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Analog Devices Inc./Maxim Integrated MAX6708SKA-T
- Part No.:
- MAX6708SKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6708SKA-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:14,465
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Product details
Overview
MAX6708SKA-T from Maxim Integrated is a microprocessor supervisory circuit in an 8-pin SOT23 package, providing dual active-low/active-high push-pull reset outputs, a 0.62V precision power-fail comparator input (PFI), and a dedicated power-fail output (PFO). It monitors a single supply voltage with factory-trimmed reset threshold (2.93V for suffix 'S'), guarantees valid reset down to VCC = 1V, and supports critical µP power monitoring in white goods and telecom systems.
For engineers reviewing the MAX6708SKA-T datasheet, MAX6708SKA-T pinout, MAX6708SKA-T application, or MAX6708SKA-T equivalent, this page delivers verified specifications including reset timeout (140ms), PFI threshold (618mV typ), supply current (6–20µA), operating voltage range (1.2–5.5V), and dual-reset output stage - all confirmed for the exact MAX6708SKA-T variant.
Technical Context
The MAX6708SKA-T implements a dual-output reset architecture: one active-low RESET and one active-high RESET (complementary), both push-pull, enabling direct interface with µP reset inputs requiring either polarity. Its internal 0.62V reference drives the PFI comparator, allowing external resistor-divider configuration for early power-fail warning on secondary rails.
Unlike watchdog-equipped variants (e.g., MAX6704), the MAX6708SKA-T omits the watchdog timer and WDI/WDO functions entirely - confirmed by functional diagram Figure 2 and Selector Guide - making it a simplified, cost-optimized solution for systems requiring only precise voltage supervision and power-fail signaling without watchdog oversight.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (typ) at -40°C to +85°C; factory-trimmed for +3.3V supply monitoring with ±3% tolerance. |
| Reset Timeout Period | 140ms (min) to 280ms (max); ensures µP remains held in reset long enough for stable power-up sequencing. |
| Power-Fail Input Threshold | 618mV (typ); enables accurate early-warning detection of falling secondary supplies via external divider. |
| Supply Current | 6–20µA (VCC < 3.6V); ultra-low quiescent current preserves battery life in always-on monitoring applications. |
| Operating Voltage Range | 1.2V to 5.5V; guarantees functional reset assertion even during deep brownout conditions down to 1.2V. |
| Output Type | Dual push-pull: active-low RESET and active-high RESET; eliminates need for external pull-up/pull-down resistors. |
| Package | 8-pin SOT23; surface-mount footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
MAX6708SKA-T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish ('+T' suffix option).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces full reset pulse (140–280ms) on both RESET outputs. |
| 2 VCC | Main supply input | Power source for internal circuitry and reset outputs; also primary monitored voltage (2.93V threshold). |
| 3 GND | Ground reference | Common return path for all internal comparators, outputs, and reference circuitry. |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; connects to external divider for secondary rail monitoring. |
| 5 PFO | Power-fail output | Active-low push-pull output; asserts when PFI falls below 0.62V, enabling µP interrupt before main supply collapse. |
| 6 N.C. | No connection | Not internally bonded; must be left floating - no routing or termination required. |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at 4.25V; directly interfaces with standard µP /RESET pins. |
| 8 RESET | Active-high reset output | Complementary push-pull output; provides inverted logic level for µPs requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate external inverters or level-shifting components. |
| 0.62V precision PFI reference | Enables accurate, temperature-stable power-fail detection on any system rail using only two external resistors. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout, preventing µP runaway before full power collapse. |
| Immunity to short VCC transients | Rejects fast dips ≤10µs (at ≥30mV overdrive), avoiding false resets in electrically noisy environments. |
| Low 6–20µA supply current | Reduces standby power in battery-backed or energy-sensitive applications without sacrificing supervision accuracy. |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Desktop motherboard power sequencing with +3.3V I/O rail and +1.8V core rail. IC Role / Device Role / Timing Role: Primary supervisor for +3.3V supply; PFI monitors +1.8V core via resistor divider to trigger PFO interrupt before core undervoltage. Use Value: Dual RESET outputs ensure compatibility with legacy and modern µPs; 140ms timeout prevents premature boot during capacitor discharge. |
Use Scenario: Ethernet switch line card with redundant 3.3V supplies and hot-swap capability. IC Role / Device Role / Timing Role: Monitors primary 3.3V rail and asserts PFO to initiate graceful shutdown when backup supply engages. Use Value: 0.62V PFI threshold enables precise trip point setting; low 20µA ICC extends uptime in always-on management controllers. |
| White Goods | Telecommunications |
Use Scenario: Smart refrigerator control board with microcontroller and display driver ICs. IC Role / Device Role / Timing Role: Ensures reliable cold-start reset and detects AC line sag affecting 3.3V SMPS output. Use Value: Guaranteed reset down to VCC = 1V prevents erratic behavior during brownouts; SOT23 footprint saves space on compact control boards. |
Use Scenario: Base station remote radio unit (RRU) requiring fail-safe reset under wide temperature (-40°C to +125°C). IC Role / Device Role / Timing Role: Supervises 3.3V FPGA configuration supply and triggers PFO to log fault before power loss. Use Value: Factory-trimmed 2.93V threshold matches 3.3V rail tolerance; industrial temp grade ensures reliability in outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6704SKA-T | Includes 1.6s watchdog timer and WDI input; same dual-reset output and PFI/PFO functionality. | Required where µP activity monitoring is needed alongside voltage supervision (e.g., firmware hang detection). | Select MAX6704SKA-T only if watchdog functionality is mandatory; MAX6708SKA-T offers lower cost and reduced complexity where it is not. |
| TPS3808G33DBVR | Single active-low open-drain reset; 3.08V threshold; no complementary output or PFO; 200ms timeout. | Suitable for basic reset-only applications without power-fail signaling or dual-polarity outputs. | Choose TPS3808G33DBVR for cost-sensitive designs needing only one reset signal and no PFI/PFO; MAX6708SKA-T adds critical redundancy and warning capability. |
Compared with MAX6704SKA-T, MAX6708SKA-T removes watchdog circuitry to reduce BOM count and cost while retaining identical dual-reset and PFI/PFO performance; versus TPS3808G33DBVR, it delivers superior system visibility via complementary outputs and proactive power-fail alerting.
Availability
MAX6708SKA-T is available at Aetrix Electronics and suitable for computers, networking equipment, white goods, and telecommunications infrastructure requiring stable component supply across extended temperature ranges (-40°C to +125°C) and long production lifecycles.
Supply support for MAX6708SKA-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 MAX6701–MAX6708 family targets microprocessor-based systems requiring robust, low-power supply supervision with integrated power-fail warning - optimized for space-constrained, high-reliability embedded control.
FAQ
What is the reset threshold voltage for MAX6708SKA-T?
The MAX6708SKA-T has a factory-trimmed reset threshold of 2.93V (typical) at -40°C to +85°C, with min/max limits of 2.85V and 3.00V respectively. This value is specified for the 'S' suffix and is designed for accurate supervision of +3.3V supply rails. The threshold exhibits a temperature coefficient of 60ppm/°C, ensuring stability across the full -40°C to +125°C operating range. MAX6708SKA-T maintains guaranteed reset assertion down to VCC = 1.2V.
Does MAX6708SKA-T include a watchdog timer?
No, the MAX6708SKA-T does not include a watchdog timer. It is explicitly defined in the datasheet as "the same as the MAX6704 but without the watchdog timer function" and lacks both WDI (watchdog input) and WDO (watchdog output) pins - confirmed by its pin configuration table and functional diagram (Figure 2). This distinguishes it from MAX6704SKA-T and other members of the family like MAX6705–MAX6707. MAX6708SKA-T focuses solely on voltage supervision and power-fail signaling.
What are the functions of the two RESET pins on MAX6708SKA-T?
MAX6708SKA-T provides two independent reset outputs on pins 7 and 8: pin 7 is an active-low push-pull RESET, and pin 8 is an active-high push-pull RESET - complementary signals generated from the same internal reset generator. Both outputs assert simultaneously during power-up, brownout, or manual reset, with identical 140–280ms timeout. This dual-output architecture eliminates the need for external inverters and ensures compatibility with µPs requiring either reset polarity, a key differentiator from single-output supervisors like TPS3808.
How is the power-fail warning implemented on MAX6708SKA-T?
MAX6708SKA-T implements power-fail warning via the PFI (pin 4) and PFO (pin 5) interface. PFI is a high-impedance input referenced to an internal 0.62V comparator; connecting it to a resistor divider on a secondary supply allows setting a custom trip point. When the divided voltage falls below 0.62V, PFO (an active-low push-pull output) asserts immediately (<1µs delay), enabling the µP to execute an orderly shutdown. Unlike watchdog or reset functions, PFI/PFO operates independently and is present on all MAX6704–MAX6708 variants.
What is the supply current consumption of MAX6708SKA-T?
MAX6708SKA-T draws 6µA (typical) to 20µA (maximum) of supply current when VCC < 3.6V and no load is applied - significantly lower than watchdog-equipped variants (e.g., MAX6704 draws 9–25µA). This ultra-low ICC is achieved by omitting the watchdog oscillator and associated circuitry, making MAX6708SKA-T ideal for battery-powered or energy-harvesting systems where standby current directly impacts operational lifetime. Current remains stable across temperature and VCC within spec.
MAX6708SKA-T 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6708SKA-T FAQ
1.How can I place an order for MAX6708SKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6708SKA-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 MAX6708SKA-T reliable?
The price and inventory of MAX6708SKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6708SKA-T is usually 5 days.
3.What payment methods are accepted for MAX6708SKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6708SKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6708SKA-T?
MAX6708SKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6708SKA-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 MAX6708SKA-T?
For technical support, including MAX6708SKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6708SKA-T requirements.
6.How does Aetrix verify that MAX6708SKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6708SKA-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 MAX6708SKA-T meets industry standards.
7.What is the process for return or replacement of MAX6708SKA-T?
All MAX6708SKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6708SKA-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 MAX6708SKA-T part is unused and in its original packaging.
Return procedure for MAX6708SKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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