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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:1,651
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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, key selection criteria include reset threshold accuracy (±4%), VCC supply current (40µA typical), battery leakage (≤1µA), guaranteed RESET assertion down to VCC = 1V, and SO-8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The MAX704SESA-T integrates a precision voltage monitor, 200ms reset timer, 1.6s watchdog timer with edge-triggered clear, manual reset input with internal 70µA pull-up, and bidirectional battery switchover circuitry that connects VBATT to VOUT when VCC falls below 2.40V (VSW) while ensuring CMOS RAM retention down to 2.0V.
It features an open-drain PFO output tied to a 1.237V power-fail comparator with ±75mV threshold accuracy, supports VCC operation from 3.02V to 5.5V, and guarantees valid RESET assertion even during brownout conditions where VCC drops as low as 1.0V-enabling robust system recovery without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (nominal), ±4% tolerance - ensures reset assertion before VCC falls below 2.85V in 3.3V ±10% systems |
| Reset Timeout Period | 200ms (typical), 140–280ms over temperature - provides sufficient hold time for µP initialization after power-up or brownout |
| VCC Supply Current | 40µA (typical at VCC < 3.6V) - enables ultra-low-power operation in battery-backed applications |
| Battery Supply Current | ≤1µA (max over temp) - minimizes backup battery drain during long-term storage or standby |
| Watchdog Timeout | 1.6s (typical), 1.12–2.24s over temperature - detects µP lockup without requiring software intervention |
| VBATT-to-VOUT Switch On-Resistance | 140Ω (typical at 25°C) - limits voltage drop during battery switchover to preserve RAM data integrity |
| Power-Fail Threshold Accuracy | ±75mV - supports accurate undervoltage detection for auxiliary supply monitoring |
Pinout & Package
MAX704SESA-T is housed in an 8-pin SOIC (SO-8) package with standard 1.27mm pitch, RoHS-compliant lead-free construction (indicated by "+" suffix), and thermal performance rated for 471mW continuous dissipation at +70°C (derating 5.88mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Supply output for CMOS RAM | Switches between VCC and VBATT via internal PMOS; connects to VBATT only when VCC < VSW (2.40V) and VBATT > VCC |
| VCC | Main supply input | Accepts 3.02V–5.5V; powers internal circuitry and enables VOUT-to-VCC connection above reset threshold |
| GND | Ground reference | Common return path for all analog and digital functions; substrate tied to higher of VCC/VBATT |
| PFI | Power-fail input | Compares against 1.237V reference; asserts PFO low when input falls below VPFT or VCC drops below VSW |
| PFO | Power-fail output | Open-drain output signaling undervoltage condition; can be wired to MR on MAX704/806 to trigger reset |
| WDI | Watchdog input | Edge-sensitive input; clears 1.6s timer on rising/falling transition; cannot be disabled |
| RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, watchdog timeout, or MR activation; holds low ≥200ms |
| VBATT | Backup-battery input | Supports VBATT > VCC (e.g., 3.6V Li cell); enables seamless RAM backup without external diodes or switches |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset behavior even during deep brownout, eliminating need for external reset extenders |
| Battery switchover with 2.40V switch threshold (VSW) | Enters battery mode before VOUT drops below 2.0V, preserving CMOS RAM data integrity without external supervision |
| 200ms reset timeout with hysteresis | Prevents oscillation during slow-rising VCC by holding RESET low until stable supply is confirmed |
| Manual reset input with internal 70µA pull-up | Eliminates need for external pull-up resistor; compatible with TTL/CMOS logic and momentary switches |
| 1.237V power-fail comparator with 10mV hysteresis | Enables accurate monitoring of secondary supplies (e.g., analog rails) using simple resistor dividers |
Applications
| Battery-Powered Embedded Controllers | Intelligent Portable Instruments |
|---|---|
Use Scenario: Handheld test equipment powered by lithium coin cell with 3.3V main rail and static RAM for calibration data storage. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery switchover, and watchdog monitoring during intermittent operation. Use Value: Prevents corrupted RAM writes during low-VCC events; extends battery life via 40µA VCC current and ≤1µA battery leakage. |
Use Scenario: Portable gas analyzer with µP-based signal processing, real-time display, and nonvolatile memory backed by supercapacitor. IC Role / Device Role / Timing Role: Power supervisor managing VCC/VBATT transitions, issuing 200ms reset pulses on startup, and detecting supply faults via PFI. Use Value: Guarantees deterministic µP boot sequence and preserves sensor calibration data during brief AC dropout or battery depletion. |
| Critical µP Power Monitoring | Industrial Remote Sensor Nodes |
Use Scenario: Programmable logic controller (PLC) I/O module requiring fault-tolerant reset signaling and immunity to VCC transients. IC Role / Device Role / Timing Role: Reset generator with 100mV-overdrive immunity (40µs max glitch rejection) and 2.925V threshold aligned to 3.3V ±10% spec. Use Value: Avoids spurious resets from EMI-induced VCC noise while asserting reset reliably during true brownout conditions. |
Use Scenario: Wireless environmental sensor node operating on primary battery with periodic wake-up and data transmission cycles. IC Role / Device Role / Timing Role: Low-power supervisor enabling watchdog timeout detection (1.6s) and battery-backed RAM retention during sleep. Use Value: Detects firmware hangs without increasing average current; maintains configuration state across multi-year deployments. |
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 specs, but in 8-pin PDIP package with 0°C to +70°C temperature range | Suitable for prototyping or legacy through-hole designs; lacks extended industrial temperature support | Select MAX704TEPA+ only if DIP footprint and commercial temp range meet design requirements |
| MAX706SESA+ | No watchdog timer; no manual reset input; same 2.925V reset threshold and SO-8 package | Targeted at simpler systems where watchdog or MR functionality is unnecessary | Choose MAX706SESA+ when reduced feature set suffices and cost optimization is critical |
Compared with MAX704TEPA+, the MAX704SESA-T offers wider temperature range and surface-mount compatibility; compared with MAX706SESA+, it adds essential watchdog and manual reset capabilities required for autonomous embedded systems.
Availability
MAX704SESA-T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply across industrial temperature environments.
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, communications, and computing applications.
The MAX704 series belongs to Maxim's microprocessor supervisory product line, designed specifically to replace discrete reset circuits in 3.0V/3.3V systems while integrating reset generation, battery switchover, watchdog, and power-fail detection.
FAQ
What is the exact reset threshold voltage of the MAX704SESA-T?
The MAX704SESA-T has a nominal reset threshold voltage of 2.925V, with a tolerance of ±4% over temperature and supply variations. This value is specified for VCC falling conditions and ensures reset assertion before VCC drops below 2.85V in 3.3V ±10% systems. The rising threshold is slightly higher (2.935V typ) due to built-in hysteresis to prevent chatter during recovery.
Does the MAX704SESA-T support battery-backup operation with VBATT exceeding VCC?
Yes, the MAX704SESA-T explicitly supports VBATT > VCC operation-such as a 3.6V lithium battery with a 3.3V main supply. Its internal battery switchover circuit activates when VCC falls below 2.40V (VSW) and VBATT exceeds VCC, connecting VBATT to VOUT through a 140Ω switch. This allows seamless RAM backup without external diodes or level-shifting components.
Can the watchdog timer in the MAX704SESA-T be disabled?
No, the watchdog timer in the MAX704SESA-T cannot be disabled. It is a fixed-function block that triggers a reset pulse if the WDI input remains static (high or low) for longer than 1.6 seconds. The timer clears only on rising or falling edges at WDI or during active RESET assertion-ensuring continuous fault detection without software dependency.
What is the maximum VCC supply voltage range supported by the MAX704SESA-T?
The MAX704SESA-T supports a VCC supply voltage range of 3.02V to 5.5V. This wide range accommodates both 3.3V nominal systems (with ±10% tolerance) and legacy 5V interfaces, while maintaining full functionality including reset generation, watchdog timing, and battery switchover. Operation below 3.02V may result in undefined behavior or failure to assert RESET.
How does the MAX704SESA-T handle power-fail detection without a dedicated PFI voltage source?
When the PFI input is unused, the MAX704SESA-T requires PFI to be connected to GND to disable the power-fail comparator and prevent floating-input noise from falsely triggering PFO. Leaving PFI unconnected risks erratic PFO behavior. If monitoring is needed, a resistor divider from VCC or another supply to PFI sets the trip point relative to the internal 1.237V reference.
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:
- 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-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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