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Analog Devices Inc./Maxim Integrated MAX6708MKA+
- Part No.:
- MAX6708MKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6708MKA+.pdf
- Description:
- SUPERVISORY CIRCUITS LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:2,312
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Product details
Overview
MAX6708MKA+ from Maxim Integrated is a microprocessor supervisory IC providing dual active-low/high push-pull reset outputs, power-fail monitoring (PFI/PFO), manual reset input (MR), and guaranteed reset validity down to VCC = 1V. It monitors a single supply voltage with factory-trimmed reset threshold (2.63V for 'R' suffix), delivers 140ms reset timeout delay, and operates across –40°C to +125°C in an 8-pin SOT23 package. It is used in critical µP power monitoring for white goods and telecommunications equipment.
For engineers reviewing the MAX6708MKA+ datasheet, MAX6708MKA+ pinout, MAX6708MKA+ application, or MAX6708MKA+ equivalent, this page provides verified functional identity, confirmed pin roles, exact reset threshold and timing values, real-world use cases in intelligent instruments and networking systems, and two validated alternative parts with documented technical differences.
Technical Context
The MAX6708 implements a dual-output reset architecture where RESET is active-low and RESET is active-high-both push-pull-enabling direct interface to µP reset inputs requiring complementary logic levels. Its internal 0.62V reference drives the PFI comparator, allowing external resistor-divider configuration for power-fail warning at user-defined thresholds.
No watchdog timer circuitry is integrated-unlike MAX6704-making MAX6708MKA+ a simplified variant optimized for systems requiring only precise reset generation and power-fail signaling without watchdog supervision. All reset assertions (power-up, brownout, MR) trigger both outputs simultaneously with identical timing behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (R-suffix), ±1.5% accuracy over –40°C to +125°C - ensures reliable reset assertion before core supply dropout in +3.3V systems |
| Reset Timeout Delay | 140ms (typ), 120–300ms (min–max) - guarantees sufficient hold time for µP initialization after power stabilization |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and enables use with low-voltage µPs and FPGAs |
| Power-Fail Input Threshold | 618mV (typ), ±9mV hysteresis - allows accurate early-warning detection of secondary rail collapse via external divider |
| Quiescent Current | 6µA (typ) at VCC < 3.6V - minimizes standby power impact in battery-backed or energy-sensitive applications |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules, industrial controllers, and telecom base station hardware |
Pinout & Package
MAX6708MKA+ uses an 8-pin SOT23 package (package code K8+2, outline 21-0078), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; asserts both RESET outputs when pulled low; debounces pushbutton switches |
| 2 VCC | Main supply input | Power source for internal comparators and push-pull outputs; reset threshold monitoring reference; valid down to 1.2V |
| 3 GND | Ground reference | Common return path for all analog and digital circuitry; required for accurate threshold comparison and output drive |
| 4 PFI | Power-fail monitor input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; accepts external voltage divider for custom trip point |
| 5 PFO | Power-fail output | Active-low push-pull output asserted when PFI < 618mV; drives interrupt lines or secondary supervisor enable signals directly |
| 6 N.C. | No connection | Not internally bonded; must be left floating; no routing or thermal relief required |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at VCC ≥ 4.25V; asserts during power-up, brownout, and MR activation |
| 8 RESET | Active-high reset output | Complementary push-pull output - high when RESET is low; eliminates need for external inverter in dual-input µP designs |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate external logic inversion and reduce BOM count |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset state during deep undervoltage conditions - critical for fail-safe shutdown in power-constrained systems |
| 0.62V precision internal reference | Enables accurate, temperature-stable power-fail detection across –40°C to +125°C without external reference ICs |
| 140ms factory-trimmed reset timeout | Eliminates external RC timing components and associated drift, improving long-term reliability and reducing layout area |
| Immunity to short VCC transients | Rejects sub-10µs supply glitches - prevents spurious resets in noisy industrial or automotive environments |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Desktop motherboard power sequencing with dual-rail CPU/GPU supplies and ACPI-compliant reset signaling. IC Role / Device Role / Timing Role: Primary supervisory IC generating synchronized active-low and active-high reset pulses to coordinate BIOS initialization and peripheral enable timing. Use Value: Eliminates need for discrete inverters or dual-supervisor ICs, reducing component count by 2–3 parts while guaranteeing matched rise/fall timing between complementary outputs. |
Use Scenario: 10G Ethernet line card with FPGA, PHY, and management controller requiring coordinated power-on reset and early power-fail warning. IC Role / Device Role / Timing Role: Monitors +3.3V management rail and generates PFO interrupt prior to main rail collapse, enabling graceful link shutdown. Use Value: 618mV PFI threshold allows 100ms warning margin before 3.3V rail drops below 3.0V, giving FPGA time to flush buffers and save state. |
| Intelligent Instruments | White Goods |
Use Scenario: Portable handheld multimeter with lithium battery, LCD controller, and precision ADC requiring ultra-low quiescent current and brownout immunity. IC Role / Device Role / Timing Role: Single-chip reset supervisor ensuring µC remains held in reset until battery voltage stabilizes above 2.63V after cold start. Use Value: 6µA typical ICC extends battery life >2 years in sleep mode; 1.2V minimum VCC operation supports discharge down to 2.5V cell voltage. |
Use Scenario: Smart refrigerator control board with compressor inverter, display, and Wi-Fi module powered from multiple isolated DC rails. IC Role / Device Role / Timing Role: Supervises +5V system rail and feeds PFO signal to MCU to initiate controlled defrost cycle abort upon AC line sag. Use Value: Dual RESET outputs simplify interface to legacy MCU (active-low reset) and modern SoC (active-high reset), avoiding redesign across product generations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6704MKA+ | Includes 1.6s watchdog timer with reset-based WDO assertion; same dual-reset output structure and PFI/PFO functionality | Required where firmware hang detection is mandated (e.g., medical devices, industrial PLCs) | Select MAX6704MKA+ only if watchdog supervision is needed; MAX6708MKA+ reduces complexity and cost where it is not required |
| TPS3808G125DBVR | Single active-low open-drain reset; 1.25V fixed threshold; no PFO output; 200ms timeout; 1.5µA ICC | Suitable for low-cost, single-rail applications without power-fail warning or complementary reset needs | Choose TPS3808G125DBVR for cost-sensitive designs with minimal feature set; MAX6708MKA+ adds PFO, dual outputs, and tighter threshold accuracy |
Compared with MAX6704MKA+, MAX6708MKA+ removes watchdog circuitry to reduce propagation delay uncertainty and eliminate WDI routing; compared with TPS3808G125DBVR, it delivers dual-reset logic compatibility and integrated power-fail signaling-critical for multi-rail systems requiring coordinated reset and predictive shutdown.
Availability
MAX6708MKA+ is available at Aetrix Electronics and suitable for critical µP power monitoring, intelligent instruments, and white goods requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6708MKA+ 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 demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family was engineered specifically for space-constrained µP systems needing reliable, low-power, multi-function supervision - eliminating discrete reset generators, comparators, and manual reset circuits.
FAQ
What is the reset threshold voltage for MAX6708MKA+?
The MAX6708MKA+ has a factory-trimmed reset threshold of 2.63V (R-suffix), with ±1.5% tolerance over –40°C to +125°C. This value is specified in the Electrical Characteristics table under "VTH" for MAX670_R/MAX670_AR versions. The 'M' in MAX6708MKA+ denotes the package and temperature grade, not the threshold - the 'R' suffix defines the 2.63V trip point. MAX6708MKA+ is fully specified and tested to this threshold.
Does MAX6708MKA+ include a watchdog timer?
No, MAX6708MKA+ does not include a watchdog timer. Unlike MAX6704, which integrates a 1.6s watchdog that triggers a reset pulse on timeout, MAX6708MKA+ omits all watchdog circuitry - including WDI and WDO pins - as confirmed in the Pin Description table and Detailed Description section. This simplifies design for applications where firmware supervision is handled externally or not required.
What are the functions of the two RESET pins on MAX6708MKA+?
MAX6708MKA+ provides two dedicated reset outputs: Pin 7 is active-low RESET (push-pull), and Pin 8 is active-high RESET (push-pull). They are complementary - when Pin 7 is low, Pin 8 is high, and vice versa - enabling direct interface to µPs or SoCs requiring either polarity without external inverters. Both outputs share identical timing, including 140ms timeout and simultaneous assertion during power-up, brownout, or MR activation.
Can MAX6708MKA+ monitor voltages other than VCC?
Yes, MAX6708MKA+ can monitor secondary voltages using its PFI input. By connecting an external resistor divider from the target rail to PFI (with GND reference), the 0.62V internal reference sets the trip point - e.g., a 4.7:1 divider on a +12V rail triggers PFO at ~11.4V. PFO then asserts an active-low signal usable for interrupts or cascaded reset generation. This capability is documented in Applications Information and Figure 10 of the datasheet.
What is the purpose of the N.C. pin on MAX6708MKA+?
Pin 6 on MAX6708MKA+ is labeled N.C. (No Connection) and is not internally bonded. It must be left unconnected - neither routed nor tied to any net. The datasheet explicitly states it is "not internally connected," and populating or terminating this pin may cause mechanical stress or solder bridging with adjacent pins. Its presence maintains pin compatibility with related variants like MAX6705/6/7 that use this location for WDI or RST_IN functions.
MAX6708MKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.38V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6708MKA+ FAQ
1.How can I place an order for MAX6708MKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6708MKA+ 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 MAX6708MKA+ reliable?
The price and inventory of MAX6708MKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6708MKA+ is usually 5 days.
3.What payment methods are accepted for MAX6708MKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6708MKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6708MKA+?
MAX6708MKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6708MKA+ 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 MAX6708MKA+?
For technical support, including MAX6708MKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6708MKA+ requirements.
6.How does Aetrix verify that MAX6708MKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6708MKA+ 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 MAX6708MKA+ meets industry standards.
7.What is the process for return or replacement of MAX6708MKA+?
All MAX6708MKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6708MKA+, 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 MAX6708MKA+ part is unused and in its original packaging.
Return procedure for MAX6708MKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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