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Analog Devices Inc./Maxim Integrated MAX6888HETE+
- Part No.:
- MAX6888HETE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX6888HETE+.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,471
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Product details
Overview
MAX6888HETE+ from Maxim Integrated is a quad-voltage supervisory IC with factory-set undervoltage/overvoltage detection on four inputs (IN1–IN4), active-low open-drain RESET/OV/WDO outputs, 1% threshold accuracy, and dual-mode watchdog timer (102.4s initial / 1.6s normal timeout). It monitors critical supply rails in multivoltage server power systems.
For engineers reviewing the MAX6888HETE+ datasheet, MAX6888HETE+ pinout, MAX6888HETE+ application, or MAX6888HETE+ equivalent, this page delivers verified specifications, exact pin functions, real-world timing behavior, and validated alternative options for telecom and storage system design.
Technical Context
The MAX6888HETE+ implements independent voltage detectors per input with ±1.5% threshold accuracy over –40°C to +85°C, each providing simultaneous undervoltage and overvoltage monitoring. Its virtual diode-OR power architecture selects the highest of IN1–IN4 (≥2.7V) to self-power internal circuitry, eliminating need for external VCC bias in most configurations.
It integrates a configurable watchdog timer with two distinct timeout modes: 102.4s initial period for µP initialization, then automatic transition to 1.6s normal period upon first WDI toggle. WDO assertion triggers RESET when connected to MR, enabling autonomous fault recovery without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Count | 4 dedicated voltage-monitoring inputs (IN1–IN4); IN5/IN6 not present on MAX6888 variant |
| Threshold Accuracy | ±1.5% over full temperature range - ensures reliable trip points across industrial environments |
| RESET Timeout | 180–220ms - guarantees sufficient hold time for complete system reset sequencing |
| Watchdog Timeout | 102.4s (initial), 1.6s (normal) - supports boot-time safety margin and runtime supervision |
| Output Type | Three active-low open-drain outputs (RESET, OV, WDO) - enables wired-OR logic and flexible pullup voltage selection |
| Supply Range | 2.7V to 5.8V on any IN1–IN4 - allows direct monitoring of common DC-DC output rails without auxiliary supply |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature industrial and telecom infrastructure use |
Pinout & Package
MAX6888HETE+ uses a 5mm × 5mm × 0.8mm, 16-pin thin QFN package with exposed pad (EP) internally connected to GND. Pinout matches MAX6888 functional variant (no IN5/IN6 pins; pins 11–12 are N.C.).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; asserts when any IN falls below UV threshold or MR is pulled low; holds low ≥180ms after fault clearance |
| 2 | WDO | Active-low open-drain watchdog output; asserts if WDI fails to toggle within timeout; used to drive MR for autonomous reset |
| 3 | OV | Active-low open-drain overvoltage output; asserts when any IN exceeds OV threshold; clears after 25µs post-fault |
| 4 | GND | Ground reference for all analog and digital circuitry; EP pad must be soldered to PCB ground plane for thermal and electrical integrity |
| 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 | Reset disable input; overrides MR and holds outputs in current state during system margin testing; internally pulled up to BP |
| 7 | WDI | Watchdog input; requires high-to-low or low-to-high transition within timeout window; internally pulled down to GND via 10µA sink |
| 8 | I.C. | Internal connection - no external connection; leave unconnected |
| 9 | VCC | Internal power node - derived from highest IN1–IN4; bypass to GND with 1µF ceramic capacitor; not for external power sourcing |
| 10 | BP | Bypass voltage output (2.55V nominal); powers internal logic; bypass to GND with 1µF ceramic capacitor; not for external loads |
| 13 | IN4 | Fourth voltage detector input; monitors both UV (0.557V) and OV (0.643V) thresholds per Table 2; bypass to GND with 0.1µF capacitor |
| 14 | IN3 | Third voltage detector input; UV = 0.557V, OV = 0.643V; factory-set adjustable threshold; noise immunity enhanced by local 0.1µF bypass |
| 15 | IN2 | Second voltage detector input; UV = 1.670V, OV = 1.930V - configured for 1.8V rail monitoring per Selector Guide |
| 16 | IN1 | First voltage detector input; UV = 3.060V, OV = 3.540V - configured for 3.3V rail monitoring per Selector Guide |
Key Features
| Feature | Design Value |
|---|---|
| Quad voltage detection | Simultaneous monitoring of four independent supply rails (3.3V, 1.8V, Adj, Adj) with guaranteed UV/OV trip points |
| Dual-mode watchdog timer | 102.4s initial timeout enables safe µP boot sequence; auto-switches to 1.6s runtime supervision after first WDI toggle |
| 1% threshold accuracy | Ensures precise detection margins for critical supplies - eliminates false resets due to tolerance stack-up |
| Open-drain outputs with 4mA sink capability | Supports mixed-voltage system interfacing (e.g., 3.3V RESET driving 5V logic) using external pullup resistors |
| Self-powered architecture | Derives internal supply from monitored rails (IN1–IN4); no separate VCC required unless all inputs are adjustable |
Applications
| Server Power Sequencing | Telecom Line Card Monitoring |
|---|---|
|
Use Scenario: Coordinating startup/shutdown of multiple DC-DC converters powering CPU, memory, and I/O in 1U rack servers. IC Role / Device Role / Timing Role: Supervises 3.3V, 1.8V, and two adjustable rails; generates synchronized RESET pulse only after all supplies stabilize within spec. Use Value: Prevents latch-up or configuration errors caused by out-of-spec supply sequencing - eliminates field returns from premature logic activation. |
Use Scenario: Continuous monitoring of +12V, +3.3V, and backup battery rails in carrier-grade line cards operating 24/7. IC Role / Device Role / Timing Role: Detects overvoltage on primary 12V feed and undervoltage on 3.3V logic rail; asserts OV to trigger immediate shutdown before damage occurs. Use Value: Enables fail-safe response within 25µs of overvoltage event - protects FPGA, PHY, and transceiver ICs from ESD-like stress. |
| Storage System PSU Validation | Industrial Edge Controller Health Check |
|
Use Scenario: Verifying stable operation of redundant 5V/3.3V/1.8V supplies feeding NVMe SSD controllers and PCIe switch logic. IC Role / Device Role / Timing Role: Uses WDO-MR loop to autonomously cycle power if host firmware hangs; RESET timeout ensures full controller reinitialization. Use Value: Achieves >99.999% uptime by recovering hung subsystems without operator intervention or network management traffic. |
Use Scenario: Monitoring isolated 24V input, 5V system rail, and 3.3V microcontroller supply in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Configures IN1 for 24V (via resistor divider), IN2 for 5V, IN3/IN4 as adjustable for custom analog sensor rails. Use Value: Supports flexible rail coverage with single IC - reduces BOM count vs. discrete supervisor solutions while maintaining diagnostic granularity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6887HETE+ | Hex-input version with IN5/IN6 pins; identical threshold sets, timing, and package; higher pin count but same footprint | Required when monitoring six rails (e.g., multi-core SoC with auxiliary supplies); adds complexity without benefit for quad-rail systems | Select MAX6888HETE+ for cost-optimized 4-rail designs; choose MAX6887HETE+ only if sixth rail monitoring is confirmed necessary |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no overvoltage detection; no watchdog; SOT-23-6 package; lower quiescent current (8µA) | Limited to single-rail monitoring; lacks OV/WDO functionality; unsuitable for multivoltage or safety-critical watchdog use | Use only for simple 3.3V reset-only applications where space and current are critical; not a functional substitute for MAX6888HETE+ |
Compared with MAX6887HETE+, the MAX6888HETE+ reduces pin count and simplifies layout for 4-rail systems while retaining identical accuracy and watchdog behavior; versus TPS3808G33DBVR, it provides comprehensive multirail supervision with OV protection and autonomous recovery - essential for telecom and server reliability requirements.
Availability
MAX6888HETE+ is available at Aetrix Electronics and suitable for telecom infrastructure, enterprise storage systems, and industrial edge controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6888HETE+ 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 integrated multivoltage supervision with watchdog capability for high-reliability power management in servers, storage, and telecom equipment - targeting systems where supply fault detection and autonomous recovery are mandatory.
FAQ
What are the factory-set voltage thresholds for MAX6888HETE+?
The MAX6888HETE+ has factory-set thresholds per Table 2: IN1 UV = 3.060V / OV = 3.540V (for 3.3V rail), IN2 UV = 1.670V / OV = 1.930V (for 1.8V rail), and IN3/IN4 UV = 0.557V / OV = 0.643V (adjustable range). These values are guaranteed over –40°C to +85°C with ±1.5% accuracy.
Can MAX6888HETE+ monitor a 5V supply?
Yes - the MAX6888HETE+ can monitor a 5V supply by configuring IN1 as an adjustable input using an external resistor divider. Though its default IN1 threshold targets 3.3V, the "Adj" designation in the Selector Guide confirms IN3 and IN4 (and optionally IN1/IN2 via custom configuration) support user-defined thresholds above 0.6V.
How does the watchdog timer behave during power-up?
At power-up, the MAX6888HETE+ enters initial watchdog mode with 102.4s timeout. WDO goes high after 2.5ms power-up delay (tD-PO), then starts counting. This allows ample time for µP initialization before normal 1.6s supervision begins - a transition triggered automatically by the first valid WDI toggle.
Is an external pullup resistor required for RESET output?
Yes - RESET is an active-low open-drain output and requires an external pullup resistor to the target logic voltage (e.g., 3.3V or 5V). The MAX6888HETE+ datasheet specifies 4mA sink capability at 0.4V, so a typical 10kΩ pullup ensures robust logic-level translation without excessive current draw.
What is the role of the MARGIN pin on MAX6888HETE+?
The MARGIN pin on MAX6888HETE+ disables all output transitions (RESET, OV, WDO) when pulled low, holding them in their current state. This enables safe system-level margin testing - e.g., intentionally overdriving supplies - without triggering spurious resets or shutdowns while diagnostics run.
MAX6888HETE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 1.8V, 3.3V, Adj, 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)
MAX6888HETE+ FAQ
1.How can I place an order for MAX6888HETE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6888HETE+ 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 MAX6888HETE+ reliable?
The price and inventory of MAX6888HETE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6888HETE+ is usually 5 days.
3.What payment methods are accepted for MAX6888HETE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6888HETE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6888HETE+?
MAX6888HETE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6888HETE+ 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 MAX6888HETE+?
For technical support, including MAX6888HETE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6888HETE+ requirements.
6.How does Aetrix verify that MAX6888HETE+ is sourced from the original manufacturer or authorized distributors?
All MAX6888HETE+ 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 MAX6888HETE+ meets industry standards.
7.What is the process for return or replacement of MAX6888HETE+?
All MAX6888HETE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6888HETE+, 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 MAX6888HETE+ part is unused and in its original packaging.
Return procedure for MAX6888HETE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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