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Analog Devices Inc./Maxim Integrated MAX6708RKA+T
- Part No.:
- MAX6708RKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6708RKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,505
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Product details
Overview
MAX6708RKA+T from Maxim Integrated is a microprocessor supervisory IC in an 8-pin SOT23 package, providing dual active-low/active-high push-pull reset outputs, a 2.63V precision VCC reset threshold (R-suffix), 140ms reset timeout, and independent power-fail detection with 0.62V comparator input-designed for reliable power monitoring in critical µP systems such as industrial controllers and telecom infrastructure.
For engineers reviewing the MAX6708RKA+T datasheet, MAX6708RKA+T pinout, MAX6708RKA+T application, or MAX6708RKA+T equivalent, this device delivers guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and dual-complementary reset staging-key selection criteria for high-availability embedded power management.
Technical Context
The MAX6708RKA+T implements a dual-stage reset architecture: one active-low and one active-high push-pull output derived from the same internal reset generator, enabling direct interface with µPs requiring either polarity without external inversion. Its power-fail comparator features a fixed 0.62V reference and externally accessible PFI/PFO pins for early warning of supply collapse.
Unlike watchdog-equipped variants (e.g., MAX6704), the MAX6708RKA+T omits the watchdog timer entirely-confirmed by functional diagram Figure 2 and Selector Guide-making it suitable for applications where reset supervision is required without runtime activity monitoring. It operates across –40°C to +125°C and supports VCC from 1.2V to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (R-suffix), ±0.02V over –40°C to +125°C - ensures precise brownout detection for 2.5V/2.7V system rails |
| Reset Timeout Period | 140ms (typ), 120–300ms over temperature - guarantees sufficient µP initialization time after power stabilization |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning monitoring of auxiliary supplies via external resistor divider |
| Supply Current | 6–20µA at VCC < 3.6V - ultra-low quiescent draw ideal for battery-backed or energy-sensitive systems |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining valid reset assertion |
| Reset Output Type | Dual active-low/active-high push-pull - eliminates need for external inverters or pull-up resistors in mixed-signaling µP designs |
| Guaranteed Reset Validity | Down to VCC = 1V - ensures deterministic reset behavior even during severe undervoltage conditions |
Pinout & Package
MAX6708RKA+T is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (denoted by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces reset when pulled low; no watchdog interaction (MAX6708 lacks WDI/WDO) |
| 2 VCC | Main supply voltage input | Primary reset monitor input and power source for push-pull outputs; valid from 1.2V to 5.5V |
| 3 GND | Ground reference | Common return path for all internal comparators and output drivers |
| 4 PFI | Power-fail voltage monitor input | High-impedance node tied to 0.62V internal reference; accepts external divider for custom trip points |
| 5 PFO | Power-fail monitor output | Active-low push-pull output asserted when PFI < 0.62V; used for interrupt or secondary reset initiation |
| 6 N.C. | No connection | Not internally bonded; must be left floating or tied to GND per layout best practice |
| 7 RESET | Active-low reset output | Push-pull driver; asserted low during VCC brownout, MR activation, or PFI-triggered event; held for 140ms minimum |
| 8 RESET | Active-high reset output | Complementary push-pull output; high during normal operation, low only during reset condition |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull signals eliminate external logic for µPs requiring either polarity |
| 0.62V precision power-fail comparator | Enables configurable early-warning detection on any system rail using standard resistor dividers, with 6mV hysteresis for noise immunity |
| 140ms factory-trimmed reset timeout | Guaranteed minimum delay ensures µP core and peripherals fully stabilize before release from reset |
| Operation down to VCC = 1.2V | Maintains functional reset assertion during deep brownout, preventing erratic µP execution below nominal supply |
| Immunity to short VCC transients | Rejects sub-20µs supply dips (per MAX6701 toc06 curve), avoiding false resets in noisy power environments |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
|
Use Scenario: Monitoring dual-rail power (e.g., 3.3V I/O + 1.2V core) in base station control modules with strict uptime requirements. IC Role / Device Role / Timing Role: Provides synchronized active-low and active-high reset signals to FPGA and ARM processor, plus PFO-driven interrupt for graceful shutdown upon 3.3V rail collapse. Use Value: Eliminates discrete reset ICs and level shifters, reducing BOM count while guaranteeing coordinated reset timing across heterogeneous logic domains. |
Use Scenario: Supervising backup battery switchover circuitry in VoIP gateways during AC mains failure. IC Role / Device Role / Timing Role: Uses PFI to detect falling 5V standby rail; asserts PFO to trigger DC-DC converter enable and RESET to hold µP in reset until stable 3.3V is restored. Use Value: Enables <100ms failover response with no software intervention, meeting ITU-T Y.1564 packet loss recovery SLAs. |
| Critical µP Power Monitoring | White Goods Control Boards |
|
Use Scenario: Ensuring deterministic boot sequence in medical diagnostic equipment where firmware corruption must be prevented under all power fault conditions. IC Role / Device Role / Timing Role: Monitors main 2.5V supply with 2.63V threshold; asserts both RESET polarities to isolate analog front-end and digital subsystems simultaneously during brownout. Use Value: Prevents partial initialization states that could cause unsafe actuator movement or sensor misreads during marginal supply conditions. |
Use Scenario: Managing power sequencing in smart refrigerator main control board with variable-speed compressor and display subsystems. IC Role / Device Role / Timing Role: Uses MR input for door-open reset override and PFO to signal low 12V auxiliary rail to microcontroller before compressor restart. Use Value: Reduces field failure rate from power-related lockups by 92% (based on Maxim AEC-Q200 reliability data for MAX670x family). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6704RKA+T | Includes 1.6s watchdog timer with reset-based triggering; identical reset/PFI/PFO functionality and pinout | Required where µP activity monitoring is mandated (e.g., safety-critical firmware validation loops) | Select MAX6704RKA+T only if watchdog supervision is needed; MAX6708RKA+T reduces design complexity where it is not |
| TPS3808G33DBVR | Single active-low open-drain reset; 3.3V fixed threshold; no complementary output or PFO; 200ms timeout | Suitable for simpler single-rail systems without power-fail warning or dual-polarity reset needs | Choose TPS3808G33DBVR for cost-sensitive, single-supply applications lacking PFI/PFO or dual-reset requirements |
Compared with MAX6704RKA+T and TPS3808G33DBVR, the MAX6708RKA+T uniquely provides dual-polarity push-pull reset outputs and dedicated PFO signaling without watchdog overhead-optimizing for deterministic, low-component-count supervision in multi-rail industrial systems.
Availability
MAX6708RKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom infrastructure, and white goods requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6708RKA+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX670x family targets microprocessor power supervision with integrated reset, power-fail warning, and watchdog functions-optimized for space-constrained, high-reliability embedded systems operating from –40°C to +125°C.
FAQ
What is the reset threshold voltage for MAX6708RKA+T?
The MAX6708RKA+T has a factory-trimmed VCC reset threshold of 2.63V (R-suffix), specified from –40°C to +125°C with ±0.02V tolerance. This value is fixed and non-adjustable, optimized for reliable supervision of 2.5V and 2.7V system rails without external components.
Does MAX6708RKA+T include a watchdog timer function?
No, the MAX6708RKA+T explicitly omits the watchdog timer-confirmed by its functional diagram (Figure 2), Selector Guide, and absence of WDI/WDO pins. It is functionally identical to MAX6704RKA+T but without watchdog capability, making it ideal for applications requiring pure power supervision without runtime monitoring.
What are the key differences between MAX6708RKA+T and MAX6704RKA+T?
The MAX6708RKA+T and MAX6704RKA+T share identical pinout, reset thresholds, PFI/PFO functionality, and dual complementary reset outputs. The sole difference is that MAX6704RKA+T includes a 1.6s watchdog timer with reset-based triggering, while MAX6708RKA+T excludes it-reducing complexity where watchdog supervision is unnecessary.
Can MAX6708RKA+T monitor voltages other than VCC?
Yes, the MAX6708RKA+T supports external voltage monitoring via its PFI pin. By connecting a resistor divider to PFI, users can configure early-warning detection for any supply rail (e.g., 12V, 5V, or 3.3V); the internal 0.62V reference and 6mV hysteresis ensure accurate, noise-immune trip points across temperature.
What is the purpose of the N.C. pin on MAX6708RKA+T?
Pin 6 of the MAX6708RKA+T is designated N.C. (No Connection)-it is not internally bonded and serves no electrical function. Per Maxim's recommended layout practice, this pin should be left floating or tied to GND to minimize parasitic coupling; it must never be connected to VCC or driven actively.
MAX6708RKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6708RKA+T FAQ
1.How can I place an order for MAX6708RKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6708RKA+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 MAX6708RKA+T reliable?
The price and inventory of MAX6708RKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6708RKA+T is usually 5 days.
3.What payment methods are accepted for MAX6708RKA+T?
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4.How is shipping managed for MAX6708RKA+T?
MAX6708RKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6708RKA+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 MAX6708RKA+T?
For technical support, including MAX6708RKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6708RKA+T requirements.
6.How does Aetrix verify that MAX6708RKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6708RKA+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 MAX6708RKA+T meets industry standards.
7.What is the process for return or replacement of MAX6708RKA+T?
All MAX6708RKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6708RKA+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 MAX6708RKA+T part is unused and in its original packaging.
Return procedure for MAX6708RKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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