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Analog Devices Inc./Maxim Integrated MAX991EUA+T
- Part No.:
- MAX991EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX991EUA+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:7,430
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Product details
Overview
MAX991EUA+T from Maxim Integrated is a dual, micropower, rail-to-rail input/output comparator with push-pull outputs, operating from +2.5V to +5.5V single supply or ±1.25V to ±2.75V dual supplies. It delivers 120ns propagation delay, 48μA per comparator quiescent current, and ±0.5mV typical input offset voltage. It is used in battery-powered zero-crossing detectors and portable threshold sensing circuits.
For engineers reviewing the MAX991EUA+T datasheet, MAX991EUA+T pinout, MAX991EUA+T application, or MAX991EUA+T equivalent, key selection criteria include its dual-channel push-pull output architecture, rail-to-rail I/O capability across 2.5–5.5V operation, internal 2.5mV hysteresis, and μMAX-8 package compatibility with space-constrained industrial and portable designs.
Technical Context
The MAX991EUA+T implements two independent high-speed comparators sharing a common supply domain, each featuring rail-to-rail inputs extending 250mV beyond VEE and VCC, and push-pull outputs capable of sourcing/sinking up to 8mA while maintaining rail-to-rail swing. Its input bias current is typically 1.0pA, enabling high-impedance signal conditioning without loading.
Propagation delay is specified at 120ns (100mV overdrive, CL = 15pF, VCC = 5V), with minimal variation across temperature (−40°C to +85°C) and supply voltage (2.5V–5.5V). The unique output stage suppresses supply-current surges during switching, eliminating supply glitches and reducing need for local decoupling capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V single supply; enables direct use in 3V and 5V systems without level shifting |
| Quiescent Current | 48μA per comparator at VCC = 2.7V; supports multi-year battery life in always-on sensor nodes |
| Propagation Delay | 120ns at 100mV overdrive; sufficient for >1MHz signal edge detection in timing-critical applications |
| Input Offset Voltage | ±0.5mV typical; ensures accurate threshold discrimination down to sub-millivolt levels |
| Input Common-Mode Range | VEE − 0.25V to VCC + 0.25V; allows direct interfacing to signals exceeding supply rails by 250mV |
| Output Drive Capability | Sources/sinks 8mA with rail-to-rail swing; drives LEDs, logic inputs, or small MOSFET gates directly |
| Internal Hysteresis | ±2.5mV; prevents chatter on slow-moving or noisy inputs without external components |
Pinout & Package
The MAX991EUA+T is housed in an 8-pin μMAX® package (U8-1), measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTA | Comparator A Output | Push-pull active-high/active-low output; no external pullup required; compatible with CMOS/TTL loads |
| 2 - INA− | Comparator A Inverting Input | Differential input node with 1.0pA typical bias current; supports high-impedance voltage monitoring |
| 3 - INA+ | Comparator A Noninverting Input | Differential input node with rail-to-rail common-mode range; accepts signals from −0.25V to VCC + 0.25V |
| 4 - VEE | Negative Supply Voltage | Ground reference for single-supply operation; may be connected to 0V or negative rail in dual-supply mode |
| 5 - VCC | Positive Supply Voltage | Primary power input; supports 2.5V–5.5V range; requires local 0.1μF ceramic decoupling |
| 6 - INB+ | Comparator B Noninverting Input | Second independent input channel; identical electrical characteristics to INA+ |
| 7 - INB− | Comparator B Inverting Input | Second independent input channel; matched offset and bias performance with INA− |
| 8 - OUTB | Comparator B Output | Independent push-pull output; electrically isolated from OUTA; supports concurrent dual-threshold decisions |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O operation | Enables full dynamic range utilization in low-voltage systems (2.5V–5.5V), maximizing SNR in precision sensing |
| 120ns propagation delay at 48μA | Delivers high-speed response without sacrificing micropower efficiency-critical for wake-up comparators |
| Internal 2.5mV hysteresis | Eliminates need for external positive feedback resistors in noise-prone environments like motor control feedback |
| Push-pull output stage | Drives both logic-high and logic-low states actively; removes dependency on external pullup networks and saves board space |
| No phase reversal on overdriven inputs | Guarantees predictable output polarity even when inputs exceed rails by 250mV-essential for robust fault detection |
Applications
| Zero-Crossing Detection | Threshold Monitoring |
|---|---|
|
Use Scenario: Detecting AC waveform polarity transitions in battery-powered energy meters or audio signal processors. IC Role / Device Role / Timing Role: Dual comparator configured as precision zero-cross detector with hysteresis to reject line noise. Use Value: 120ns delay ensures sub-microsecond timing accuracy; rail-to-rail inputs accept ±100mV signals directly referenced to ground. |
Use Scenario: Monitoring battery voltage against multiple thresholds (e.g., warn-at-3.3V, shutdown-at-2.8V) in portable medical devices. IC Role / Device Role / Timing Role: Two independent comparators provide simultaneous high/low threshold evaluation without microcontroller polling. Use Value: 48μA total quiescent current extends runtime; ±0.5mV offset enables tight 50mV window detection. |
| Level Translation | Window Comparator |
|
Use Scenario: Converting 5V logic edges to 3.3V-compatible signals in mixed-voltage FPGA I/O interfaces. IC Role / Device Role / Timing Role: One comparator acts as a fast, low-power level shifter using VCC = 5V and reference tied to 3.3V. Use Value: Push-pull output swings rail-to-rail, ensuring clean 0–3.3V transitions; no external pullup reduces component count. |
Use Scenario: Validating sensor output stays within safe operational bounds (e.g., temperature sensor between 10°C and 40°C). IC Role / Device Role / Timing Role: Dual comparator forms upper/lower limit detector with shared reference and independent hysteresis. Use Value: Internal 2.5mV hysteresis prevents oscillation near trip points; rail-to-rail inputs accommodate wide reference ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Higher 1.2mA supply current; open-drain outputs require pullups; 1.5μs propagation delay; no rail-to-rail inputs | Less suitable for battery-powered or high-speed edge detection; better for legacy 5V-only designs with existing pullup infrastructure | Select LM393DR only when cost is primary constraint and speed/power are secondary; verify input common-mode compliance |
| TLV3702IDR | Lower 800nA quiescent current but slower 2.5μs delay; rail-to-rail inputs/outputs; same 2.5V–5.5V supply range | Better for ultra-low-power wake-up circuits where microsecond latency is acceptable; not ideal for >100kHz signal monitoring | Choose TLV3702IDR for multi-year coin-cell applications; avoid when 120ns timing or 8mA drive is required |
Compared with LM393DR and TLV3702IDR, the MAX991EUA+T uniquely balances nanosecond-speed response, micropower consumption, rail-to-rail I/O, and push-pull drive-making it optimal for compact, high-fidelity analog front-ends in portable instrumentation and real-time control.
Availability
MAX991EUA+T is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered test equipment, and industrial sensor interface modules requiring stable component supply and long-term manufacturability.
Supply support for MAX991EUA+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) is a semiconductor design and manufacturing company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX991EUA+T belongs to Maxim's high-speed micropower comparator family, engineered for precision signal conditioning in space- and power-constrained systems where speed, accuracy, and supply flexibility are co-critical.
FAQ
What is the operating temperature range for the MAX991EUA+T?
The MAX991EUA+T is fully specified over the industrial temperature range of −40°C to +85°C. All electrical parameters-including propagation delay, input offset voltage, and supply current-are guaranteed across this range. The μMAX package's thermal performance supports reliable operation in enclosed enclosures without forced airflow.
Does the MAX991EUA+T support dual-supply operation?
Yes, the MAX991EUA+T supports dual-supply operation from ±1.25V to ±2.75V. When used in dual-supply mode, VEE is connected to the negative rail and VCC to the positive rail. Input common-mode range extends 250mV beyond both rails, allowing bipolar signal handling without level shifting.
Can the MAX991EUA+T drive an LED directly?
Yes, the MAX991EUA+T can drive a standard indicator LED directly. Its push-pull output sources/sinks up to 8mA with rail-to-rail swing. For a typical 2V, 5mA LED, connect the anode to VCC and cathode to OUTA or OUTB through a current-limiting resistor (~200Ω at 5V), enabling active-low LED control without external transistors.
Is there internal hysteresis in the MAX991EUA+T, and can it be adjusted?
The MAX991EUA+T includes fixed internal hysteresis of ±2.5mV, which improves noise immunity for slow-moving inputs. This hysteresis cannot be disabled or trimmed, but additional hysteresis can be added externally using three resistors in a positive-feedback configuration, as detailed in Maxim's application note for the MAX991EUA+T.
What is the maximum capacitive load the MAX991EUA+T output can drive while maintaining 120ns propagation delay?
The 120ns propagation delay specification for the MAX991EUA+T is guaranteed with a 15pF capacitive load at VCC = 5V and 100mV input overdrive. Delay increases to ~200ns at 200pF. For loads >50pF, consider adding a series resistor near the output to isolate capacitance and preserve timing integrity.
MAX991EUA+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:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 5.5V, ±1.25V ~ 2.75V
- :
- 5mV @ 5.5V
- Voltage - Input Offset (Max):
- 1pA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 96µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 210ns
- Propagation Delay (Max):
- ±2.5mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX991EUA+T FAQ
1.How can I place an order for MAX991EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX991EUA+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 MAX991EUA+T reliable?
The price and inventory of MAX991EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX991EUA+T is usually 5 days.
3.What payment methods are accepted for MAX991EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX991EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX991EUA+T?
MAX991EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX991EUA+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 MAX991EUA+T?
For technical support, including MAX991EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX991EUA+T requirements.
6.How does Aetrix verify that MAX991EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX991EUA+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 MAX991EUA+T meets industry standards.
7.What is the process for return or replacement of MAX991EUA+T?
All MAX991EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX991EUA+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 MAX991EUA+T part is unused and in its original packaging.
Return procedure for MAX991EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX991EUA+T Tags
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