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Analog Devices Inc./Maxim Integrated MAX6708LKA+T
- Part No.:
- MAX6708LKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6708LKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,060
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Product details
Overview
MAX6708LKA+T from Maxim Integrated is a dual-output microprocessor supervisory circuit in 8-pin SOT23 package, providing active-low and active-high complementary reset outputs (RESET and RESET), a 0.62V precision power-fail comparator input (PFI), and push-pull PFO output - all without watchdog functionality. It monitors +5.0V supply with 4.63V reset threshold, guarantees reset validity down to VCC = 1V, and supports critical µP power monitoring in white goods and telecom systems.
For engineers reviewing the MAX6708LKA+T datasheet, MAX6708LKA+T pinout, MAX6708LKA+T application, or MAX6708LKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing (140ms timeout), true power-fail detection capability (0.62V threshold), and validated alternative options for dual-reset supervision without watchdog.
Technical Context
The MAX6708LKA+T implements a dual-stage reset generator with independent active-low and active-high push-pull outputs driven by a single internal voltage monitor. Its reset assertion is triggered solely by VCC falling below the fixed 4.63V threshold (L-suffix), with no RST_IN1/RST_IN2 or WDI/WDO circuitry - distinguishing it from MAX6704 and excluding triple-voltage or watchdog supervision.
Power-fail detection uses an uncommitted comparator with 0.62V internal reference, enabling external resistive divider configuration on PFI; PFO asserts low when PFI < 0.62V, supporting early warning and orderly shutdown. Reset timeout is fixed at 140ms (typ) with ±60ms variation over temperature, and MR input provides manual reset with 200ns delay and 1µs minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (L-suffix), ±3% tolerance over -40°C to +125°C - sets precise power-up reset point for +5V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms range - ensures µP initialization completes before release |
| Supply Voltage Range | 1.2V to 5.5V - enables valid reset assertion during brownout down to 1.2V |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - allows accurate external voltage monitoring via resistor divider |
| Supply Current | 6–20µA at VCC < 3.6V - ultra-low quiescent draw for battery-backed or energy-sensitive designs |
| Output Drive | Push-pull RESET and RESET - eliminates need for external pull-up resistors, supports direct µP reset/NMI interface |
| MR Input Logic | CMOS-compatible, 0.3×VCC/0.7×VCC thresholds - accepts standard logic-level manual reset signals |
Pinout & Package
Package: 8-pin SOT23 (K8+2 outline), RoHS-compliant lead-free (+T suffix), -40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internal 50kΩ pullup to VCC; forces both RESET and RESET outputs active when pulled low |
| 2 - VCC | Main supply and primary reset monitor input | Drives push-pull outputs; reset triggers when VCC falls below 4.63V |
| 3 - GND | Ground reference | Common return for all internal comparators and output drivers |
| 4 - PFI | Power-fail comparator input | High-impedance node referenced to 0.62V internal reference; accepts external voltage divider |
| 5 - PFO | Power-fail comparator output | Active-low push-pull output; asserts when PFI < 0.62V, usable for µP interrupt or backup control |
| 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; guaranteed low ≤0.4V at VCC ≥1.2V, ISINK = 100µA |
| 8 - RESET | Active-high reset output | Complementary push-pull output; high ≥0.8×VCC when RESET is low, valid to VCC = 1V |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate need for external inverters or level shifters |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state even during deep brownout or battery depletion scenarios |
| 0.62V precision power-fail comparator | Enables accurate early-warning detection of secondary supply collapse using only two external resistors |
| 140ms reset timeout with temperature stability | Provides consistent µP initialization window across full industrial temperature range (-40°C to +125°C) |
| Immunity to short VCC transients | Rejects sub-10µs supply glitches, preventing spurious resets in noisy power environments |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Desktop motherboard power sequencing with dual-reset requirement for CPU and chipset. IC Role / Device Role / Timing Role: Primary supervisory IC generating synchronized active-low and active-high reset pulses during AC power-on and brownout. Use Value: Eliminates discrete logic or dual-supervisor solutions, reducing BOM count and PCB area while guaranteeing correlated reset timing. | Use Scenario: Ethernet switch line card with +5V main rail and +3.3V I/O rail requiring coordinated reset assertion. IC Role / Device Role / Timing Role: Monitors +5V rail only but provides dual-reset outputs to drive separate reset domains with identical timing. Use Value: Enables clean separation of reset paths without skew or timing mismatch between processor and peripheral logic. |
| White Goods | Telecommunications |
Use Scenario: Smart refrigerator control board with microcontroller and display controller needing independent reset polarity. IC Role / Device Role / Timing Role: Single-point reset supervisor delivering active-low reset to MCU and active-high reset to display driver IC. Use Value: Removes need for external inverters or level translators, simplifying design and improving long-term reliability in thermally stressed environments. | Use Scenario: Base station power management unit monitoring +5V backplane supply with early power-fail warning. IC Role / Device Role / Timing Role: Uses PFI/PFO to detect pre-failure condition on +5V rail and trigger controlled shutdown via µP interrupt. Use Value: Provides 1µs PFI-to-PFO propagation delay and 6mV hysteresis for noise-immune power-fail signaling in RF-noisy enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6704LKA+T | Includes reset-based watchdog timer with 1.6s timeout; same dual-reset outputs and 4.63V threshold | Required where µP activity monitoring and automatic recovery from lockup are needed | Select MAX6704LKA+T if watchdog functionality is mandatory; MAX6708LKA+T is preferred for pure reset supervision with lower complexity |
| TPS3808G33DBVR | Single active-low open-drain reset output; 3.3V threshold; no complementary output or PFO | Suitable only for basic reset generation without power-fail warning or dual-polarity signaling | Choose TPS3808G33DBVR for cost-sensitive, single-rail +3.3V systems without PFI/PFO or dual outputs |
Compared with MAX6704LKA+T, MAX6708LKA+T removes watchdog circuitry to reduce quiescent current (6–20µA vs. 9–25µA) and simplify timing behavior; compared with TPS3808G33DBVR, it adds dual-reset polarity, PFI/PFO, and higher-voltage support - making it uniquely suited for +5V systems requiring coordinated reset signaling and power-fail warning.
Availability
MAX6708LKA+T is available at Aetrix Electronics and suitable for computers, networking equipment, and telecommunications infrastructure requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6708LKA+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 power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6701–MAX6708 family targets compact, reliable µP supervision in space-constrained systems - emphasizing low quiescent current, wide temperature operation, and flexible reset/power-fail configurations without external components.
FAQ
What is the reset threshold voltage of the MAX6708LKA+T?
The MAX6708LKA+T has a fixed reset threshold of 4.63V (L-suffix), with ±3% tolerance over the full -40°C to +125°C temperature range. This value is factory-trimmed and guaranteed in production test, ensuring precise +5V system supervision without external adjustment. The threshold applies exclusively to the VCC pin; no RST_IN1 or RST_IN2 inputs are present in the MAX6708LKA+T variant.
Does the MAX6708LKA+T include a watchdog timer function?
No, the MAX6708LKA+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." Unlike MAX6701–MAX6707 variants, MAX6708LKA+T omits WDI and WDO pins entirely - confirmed by its pinout (Pin 6 = N.C.) and functional diagram. Watchdog capability requires selecting MAX6704LKA+T instead.
What are the functions of Pins 7 and 8 on the MAX6708LKA+T?
Pin 7 is the active-low RESET output, and Pin 8 is the active-high RESET output - both implemented as push-pull drivers. They are complementary signals asserted simultaneously when VCC falls below 4.63V or MR is pulled low. Neither output requires external pull-up resistors, and both remain valid down to VCC = 1V, enabling robust reset signaling even during severe brownout conditions.
Can the MAX6708LKA+T monitor voltages other than VCC?
Yes, the MAX6708LKA+T can monitor secondary voltages using its PFI (Pin 4) input. By connecting an external resistive divider to PFI, designers can configure early power-fail detection for any supply - e.g., +3.3V or +2.5V rails - with trip point accuracy determined by the 0.62V internal reference and resistor tolerance. PFO (Pin 5) then provides an active-low push-pull output signaling the event.
What is the reset timeout period of the MAX6708LKA+T, and how does it vary with temperature?
The MAX6708LKA+T features a nominal reset timeout period of 140ms, with a specified range of 120ms to 300ms over the full -40°C to +125°C operating temperature range. This variation is inherent to the internal RC timing network and is fully characterized in the Electrical Characteristics table. No external components are required to set or adjust this delay.
MAX6708LKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, 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
MAX6708LKA+T FAQ
1.How can I place an order for MAX6708LKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6708LKA+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 MAX6708LKA+T reliable?
The price and inventory of MAX6708LKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6708LKA+T is usually 5 days.
3.What payment methods are accepted for MAX6708LKA+T?
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MAX6708LKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6708LKA+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 MAX6708LKA+T?
For technical support, including MAX6708LKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6708LKA+T requirements.
6.How does Aetrix verify that MAX6708LKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6708LKA+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 MAX6708LKA+T meets industry standards.
7.What is the process for return or replacement of MAX6708LKA+T?
All MAX6708LKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6708LKA+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 MAX6708LKA+T part is unused and in its original packaging.
Return procedure for MAX6708LKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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