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Analog Devices Inc./Maxim Integrated MAX706RESA+T
- Part No.:
- MAX706RESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706RESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,397
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Product details
Overview
MAX706RESA+T from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing power-on reset, watchdog timeout (1.6s), 1.25V power-fail detection, and debounced manual reset. It asserts RESET below 2.93V VCC, guarantees reset assertion down to VCC = 1V, and draws only 100µA quiescent current - ideal for battery-powered portable instruments and critical µP power monitoring.
For engineers reviewing the MAX706RESA+T datasheet, MAX706RESA+T pinout, MAX706RESA+T application, or MAX706RESA+T equivalent, this page delivers verified functional identity, exact SO-8 pin mapping, confirmed 2.93V reset threshold and 200ms reset pulse width, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX706RESA+T implements a precision voltage monitor with 20mV hysteresis, a 1.6s watchdog timer reset by WDI transitions, and a separate 1.25V comparator for PFI-based power-fail or low-battery warning. Its RESET output remains asserted for ≥200ms after VCC rises above 2.93V or MR is released.
It features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V, internal 70µA MR pullup, and guaranteed RESET assertion even as VCC drops to 1V - enabling reliable brownout recovery in embedded controllers and portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset activation before 3.3V µP supply dropout |
| Reset Pulse Width | 200ms minimum; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; detects µP lockup without requiring external timing components |
| Quiescent Current | 100µA max at VCC = 3.3V; enables multi-year operation on coin-cell batteries |
| Power-Fail Threshold | 1.25V ±0.05V; supports accurate low-battery warning or unregulated supply monitoring via PFI divider |
| Operating Voltage Range | 3.0V to 5.5V; compatible with both +3.3V and +5V µP systems |
| Temperature Range | -40°C to +85°C; qualified for industrial and automotive-adjacent environments |
Pinout & Package
MAX706RESA+T 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; triggers 200ms RESET pulse when pulled ≤0.6V |
| 2 VCC | Positive supply input | Accepts 3.0V–5.5V; powers all internal circuits including reset generator and watchdog |
| 3 GND | Ground reference | Common return path for VCC, PFI, PFO, MR, RESET, and WDO |
| 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 interrupts |
| 6 WDI | Watchdog input | Edge-sensitive; must toggle within 1.6s to prevent WDO assertion; disables if left floating (high-Z) |
| 7 RESET | Active-low reset output | Push-pull; drives low during power-up/brownout/manual reset; holds low ≥200ms after recovery |
| 8 WDO | Active-low watchdog output | Push-pull; goes low on watchdog timeout or VCC undervoltage; resets only on WDI transition or VCC recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing µP runaway |
| WDI disable on high-impedance state | Allows safe watchdog deactivation when µP I/O enters tri-state mode (<600nA leakage) |
| Debounced MR input | Eliminates need for external RC debounce circuitry; accepts pushbutton switch directly |
| 1.25V precision PFI reference | Enables accurate power-fail detection across temperature with minimal external components |
| 20mV reset threshold hysteresis | Prevents oscillatory reset assertion near trip point during slow VCC ramp-up/down |
Applications
| Battery-Powered Portable Instruments | Critical µP Power Monitoring |
|---|---|
|
Use Scenario: Handheld multimeter powered by dual AA cells with optional USB charging. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during battery voltage sag below 2.93V and generating PFO interrupt for graceful shutdown prior to cutoff. Use Value: Prevents corrupted EEPROM writes and display glitches by guaranteeing µP reset before supply collapse; extends usable battery life via 100µA quiescent draw. |
Use Scenario: Industrial PLC controller operating in variable ambient temperatures with redundant 3.3V supplies. IC Role / Device Role / Timing Role: Primary reset supervisor monitoring main VCC, while PFI monitors backup supply rail for failover readiness. Use Value: Ensures deterministic boot sequence after power interruption; 200ms reset pulse accommodates slow-starting DC-DC converters. |
| Computers & Embedded Controllers | Intelligent Sensors & IoT Edge Nodes |
|
Use Scenario: Fanless embedded PC using 3.3V SoC with thermal throttling and sleep/wake cycles. IC Role / Device Role / Timing Role: Generates clean power-on reset and monitors µP activity via WDI to detect firmware hangs during deep-sleep wake-up. Use Value: Eliminates need for external watchdog timer IC; 1.6s timeout balances responsiveness and false-trigger immunity in burst-mode operation. |
Use Scenario: Wireless environmental sensor node with Li-SOCl₂ primary battery and BLE radio. IC Role / Device Role / Timing Role: Provides low-power reset supervision and uses PFI to trigger PFO interrupt when battery voltage drops to 2.8V (via resistor divider). Use Value: Enables predictive battery replacement alerts; 100µA supply current minimizes self-discharge impact over 10-year deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SESA+ | Identical pinout, package, and 2.93V reset threshold; same -40°C to +85°C temp grade; differs only in tape-and-reel packaging (no +T suffix) | No functional difference; suitable for identical use cases including portable instruments and µP reset supervision | Select MAX706SESA+ for reel-based SMT assembly where bulk tape format is preferred over cut-tape. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (±0.5%); 200ms reset delay; no watchdog or PFI/PFO functions; 2.5µA quiescent current | Lacks watchdog timer and power-fail comparator; suited only for basic reset-only applications without activity monitoring or auxiliary voltage sensing | Choose TPS3808G33DBVR only when watchdog and PFI functionality are unnecessary and ultra-low quiescent current is prioritized over feature set. |
Compared with MAX706RESA+T, MAX706SESA+ offers identical supervision functionality in identical packaging but without cut-tape convenience, while TPS3808G33DBVR trades away watchdog and PFI capability for lower power and tighter reset threshold accuracy - making it a functional subset rather than drop-in replacement.
Availability
MAX706RESA+T is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and critical µP power monitoring requiring stable component supply across industrial temperature ranges.
Supply support for MAX706RESA+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) designs precision analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX706 family targets cost-sensitive, space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring - specifically optimized for +3V/+3.3V operation with low quiescent current and guaranteed low-VCC reset assertion.
FAQ
What is the exact reset threshold voltage for MAX706RESA+T?
The MAX706RESA+T has a guaranteed reset threshold of 2.93V (VCC falling), with ±70mV tolerance (2.85V to 3.00V) over temperature and supply. This value is factory-trimmed and specified in the Electrical Characteristics table under "Reset Threshold (VCC Falling)" for MAX70_S and MAX706AS variants. The 'S' suffix in MAX706RESA+T explicitly denotes the 2.93V threshold grade.
Does MAX706RESA+T include a watchdog timer, and what is its timeout period?
Yes, MAX706RESA+T includes a watchdog timer with a nominal timeout period of 1.6 seconds. The actual timeout ranges from 1.00s to 2.25s depending on VCC and temperature, as specified in the Electrical Characteristics table. The timer resets on any WDI edge transition and asserts WDO low if no transition occurs within the timeout window - a core function confirmed in the General Description and Pin Description sections.
What package type and footprint does MAX706RESA+T use?
MAX706RESA+T uses an 8-pin SO (Small Outline) package with JEDEC MS-012AC outline, 1.27mm lead pitch, and S8-2 package code. It is surface-mount, lead-free, and compatible with standard reflow profiles. The pin configuration matches the SO/DIP layout shown in the Pin Configurations section, with pins 1–8 assigned to MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO respectively.
Can MAX706RESA+T monitor a secondary voltage rail like a battery or unregulated supply?
Yes, MAX706RESA+T can monitor secondary rails using its PFI (Power-Fail Input) pin, which compares an external voltage (via resistive divider) against an internal 1.25V reference. When the divided voltage falls below 1.25V, PFO asserts low - enabling early-warning detection for low-battery conditions or unregulated supply dropout, as detailed in the Power-Fail Comparator section and Figure 5.
Is the RESET output of MAX706RESA+T active-high or active-low?
The RESET output of MAX706RESA+T is active-low. As confirmed in the General Description ("MAX706R/AR, MAX706S/AS, and MAX706T/AT … have active-low reset output signals") and Pin Description ("RESET: Active-Low Reset Output"), it drives low during power-up, brownout, or manual reset, and remains low for ≥200ms after recovery. The 'R' in MAX706RESA+T designates the active-low RESET variant.
MAX706RESA+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:
- 2.63V
- 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
MAX706RESA+T FAQ
1.How can I place an order for MAX706RESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706RESA+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 MAX706RESA+T reliable?
The price and inventory of MAX706RESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706RESA+T is usually 5 days.
3.What payment methods are accepted for MAX706RESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706RESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706RESA+T?
MAX706RESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706RESA+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 MAX706RESA+T?
For technical support, including MAX706RESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706RESA+T requirements.
6.How does Aetrix verify that MAX706RESA+T is sourced from the original manufacturer or authorized distributors?
All MAX706RESA+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 MAX706RESA+T meets industry standards.
7.What is the process for return or replacement of MAX706RESA+T?
All MAX706RESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706RESA+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 MAX706RESA+T part is unused and in its original packaging.
Return procedure for MAX706RESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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