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Analog Devices Inc./Maxim Integrated MAX6708RKA
- Part No.:
- MAX6708RKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6708RKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:351
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Product details
Overview
The MAX6708RKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing dual active-low/high push-pull reset outputs, power-fail monitoring (0.62V threshold), and manual reset input - but no watchdog timer. It guarantees valid reset assertion down to VCC = 1V and supports precise supervision of +5.0V, +3.3V, +3.0V, or +2.5V supplies in automotive and industrial control systems.
For engineers reviewing the MAX6708RKA datasheet, MAX6708RKA pinout, MAX6708RKA application, or MAX6708RKA equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset timeout (140ms), power-fail comparator behavior, and validated alternative options for µP reset supervision without watchdog functionality.
Technical Context
The MAX6708RKA implements a dual-stage reset generator with independent active-low and active-high push-pull outputs, both asserted simultaneously during VCC brownout, power-up, or manual reset. Its internal 0.62V reference enables externally adjustable power-fail detection via PFI, with PFO delivering an open-drain or push-pull active-low signal.
Unlike MAX6701–MAX6707 variants, the MAX6708RKA omits the watchdog timer and WDI/WDO circuitry entirely - confirmed by functional diagram Figure 2 and Selector Guide. It retains full MR debouncing, 140ms reset timeout, and guaranteed reset validity down to VCC = 1V, making it suitable for deterministic reset-only supervision where watchdog oversight is unnecessary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 140ms typical; ensures µP remains held in reset long enough for stable power rail settling after brownout recovery. |
| VCC Reset Threshold | 4.63V (R suffix); precise trip point for +5V supply monitoring with ±3% tolerance over -40°C to +125°C. |
| Power-Fail Threshold | 0.62V (typ); fixed internal reference enabling accurate early-warning detection of secondary supply collapse. |
| Supply Voltage Range | 1.2V to 5.5V; supports operation across brownout conditions while maintaining reset assertion integrity. |
| Reset Output Type | Dual active-low/active-high push-pull; eliminates need for external inverters or pull-ups in bidirectional reset signaling. |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial embedded environments. |
Pinout & Package
Package: 8-pin SOT23-8, 1.95mm × 2.80mm footprint, lead-free compatible (suffix +T), JEDEC MO178 BA compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; asserts both RESET and RESET outputs when pulled low. |
| 2 - VCC | Main supply voltage input | Primary power source for internal comparators and push-pull outputs; also monitored for reset generation. |
| 3 - GND | Ground reference | Common return path for all internal circuits and output drivers. |
| 4 - PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; used with external resistor divider to monitor secondary supplies. |
| 5 - PFO | Power-fail output | Active-low push-pull output asserting when PFI falls below 0.62V; can interrupt µP or trigger orderly shutdown. |
| 6 - N.C. | No connection | Not internally bonded; must be left floating or tied to GND/VCC per layout guidelines. |
| 7 - RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at VCC ≥ 4.25V; guaranteed low ≤ 0.4V down to VCC = 1V. |
| 8 - RESET | Active-high reset output | Complementary push-pull output; high-state valid down to VCC = 1V, enabling direct interface with logic requiring active-high reset. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull signals eliminate external inversion and reduce BOM count. |
| 0.62V precision power-fail comparator | Enables reliable early-warning detection of auxiliary supply collapse using only two external resistors. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, critical for fail-safe automotive and industrial systems. |
| 140ms reset timeout delay | Provides sufficient hold time for µP clock stabilization and peripheral power sequencing after supply recovery. |
| Immunity to short falling VCC transients | Prevents false resets caused by sub-100ns supply glitches, improving system robustness in noisy environments. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring main 5V supply and 3.3V I/O rail in engine management systems subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Dual-reset supervisor ensuring µP enters known state during battery voltage sag and provides PFO-triggered firmware save before shutdown. Use Value: Prevents corrupted flash writes and undefined µP states during transient brownouts, meeting ISO 16750-2 pulse 4 requirements. | Use Scenario: Supervising fieldbus controller power rails in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Generating synchronized active-low and active-high reset pulses for FPGA configuration and microcontroller boot sequence. Use Value: Eliminates need for discrete inverters or level shifters, reducing PCB area and improving timing margin between reset domains. |
| White Goods Main Control Board | Telecom Power Management Unit |
Use Scenario: Ensuring safe startup and fault recovery in washing machine main boards with multiple DC-DC converters. IC Role / Device Role / Timing Role: Detecting failure of 2.5V core supply via PFI divider and asserting both RESET outputs to halt motor drive and UI subsystems. Use Value: Enables graceful shutdown before capacitor discharge, preventing mechanical damage from uncontrolled motor coast-down. | Use Scenario: Supervising redundant 3.3V backup supplies in telecom line cards where continuous operation is mandatory. IC Role / Device Role / Timing Role: Providing failover-ready reset signaling with PFO connected to hot-swap controller to initiate controlled switchover. Use Value: Reduces mean time to recovery (MTTR) by triggering automatic supply handoff within 140ms of primary rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6704RKA | Includes reset-based watchdog timer; same dual reset outputs and PFI/PFO architecture. | Required where µP activity monitoring is needed alongside power supervision. | Select MAX6704RKA if watchdog timeout-triggered reset pulses are required; MAX6708RKA is preferred when only deterministic reset is needed. |
| TPS3808G33DBVR | Single active-low open-drain reset; no active-high output or PFO; 3.3V fixed threshold only. | Limited to single-rail 3.3V systems without power-fail warning capability. | Choose TPS3808G33DBVR only for cost-sensitive, single-threshold applications lacking PFI/PFO or dual-output needs. |
Compared with MAX6704RKA and TPS3808G33DBVR, the MAX6708RKA uniquely delivers dual complementary reset outputs and full PFI/PFO functionality without watchdog overhead - optimizing reliability and design simplicity for reset-critical, non-watchdog applications.
Availability
MAX6708RKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, white goods main boards, and telecom power management units requiring stable component supply across extended temperature ranges.
Supply support for MAX6708RKA 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family targets microprocessor supervision in space-constrained, high-reliability systems - delivering integrated reset, power-fail warning, and manual reset in ultra-small SOT23 packages without compromising accuracy or temperature range.
FAQ
What is the reset timeout period of the MAX6708RKA?
The MAX6708RKA features a typical reset timeout period of 140ms. This delay ensures the microprocessor remains held in reset long enough for power rails to stabilize after power-up or brownout recovery. The timeout is guaranteed between 120ms and 300ms over the full -40°C to +125°C operating temperature range, as specified in the Electrical Characteristics table.
Does the MAX6708RKA include a watchdog timer function?
No, the MAX6708RKA does not include a watchdog timer. It is explicitly defined as "the same as the MAX6704 but without the watchdog timer function" in the General Description. Unlike MAX6701–MAX6707 variants, the MAX6708RKA lacks WDI and WDO pins and associated circuitry - confirmed by its pin configuration (N.C. on pin 6) and functional diagram Figure 2.
What are the reset output types supported by the MAX6708RKA?
The MAX6708RKA provides dual complementary reset outputs: pin 7 is an active-low push-pull RESET, and pin 8 is an active-high push-pull RESET. Both outputs are asserted simultaneously during VCC brownout, power-up, or MR activation. This eliminates the need for external inverters and supports systems requiring either polarity directly.
How is the power-fail warning implemented in the MAX6708RKA?
The MAX6708RKA implements power-fail warning using the PFI and PFO pins. PFI is a high-impedance input referenced to an internal 0.62V threshold; connecting it to a resistor divider on a secondary supply allows early detection of voltage collapse. When PFI falls below 0.62V, PFO - an active-low push-pull output - asserts to signal the µP for orderly shutdown.
What is the operating voltage range for the MAX6708RKA?
The MAX6708RKA operates from VCC = 1.2V to 5.5V. Crucially, it guarantees valid reset output behavior down to VCC = 1V - meaning both RESET outputs remain functional and well-defined even during severe brownout conditions, supporting fail-safe operation in automotive and industrial environments.
MAX6708RKA 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6708RKA FAQ
1.How can I place an order for MAX6708RKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6708RKA 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 reliable?
The price and inventory of MAX6708RKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6708RKA is usually 5 days.
3.What payment methods are accepted for MAX6708RKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6708RKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6708RKA?
MAX6708RKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6708RKA 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?
For technical support, including MAX6708RKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6708RKA requirements.
6.How does Aetrix verify that MAX6708RKA is sourced from the original manufacturer or authorized distributors?
All MAX6708RKA 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 meets industry standards.
7.What is the process for return or replacement of MAX6708RKA?
All MAX6708RKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6708RKA, 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 part is unused and in its original packaging.
Return procedure for MAX6708RKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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