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Analog Devices Inc./Maxim Integrated MAX704SESA+T
- Part No.:
- MAX704SESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX704SESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,744
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Product details
Overview
MAX704SESA+T from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-low RESET output, 2.925V reset threshold, 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover-designed for reliable power monitoring in embedded controllers and battery-powered systems.
For engineers reviewing the MAX704SESA+T datasheet, MAX704SESA+T pinout, MAX704SESA+T application, or MAX704SESA+T equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in RAM backup and brownout protection, and two technically documented alternative parts for 3.3V µP supervision.
Technical Context
The MAX704SESA+T integrates a precision voltage monitor with ±4% reset threshold accuracy, a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power switch enabling VOUT to seamlessly transition between VCC and VBATT when VCC falls below 2.40V (VSW) while VBATT > VCC.
It features guaranteed RESET assertion down to VCC = 1V, 40µA VCC supply current at +25°C, and 1µA battery supply current-enabling long-term CMOS RAM retention during main supply failure without compromising system startup integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (nominal), ±4% tolerance - ensures reliable reset assertion before 3.3V supply drops below 2.85V under worst-case conditions. |
| Reset Timeout Period | 200ms (typical) - guarantees sufficient hold time for µP initialization after power-up or brownout recovery. |
| Watchdog Timeout | 1.6s - detects µP lockup by requiring periodic WDI toggling; resets if no edge occurs within window. |
| VCC Supply Current | 40µA (typical, VCC < 3.6V) - enables ultra-low-power operation in always-on supervision circuits. |
| Battery Supply Current | 1µA (max, -40°C to +85°C) - minimizes drain on lithium backup cells during extended standby. |
| VBATT-to-VOUT Switch Resistance | 140Ω (typical) - limits voltage drop and power loss when switching to battery backup mode. |
| Power-Fail Comparator Threshold | 1.237V ±20mV - provides accurate undervoltage detection for auxiliary supplies via PFI input. |
Pinout & Package
MAX704SESA+T is housed in an 8-pin SOIC package (SO-8, 150mil width), RoHS-compliant with lead-free finish (+ suffix). Pinout is electrically identical across MAX704T/S/R variants and validated per Maxim's official datasheet revision 3 (2015).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Supply output for CMOS RAM | Switches between VCC and VBATT; connects to VCC when VCC > VSW, to VBATT when VCC < VSW and VBATT > VCC. |
| VCC | Main supply input | Primary 3.0V/3.3V system rail; powers internal circuitry and enables VOUT sourcing when valid. |
| GND | Ground reference | Common return path for all analog and digital functions; substrate tied to higher of VCC/VBATT. |
| PFI | Power-fail input | Monitors external supply via resistor divider; asserts PFO low when voltage falls below 1.237V. |
| PFO | Power-fail output | Open-drain logic-low signal indicating PFI undervoltage or VCC falling below VSW. |
| WDI | Watchdog input | Edge-sensitive input; clearing pulse must occur every 1.6s to prevent watchdog-triggered reset. |
| RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, MR activation, or watchdog timeout. |
| VBATT | Backup-battery input | Accepts up to 6.0V; enables seamless switchover to battery when VCC fails, even if VBATT > VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset behavior during deep brownouts where supply collapses below typical logic thresholds. |
| Battery can exceed VCC in normal operation | Supports standard 3.6V lithium coin cells without external level-shifting or clamping circuitry. |
| 200ms reset time delay with internal timer | Eliminates need for external RC timing components-reducing BOM count and layout complexity. |
| 40µA VCC supply current (typ) | Extends battery life in portable equipment by minimizing quiescent draw during supervision-only operation. |
| Manual reset input with 70µA internal pull-up | Enables direct switch-to-ground connection without external biasing; debouncing handled internally. |
Applications
| Battery-Powered Embedded Controller | RAM Data Retention System |
|---|---|
|
Use Scenario: Industrial sensor node operating on lithium primary cell with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail, triggers reset on brownout, and switches VOUT to VBATT to preserve SRAM contents during sleep. Use Value: Prevents data corruption during power dips; enables 10+ year battery life via 1µA battery leakage current. |
Use Scenario: Medical handheld device storing calibration data in static RAM during power-off. IC Role / Device Role / Timing Role: Provides battery-backed VOUT with 140Ω switchover resistance and 200ms reset hold time for safe µP boot sequence. Use Value: Guarantees RAM retention down to 2.0V VOUT; eliminates need for external PMOS switch or diode OR-ing. |
| Critical µP Power Monitoring | Portable Test Instrument |
|
Use Scenario: Field-deployable PLC controller subject to unstable 3.3V DC input from solar-charged battery. IC Role / Device Role / Timing Role: Monitors VCC with ±4% reset threshold accuracy and 100mV glitch immunity to suppress false resets. Use Value: Reduces spurious reboots by 92% vs. discrete supervisor solutions; supports operation from 2.72V to 5.5V VCC range. |
Use Scenario: Handheld oscilloscope with real-time waveform buffer requiring nonvolatile memory backup. IC Role / Device Role / Timing Role: Integrates watchdog timer (1.6s timeout), manual reset, and PFI-based auxiliary supply monitoring. Use Value: Detects µP lockup and secondary rail faults simultaneously-eliminating separate fault-detection ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704TEPA+ | Same functionality but in 8-pin PDIP package; wider temperature range (0°C to +70°C vs. -40°C to +85°C for MAX704SESA+T). | Preferred for prototyping or through-hole assembly; lacks extended industrial temperature rating. | Select MAX704TEPA+ only when DIP footprint is required and ambient operating temperature stays within commercial range. |
| MAX802SESA+ | Tighter reset threshold tolerance (±2% vs. ±4%) and improved PFI comparator accuracy (±2% vs. ±4%). | Better suited for high-precision 3.3V systems where supply margin is constrained to <100mV. | Choose MAX802SESA+ when design requires tighter voltage monitoring specs without changing PCB layout. |
Compared with MAX704TEPA+, MAX704SESA+T offers extended temperature support and SOIC packaging for space-constrained designs; compared with MAX802SESA+, it trades tighter tolerances for lower cost and broader legacy compatibility in standard 3.3V µP systems.
Availability
MAX704SESA+T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and critical µP power monitoring requiring stable component supply across industrial temperature ranges.
Supply support for MAX704SESA+T 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) is a semiconductor company specializing in high-performance 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 robust, low-power 3.0V/3.3V system monitoring with integrated battery switchover and watchdog functionality.
FAQ
What is the reset threshold voltage of the MAX704SESA+T?
The MAX704SESA+T has a nominal reset threshold voltage of 2.925V, with ±4% tolerance over temperature. This value is specified for VCC falling conditions and ensures reset assertion before the 3.3V supply drops below 2.85V, making it suitable for systems with ±10% supply tolerance.
Does the MAX704SESA+T support battery backup with VBATT higher than VCC?
Yes, the MAX704SESA+T explicitly supports VBATT exceeding VCC-up to 6.0V-during normal operation. Its internal battery switchover circuit activates when VCC falls below 2.40V (VSW) and VBATT > VCC, connecting VBATT to VOUT through a 140Ω switch to maintain RAM power.
How does the watchdog timer function in the MAX704SESA+T?
The MAX704SESA+T watchdog timer has a fixed 1.6s timeout period. It clears on any rising or falling edge at the WDI pin and triggers a reset if no edge occurs within that window. Unlike some variants, the watchdog cannot be disabled and remains active whenever VCC is valid.
What is the purpose of the PFI and PFO pins on the MAX704SESA+T?
The PFI pin accepts an external voltage for undervoltage detection, comparing it to a 1.237V internal reference. When PFI falls below this threshold-or when VCC drops below VSW-the open-drain PFO pin pulls low, signaling a power-fail condition usable for interrupts or cascaded reset generation.
Can the MAX704SESA+T operate without a backup battery?
Yes, the MAX704SESA+T can operate without a backup battery: connect both VBATT and VOUT to VCC. However, doing so disables battery switchover and RAM backup functionality. For pure supervision without backup, alternatives like MAX706SESA+ may be more appropriate.
MAX704SESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX704SESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX704SESA+T 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+T reliable?
The price and inventory of MAX704SESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX704SESA+T is usually 5 days.
3.What payment methods are accepted for MAX704SESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX704SESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX704SESA+T?
MAX704SESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX704SESA+T 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+T?
For technical support, including MAX704SESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX704SESA+T requirements.
6.How does Aetrix verify that MAX704SESA+T is sourced from the original manufacturer or authorized distributors?
All MAX704SESA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX704SESA+T?
All MAX704SESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX704SESA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX704SESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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