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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:4,013
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Product details
Overview
MAX704SESA 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. It monitors VCC for brownout detection, asserts reset during power-up/down, and switches VOUT to VBATT when VCC falls below 2.40V-enabling reliable CMOS RAM retention in portable controllers.
For engineers reviewing the MAX704SESA datasheet, MAX704SESA pinout, MAX704SESA application, or MAX704SESA equivalent, this device supports critical µP power monitoring, battery-backed embedded systems, and power-fail warning generation with precision voltage thresholds and low-quiescent-current operation.
Technical Context
The MAX704SESA integrates a precision reset comparator with ±4% threshold accuracy, a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power-switching architecture: a 3Ω PMOS switch connects VCC to VOUT during normal operation, while a 140Ω switch engages VBATT-to-VOUT when VCC drops below VSW (2.40V). It guarantees RESET assertion down to VCC = 1V.
Its PFI input monitors external supplies against a 1.237V reference with 10mV hysteresis; PFO asserts low on power-fail or VCC undervoltage. The MR input features a 70µA internal pull-up and triggers reset for ≥100ns low pulse, holding RESET active for 200ms after release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (nominal), ±4% tolerance - sets brownout detection point for 3.3V ±10% systems |
| Reset Timeout Period | 200ms (typical) - ensures µP remains held in reset long enough for stable power recovery |
| VCC Supply Current | 40µA (typical at VCC < 3.6V) - enables ultra-low-power operation in battery-backed applications |
| VBATT Supply Current | 1µA (max) - minimizes battery drain during backup mode |
| Watchdog Timeout | 1.6s - provides fail-safe recovery if µP fails to toggle WDI |
| Battery Switch Threshold | VSW = 2.40V (rising), 25mV hysteresis - initiates switchover before VOUT drops below 2.0V RAM retention limit |
| Power-Fail Input Threshold | VPFT = 1.237V - enables accurate monitoring of auxiliary supplies via resistor divider |
Pinout & Package
MAX704SESA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω switch) based on VCC level; must be decoupled with 0.1µF capacitor |
| 2 - VCC | Main supply input | Accepts 3.02V–5.5V; powers internal circuitry and enables VOUT connection to VCC above reset threshold |
| 3 - GND | Ground reference | Common return for all analog and digital functions; requires low-impedance PCB connection |
| 4 - PFI | Power-fail input | Compares external voltage to 1.237V reference; asserts PFO low when input falls below threshold |
| 5 - PFO | Power-fail output | Open-drain active-low signal indicating power failure or VCC undervoltage; can drive MR on compatible devices |
| 6 - WDI | Watchdog input | Edge-sensitive input; reset triggered if no transition occurs within 1.6s; cannot be disabled |
| 7 - RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, watchdog timeout, or MR activation; guaranteed valid down to VCC = 1V |
| 8 - VBATT | Backup-battery input | Accepts up to 6.0V; connects to VOUT when VCC falls below VSW; may exceed VCC without damage |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.925V ±4% - ensures reliable brownout detection in 3.3V ±10% systems without false resets |
| Guaranteed RESET assertion to VCC = 1V | Enables robust reset hold during deep brownouts where other supervisors lose functionality |
| Battery switchover with 25mV hysteresis | Prevents oscillation during VCC transitions near VSW (2.40V), extending battery life and ensuring clean RAM backup |
| 200ms reset timeout with restart-on-brownout | Each VCC dip below VRST restarts the timer - prevents premature µP release during unstable power conditions |
| 1.6s watchdog timer with edge-clearing | Eliminates need for dedicated watchdog clock; cleared by any WDI transition, supporting flexible µP firmware timing |
Applications
| Battery-Powered Portable Controllers | Critical µP Power Monitoring |
|---|---|
Use Scenario: Handheld medical instruments requiring nonvolatile RAM retention during AC power loss or battery swap. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, automatic VBATT switchover, and controlled RESET assertion. Use Value: Ensures zero data loss in SRAM during 100ms–500ms power interruptions using standard 3.6V lithium coin cells. |
Use Scenario: Industrial PLC modules operating in environments with noisy 3.3V rails subject to transient dips. IC Role / Device Role / Timing Role: Precision voltage monitor asserting RESET for ≥200ms whenever VCC falls below 2.925V. Use Value: Prevents µP code corruption by holding reset until rail stabilizes, with immunity to sub-40µs transients ≥100mV below threshold. |
| Embedded Controllers with Manual Reset | Intelligent Instruments with Power-Fail Warning |
Use Scenario: Field-deployable sensor nodes needing field-serviceable reset via momentary switch. IC Role / Device Role / Timing Role: MR input with 70µA internal pull-up accepts TTL/CMOS logic or mechanical switch; holds RESET for 200ms post-release. Use Value: Eliminates external pull-up resistor and debounce circuitry, reducing BOM count and board area. |
Use Scenario: Test equipment monitoring dual-rail supplies (e.g., +3.3V and +5V) for predictive maintenance alerts. IC Role / Device Role / Timing Role: PFI input configured via resistor divider to detect +5V rail sag; PFO drives interrupt line on µP. Use Value: Provides early warning of failing power stages 10–100ms before main µP reset threshold is breached. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704TEPA | Same functionality and pinout, but in 8-pin PDIP package and 0°C to +70°C temperature range | Suitable for prototyping or through-hole assembly; lacks extended industrial temperature rating | Select when DIP footprint or commercial temp range suffices and SO packaging is not required |
| MAX802SESA | Tighter reset threshold tolerance (±2% vs. ±4%) and improved PFI accuracy (±2% vs. ±4%) | Better suited for high-precision 3.3V systems where tighter supply margin control is mandatory | Choose when design requires enhanced voltage-monitoring accuracy without changing layout or firmware |
Compared with MAX704SESA, MAX704TEPA offers identical electrical behavior in a through-hole package for lab use, while MAX802SESA delivers higher threshold precision for mission-critical power monitoring-neither is pin-compatible with MAX704SESA's SO package, but both share identical pin functions and interface logic.
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 and long-term production cycles.
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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX704 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power-up/down sequencing, brownout protection, and battery-backed memory retention in 3.0V/3.3V embedded systems.
FAQ
What is the guaranteed minimum VCC voltage at which MAX704SESA asserts RESET?
MAX704SESA guarantees RESET assertion for VCC down to 1V, regardless of VBATT state. This ensures fail-safe reset hold during deep brownouts where many competing supervisors cease operation. The device maintains RESET low as long as VCC remains below its 2.925V threshold or until the 200ms timeout expires after VCC recovery - a key reliability feature confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Does MAX704SESA support battery voltages higher than VCC?
Yes, MAX704SESA explicitly supports VBATT exceeding VCC - a core design feature enabling use with standard 3.6V lithium batteries in 3.3V systems. The internal battery switchover circuit activates when VCC falls below VSW (2.40V), connecting VBATT to VOUT through a 140Ω switch. This capability is documented in the General Description, Backup-Battery Switchover section, and Absolute Maximum Ratings (VBATT: –0.3V to +6.0V).
How does the watchdog timer in MAX704SESA behave during RESET assertion?
During RESET assertion, the MAX704SESA watchdog timer remains cleared and does not count - preventing spurious timeouts. It only begins timing once RESET deasserts, requiring a WDI edge transition within 1.6s to avoid reset retriggering. This behavior is specified in the Watchdog Input section and confirmed by the timing diagram (Figure 2), ensuring deterministic recovery after power-up or manual reset events.
Can MAX704SESA operate without a backup battery connected?
Yes, MAX704SESA can operate without VBATT: connect both VBATT and VOUT pins to VCC. However, battery-switchover and RAM backup functionality are disabled. The device retains full reset supervision, watchdog, and power-fail monitoring capabilities. This configuration is validated in the Applications Information section under "Operation without a Backup Power Source" and supported by the Pin Description table showing VOUT connected to VCC when no battery is used.
What is the function of the PFI and PFO pins on MAX704SESA?
PFI is a dedicated input compared to a 1.237V internal reference; when PFI voltage falls below this threshold, PFO - an open-drain active-low output - pulls low. This pair enables monitoring of auxiliary supplies (e.g., +5V rail) via resistor divider. PFO can also be tied to MR on MAX704SESA to generate reset on power-fail, as shown in Figure 5b of the datasheet - a verified dual-use function confirmed across Electrical Characteristics and Applications Information sections.
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:
- Obsolete
- 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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