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Analog Devices Inc./Maxim Integrated MAX706ASESA+T
- Part No.:
- MAX706ASESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706ASESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,488
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Product details
Overview
MAX706ASESA+T from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing reset generation during power-up/down/brownout (2.93V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input. It operates over –40°C to +85°C in 8-pin SO package and is used in portable instruments and battery-powered controllers.
For engineers reviewing the MAX706ASESA+T datasheet, MAX706ASESA+T pinout, MAX706ASESA+T application, or MAX706ASESA+T equivalent, this page delivers verified functional identity, confirmed reset threshold and watchdog timing, validated SO-8 pin mapping, and two field-validated alternative parts with documented technical differences.
Technical Context
The MAX706ASESA+T implements a precision voltage monitor with 2.93V ±1.5% reset threshold and guaranteed RESET assertion down to VCC = 1V. Its internal 200ms reset timer ensures reliable µP initialization after supply stabilization.
It integrates a 1.6s watchdog timer that resets on WDI edge transitions and disables automatically when WDI is left open or connected to a high-impedance tri-state output (<600nA leakage). The 1.25V PFI comparator supports external resistive-divider monitoring of auxiliary supplies or battery voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely matches +3.3V system supply tolerance for reliable brownout detection |
| Reset Pulse Width | 200ms typical - ensures µP completes full boot sequence before release from reset |
| Watchdog Timeout | 1.6s ±40% - provides sufficient margin for firmware execution loops without false triggers |
| Quiescent Current | 100µA max at VCC = 3.3V - enables multi-year operation in battery-backed applications |
| PFI Threshold | 1.25V ±40mV - allows accurate low-battery warning or unregulated supply monitoring via external divider |
| Supply Range | 3.0V to 5.5V - supports dual-mode operation from Li-ion battery or 5V wall adapter |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive-adjacent embedded environments |
Pinout & Package
MAX706ASESA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, 150 mil width, with gull-wing leads and RoHS-compliant lead-free finish (PKG CODE S8-2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA current; 500ns minimum pulse width at 3V |
| 2 VCC | Positive supply input | Accepts 3.0V–5.5V; requires 0.1µF bypass capacitor to GND for noise immunity |
| 3 GND | Ground reference | Common return for all internal circuits and external reset load |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO when input falls below 1.25V |
| 5 PFO | Active-low power-fail output | Open-drain output; sinks current when PFI < 1.25V; used for early-warning interrupt |
| 6 WDO | Active-low watchdog output | Asserts if WDI not toggled within 1.6s; also asserts on VCC brownout; connects to µP NMI or MR |
| 7 RESET | Active-low reset output | Guaranteed logic-low down to VCC = 1V; 200ms deassertion delay after VCC rise above threshold |
| 8 WDI | Watchdog input | Edge-sensitive; accepts pulses as narrow as 100ns at 3V; disables watchdog when left floating or high-Z |
Key Features
| Feature | Design Value |
|---|---|
| 2.93V Precision Reset Threshold | Matches +3.3V µP core supply with ±1.5% tolerance - eliminates need for external resistor network calibration |
| WDI Auto-Disable Function | Watchdog timer disables safely when WDI is unconnected or driven by high-impedance tri-state I/O - prevents spurious timeouts during debug or sleep modes |
| 1.25V Internal Reference for PFI | Enables accurate monitoring of secondary supplies (e.g., 12V rail via divider) or battery voltage without external reference IC |
| 200ms Guaranteed Reset Hold Time | Ensures µP clock and PLL stabilize before release - meets ARM Cortex-M and PIC MCU reset timing requirements |
| 100µA Quiescent Current | Supports >5-year runtime in coin-cell–powered IoT sensors with periodic wake-up cycles |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered ECG device operating from single 3.3V LiPo cell with backup supercapacitor. IC Role / Device Role / Timing Role: Supervises main supply voltage, triggers orderly shutdown on battery depletion, and resets µP if firmware hangs. Use Value: 2.93V reset threshold aligns with LiPo discharge curve; 1.25V PFI monitors supercapacitor voltage to initiate graceful save before power loss. |
Use Scenario: DIN-rail mounted controller with isolated 24V DC input, regulated 3.3V µP domain, and 5V I/O bus. IC Role / Device Role / Timing Role: Monitors 3.3V core rail and watches µP activity; asserts RESET on brownout and WDO on software lockup. Use Value: 200ms reset pulse satisfies ARM-based µP boot timing; WDO-to-MR connection enables self-recovery without operator intervention. |
| Smart Energy Meter | Automotive Telematics Module |
Use Scenario: ANSI C12.20-certified meter with dual-supply design: 3.3V µP domain and 5V RF transceiver. IC Role / Device Role / Timing Role: Provides independent reset for µP and generates power-fail interrupt to log last valid kWh reading. Use Value: PFO output drives µP interrupt pin to trigger EEPROM write before VCC drops below 2.93V - ensures data integrity across 10,000+ cycles. |
Use Scenario: CAN-connected telematics unit powered from vehicle 12V battery with wide-input DC-DC converter. IC Role / Device Role / Timing Role: Supervises 3.3V output of DC-DC converter and detects firmware stalls during GPS/GSM handshaking. Use Value: Watchdog timeout (1.6s) accommodates longest GSM registration sequence; –40°C to +85°C rating ensures reliability in under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TESA+ | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, timing, and feature set | Suitable for +3.3V systems with tighter upper supply tolerance or higher dropout margin | Select MAX706TESA+ when system VCC nominal is 3.3V ±3% and brownout must occur only below 3.0V |
| TPS3808G33DBVR | 3.3V fixed threshold; 200ms reset delay; no watchdog or PFI; 35µA quiescent current | Lacks watchdog and power-fail comparator - suitable only for basic reset-only applications | Choose TPS3808G33DBVR for cost-sensitive designs where watchdog and PFI functions are implemented elsewhere |
Compared with MAX706TESA+, MAX706ASESA+T offers earlier brownout response for marginal 3.3V rails; compared with TPS3808G33DBVR, it adds critical watchdog and power-fail monitoring at modest quiescent current penalty - making it optimal for autonomous recovery in remote deployments.
Availability
MAX706ASESA+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and automotive telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706ASESA+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 MAX706 family was designed specifically for low-cost, high-reliability microprocessor supervision in battery-powered and industrial embedded systems - emphasizing precision voltage thresholds, low quiescent current, and integrated watchdog/PFI functionality.
FAQ
What is the exact reset threshold voltage for MAX706ASESA+T?
The MAX706ASESA+T has a factory-trimmed reset threshold of 2.93V with ±1.5% tolerance over temperature and supply voltage. This value is specified for VCC falling conditions and ensures reliable assertion of the active-low RESET signal when the +3.3V supply drops below system operational limits. The threshold is laser-trimmed during production and does not require external calibration.
Does MAX706ASESA+T include a watchdog timer, and how is it configured?
Yes, MAX706ASESA+T includes a 1.6s watchdog timer monitored via the WDI pin. A rising or falling edge on WDI resets the timer; failure to toggle within 1.6s asserts the active-low WDO output. Unlike the base MAX706R/S/T series, the MAX706ASESA+T (as part of the 'A' variant) auto-disables the watchdog when WDI is left open or connected to a high-impedance tri-state output with leakage <600nA - simplifying debug and low-power mode handling.
Can MAX706ASESA+T monitor a secondary power supply like a 12V rail?
Yes, MAX706ASESA+T can monitor auxiliary supplies using its PFI (Power-Fail Input) pin and internal 1.25V reference. By connecting PFI to a resistive divider from the 12V rail, the device asserts the active-low PFO output when the divided voltage falls below 1.25V - corresponding to ~11V on the 12V rail (e.g., 1MΩ/130kΩ divider). This enables early-warning power-fail interrupts without adding external comparators.
What package type and footprint does MAX706ASESA+T use?
MAX706ASESA+T uses an 8-pin SO (Small Outline) package per JEDEC MS-012, 150 mil body width, with gull-wing leads and RoHS-compliant lead-free finish (PKG CODE S8-2). It is pin-compatible with industry-standard SO-8 footprints and supports reflow soldering per IPC/JEDEC J-STD-020. The package is not µMAX or DIP - only SO-8 is offered for the 'E' temperature grade with 'SA' suffix.
How does MAX706ASESA+T behave during power-down when VCC falls below 1V?
MAX706ASESA+T guarantees RESET remains asserted (logic-low) down to VCC = 1V. Below 1V, the RESET output enters high-impedance state and no longer actively sinks current. To prevent floating reset lines in systems where VCC may decay slowly, a pull-down resistor (e.g., 100kΩ) should be added externally between RESET and GND - ensuring the µP stays held in reset until fully powered down.
MAX706ASESA+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX706ASESA+T FAQ
1.How can I place an order for MAX706ASESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706ASESA+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 MAX706ASESA+T reliable?
The price and inventory of MAX706ASESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706ASESA+T is usually 5 days.
3.What payment methods are accepted for MAX706ASESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706ASESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706ASESA+T?
MAX706ASESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706ASESA+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 MAX706ASESA+T?
For technical support, including MAX706ASESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706ASESA+T requirements.
6.How does Aetrix verify that MAX706ASESA+T is sourced from the original manufacturer or authorized distributors?
All MAX706ASESA+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 MAX706ASESA+T meets industry standards.
7.What is the process for return or replacement of MAX706ASESA+T?
All MAX706ASESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706ASESA+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 MAX706ASESA+T part is unused and in its original packaging.
Return procedure for MAX706ASESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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