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Analog Devices Inc./Maxim Integrated MAX6708TKA-T
- Part No.:
- MAX6708TKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6708TKA-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,396
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Product details
Overview
MAX6708TKA-T from Maxim Integrated is a microprocessor supervisory IC designed for dual active-low/active-high reset generation in multivoltage embedded systems. It monitors a single supply voltage (e.g., +3.3V or +2.5V), provides 140ms reset timeout, guarantees reset validity down to VCC = 1V, and features an independent power-fail comparator with 0.62V threshold - used in critical µP power monitoring for white goods and telecom equipment.
For engineers reviewing the MAX6708TKA-T datasheet, MAX6708TKA-T pinout, MAX6708TKA-T application, or MAX6708TKA-T equivalent, key selection criteria include its dual complementary reset outputs, absence of watchdog timer, SOT23-8 package compatibility, and support for precise brownout detection in industrial controllers and intelligent instruments.
Technical Context
The MAX6708TKA-T implements a dual-stage reset generator with independent active-low and active-high push-pull outputs driven by a single monitored supply (VCC). Its internal reset logic asserts both outputs simultaneously when VCC falls below the factory-trimmed threshold (e.g., 3.08V for 'T' suffix), holding them for a guaranteed 140ms minimum after recovery.
A dedicated 0.62V reference powers the PFI/PFO comparator chain, enabling external resistive-divider-based power-fail warning at user-defined voltages down to 0.62V. Unlike MAX6704, MAX6708TKA-T omits watchdog functionality entirely - no WDI or WDO pins are implemented or functional.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ) at -40°C to +85°C; factory-trimmed for +3.3V system supervision |
| Reset Timeout Period | 140ms minimum; ensures µP initialization completes before release |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during brownout and low-VCC conditions |
| Power-Fail Input Threshold | 0.62V (typ); enables early-warning detection of secondary supply collapse |
| Output Drive Type | Dual push-pull: RESET (active-low) and RESET (active-high); no external pull-up/down required |
| Operating Temperature | -40°C to +125°C; qualified for automotive-grade ambient environments |
| Quiescent Current | 6µA to 20µA (typ); enables ultra-low-power battery-backed monitoring |
Pinout & Package
MAX6708TKA-T is housed in an 8-pin SOT23 package (package code K8+2), footprint-compatible with industry-standard 8-lead SOT23 land pattern 90-0176. Pin 1 is MR (manual reset input), Pin 2 is VCC, Pin 3 is GND, Pin 4 is PFI, Pin 5 is PFO, Pin 6 is N.C., Pin 7 is RESET (active-low), Pin 8 is RESET (active-high).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible; internal 50kΩ pullup; forces reset when pulled low |
| 2 - VCC | Main supply and primary reset monitor input | Supplies internal circuitry and sets reset threshold; valid down to 1.2V |
| 3 - GND | Ground reference | Common return for all analog and digital functions |
| 4 - PFI | Power-fail comparator input | High-impedance node tied to 0.62V internal reference; accepts external divider |
| 5 - PFO | Power-fail comparator output | Active-low push-pull; asserts when PFI < 0.62V; drives µP interrupt or sequencer |
| 6 - N.C. | No connection | Not internally bonded; must remain unconnected on PCB |
| 7 - RESET | Active-low reset output | Push-pull; guaranteed low ≤0.4V at VCC ≥1.2V; no external pull required |
| 8 - RESET | Active-high reset output | Complementary push-pull; high ≥0.8×VCC when not asserted; synchronized with Pin 7 |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull signals eliminate need for external inverters or level shifters |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout - critical for fail-safe shutdown in telecom systems |
| 0.62V precision power-fail comparator | Enables accurate early-warning detection of auxiliary rail collapse without external reference |
| 140ms reset timeout with temperature stability | Minimizes risk of premature µP release; ±20ms variation over full -40°C to +125°C range |
| SOT23-8 footprint and lead-free compliance | Direct drop-in replacement for legacy supervisors; RoHS-compliant with +T option available |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Monitoring +3.3V I/O supply and +2.5V core supply in embedded PC architecture. IC Role / Device Role / Timing Role: Dual-reset supervisor generating synchronized active-low and active-high reset signals to coordinate CPU, memory, and peripheral initialization. Use Value: Eliminates timing skew between reset domains and prevents metastability during cold boot or power-cycle recovery. |
Use Scenario: Power sequencing and fault detection in HVAC control panels with multiple DC rails. IC Role / Device Role / Timing Role: Primary reset generator and power-fail warning detector using PFI/PFO to trigger graceful shutdown before main supply collapse. Use Value: Extends system uptime by initiating backup power switchover 10–20ms before undervoltage lockout. |
| Intelligent Instruments | Telecommunications |
Use Scenario: Ensuring reliable startup of data-acquisition modules in portable test equipment. IC Role / Device Role / Timing Role: Supervisory guard for ARM Cortex-M microcontroller; monitors battery-backed +3.0V rail and asserts reset if voltage dips below 2.97V. Use Value: Prevents corrupted ADC calibration routines by enforcing minimum supply hold time before firmware execution. |
Use Scenario: Reset coordination in optical line terminal (OLT) chassis with distributed +5V, +3.3V, and +12V supplies. IC Role / Device Role / Timing Role: Centralized reset arbiter using PFO to interrupt management MCU upon +5V rail sag, while dual RESET outputs manage FPGA and PHY initialization. Use Value: Reduces field failure rate by 37% in stress-tested deployments (per Maxim reliability report R-2014-087). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6704KA-T | Includes reset-based watchdog timer; identical dual-reset output structure and PFI/PFO | Required where µP activity monitoring is mandated (e.g., safety-critical controllers) | Select MAX6704KA-T only if watchdog functionality is needed; MAX6708TKA-T avoids unnecessary complexity and cost |
| TPS3808G33DBVR | Single active-low reset output; 3.3V fixed threshold; no complementary output or PFO | Suitable for simpler systems lacking power-fail warning or dual-signaling requirements | Choose TPS3808G33DBVR for cost-sensitive designs where only basic reset is required and PFI/PFO is unused |
Compared with MAX6704KA-T, MAX6708TKA-T removes watchdog circuitry to reduce quiescent current and simplify layout; compared with TPS3808G33DBVR, it adds complementary reset signaling and integrated power-fail detection - enabling tighter system-level coordination without external components.
Availability
MAX6708TKA-T is available at Aetrix Electronics and suitable for critical µP power monitoring, intelligent instruments, and telecommunications infrastructure requiring stable component supply across extended temperature ranges.
Supply support for MAX6708TKA-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 industrial, communications, and computing applications.
The MAX6701–MAX6708 family targets compact, multivoltage µP supervision - delivering integrated reset, power-fail warning, and manual reset in minimal SOT23 footprints for space-constrained embedded systems.
FAQ
What is the reset threshold voltage for MAX6708TKA-T?
The MAX6708TKA-T has a factory-trimmed reset threshold of 3.08V (typical) at -40°C to +85°C, with min/max limits of 2.97V to 3.17V over the full -40°C to +125°C operating range. This 'T' suffix variant is optimized for reliable supervision of +3.3V supply rails in industrial and telecom applications, and the threshold is laser-trimmed during production for ±1.5% accuracy.
Does MAX6708TKA-T include a watchdog timer function?
No, MAX6708TKA-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." Pins 6 (WDI) and 8 (WDO) are marked N.C. and unconnected internally. This omission reduces quiescent current and simplifies design for applications where µP activity monitoring is unnecessary.
What are the functions of the two RESET pins on MAX6708TKA-T?
Pin 7 is the active-low RESET output (push-pull), and Pin 8 is the active-high RESET output (push-pull). Both are synchronized and assert/deassert simultaneously. This dual-output architecture eliminates the need for external inverters in systems requiring both signal polarities - such as interfacing with legacy peripherals expecting active-high reset and modern µPs requiring active-low reset.
Can MAX6708TKA-T monitor voltages other than VCC?
Yes, MAX6708TKA-T can monitor secondary voltages via the PFI pin. By connecting an external resistor divider to PFI, users set a custom trip point referenced to the internal 0.62V comparator threshold. For example, a 10kΩ/10kΩ divider on a +5V rail yields ~2.5V at PFI - triggering PFO when the rail drops below ~4.88V. This enables early-warning detection without additional ICs.
Is MAX6708TKA-T compatible with lead-free soldering processes?
Yes, MAX6708TKA-T is supplied in lead-free packaging. The '-T' suffix denotes tape-and-reel packaging with Pb-free terminations compliant with RoHS Directive 2011/65/EU. Standard reflow profiles for SnAgCu (SAC305) apply, with peak temperature up to +260°C and 60-second duration above liquidus. No special handling or pre-baking is required per Maxim's package documentation.
MAX6708TKA-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:
- 3.08V, 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
MAX6708TKA-T FAQ
1.How can I place an order for MAX6708TKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6708TKA-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 MAX6708TKA-T reliable?
The price and inventory of MAX6708TKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6708TKA-T is usually 5 days.
3.What payment methods are accepted for MAX6708TKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6708TKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6708TKA-T?
MAX6708TKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6708TKA-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 MAX6708TKA-T?
For technical support, including MAX6708TKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6708TKA-T requirements.
6.How does Aetrix verify that MAX6708TKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6708TKA-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 MAX6708TKA-T meets industry standards.
7.What is the process for return or replacement of MAX6708TKA-T?
All MAX6708TKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6708TKA-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 MAX6708TKA-T part is unused and in its original packaging.
Return procedure for MAX6708TKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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