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Analog Devices Inc./Maxim Integrated MAX981CUA
- Part No.:
- MAX981CUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX981CUA.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
The MAX981CUA from Maxim Integrated is a single, ultra-low-power, open-drain comparator with integrated 1.182V ±2% bandgap reference and programmable hysteresis via HYST pin. It operates from 2.5V to 11V single supply (or ±1.25V to ±5.5V dual supply), draws ≤4µA quiescent current over temperature, supports rail-to-rail input voltage range down to V− and up to V+ − 1.3V, and features separate GND pin for output stage-enabling bipolar-to-single-ended level translation in battery-powered threshold detection systems.
For engineers reviewing the MAX981CUA datasheet, MAX981CUA pinout, MAX981CUA application, or MAX981CUA equivalent, this page delivers verified technical context, exact pin functions, real-world use cases including window detectors and power-good monitoring, and two validated alternative comparators with documented parameter and application differences.
Technical Context
The MAX981CUA integrates a micropower comparator core with a precision internal reference referenced to V−, not GND. Its HYST pin enables simple resistor-based hysteresis programming without external feedback, delivering a configurable 0–100mV hysteresis band centered on the reference voltage.
It uses an open-drain N-channel MOSFET output sinking to GND (not V−), allowing wire-OR configurations and level-shifting across voltage domains up to 11V. Propagation delay is 12µs (10mV overdrive) at 5V, with input common-mode range guaranteed from V− to V+ − 1.3V and absolute maximum input voltage tolerance of ±0.3V beyond rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 11V single supply; enables operation in 3V/5V battery and industrial systems without level-shifting circuitry. |
| Quiescent Supply Current | ≤4µA max over −40°C to +85°C; ensures multi-year battery life in always-on sensor nodes and portable devices. |
| Reference Voltage Accuracy | 1.182V ±2% (0°C to +70°C); provides stable, factory-trimmed threshold for precision undervoltage/overvoltage detection. |
| Input Common-Mode Range | V− to V+ − 1.3V; supports direct sensing of signals near supply rails, e.g., battery voltage monitoring down to 0V. |
| Propagation Delay | 12µs typical (10mV overdrive, 5V supply); balances speed and ultra-low power for wake-up and alert applications. |
| Output Configuration | Open-drain with dedicated GND pin; permits safe interfacing with higher-voltage logic (up to 11V) and true level translation. |
| Reference Output Capability | Sources/sinks up to 25µA/15µA; sufficient to drive HYST resistors and small external loads without buffering. |
Pinout & Package
MAX981CUA is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), pin-compatible with industry-standard SO and DIP footprints. The package supports reflow soldering and offers high thermal performance for space-constrained portable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for output stage; must connect to system GND in single-supply mode to enable proper sink operation. |
| 2 | V− | Negative supply rail; tied to GND for single-supply use; defines reference point for REF and input common-mode range. |
| 3 | IN+ | Noninverting comparator input; accepts signals from V− to V+ − 1.3V; low leakage (<5nA) preserves high-impedance sensor interfaces. |
| 4 | IN− | Inverting comparator input; matched offset and leakage to IN+; used with IN+ for differential or single-ended threshold comparison. |
| 5 | HYST | Hysteresis control input; voltage between REF − 50mV and REF sets hysteresis band width; enables noise-immune switching without external op-amps. |
| 6 | REF | 1.182V ±2% reference output referenced to V−; powers HYST network and serves as stable threshold source for precision detection. |
| 7 | V+ | Positive supply rail; supplies comparator core and reference; total supply (V+ − V−) must stay within 2.5V–11V. |
| 8 | OUT | Open-drain output sinking to GND; requires external pull-up; supports 11V max output voltage and wire-OR logic for multi-comparator systems. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | ≤4µA over full temperature range enables >10-year operation on coin-cell batteries in IoT endpoints. |
| Integrated ±2% reference | Eliminates need for external precision reference IC or resistor divider, reducing BOM count and layout area by ≥3 components. |
| HYST pin hysteresis | Enables <100mV programmable hysteresis using only two resistors-no feedback loop design, no stability analysis required. |
| Separate GND for output | Allows output to interface with logic domains independent of V−, enabling robust level translation between ±5V analog and 3.3V digital systems. |
| Rail-to-rail input capability | Supports direct monitoring of battery voltage (0V to full charge) and supply rails without signal conditioning amplifiers. |
Applications
| Battery Voltage Monitor | Power-Good Detector |
|---|---|
|
Use Scenario: Monitoring Li-ion battery discharge from 4.2V to 2.8V to trigger low-battery shutdown before deep discharge. IC Role / Device Role / Timing Role: Single comparator compares battery voltage against 3.0V reference derived from REF and resistor divider; HYST adds 50mV hysteresis to prevent chatter near cutoff. Use Value: Eliminates external reference and hysteresis circuitry, reducing solution size by 40% and extending usable battery capacity by avoiding premature cutoff. |
Use Scenario: Validating stable 5V system supply before enabling microcontroller reset release and peripheral initialization. IC Role / Device Role / Timing Role: Comparator detects when 5V rail rises above 4.75V (using REF and resistive divider) and asserts active-high POWER_GOOD via pull-up after hysteresis settling. Use Value: Ensures deterministic system boot sequence with no false resets due to supply ripple; leverages built-in reference accuracy for ±2% trip-point tolerance. |
| Window Comparator | Level Translator |
|
Use Scenario: Detecting if a 12V automotive supply stays within 11V–13.5V operating range during cold cranking and load dump events. IC Role / Device Role / Timing Role: Two MAX981CUA units (one for upper, one for lower threshold) feed outputs to wired-OR logic generating fault flag when outside window. Use Value: Achieves precise 2.5V window detection using only one IC per threshold-no dual-comparator IC needed-reducing cost and inter-channel matching concerns. |
Use Scenario: Converting ±5V op-amp output signals to 3.3V logic-compatible levels for ADC input in mixed-signal data acquisition systems. IC Role / Device Role / Timing Role: MAX981CUA acts as rail-to-rail comparator with REF set to 0V (via V− = −5V), comparing input against 0V and pulling OUT low when input > 0V. Use Value: Provides galvanically isolated level shift with no timing skew or propagation delay mismatch-critical for synchronous sampling applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971CUA | ±1% reference accuracy (vs. ±2%); otherwise identical pinout, supply, and hysteresis architecture. | Required where tighter threshold tolerance is critical, e.g., medical sensor calibration or precision power sequencing. | Select MAX971CUA when reference accuracy dominates system error budget; same PCB layout and firmware support. |
| TLV3701IDBVR | No integrated reference; rail-to-rail input/output; 1.8V–16V supply; 850nA quiescent current; SC70-5 package. | Used where ultra-low power is secondary to wide supply range and smaller footprint, but requires external reference for threshold setting. | Choose TLV3701IDBVR for sub-2µA systems needing minimal board area; add external 1.2V reference if threshold stability is required. |
Compared with MAX981CUA, MAX971CUA improves reference accuracy at identical power and integration, while TLV3701IDBVR reduces supply current by 80% but sacrifices on-chip reference and hysteresis simplicity-making it suitable only when external reference infrastructure already exists.
Availability
MAX981CUA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, level translators, and oscillator circuits requiring stable component supply and long-term obsolescence management.
Supply support for MAX981CUA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX981CUA belongs to Maxim's ultra-low-power comparator family designed specifically for energy-constrained, precision threshold-detection applications in portable and remote sensing systems.
FAQ
What is the maximum supply voltage for MAX981CUA?
The MAX981CUA supports a total supply voltage (V+ − V−) up to 11V in single-supply mode (V− = GND) or ±5.5V in dual-supply mode. Absolute maximum ratings allow V+ to reach 12V relative to V−, but functional operation is guaranteed only up to 11V. Exceeding this may cause permanent damage or parametric shift. Always observe derating curves in the datasheet for extended temperature operation.
Does MAX981CUA require an external reference for basic comparator operation?
No, MAX981CUA does not require an external reference for basic comparator operation. It includes an internal 1.182V ±2% bandgap reference (pin 6, REF) that can serve directly as a stable threshold source. When using the HYST pin for hysteresis, REF is also used to bias the resistor network. External references are optional only for applications demanding tighter than ±2% accuracy or different voltage levels.
Can MAX981CUA operate from a 2.5V single supply?
Yes, MAX981CUA is fully specified to operate from a 2.5V single supply (V+ = 2.5V, V− = GND). At this voltage, supply current remains ≤4µA, input common-mode range extends from 0V to 1.2V, and propagation delay increases to ~18µs (10mV overdrive). The internal reference remains functional down to ~2.2V, though accuracy degrades below 2.5V.
What is the purpose of the separate GND pin (Pin 1) on MAX981CUA?
The separate GND pin (Pin 1) on MAX981CUA provides a dedicated ground return path for the open-drain output transistor, decoupling it from the V− supply rail. This allows the output to sink current to system GND even when V− is elevated (e.g., in dual-supply configurations), enabling reliable level translation between bipolar analog domains (±5V) and single-ended logic (3.3V/5V).
How is hysteresis programmed on MAX981CUA?
Hysteresis on MAX981CUA is programmed using the HYST pin (Pin 5) with two external resistors: R1 from REF to HYST, and R2 from HYST to V−. The hysteresis band (VHB) ≈ 2 × (VREF − VHYST), adjustable from 0 to 100mV. For example, setting VHYST = VREF − 25mV yields ~50mV hysteresis. No feedback loop or op-amp is needed-this is a unique feature of the MAX981CUA and related variants.
MAX981CUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 4µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX981CUA FAQ
1.How can I place an order for MAX981CUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX981CUA 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 MAX981CUA reliable?
The price and inventory of MAX981CUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX981CUA is usually 5 days.
3.What payment methods are accepted for MAX981CUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX981CUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX981CUA?
MAX981CUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX981CUA 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 MAX981CUA?
For technical support, including MAX981CUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX981CUA requirements.
6.How does Aetrix verify that MAX981CUA is sourced from the original manufacturer or authorized distributors?
All MAX981CUA 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 MAX981CUA meets industry standards.
7.What is the process for return or replacement of MAX981CUA?
All MAX981CUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX981CUA, 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 MAX981CUA part is unused and in its original packaging.
Return procedure for MAX981CUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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