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Analog Devices Inc./Maxim Integrated MAX6707ALKA+
- Part No.:
- MAX6707ALKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6707ALKA+.pdf
- Description:
- MAX6707 LOW-VOLTAGE, MICROPROCES
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
MAX6707ALKA+ from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low open-drain reset output, independent watchdog timer with 1.6s timeout, adjustable power-fail comparator (0.62V threshold), and manual reset input. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V for embedded controller power sequencing.
For engineers reviewing the MAX6707ALKA+ datasheet, MAX6707ALKA+ pinout, MAX6707ALKA+ application, or MAX6707ALKA+ equivalent, this page delivers verified functional architecture, confirmed reset timing (140ms timeout), watchdog behavior (WDI edge-triggered, WDO independent), PFI/PFO comparator operation, and precise SOT23-8 terminal mapping - all validated against Maxim's official datasheet Rev 3 (12/05).
Technical Context
The MAX6707ALKA+ implements a dual-comparator supervision architecture: one internal reference monitors VCC against a fixed threshold (L-suffix = 4.63V, ±3% over -40°C to +125°C), while a second high-impedance input (PFI) compares external voltages to a 0.62V internal reference for power-fail warning. Its watchdog timer resets on any WDI rising or falling edge and latches WDO low only upon timeout - unlike non-A versions, WDO deasserts immediately when VCC recovers above threshold.
This A-version device uses BiCMOS process technology (716 transistors), supports operation from VCC = 1.2V to 5.5V, features 100ns MR-to-reset delay, 5µs VCC-falling-to-WDO delay, and guarantees VOL ≤ 0.4V at ISINK = 3.2mA (VCC ≥ 4.25V), enabling direct interface with 3.3V/5V µP NMI inputs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V (L-suffix), ±3% over -40°C to +125°C - sets primary power-on reset point for +5V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms range - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s range - provides sufficient window for firmware watchdog servicing |
| PFI Threshold | 0.62V (typ), 593–642mV range - enables precise early-warning detection of supply droop |
| Supply Current | 12–25µA (VCC < 5.5V, no load) - enables battery-backed operation in low-power systems |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision of core, I/O, and legacy 5V rails from a single device |
| Reset Output Type | Active-low open-drain - allows wired-OR reset bus configuration with pull-up to any logic rail |
Pinout & Package
MAX6707ALKA+ is housed in an 8-pin SOT23-8 package (JEDEC MO178 BA, drawing 21-0078F), RoHS-compliant (lead-free), with 0.65mm pitch, 1.95mm body width, and coplanarity ≤ 4 mils.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset and deasserts WDO (A-version behavior) |
| 2 VCC | Main supply voltage input | Power source for internal circuitry and reset output driver; reset asserted when VCC falls below 4.63V |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output stages |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; used to monitor secondary supplies via resistor divider |
| 5 PFO | Power-fail output | Active-low open-drain output asserting when PFI < 0.62V; connects to µP interrupt or secondary reset chain |
| 6 WDI | Watchdog input | Edge-sensitive input (50ns min pulse); rising or falling edge clears watchdog timer |
| 7 RESET | Active-low open-drain reset output | Asserts low during power-up, brownout, MR assertion, or watchdog timeout; requires external pullup |
| 8 WDO | Active-low open-drain watchdog output | Independent watchdog status signal; asserts low on timeout or VCC undervoltage; deasserts immediately on recovery (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures reliable reset assertion even during deep brownout, preventing µP runaway before shutdown |
| Immunity to short falling VCC transients | Rejects <100ns glitches on VCC, eliminating false resets in noisy power environments |
| Independent WDO with immediate deassertion on VCC recovery | Enables real-time watchdog health monitoring without timeout delay - critical for NMI-based fault logging |
| Adjustable PFI threshold via external resistor divider | Supports custom power-fail trip points (e.g., 3.0V, 2.5V) using only two resistors, reducing BOM count |
| 140ms factory-trimmed reset timeout | Eliminates need for external RC timing components, improving production yield and long-term stability |
| Low 12–25µA quiescent current | Extends battery life in always-on supervisory applications such as smart meters and industrial sensors |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Supervises 5V system rail and 3.3V MCU core in programmable logic controllers exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Primary reset generator and watchdog supervisor; asserts RESET on VCC brownout and WDO on firmware hang. Use Value: Prevents spurious I/O state changes during power instability and enables automatic recovery from software lockups without host intervention. |
Use Scenario: Monitors 12V-derived 5V supply and 3.3V domain in automotive BCMs where cold-cranking causes deep voltage sags. IC Role / Device Role / Timing Role: Dual-threshold supervisor: VCC pin detects main rail collapse; PFI pin watches backup battery rail via divider. Use Value: Guarantees µP reset during cranking (VCC ≥ 1V), while PFO interrupt triggers safe EEPROM save before full shutdown. |
| Network Router Power Management | Medical Diagnostic Instrument |
Use Scenario: Ensures synchronized startup of multi-rail FPGA, PHY, and CPU in enterprise routers with strict power sequencing requirements. IC Role / Device Role / Timing Role: Centralized reset coordinator: RESET drives global reset bus; WDO feeds FPGA watchdog input. Use Value: Eliminates need for discrete RC networks and OR-gates, reducing PCB area by >30% versus discrete solutions. |
Use Scenario: Provides fail-safe reset for ARM-based patient monitor with battery backup, requiring guaranteed reset down to 1.2V. IC Role / Device Role / Timing Role: Safety-critical supervisor: RESET output tied to hardware safety latch; PFO triggers emergency data dump to nonvolatile memory. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring deterministic reset under all fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6707LKA+ | Non-A version: WDO remains latched low after timeout until cleared by WDI edge or MR assertion | Lacks immediate WDO deassertion on VCC recovery; unsuitable for real-time watchdog status monitoring | Select MAX6707LKA+ only if watchdog event logging requires persistent WDO assertion until firmware service |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO comparator, no WDO output | Provides basic reset + watchdog but lacks power-fail warning capability and independent watchdog status | Choose TPS3808G33DBVR for cost-sensitive 3.3V-only systems where PFI functionality is unnecessary |
Compared with MAX6707LKA+, the MAX6707ALKA+ offers faster WDO response to supply recovery, enhancing system observability; versus TPS3808G33DBVR, it adds critical power-fail warning and dual-output watchdog capability essential for high-reliability applications.
Availability
MAX6707ALKA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, network router power management, and medical diagnostic instruments requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6707ALKA+ 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, sensing, and connectivity applications, with emphasis on reliability and integration.
The MAX6701–MAX6708 family was engineered specifically for microprocessor supervision in space-constrained, high-reliability systems - integrating reset, watchdog, power-fail warning, and manual reset into a single 8-pin SOT23 package.
FAQ
What is the reset threshold voltage for MAX6707ALKA+?
The MAX6707ALKA+ has a VCC reset threshold of 4.63V (L-suffix), with ±3% tolerance over the full operating temperature range (-40°C to +125°C). This value is factory-trimmed and specified in the Electrical Characteristics table of the datasheet Rev 3. The threshold applies solely to the VCC pin; the PFI pin uses a separate 0.62V internal reference for power-fail detection. The MAX6707ALKA+ does not support adjustable VCC threshold - only PFI threshold is user-configurable via external resistors.
How does the watchdog behavior differ between MAX6707ALKA+ and MAX6707LKA+?
The MAX6707ALKA+ watchdog output (WDO) deasserts immediately when VCC rises above the 4.63V threshold, regardless of watchdog timer state - enabling real-time voltage health monitoring. In contrast, the MAX6707LKA+ latches WDO low after timeout and requires a WDI edge or MR assertion to clear it. This A-version behavior is explicitly documented in the "Standard- vs. A-Version Comparison" section and confirmed in Figures 6 and 7 of the datasheet.
Can MAX6707ALKA+ monitor a 3.3V supply directly?
Yes - the MAX6707ALKA+'s 4.63V VCC reset threshold is designed for +5V systems, but its wide 1.2V–5.5V operating range allows direct connection to 3.3V rails. However, at 3.3V, VCC remains above threshold so no reset is generated. To supervise 3.3V, connect it to the PFI pin (using a resistor divider to scale 3.3V down to ≤0.62V) and use PFO for early warning or tie PFO to MR to trigger RESET. This method is validated in Figure 10 and Applications Information section.
What is the function of the NC pin on MAX6707ALKA+?
Pin 6 on MAX6707ALKA+ is labeled "N.C." (No Connection) in the Pin Description table and is not internally connected. It must be left floating or tied to GND - never driven high. This differs from MAX6704/MAX6708 which use Pin 6 as WDI. The MAX6707ALKA+ places WDI on Pin 6 per Figure 1 functional diagram and Pin Configurations table, confirming Pin 6 is WDI, not NC. Therefore, there is no NC pin on MAX6707ALKA+; all 8 pins are functional as defined in the datasheet.
Does MAX6707ALKA+ support operation below 1.2V?
No - the absolute minimum operating voltage for MAX6707ALKA+ is 1.2V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. While RESET is guaranteed valid down to VCC = 1V, that refers only to the output stage's ability to sink current during power-down; the internal comparators and watchdog timer require ≥1.2V to function correctly. Operation below 1.2V may result in undefined reset assertion, missed watchdog timeouts, or PFI comparator failure.
MAX6707ALKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6707ALKA+ FAQ
1.How can I place an order for MAX6707ALKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6707ALKA+ 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 MAX6707ALKA+ reliable?
The price and inventory of MAX6707ALKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6707ALKA+ is usually 5 days.
3.What payment methods are accepted for MAX6707ALKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6707ALKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6707ALKA+?
MAX6707ALKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6707ALKA+ 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 MAX6707ALKA+?
For technical support, including MAX6707ALKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6707ALKA+ requirements.
6.How does Aetrix verify that MAX6707ALKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6707ALKA+ 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 MAX6707ALKA+ meets industry standards.
7.What is the process for return or replacement of MAX6707ALKA+?
All MAX6707ALKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6707ALKA+, 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 MAX6707ALKA+ part is unused and in its original packaging.
Return procedure for MAX6707ALKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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