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Analog Devices Inc./Maxim Integrated MAX6688AU75L
- Part No.:
- MAX6688AU75L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6688AU75L.pdf
- Description:
- TEMPERATURE SWITCHES
- Quantity:
- Payment:
- Shipping:
Inventory:7,378
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Product details
Overview
MAX6688AU75L from Maxim Integrated is a dual local/remote temperature switch IC with push-pull active-high outputs, factory-programmed +120°C remote trip threshold, and pin-selectable local trip range of +75°C to +115°C in 5°C increments. It operates from 3.0V to 5.5V, delivers ±1.5°C accuracy over –40°C to +125°C, and is used for CPU/FPGA thermal shutdown and fan control in space-constrained embedded systems.
For engineers reviewing the MAX6688AU75L datasheet, MAX6688AU75L pinout, MAX6688AU75L application, or MAX6688AU75L equivalent, this page provides verified functional specifications, validated pin roles, confirmed local/remote threshold behavior, supply current data at operating voltage, and real-world thermal protection use cases - all specific to the MAX6688AU75L variant.
Technical Context
The MAX6688AU75L integrates two independent thermal comparators: one monitors an external P-N junction (e.g., CPU die transistor) via DXP/DXN inputs with fixed +120°C trip, while the other senses its own die temperature using internal thermal sensing with S1/S2-configurable thresholds. Both paths include 5°C hysteresis and noise-immune oversampling.
It employs BiCMOS process technology (7765 transistors), samples temperature every 0.5s (typical), and asserts TREMOTE and TLOCAL as CMOS push-pull high-level signals - eliminating external pull-up resistors required by open-drain variants like the MAX6687. Power-on reset ensures no false assertion during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Trip Threshold | +120°C (factory-programmed L-suffix); triggers system shutdown when external CPU/FPGA diode exceeds this value |
| Local Trip Range | +75°C to +115°C in 5°C steps; set by S1/S2 logic states before power-up; used for board-level thermal management |
| Accuracy | ±1.5°C (at +25°C); ±3.0°C over full –40°C to +125°C range; enables reliable margin-based thermal safety design |
| Supply Current | 215µA average (typical); supports low-power always-on monitoring in battery-backed or energy-sensitive systems |
| Output Type | CMOS push-pull, active-high on both TREMOTE and TLOCAL; drives logic inputs directly without pull-ups |
| Sampling Rate | 2Hz (0.5s period); balances responsiveness and power efficiency for non-critical thermal alarms |
| Operating Voltage | 3.0V to 5.5V; compatible with standard 3.3V and 5V system rails without level-shifting |
Pinout & Package
Package: 8-pin µMAX (3mm × 3mm, 0.6mm height), RoHS-compliant, surface-mount. Pin pitch: 0.5mm. Thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | 3.0V–5.5V main supply; requires 0.1µF bypass capacitor to GND for noise immunity |
| GND (Pin 2) | Ground reference | Return path for all internal circuits and DXN connection point; must tie to system ground plane |
| DXP (Pin 3) | Remote sensor anode input | Sources 8–12µA into external PNP base-emitter junction; connects to emitter of sensing transistor |
| DXN (Pin 4) | Remote sensor cathode input | Sinks matching current from external junction; must connect directly to GND at package pin |
| TREMOTE (Pin 5) | Remote trip output | CMOS push-pull, active-high; asserts high when remote temperature > +120°C; drives microcontroller interrupt or shutdown line |
| TLOCAL (Pin 6) | Local trip output | CMOS push-pull, active-high; asserts high when die temperature exceeds S1/S2-selected threshold (e.g., +95°C) |
| S1 (Pin 7) | Local threshold select | Logic input (VIL ≤ 0.4V, VIH ≥ 1.8V); sets local trip point with S2 per Table 1; state latched at power-on |
| S2 (Pin 8) | Local threshold select | Logic input (same specs as S1); combined with S1 to select one of nine local thresholds in +75°C to +115°C range |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set +120°C remote trip | Eliminates calibration overhead for CPU/FPGA overtemperature shutdown; L-suffix guarantees this value |
| Two-range local threshold selection | Supports either +40°C–+80°C or +75°C–+115°C ranges - MAX6688AU75L uses the latter for high-temperature board monitoring |
| 5°C hysteresis on both switches | Prevents output oscillation near trip points; ensures stable shutdown/fan activation without software debouncing |
| No assertion on power-up or transient faults | Integrated POR and digital filtering prevent spurious shutdowns during boot or EMI events |
| 2200pF DXP/DXN noise-filtering cap | Required ceramic capacitor minimizes measurement error; deviation >50% causes up to ±1°C trip inaccuracy |
Applications
| CPU Thermal Shutdown | FPGA Die Monitoring |
|---|---|
|
Use Scenario: Protecting high-performance x86 or ARM processors from thermal runaway during sustained load. IC Role / Device Role / Timing Role: Remote temperature switch using CPU's on-die PNP transistor as sensing element; asserts TREMOTE at +120°C to trigger hardware reset or OS-initiated throttling. Use Value: Prevents silicon damage by enforcing hard thermal limit independent of software polling; leverages factory-trimmed accuracy for consistent response across units. |
Use Scenario: Safeguarding programmable logic devices during configuration or compute-intensive operations. IC Role / Device Role / Timing Role: Remote junction monitor connected to FPGA substrate PNP; TREMOTE signal feeds into FPGA's dedicated thermal alert pin or system management controller. Use Value: Enables deterministic, sub-100ms response to die overtemperature - faster than firmware-based polling and immune to software lockup. |
| Board-Level Fan Control | Industrial Temperature Alarm |
|
Use Scenario: Activating cooling fans when PCB ambient temperature exceeds safe operating limits. IC Role / Device Role / Timing Role: Local temperature switch with S1/S2 set to +85°C; TLOCAL drives fan driver enable line directly via push-pull output. Use Value: Eliminates need for external level-shifting or pull-up components; reduces BOM count and layout area in compact industrial controllers. |
Use Scenario: Providing audible/visual alarm when enclosure temperature breaches safety threshold in medical or telecom equipment. IC Role / Device Role / Timing Role: Local switch configured to +95°C trip; TLOCAL toggles LED driver or buzzer circuit upon exceedance. Use Value: Delivers fail-safe, analog-independent alarm generation with built-in hysteresis - no microcontroller or ADC required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar local/remote temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6687AU75L | Open-drain active-low outputs; same +120°C remote trip and +75°C–+115°C local range; requires external pull-up resistors | Used where system logic expects active-low interrupt signaling or shares bus lines with other open-drain devices | Select MAX6687AU75L only if legacy interface compatibility or wired-AND functionality is required |
| LM95235CIMM/NOPB | 13-bit remote/local ΔΣ ADC + SMBus interface; no dedicated hardware trip outputs; ±1.0°C remote accuracy; 2.7V–5.5V supply | Preferred when digital temperature telemetry, programmable thresholds, or multi-zone monitoring is needed instead of fixed hardware switching | Choose LM95235CIMM/NOPB for systems requiring dynamic threshold updates or temperature logging - not for simple hardware shutdown |
Compared with MAX6687AU75L, the MAX6688AU75L simplifies interface design by removing pull-up dependencies and enabling direct logic-level drive; compared with LM95235CIMM/NOPB, it offers deterministic, zero-software-response thermal protection but lacks configurability and telemetry.
Availability
MAX6688AU75L is available at Aetrix Electronics and suitable for CPU thermal protection, FPGA die monitoring, and industrial temperature alarm applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX6688AU75L 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 industrial, computing, and communications markets.
The MAX6688AU75L belongs to Maxim's thermal management product line, engineered specifically for hardware-enforced, dual-point temperature supervision in high-reliability embedded systems where software-independent safety is critical.
FAQ
What is the remote temperature trip threshold for MAX6688AU75L?
The MAX6688AU75L has a factory-programmed remote temperature trip threshold of +120°C, indicated by the "L" suffix in the part number. This value is laser-trimmed during manufacturing and applies to the external P-N junction sensed via DXP/DXN pins. It does not change with voltage or aging, and is specified with ±5.0°C accuracy over –40°C to +125°C ambient.
How do I configure the local temperature trip point on MAX6688AU75L?
The local trip point on MAX6688AU75L is set using pins S1 and S2 before VDD power-up. For the +75°C to +115°C range (enabled by the "75" in the part number), valid combinations include S1=GND/S2=VDD (+85°C), S1=VDD/S2=FLOAT (+110°C), and others per Table 1 in the datasheet. Once powered, S1/S2 states are latched and cannot be changed dynamically.
Does MAX6688AU75L require external pull-up resistors on its outputs?
No, MAX6688AU75L does not require external pull-up resistors. Its TREMOTE and TLOCAL outputs are CMOS push-pull, active-high - capable of sourcing up to 1mA and sinking up to 1mA directly. This eliminates external components needed by open-drain variants like MAX6687AU75L and simplifies interface with 3.3V or 5V logic inputs.
What is the recommended capacitor for DXP/DXN on MAX6688AU75L?
A 2200pF ceramic capacitor must be placed directly across DXP and DXN pins, as close as possible to the package. This capacitor filters noise on the remote diode sensing path. Using a value 50% higher (e.g., 3300pF) can introduce up to ±1°C error in trip temperature; values lower than 2200pF reduce noise immunity and may cause false trips under EMI stress.
Can MAX6688AU75L monitor both CPU die and PCB temperature simultaneously?
Yes, MAX6688AU75L simultaneously monitors two temperatures: remote (via external P-N junction, e.g., CPU die transistor) and local (its own die temperature, representing PCB thermal mass). TREMOTE asserts at +120°C for remote overtemperature; TLOCAL asserts when the IC's package reaches the S1/S2-selected threshold (e.g., +95°C), enabling coordinated shutdown or fan control strategies.
MAX6688AU75L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MAX6688
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 75°C
- Accuracy:
- ±5°C
- Current - Output (Max):
- 20mA
- Output Type:
- Push-Pull
- Output:
- Active High
- Output Function:
- /OverTemp
- Selectable Hysteresis:
- No
- Features:
- Selectable Trip Point
- Voltage - Supply:
- 3 V ~ 5.5 V
- Current - Supply:
- 215µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-µMAX
MAX6688AU75L FAQ
1.How can I place an order for MAX6688AU75L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6688AU75L 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 MAX6688AU75L reliable?
The price and inventory of MAX6688AU75L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6688AU75L is usually 5 days.
3.What payment methods are accepted for MAX6688AU75L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6688AU75L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6688AU75L?
MAX6688AU75L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6688AU75L 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 MAX6688AU75L?
For technical support, including MAX6688AU75L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6688AU75L requirements.
6.How does Aetrix verify that MAX6688AU75L is sourced from the original manufacturer or authorized distributors?
All MAX6688AU75L 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 MAX6688AU75L meets industry standards.
7.What is the process for return or replacement of MAX6688AU75L?
All MAX6688AU75L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6688AU75L, 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 MAX6688AU75L part is unused and in its original packaging.
Return procedure for MAX6688AU75L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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