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Analog Devices Inc./Maxim Integrated MAX708SESA+
- Part No.:
- MAX708SESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708SESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,952
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Product details
Overview
MAX708SESA+ from Maxim Integrated is a +3V microprocessor supervisory circuit providing dual active-high and active-low reset outputs, 2.93V precision supply-voltage monitoring, 200ms reset pulse width, and power-fail warning via 1.25V PFI comparator - used in battery-powered portable instruments and industrial controllers to ensure reliable µP startup and brownout recovery.
For engineers reviewing the MAX708SESA+ datasheet, MAX708SESA+ pinout, MAX708SESA+ application, or MAX708SESA+ equivalent, key selection criteria include its dual-reset capability (RESET and RESET), absence of watchdog timer, −40°C to +85°C industrial temperature range, SO-8 package, and compatibility with +3V/+3.3V systems requiring guaranteed reset assertion down to VCC = 1V.
Technical Context
The MAX708SESA+ integrates a precision voltage detector with 2.93V threshold (±1.5% tolerance), hysteresis of 20mV, and internal timing circuitry that guarantees 200ms reset pulse width after VCC exceeds threshold or MR release. It features separate RESET (active-high) and RESET (active-low) outputs driven independently by the same reset generator.
Unlike the MAX706 series, the MAX708SESA+ omits the watchdog timer and WDI/WDO pins, instead dedicating pins 7 and 8 to dual reset outputs. Its PFI input connects to an internal 1.25V reference comparator, enabling configurable power-fail or low-battery detection with <25nA input current and 10mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely monitors +3.3V supply for brownout at defined trip point |
| Reset Pulse Width | 200ms typical - ensures µP completes full initialization before release |
| Supply Voltage Range | 1.2V to 5.5V - supports operation down to VCC = 1.2V with guaranteed RESET assertion to 1V |
| Quiescent Current | 100µA max - enables long battery life in portable equipment |
| PFI Threshold | 1.25V ±4% - provides stable reference for external resistive divider-based power-fail sensing |
| Operating Temperature | −40°C to +85°C - qualified for industrial embedded environments |
| Output Drive | RESET: VOL ≤0.4V @ 1.2mA sink; RESET: VOH ≥VCC−1.5V @ 800µA source - compatible with TTL/CMOS logic inputs |
Pinout & Package
MAX708SESA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compliant, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; debounced by 200ms reset timer |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; powers all internal circuits and resets outputs when below 2.93V |
| 3 (GND) | Ground reference | Return path for all internal currents and output sinks |
| 4 (PFI) | Power-fail comparator input | Connects to external resistor divider; asserts PFO when voltage falls below 1.25V |
| 5 (PFO) | Active-low power-fail output | Open-drain output sinking up to 3.2mA; used to trigger µP interrupt or assert MR |
| 6 (RESET) | Active-low reset output | Guaranteed low during power-up/brownout; held low for 200ms after VCC > 2.93V |
| 7 (RESET) | Active-high reset output | Complementary to pin 6; high during fault, low after valid reset delay |
| 8 (NC) | No connection | Not internally bonded; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Precision 2.93V threshold | ±1.5% accuracy over −40°C to +85°C ensures consistent brownout detection across temperature and voltage drift |
| Guaranteed reset to VCC = 1V | Ensures deterministic µP hold condition even during deep undervoltage events before complete power collapse |
| Low 100µA quiescent current | Extends battery runtime in always-on portable instrumentation without compromising supervision reliability |
| Configurable power-fail warning | PFI/PFO pair enables user-defined early-warning thresholds (e.g., unregulated DC dropout) via simple resistor network |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by 3.3V Li-ion battery with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main supply rail and triggers controlled shutdown when battery drops below 2.93V or unregulated input fails. Use Value: Prevents corrupted EEPROM writes and firmware crashes during transition between power sources using dual-reset signaling. |
Use Scenario: PLC I/O module operating in factory environment with noisy 3.3V backplane supply. IC Role / Device Role / Timing Role: Monitors 3.3V rail and asserts both RESET and RESET to synchronize FPGA, MCU, and analog front-end on brownout. Use Value: Eliminates race conditions during recovery by guaranteeing simultaneous, glitch-free reset release across heterogeneous logic families. |
| Critical µP Power Monitoring | Intelligent Medical Sensors |
Use Scenario: Embedded medical data logger requiring FDA-grade power integrity assurance. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation and latching behavior during VCC sag, with PFO linked to watchdog interrupt line. Use Value: Meets IEC 62304 power-supervision requirements via deterministic 200ms pulse and 1.25V auxiliary monitoring. |
Use Scenario: Wireless ECG patch with ultra-low-power ARM Cortex-M0+ and coin-cell battery. IC Role / Device Role / Timing Role: Detects end-of-life battery voltage drop (via PFI divider) and initiates graceful sensor shutdown before brownout. Use Value: Extends usable battery capacity by 12% through predictive low-battery warning instead of reactive reset-only response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TESA+ | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, function, and specs | Suitable for +3.3V systems with tighter upper margin tolerance or higher nominal supply | Select when system VCC nominal is ≥3.25V and brownout must occur closer to rail maximum |
| MAX706SESA+ | Single active-low RESET output only; includes watchdog timer (WDO/WDI) and no RESET pin | Used where µP requires watchdog supervision and only one reset polarity is needed | Choose if watchdog functionality is mandatory and dual-reset is unnecessary |
Compared with MAX708SESA+, MAX708TESA+ shifts brownout detection upward by 150mV for higher-VCC stability, while MAX706SESA+ trades dual-reset capability for integrated watchdog monitoring - making MAX708SESA+ optimal for systems needing synchronized reset polarity flexibility without timer overhead.
Availability
MAX708SESA+ is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX708SESA+ 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 demanding industrial, automotive, and computing applications.
The MAX708 family delivers cost-effective, single-chip µP supervision for +3V systems - emphasizing dual-reset flexibility, low-power operation, and robust power-fail detection without watchdog complexity.
FAQ
What is the reset threshold voltage for MAX708SESA+?
The MAX708SESA+ has a precision reset threshold of 2.93V ±1.5%, specified over the full −40°C to +85°C operating temperature range. This value is factory-trimmed and applies to both RESET and RESET outputs. The threshold remains stable under varying load and supply conditions, ensuring consistent brownout detection for +3.3V systems.
Does MAX708SESA+ include a watchdog timer?
No, the MAX708SESA+ does not include a watchdog timer. Unlike the MAX706 series, the MAX708SESA+ omits WDI and WDO pins entirely and instead provides dedicated RESET (active-high) and RESET (active-low) outputs on pins 7 and 6 respectively. This makes MAX708SESA+ ideal for applications requiring dual-polarity reset signaling without watchdog supervision overhead.
What is the function of the PFI and PFO pins on MAX708SESA+?
On the MAX708SESA+, PFI (pin 4) is the input to an internal 1.25V comparator used for power-fail or low-battery detection; it accepts an external resistive divider. PFO (pin 5) is the open-drain active-low output that asserts when PFI falls below 1.25V. Together they enable customizable early-warning monitoring of auxiliary supplies independent of the main VCC rail.
Can MAX708SESA+ operate with a 3.0V supply?
Yes, the MAX708SESA+ operates across 1.2V to 5.5V, and is fully specified at 3.0V. At 3.0V, it maintains 2.93V reset threshold detection, 200ms reset pulse width, and guaranteed RESET assertion down to VCC = 1V. Output drive strength is reduced versus 5V operation, but remains sufficient for driving standard CMOS inputs with appropriate pull-ups.
What package type is used for MAX708SESA+?
The MAX708SESA+ is supplied in an 8-pin SO (Small Outline) package with JEDEC MS-012AC outline, package code S8-2, 1.27mm lead pitch, and lead-free finish. It is surface-mount compatible and pin-identical to other MAX708 variants in SO-8, enabling direct substitution within the same footprint.
MAX708SESA+ 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX708SESA+ FAQ
1.How can I place an order for MAX708SESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SESA+ 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 MAX708SESA+ reliable?
The price and inventory of MAX708SESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SESA+ is usually 5 days.
3.What payment methods are accepted for MAX708SESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SESA+?
MAX708SESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SESA+ 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 MAX708SESA+?
For technical support, including MAX708SESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SESA+ requirements.
6.How does Aetrix verify that MAX708SESA+ is sourced from the original manufacturer or authorized distributors?
All MAX708SESA+ 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 MAX708SESA+ meets industry standards.
7.What is the process for return or replacement of MAX708SESA+?
All MAX708SESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SESA+, 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 MAX708SESA+ part is unused and in its original packaging.
Return procedure for MAX708SESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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