarantees no false reset above 3.00V (max) in normal operation-optimized for 3.3V ±10% power supplies.
Does MAX704SESA+ support battery backup with lithium cells exceeding VCC?
Yes, MAX704SESA+ supports VBATT > VCC operation: its internal battery switchover circuit activates when VCC falls below 2.40V (VSW) while VBATT > VCC, allowing 3.6V lithium cells to power VOUT without diode drop-enabling full RAM data retention during main supply failure.
Can the watchdog timer in MAX704SESA+ be disabled?
No, the watchdog timer in MAX704SESA+ cannot be disabled. It operates continuously with a 1.6s timeout and resets only on rising or falling edges at the WDI pin. This design ensures fail-safe µP supervision even if firmware fails to service the watchdog.
What is the function of the PFI and PFO pins on MAX704SESA+?
On MAX704SESA+, PFI is a dedicated input for monitoring auxiliary power rails via resistor divider (trip point = 1.237V), and PFO is an open-drain output that goes low when PFI < 1.237V or VCC < VSW-enabling power-fail interrupts or cascaded reset triggering via MR connection.
Is MAX704SESA+ pin-compatible with other devices in the MAX704 family?
Yes, MAX704SESA+ is fully pin-compatible with all MAX704x variants (T/R/S suffixes) and shares identical 8-pin SOIC footprint, pinout, and electrical interface-allowing direct substitution within the same temperature grade (E-grade, -40°C to +85°C) without PCB changes.
MAX704SESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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
MAX704SESA+ FAQ
1.How can I place an order for MAX704SESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704SESA+ 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 MAX704SESA+ reliable?
The price and inventory of MAX704SESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704SESA+ is usually 5 days.
3.What payment methods are accepted for MAX704SESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704SESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704SESA+?
MAX704SESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704SESA+ 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 MAX704SESA+?
For technical support, including MAX704SESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704SESA+ requirements.
6.How does Aetrix verify that MAX704SESA+ is sourced from the original manufacturer or authorized distributors?
All MAX704SESA+ 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 MAX704SESA+ meets industry standards.
7.What is the process for return or replacement of MAX704SESA+?
All MAX704SESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX704SESA+, 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 MAX704SESA+ part is unused and in its original packaging.
Return procedure for MAX704SESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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