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Analog Devices Inc./Maxim Integrated MAX968EUA-T
- Part No.:
- MAX968EUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX968EUA-T.pdf
- Description:
- IC COMPARATOR 2 WINDW 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
MAX968EUA-T from Maxim Integrated is a dual micropower comparator with rail-to-rail inputs/outputs, programmable hysteresis, and an integrated 1.235V ±1.5% reference. It operates from +1.6V to +5.5V single supply, draws 10–16µA total supply current (5–8µA per comparator), and features open-drain outputs capable of sinking beyond VCC up to 6V. It is designed for window-comparator applications in ultra-low-voltage, battery-powered systems such as portable medical sensors and energy-harvesting nodes.
For engineers reviewing the MAX968EUA-T datasheet, MAX968EUA-T pinout, MAX968EUA-T application, or MAX968EUA-T equivalent, key selection considerations include its dual-window-comparator configuration, guaranteed hysteresis programming via HYST pin, µMAX-8 package footprint, -40°C to +85°C operating range, and compatibility with 2-cell alkaline or Li-ion battery supplies.
Technical Context
The MAX968EUA-T implements two independent comparators configured specifically as a window comparator - one monitoring upper threshold (INA+, INA−), the other lower threshold (INB+, INB−) - sharing a common HYST input and internal 1.235V reference. Its rail-to-rail input common-mode range (−0.25V to VCC − 0.25V) enables direct sensing across full supply rails, while open-drain outputs support flexible level translation via external pull-ups.
Hysteresis is programmable from ±1mV to ±50mV using a resistor divider between REF and HYST pins, with variation dependent on common-mode voltage. The device maintains functional operation down to 1.0V supply (though reference and specs are only guaranteed ≥1.6V), and exhibits 10µs propagation delay at 50mV overdrive with <6mV input offset voltage over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.6V to +5.5V - supports direct 2-cell alkaline (2.4–3.2V) or Li-ion (3.0–4.2V) battery operation without regulation |
| Supply Current (Total) | 10µA (typ) to 16µA (max) - enables >1-year battery life in low-duty-cycle sensor wake-up circuits |
| Reference Voltage | 1.235V ±1.5% (0°C to +85°C), ±2.5% (−40°C to +85°C) - provides stable trip-point generation without external precision reference |
| Propagation Delay | 10µs at 50mV overdrive - sufficient for slow-varying battery voltage monitoring and threshold alarms |
| Input Offset Voltage | ≤6.0mV (−40°C to +85°C, µMAX package) - ensures reliable detection of small voltage deviations in low-power analog front-ends |
| Common-Mode Input Range | −0.25V to VCC − 0.25V - allows direct connection to ground-referenced or rail-sensing inputs without level-shifting circuitry |
| Output Type | Open-drain - enables wired-OR logic, multi-supply level translation (e.g., 1.8V sense → 5V logic), and fault signaling with external pull-up |
Pinout & Package
MAX968EUA-T is housed in an 8-pin µMAX® package (U8-1), measuring 3.0mm × 3.0mm × 1.1mm with 0.65mm lead pitch. This space-saving, thermally enhanced package supports high-density PCB layouts in portable and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Open-drain output of Comparator A - sinks current when INA+ > INA−; requires external pull-up for logic-high assertion |
| 2 | VCC | Positive supply input - accepts +1.6V to +5.5V; powers both comparators and internal reference |
| 3 | INB+ | Noninverting input of Comparator B - used for lower-threshold detection in window-comparator mode |
| 4 | INB− | Inverting input of Comparator B - referenced against internal 1.235V or external divider for lower-bound trip point |
| 5 | INA− | Inverting input of Comparator A - referenced against internal 1.235V or external divider for upper-bound trip point |
| 6 | HYST | Hysteresis control input - sets symmetric hysteresis band (±1mV to ±50mV) for both comparators when connected to REF via resistor network |
| 7 | REF | Internal 1.235V reference output - sources up to 50µA; bypass with 0.1µF capacitor to reduce noise coupling into comparator inputs |
| 8 | GND | Analog ground reference - must be connected to system ground plane with low-impedance path to minimize noise and offset errors |
Key Features
| Feature | Design Value |
|---|---|
| Dual window-comparator architecture | Integrated upper- and lower-threshold detection in single 8-pin package - eliminates need for discrete dual-comparator + reference IC solution |
| Programmable hysteresis via HYST pin | Single resistor network configures identical hysteresis for both comparators - simplifies design of noise-immune battery undervoltage/overvoltage monitors |
| Rail-to-rail input common-mode range | Operates with inputs from −0.25V to VCC − 0.25V - enables direct sensing of battery voltage, supply rails, or ground-referenced signals without biasing resistors |
| Ultra-low quiescent current | 10–16µA total supply current - extends operational lifetime in coin-cell or energy-harvesting applications where duty cycling is critical |
| Open-drain outputs with 6V tolerance | Outputs safely sink to 6V above GND - supports level translation between sub-2V sensor domains and 3.3V/5V logic domains without external MOSFETs |
Applications
| Battery Voltage Window Monitor | Low-Power Supply Rail Supervisor |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage (2.5V–4.2V) to trigger charge enable/disable and prevent over-discharge. IC Role / Device Role / Timing Role: Dual comparator acts as precise window detector - OUTA asserts when voltage exceeds upper limit, OUTB asserts when below lower limit. Use Value: Eliminates external reference and hysteresis resistors; 10µA total current enables continuous monitoring during sleep mode without compromising battery life. |
Use Scenario: Validating stable 1.8V core supply in ultra-low-power microcontroller systems before boot sequence initiation. IC Role / Device Role / Timing Role: Configured as power-good monitor with hysteresis - asserts valid signal only when supply remains within 1.71V–1.89V for >100µs. Use Value: Internal 1.235V reference and HYST pin allow accurate, temperature-stable trip points without calibration; µMAX package fits tight space constraints near SoC. |
| Energy-Harvesting System Threshold Detector | Portable Medical Sensor Alert Circuit |
Use Scenario: Enabling data transmission only when harvested voltage (e.g., from piezoelectric or solar source) exceeds 2.2V and remains above 2.0V. IC Role / Device Role / Timing Role: Window comparator triggers enable signal to RF transceiver when input falls within defined energy-valid band. Use Value: 1.6V minimum supply allows operation directly from unregulated harvester output; open-drain outputs interface seamlessly with transceiver's enable pin requiring active-low logic. |
Use Scenario: Detecting out-of-range physiological signal (e.g., ECG amplitude > 3.5mV or < 0.2mV) in wearable patch monitors. IC Role / Device Role / Timing Role: Serves as analog alarm generator - drives LED or MCU interrupt when sensed signal breaches programmable upper/lower thresholds. Use Value: Rail-to-rail inputs accept AC-coupled sensor outputs without DC biasing; 6mV max offset ensures reliable detection of sub-millivolt-level anomalies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX967EUA-T | Dual comparator with shared hysteresis and reference, but configured as dual voltage monitor (not window); IN+ and IN− pins assigned per comparator, no dedicated window pinout | Suitable for independent high/low alerts (e.g., VCC OK + backup battery OK), not simultaneous window violation detection | Select MAX967EUA-T when separate threshold monitoring is required; MAX968EUA-T is mandatory for true window-comparator topology. |
| TLV3702IDR | Low-power dual comparator (1.8µA/comparator) with rail-to-rail inputs, no internal reference or hysteresis pin; requires external reference and feedback resistors for window function | Higher BOM count and layout area needed to replicate MAX968EUA-T's integrated window functionality | Choose TLV3702IDR only if supply >2.7V and external reference/hysteresis design flexibility is preferred over integration and ultra-low-voltage operation. |
Compared with MAX967EUA-T and TLV3702IDR, the MAX968EUA-T uniquely integrates window-comparator topology, programmable hysteresis, and precision reference in an 8-pin µMAX package - reducing component count, PCB area, and enabling operation down to 1.6V supply without external support circuitry.
Availability
MAX968EUA-T is available at Aetrix Electronics and suitable for battery voltage monitoring, portable medical alerting, and energy-harvesting threshold detection requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MAX968EUA-T 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, medical, communications, and consumer applications.
The MAX965–MAX970 family delivers micropower, ultra-low-voltage comparators with integrated references for battery-constrained systems - the MAX968EUA-T specifically targets compact window-comparator implementations in portable and wearable electronics.
FAQ
What is the operating temperature range for the MAX968EUA-T?
The MAX968EUA-T is specified for operation from −40°C to +85°C ambient temperature. All electrical characteristics - including reference accuracy (±2.5%), input offset voltage (≤6.0mV), and supply current (10–16µA) - are guaranteed across this extended industrial temperature range, making it suitable for outdoor, automotive cabin, and medical-grade portable equipment.
Does the MAX968EUA-T require external components to function as a window comparator?
The MAX968EUA-T requires only two external resistors (R1 between REF and HYST, R2 between HYST and GND) to program hysteresis; no external reference or additional comparators are needed. Its pinout and internal routing are optimized for window detection - INA− and INB+ serve as dedicated upper/lower threshold inputs, and both comparators share the same HYST and REF pins, enabling fully integrated window functionality with minimal external parts.
Can the MAX968EUA-T operate from a 1.5V supply?
The MAX968EUA-T is guaranteed to operate down to +1.6V supply; operation at 1.5V is not specified and may result in degraded performance - including reduced output sink capability, increased propagation delay, and loss of reference regulation. While the comparators may remain functional down to ~1.0V, the 1.235V reference does not regulate below 1.5V, so accurate window thresholds cannot be maintained at 1.5V.
What is the maximum sink current capability of the MAX968EUA-T outputs?
Each open-drain output of the MAX968EUA-T can sink up to 10mA continuously (tested at VCC = 5V, TA = +25°C), with short-circuit current decreasing at lower supply voltages. At VCC = 2V, typical short-circuit sink current is ~4mA. Output low voltage remains ≤0.4V at 500µA load for VCC > 2.7V, ensuring clean logic-level transitions into standard CMOS inputs.
How is hysteresis programmed on the MAX968EUA-T, and what is its range?
Hysteresis on the MAX968EUA-T is programmed by connecting resistors R1 (REF to HYST) and R2 (HYST to GND). The resulting hysteresis band (VHB) approximates 2 × (VREF − VHYST) and ranges from ±1mV to ±50mV. For example, with R2 = 2.4MΩ and R1 = 1MΩ, VHB ≈ 20mV. The HYST pin voltage must stay within VREF − 50mV to VREF, and hysteresis applies identically to both comparators.
MAX968EUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Window
- Number of Elements:
- 2
- Output Type:
- Open-Drain, Push-Pull
- Voltage - Supply, Single/Dual (±):
- 1.6V ~ 5.5V
- :
- 15mV @ 5.5V
- Voltage - Input Offset (Max):
- 0.005µA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 16µA
- Current - Quiescent (Max):
- 56.48dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 20µs
- Propagation Delay (Max):
- ±1mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX968EUA-T FAQ
1.How can I place an order for MAX968EUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX968EUA-T 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 MAX968EUA-T reliable?
The price and inventory of MAX968EUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX968EUA-T is usually 5 days.
3.What payment methods are accepted for MAX968EUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX968EUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX968EUA-T?
MAX968EUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX968EUA-T 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 MAX968EUA-T?
For technical support, including MAX968EUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX968EUA-T requirements.
6.How does Aetrix verify that MAX968EUA-T is sourced from the original manufacturer or authorized distributors?
All MAX968EUA-T 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 MAX968EUA-T meets industry standards.
7.What is the process for return or replacement of MAX968EUA-T?
All MAX968EUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX968EUA-T, 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 MAX968EUA-T part is unused and in its original packaging.
Return procedure for MAX968EUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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