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Analog Devices Inc./Maxim Integrated MAX6888RETE+TW
- Part No.:
- MAX6888RETE+TW
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX6888RETE+TW.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,137
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Product details
Overview
The MAX6888RETE+TW from Maxim Integrated is a quad-voltage, overvoltage/undervoltage supervisory IC with watchdog timer functionality, 10% threshold tolerance, ±1.5% threshold accuracy over -40°C to +85°C, and three active-low open-drain outputs (RESET, OV, WDO). It monitors four adjustable input voltages down to 0.527V UV / 0.673V OV and supports multivoltage server power-rail monitoring.
For engineers reviewing the MAX6888RETE+TW datasheet, MAX6888RETE+TW pinout, MAX6888RETE+TW application, or MAX6888RETE+TW equivalent, this device delivers precise rail supervision for telecom and storage systems where configurable thresholds, watchdog timeout flexibility (102.4s initial / 1.6s normal), and margin-disable capability are critical selection criteria.
Technical Context
The MAX6888RETE+TW implements independent voltage-detection comparators per IN1–IN4 with factory-set undervoltage and overvoltage thresholds referenced to a 0.6V internal reference, enabling user-adjustable monitoring via external resistor dividers. Its watchdog logic features dual-mode timing: an extended 102.4s initial timeout for processor initialization, followed by a 1.6s normal timeout for runtime supervision.
All three outputs-RESET (200ms timeout), OV (25µs timeout), and WDO-are active-low open-drain with 0.4V max VOL at 4mA sink current. The device powers itself from the highest of IN1–IN4 (≥2.7V) or VCC, and includes internal 10µA pullup/pulldown sources on MR, MARGIN, and WDI for simplified interface design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Count | Four voltage-detector inputs (IN1–IN4); all configured as adjustable (Adj) per Selector Guide |
| UV/OV Thresholds | 0.527V undervoltage / 0.673V overvoltage per input - enables monitoring of sub-1V rails like 0.85V CPU cores |
| Threshold Accuracy | ±1.5% over full -40°C to +85°C range - ensures reliable trip points across industrial temperature operation |
| Watchdog Timeout | 102.4s initial / 1.6s normal - accommodates boot firmware execution then tight runtime fault detection |
| RESET Timeout | 180–220ms - provides sufficient hold time for system-level reset sequencing and power stabilization |
| Supply Range | 2.7V to 5.8V on any IN1–IN4 or VCC - supports direct connection to common DC-DC output rails |
| Output Type | Three active-low open-drain outputs (RESET, OV, WDO) - allows wired-OR configuration and level translation |
Pinout & Package
MAX6888RETE+TW is housed in a 5mm × 5mm × 0.8mm, 16-pin thin QFN package with exposed pad (EP) internally connected to GND. RoHS-compliant, lead(Pb)-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; asserts when any INx falls below UV threshold or MR is pulled low; held low for 200ms after fault clearance |
| 2 | WDO | Active-low open-drain watchdog output; goes low if WDI lacks valid edge within timeout; used to trigger RESET when connected to MR |
| 3 | OV | Active-low open-drain overvoltage output; asserts when any INx exceeds OV threshold; remains low for 25µs after fault clearance |
| 4 | GND | Power and signal reference ground; EP (exposed pad) is internally tied to this node |
| 5 | MR | Manual reset input; internally pulled up to BP (2.55V) via 10µA current source; 1µs minimum pulse width required to assert RESET |
| 6 | MARGIN | Margin disable input; when low, freezes RESET/OV/WDO state during system testing; overrides MR if both asserted |
| 7 | WDI | Watchdog timer input; internally pulldown via 10µA current sink; requires high-to-low or low-to-high transition within timeout period |
| 8 | I.C. | Internal connection - no external connection required |
| 9 | VCC | Internal power-supply voltage node; equals highest of IN1–IN4; bypass to GND with 1µF ceramic capacitor |
| 10 | BP | Bypass voltage output (2.55V nominal); powers internal logic; bypass to GND with 1µF ceramic capacitor |
| 11, 12 | N.C. | No connection - not internally connected (MAX6888 has only 4 detector inputs vs. MAX6887's 6) |
| 13–16 | IN4–IN1 | Adjustable voltage-monitor inputs; each monitors both UV (0.527V) and OV (0.673V); bypass to GND with 0.1µF capacitor for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Quad adjustable voltage detectors | Four INx inputs preset to 0.527V UV / 0.673V OV - supports flexible rail monitoring without external references |
| 10% threshold tolerance option | Enables cost-optimized designs where tighter 5% tolerance is unnecessary; confirmed for MAX6888RETE variant |
| Independent watchdog timing modes | 102.4s initial timeout for safe boot initialization, then 1.6s normal timeout - eliminates need for external timing components |
| Margin-disable function | MARGIN input holds RESET/OV/WDO in current state during voltage-margin testing - prevents spurious resets during validation |
| Integrated bias sources | 10µA internal pullup on MR/MARGIN and pulldown on WDI - reduces external component count and PCB footprint |
Applications
| Telecom Power Management | Enterprise Storage Controller |
|---|---|
|
Use Scenario: Monitoring multiple DC-DC outputs (12V, 5V, 3.3V, 1.8V) in a line-card power subsystem subject to load transients and hot-swap events. IC Role / Device Role / Timing Role: Supervisory IC providing coordinated UV/OV fault detection, manual reset initiation, and watchdog supervision of control MCU. Use Value: Prevents system lockup by asserting RESET within 20µs of rail deviation and holding it for 200ms to ensure clean restart. |
Use Scenario: Ensuring reliable power sequencing and fault response in RAID controller boards with mixed-voltage ASICs and memory interfaces. IC Role / Device Role / Timing Role: Quad-rail supervisor with margin-disable for validating voltage tolerance margins during production test. Use Value: Enables in-system margin testing without disrupting reset state - critical for validating 1.2V/1.0V core rail robustness. |
| Network Switch ASIC Power | Industrial Edge Compute Module |
|
Use Scenario: Supervising sub-1V core supplies (e.g., 0.85V FPGA I/O banks) alongside higher-voltage auxiliary rails in high-density switch fabric modules. IC Role / Device Role / Timing Role: Adjustable-threshold supervisor detecting UV faults on low-voltage rails while providing watchdog coverage for management processor. Use Value: 0.527V UV threshold allows direct monitoring of 0.85V rails with 30% headroom - avoids need for external level-shifting circuitry. |
Use Scenario: Providing fail-safe power monitoring in fanless, convection-cooled edge gateways operating continuously in uncontrolled ambient environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Temperature-stable supervisory IC with ±1.5% threshold accuracy and 16-pin QFN thermal performance. Use Value: Maintains reliable trip points across full industrial temperature range - eliminates field failures due to threshold drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6888METE+TW | Same 4-input quad supervisor, but with 5% threshold tolerance and fixed 3.3V/2.5V/1.8V/Adj thresholds - no sub-1V UV capability | Targeted at standard 3.3V/2.5V/1.8V rail monitoring; unsuitable for <1V core supplies | Select MAX6888METE+TW only when tighter 5% tolerance is required and all monitored rails are ≥1.5V |
| TPS3808G33DBVR | Single-channel 3.3V supervisor with 200ms reset timeout; no OV detection, no watchdog, no adjustable thresholds | Limited to single-rail monitoring; lacks multirail coordination and fault isolation capabilities | Choose TPS3808G33DBVR only for simple, cost-sensitive single-rail applications where quad supervision is unnecessary |
Compared with MAX6888METE+TW and TPS3808G33DBVR, the MAX6888RETE+TW uniquely supports four fully adjustable sub-1V rails with integrated watchdog and overvoltage detection - making it the only option for compact, high-reliability multirail supervision in space-constrained telecom and storage platforms.
Availability
MAX6888RETE+TW is available at Aetrix Electronics and suitable for telecom infrastructure, enterprise storage systems, and network switch ASIC power monitoring requiring stable component supply and long-term industrial temperature support.
Supply support for MAX6888RETE+TW 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, communications, and computing applications.
The MAX6887/MAX6888 product line delivers multivoltage power-supply supervision with integrated watchdog timers and margin-disable functionality - engineered specifically for high-availability telecom, server, and storage systems requiring coordinated rail monitoring and fault recovery.
FAQ
What is the undervoltage threshold for each input on the MAX6888RETE+TW?
The MAX6888RETE+TW has all four inputs (IN1–IN4) configured as adjustable, with a factory-set undervoltage threshold of 0.527V per input. This value is derived from the 10% tolerance version in Table 2 of the datasheet and enables direct monitoring of sub-1V rails such as 0.85V FPGA cores. The MAX6888RETE+TW does not support fixed-voltage thresholds like 3.3V or 2.5V.
Does the MAX6888RETE+TW support overvoltage detection, and what is its threshold?
Yes, the MAX6888RETE+TW provides overvoltage detection on all four inputs with a factory-set threshold of 0.673V per input. This OV threshold is paired with the 0.527V UV threshold and maintains ±1.5% accuracy over -40°C to +85°C. The OV output asserts within 25µs of threshold violation and remains active for that duration after fault clearance.
How does the watchdog timer operate on the MAX6888RETE+TW?
The MAX6888RETE+TW features a dual-mode watchdog timer: an initial timeout of 102.4s for processor boot initialization, followed by a normal timeout of 1.6s for runtime supervision. WDO asserts low if WDI fails to toggle within the active timeout period. When WDO is connected to MR, it triggers a full RESET assertion with 200ms hold time - clearing the watchdog and ensuring deterministic recovery.
Can the MAX6888RETE+TW be powered from a dedicated supply rail?
Yes, the MAX6888RETE+TW can be powered either from one of its monitored inputs (IN1–IN4) or from the VCC pin. To use VCC, it must be ≥200mV higher than any applied INx voltage and brought up first. Internally, VCC equals the highest of IN1–IN4 when externally unpowered. The device draws 0.9–1.2mA typical supply current across its 2.7V–5.8V operating range.
What is the purpose of the MARGIN input on the MAX6888RETE+TW?
The MARGIN input on the MAX6888RETE+TW holds RESET, OV, and WDO in their current asserted or deasserted states during system-level voltage-margin testing. When pulled low, it overrides MR and freezes output behavior - allowing engineers to validate system stability at ±5% or ±10% rail deviations without triggering unintended resets. An internal 10µA current source pulls MARGIN to BP when left unconnected.
MAX6888RETE+TW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 180ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX6888RETE+TW FAQ
1.How can I place an order for MAX6888RETE+TW through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6888RETE+TW 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 MAX6888RETE+TW reliable?
The price and inventory of MAX6888RETE+TW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6888RETE+TW is usually 5 days.
3.What payment methods are accepted for MAX6888RETE+TW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6888RETE+TW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6888RETE+TW?
MAX6888RETE+TW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6888RETE+TW 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 MAX6888RETE+TW?
For technical support, including MAX6888RETE+TW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6888RETE+TW requirements.
6.How does Aetrix verify that MAX6888RETE+TW is sourced from the original manufacturer or authorized distributors?
All MAX6888RETE+TW 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 MAX6888RETE+TW meets industry standards.
7.What is the process for return or replacement of MAX6888RETE+TW?
All MAX6888RETE+TW units undergo pre-shipment inspection (PSI). If there is an issue with MAX6888RETE+TW, 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 MAX6888RETE+TW part is unused and in its original packaging.
Return procedure for MAX6888RETE+TW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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