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Analog Devices Inc./Maxim Integrated MAX6888EETE+
- Part No.:
- MAX6888EETE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX6888EETE+.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,289
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Product details
Overview
The MAX6888EETE+ from Maxim Integrated is a quad-voltage, overvoltage/undervoltage supervisory IC with watchdog timer, active-low open-drain RESET/OV/WDO outputs, 1% threshold accuracy, and 200ms reset timeout - used to monitor 3.3V, 2.5V, 1.8V, and adjustable supplies in multivoltage server and telecom power systems.
For engineers reviewing the MAX6888EETE+ datasheet, MAX6888EETE+ pinout, MAX6888EETE+ application, or MAX6888EETE+ equivalent, key selection criteria include factory-set UV/OV thresholds for three fixed rails plus one adjustable input, -40°C to +85°C operation, 16-pin thin QFN package, and integrated margin disable/manual reset functionality.
Technical Context
The MAX6888EETE+ implements four independent voltage detectors (IN1–IN4), each with factory-trimmed undervoltage and overvoltage thresholds - specifically 3.3V/2.5V/1.8V/Adj per Selector Guide - and supports power sourcing from any monitored rail or VCC via internal diode-ORing. Threshold hysteresis is 0.3% and tempco is 10 ppm/°C.
Its watchdog features dual timeout modes: 102.4s initial period for µP initialization and 1.6s normal period for runtime supervision. All three outputs (RESET, OV, WDO) are active-low, open-drain with 0.4V max VOL at 4mA sink, and RESET remains asserted for 180–220ms after fault clearance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.8V on IN1–IN4 or VCC - enables direct monitoring of common DC-DC outputs without external regulator |
| UV/OV Threshold Accuracy | ±1% at +25°C, ±1.5% over -40°C to +85°C - ensures reliable trip points across temperature for stable system reset behavior |
| Reset Timeout Period | 180–220ms - guarantees sufficient hold time for microprocessor initialization and memory stabilization |
| Watchdog Timeout | Initial: 102.4s; Normal: 1.6s - provides safe boot window followed by tight runtime supervision |
| Input Impedance | 130–300kΩ on IN1–IN4 - minimizes loading on monitored rails while maintaining noise immunity |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom infrastructure environments |
| Package | 16-pin thin QFN (5mm × 5mm × 0.8mm) with exposed pad - supports high-density PCB layouts and thermal dissipation |
Pinout & Package
MAX6888EETE+ uses a 16-pin thin QFN-EP package (5mm × 5mm, 0.8mm height) with exposed paddle connected to GND. Pin 1 is RESET; pins 11–12 are no-connect (N.C.) for MAX6888 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain reset output | Asserts when any monitored voltage falls below UV threshold or MR is pulled low; holds low for ≥180ms after fault clearance |
| 2 (WDO) | Active-low open-drain watchdog output | Asserts if WDI lacks valid edge within 1.6s (normal mode); connects to MR to trigger system reset on timeout |
| 3 (OV) | Active-low open-drain overvoltage output | Asserts when any input exceeds OV threshold; remains low for 25µs after all inputs return to safe range |
| 4 (GND) | Ground reference | Primary return path for internal circuitry and external bypass capacitors; EP pad must be soldered to GND plane |
| 5 (MR) | Manual reset input | Pull low ≥1µs to force RESET assertion; internally pulled up to BP (2.55V) via 10µA current source |
| 6 (MARGIN) | Margin disable control | Pull low to freeze RESET/OV/WDO states during system-level stress testing; overrides MR if both asserted |
| 7 (WDI) | Watchdog timer input | Edge-sensitive (H→L or L→H); internal 10µA pulldown ensures default timeout if unconnected or floating |
| 8 (I.C.) | Internal connection | No external connection required; leave unconnected |
| 9 (VCC) | Internal power supply node | Internally generated from highest of IN1–IN4; bypass to GND with 1µF ceramic capacitor near pin |
| 10 (BP) | Bypass voltage output | 2.55V internal reference for logic and RESET driver; bypass to GND with 1µF ceramic capacitor |
| 13–16 (IN4–IN1) | Monitored voltage inputs | IN1 = 3.3V, IN2 = 2.5V, IN3 = 1.8V, IN4 = adjustable - each monitors both UV and OV conditions |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent voltage detectors | Simultaneously monitors 3.3V, 2.5V, 1.8V, and user-adjustable rail - eliminates need for multiple discrete supervisors |
| Factory-trimmed UV/OV thresholds | Guaranteed ±1% accuracy enables precise power-rail validation without external calibration components |
| Dual-mode watchdog timer | 102.4s initial timeout accommodates full µP boot sequence; 1.6s normal timeout detects runtime lockups |
| Margin disable function | Freezes all outputs during voltage margining tests - prevents spurious resets during system validation |
| Open-drain outputs with 4mA sink capability | Supports flexible voltage-level translation and wired-OR configurations across mixed-supply systems |
Applications
| Server Power Sequencing | Telecom Line Card Monitoring |
|---|---|
Use Scenario: Monitoring 3.3V, 2.5V, 1.8V, and adjustable core voltages across redundant DC-DC converters in 1U rack servers. IC Role / Device Role / Timing Role: Centralized supervisor coordinating power-good signaling, reset assertion, and overvoltage fault response across multiple rails. Use Value: Single-chip solution reduces BOM count versus discrete supervisors and ensures synchronized reset timing across complex power trees. | Use Scenario: Real-time detection of overvoltage faults on 48V backplane-derived supplies and isolated 3.3V/2.5V data-path rails in carrier-grade line cards. IC Role / Device Role / Timing Role: Fault detector triggering immediate OV shutdown and latched reset to prevent damage to sensitive SerDes and PHY ICs. Use Value: 25µs OV timeout and 0.4V VOL at 4mA enable fast, robust protection without external comparators or logic. |
| Industrial Control PLC | Network Switch Power Management |
Use Scenario: Supervising auxiliary 3.3V I/O, 2.5V FPGA core, 1.8V transceiver, and adjustable analog supply in programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: System health monitor asserting RESET on undervoltage events and holding state during margin testing via MARGIN pin. Use Value: -40°C to +85°C rating and 10 ppm/°C tempco ensure consistent trip points across wide ambient ranges. | Use Scenario: Coordinating power-up sequencing and runtime watchdog supervision for multi-core switch ASICs with diverse voltage domains. IC Role / Device Role / Timing Role: Supervisor providing synchronized reset release, continuous voltage monitoring, and fail-safe watchdog reset injection via WDO→MR loop. Use Value: 102.4s initial watchdog timeout allows full ASIC firmware load before enabling strict 1.6s runtime supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6887EETE+ | Six-input variant with IN5/IN6; otherwise identical electrical specs, pinout, and timing | Required where five or six rail monitoring is needed; occupies same PCB footprint but adds two N.C. pins on MAX6888 | Select MAX6887EETE+ only if fifth/sixth voltage rail supervision is required; MAX6888EETE+ saves cost and layout area for quad-rail systems |
| TPS3808G33DBVR | Single 3.3V supervisor with 200ms reset delay; no OV detection, no watchdog, no margin disable | Limited to single-rail monitoring; lacks multi-threshold, overvoltage, and system-test features of MAX6888EETE+ | Use TPS3808G33DBVR only for simple 3.3V-only applications; MAX6888EETE+ is necessary for multirail, OV-aware, or watchdog-enabled designs |
Compared with MAX6887EETE+, the MAX6888EETE+ removes two unused voltage inputs while retaining identical quad-rail thresholds, watchdog, and margin functions - reducing cost and simplifying layout. Versus TPS3808G33DBVR, it delivers comprehensive multirail supervision with overvoltage detection and system-level test support not found in basic single-rail supervisors.
Availability
MAX6888EETE+ is available at Aetrix Electronics and suitable for server power sequencing, telecom line card monitoring, industrial PLCs, and network switch power management requiring stable component supply and long-term industrial temperature support.
Supply support for MAX6888EETE+ 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, communications, and computing applications.
The MAX6887/MAX6888 product line delivers multivoltage supervisory circuits with integrated watchdog and margining for high-reliability power-system monitoring in servers, telecom infrastructure, and embedded control systems.
FAQ
What voltage rails does the MAX6888EETE+ monitor by default?
The MAX6888EETE+ monitors 3.3V (IN1), 2.5V (IN2), 1.8V (IN3), and an adjustable threshold (IN4) as specified in the Selector Guide. Each input provides independent undervoltage and overvoltage detection with factory-trimmed thresholds - no external resistor dividers needed for the first three rails. The MAX6888EETE+ datasheet confirms these nominal values and lists actual UV/OV thresholds in Table 2.
How does the watchdog timer operate in the MAX6888EETE+?
The MAX6888EETE+ watchdog features two distinct timeout periods: an initial 102.4s period for µP boot initialization, followed by a normal 1.6s period for runtime supervision. WDI must receive a valid edge (H→L or L→H) within each timeout window. If missed, WDO asserts low and can be connected to MR to trigger a system reset. This dual-mode behavior is documented in the MAX6888EETE+ functional description and timing diagrams.
Can the MAX6888EETE+ be powered from a dedicated supply instead of monitored rails?
Yes - the MAX6888EETE+ can be powered via the VCC pin using an external 2.7V–5.8V supply, provided VCC is at least 200mV higher than any IN1–IN4 voltage and is ramped up first. Alternatively, it self-powers from the highest of IN1–IN4 (≥2.7V). Internal diode-ORing selects the source automatically. This dual powering scheme is explicitly described in the "Powering the MAX6887/MAX6888" section of the MAX6888EETE+ datasheet.
What is the purpose of the MARGIN pin on the MAX6888EETE+?
The MARGIN pin on the MAX6888EETE+ freezes the states of RESET, OV, and WDO outputs during system-level voltage margining tests - preventing spurious resets when supplies are intentionally driven beyond nominal ranges. When pulled low, it overrides MR and holds outputs steady regardless of input voltage changes or watchdog expiration. This function is detailed in the MAX6888EETE+ pin description and "Margin Output Disable" section.
Does the MAX6888EETE+ require external pullup resistors on its outputs?
Yes - all three outputs (RESET, OV, WDO) are active-low open-drain and require external pullup resistors to their respective rail voltages (e.g., 3.3V or 5V). The MAX6888EETE+ datasheet specifies typical pullup values (e.g., 10kΩ) and notes that connecting OV to MR eliminates the need for a separate pullup on OV. Without pullups, outputs cannot drive high-impedance logic inputs reliably.
MAX6888EETE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 1.8V, 2.5V, 3.3V, Adj
- 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)
MAX6888EETE+ FAQ
1.How can I place an order for MAX6888EETE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6888EETE+ 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 MAX6888EETE+ reliable?
The price and inventory of MAX6888EETE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6888EETE+ is usually 5 days.
3.What payment methods are accepted for MAX6888EETE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6888EETE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6888EETE+?
MAX6888EETE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6888EETE+ 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 MAX6888EETE+?
For technical support, including MAX6888EETE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6888EETE+ requirements.
6.How does Aetrix verify that MAX6888EETE+ is sourced from the original manufacturer or authorized distributors?
All MAX6888EETE+ 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 MAX6888EETE+ meets industry standards.
7.What is the process for return or replacement of MAX6888EETE+?
All MAX6888EETE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6888EETE+, 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 MAX6888EETE+ part is unused and in its original packaging.
Return procedure for MAX6888EETE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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