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Analog Devices Inc./Maxim Integrated MAX991EUA-TG074
- Part No.:
- MAX991EUA-TG074
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX991EUA-TG074.pdf
- Description:
- MAX991 R-R I/O COMPARATOR
- Quantity:
- Payment:
- Shipping:
Inventory:850
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Product details
Overview
MAX991EUA-TG074 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, delivering 120ns propagation delay and 48µA per comparator quiescent current - ideal for battery-powered zero-crossing detection and threshold monitoring in portable instrumentation.
For engineers reviewing the MAX991EUA-TG074 datasheet, MAX991EUA-TG074 pinout, MAX991EUA-TG074 application, or MAX991EUA-TG074 equivalent, key selection criteria include verified rail-to-rail input common-mode range (–0.25V to VCC + 0.25V), guaranteed 8mA output drive capability, internal 2.5mV hysteresis, and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX991EUA-TG074 implements two independent high-speed comparators sharing a common VCC and VEE supply pair, each featuring an input stage with 1.0pA typical bias current and 0.5mV typical offset voltage, enabling precision sensing at low signal levels without external trimming. Its push-pull output architecture eliminates external pull-up resistors and supports rail-to-rail swing into 8mA loads.
Internal hysteresis of ±2.5mV ensures noise-immune switching even with slow-moving inputs, while the unique output-stage design limits supply-current surges during transitions - maintaining stable 48µA quiescent current up to 1MHz switching frequency and eliminating need for large supply decoupling capacitors in sensitive analog sections.
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 circuitry |
| Propagation Delay | 120ns typical at 100mV overdrive; supports high-speed signal discrimination in real-time control loops |
| Quiescent Current | 48µA per comparator; allows multi-comparator operation in energy-critical battery applications |
| Input Common-Mode Range | Extends 0.25V beyond rails (–0.25V to VCC + 0.25V); permits accurate detection of signals near ground or supply rails |
| Output Drive Capability | Sinks and sources 8mA; drives LEDs, logic inputs, or small MOSFET gates directly without buffer stages |
| Input Offset Voltage | ±7mV max over temperature; ensures consistent trip-point accuracy across –40°C to +85°C industrial range |
| Hysteresis | ±2.5mV internal; prevents chatter on noisy or slowly varying inputs without external feedback components |
Pinout & Package
The MAX991EUA-TG074 is housed in an 8-pin µMAX package (pin pitch 0.65mm, body size 3.05mm × 3.05mm × 1.10mm), optimized for high-density PCB layouts and compatible with standard SMT reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTA | Comparator A output | Push-pull active output capable of sourcing/sinking 8mA; connects directly to logic or load without pull-up |
| 2 - IN–A | Comparator A inverting input | Differential input node with 1.0pA bias current; accepts signals down to –0.25V relative to VEE |
| 3 - IN+A | Comparator A noninverting input | Differential input node with rail-to-rail common-mode range; used for reference or signal comparison |
| 4 - VEE | Negative supply | Ground reference for single-supply operation (0V) or negative rail for dual-supply configurations |
| 5 - VCC | Positive supply | Primary power input (2.5V–5.5V); powers both comparators and internal hysteresis circuitry |
| 6 - IN+B | Comparator B noninverting input | Independent second comparator input; enables dual-threshold or window detection topologies |
| 7 - IN–B | Comparator B inverting input | Second differential input with identical specs to IN–A; supports fully independent channel operation |
| 8 - OUTB | Comparator B output | Independent push-pull output; allows asynchronous decision paths or redundant sensing channels |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O operation | Enables full dynamic range utilization in low-voltage systems (e.g., 3V ADC reference monitoring) |
| 120ns propagation delay | Supports >1MHz signal edge detection in motor commutation or digital line reception |
| 48µA per comparator supply current | Permits integration of dual comparators in coin-cell-powered IoT sensors with multi-year battery life |
| No phase reversal on overdriven inputs | Guarantees predictable output behavior when input exceeds supply rails by ≤0.3V |
| Internal 2.5mV hysteresis | Eliminates need for external positive-feedback resistors in basic threshold-detection circuits |
Applications
| Portable Power Monitoring | Zero-Crossing Detection |
|---|---|
|
Use Scenario: Monitoring battery voltage against low-battery cutoff threshold in handheld medical devices. IC Role / Device Role / Timing Role: Dual comparator configured as window detector to trigger shutdown before critical undervoltage. Use Value: Rail-to-rail inputs accurately sense near-ground thresholds; 48µA quiescent current minimizes standby drain. |
Use Scenario: Detecting AC line zero crossings in smart energy meters for synchronized sampling. IC Role / Device Role / Timing Role: Single comparator with grounded inverting input compares AC waveform to 0V reference. Use Value: 120ns delay ensures sub-microsecond timing resolution; internal hysteresis rejects EMI-induced false triggers. |
| Logic-Level Translation | Threshold Discriminator |
|
Use Scenario: Converting 5V microcontroller outputs to 3.3V-compatible signals for mixed-voltage FPGA interfaces. IC Role / Device Role / Timing Role: Comparator acting as unidirectional level shifter using VCC = 5V and output loaded to 3.3V rail. Use Value: Push-pull output avoids external pull-up resistor; rail-to-rail swing guarantees valid logic-high/low levels. |
Use Scenario: Detecting overtemperature condition via thermistor voltage divider in industrial motor controllers. IC Role / Device Role / Timing Role: Comparator comparing thermistor voltage to fixed reference to assert thermal fault flag. Use Value: 0.5mV typical offset voltage ensures <1°C trip-point error; 8mA drive directly activates optocoupler LED. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV393IDR | Higher 100µA supply current; 300ns propagation delay; no internal hysteresis | Requires external hysteresis resistors for noise immunity; less suitable for ultra-low-power designs | Preferred where cost sensitivity outweighs power/performance requirements |
| TLV3502CDR | 3.5ns propagation delay; 60µA supply current; rail-to-rail inputs only (not outputs) | Output swing limited to VCC – 0.1V; needs external pull-up for full logic-level translation | Chosen when nanosecond response is mandatory and output loading is light |
Compared with LMV393IDR and TLV3502CDR, the MAX991EUA-TG074 uniquely balances micropower operation (48µA), high speed (120ns), rail-to-rail I/O, and integrated hysteresis - making it optimal for compact, battery-operated systems requiring robust threshold detection without design overhead.
Availability
MAX991EUA-TG074 is available at Aetrix Electronics and suitable for portable power monitoring, zero-crossing detection, logic-level translation, and threshold discrimination requiring stable component supply across industrial and medical OEM programs.
Supply support for MAX991EUA-TG074 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, medical, and communications applications, emphasizing low power, high accuracy, and small-footprint packaging.
The MAX991EUA-TG074 belongs to Maxim's micropower comparator family engineered specifically for battery-powered instrumentation and portable systems where supply current, speed, and input/output voltage range must coexist without compromise.
FAQ
What is the maximum capacitive load the MAX991EUA-TG074 can drive while maintaining 120ns propagation delay?
The MAX991EUA-TG074 maintains its 120ns typical propagation delay up to 15pF capacitive load at VCC = 5V and 100mV overdrive. Delay increases to 210ns at 200pF load under same conditions, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics plot (TOC8). For reliable high-speed operation, keep PCB trace capacitance and downstream input capacitance below 15pF when timing-critical performance is required for the MAX991EUA-TG074.
Does the MAX991EUA-TG074 support dual-supply operation, and what are the allowable voltage ranges?
Yes, the MAX991EUA-TG074 supports dual-supply operation with VCC and VEE pins accepting ±1.25V to ±2.75V, resulting in total supply voltage range of 2.5V to 5.5V. The absolute maximum rating specifies supply voltage (VCC to VEE) ≤6V. This configuration enables true bipolar input signal handling and is validated across the full –40°C to +85°C temperature range. All electrical specifications in the datasheet apply to both single- and dual-supply modes for the MAX991EUA-TG074.
Can the MAX991EUA-TG074 outputs interface directly with 1.8V logic families?
No - the MAX991EUA-TG074 outputs swing rail-to-rail between VEE and VCC, so with VCC = 2.5V minimum, VOH is ≥2.3V (typical), exceeding 1.8V logic-high thresholds but risking overstress if VCC > 1.98V. To safely drive 1.8V logic, operate the MAX991EUA-TG074 with VCC = 1.8V (within its 2.5V–5.5V spec? No - 1.8V is below minimum). Therefore, direct interfacing is not supported; a level-shifter or open-drain comparator like MAX992 is required for 1.8V logic compatibility with the MAX991EUA-TG074.
What is the purpose of the "N.C." pins in the MAX991EUA-TG074 µMAX package?
The MAX991EUA-TG074 µMAX-8 package has no N.C. (No Connect) pins - all eight pins are functional: OUTA, IN–A, IN+A, VEE, VCC, IN+B, IN–B, and OUTB. The datasheet's Pin Description table lists N.C. only for larger packages (e.g., SO-14, TSSOP-14) used by quad variants MAX995/MAX996. Confusion may arise from generic family documentation, but the MAX991EUA-TG074 uses every pin; none are unused or internally disconnected.
How does the internal hysteresis of the MAX991EUA-TG074 affect its use in precision threshold applications?
The MAX991EUA-TG074 features fixed ±2.5mV internal hysteresis centered on its input offset voltage, which improves noise immunity but introduces a 5mV deadband around the trip point. For precision applications requiring trip-point accuracy better than ±2.5mV, external hysteresis must be disabled (not possible) or compensated via calibration - meaning the MAX991EUA-TG074 is best suited for robust threshold detection rather than sub-millivolt measurement. This hysteresis value is inherent to the MAX991EUA-TG074 and cannot be adjusted or removed.
MAX991EUA-TG074 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
MAX991EUA-TG074 FAQ
1.How can I place an order for MAX991EUA-TG074 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX991EUA-TG074 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-TG074 reliable?
The price and inventory of MAX991EUA-TG074 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX991EUA-TG074 is usually 5 days.
3.What payment methods are accepted for MAX991EUA-TG074?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX991EUA-TG074 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX991EUA-TG074?
MAX991EUA-TG074 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX991EUA-TG074 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-TG074?
For technical support, including MAX991EUA-TG074 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX991EUA-TG074 requirements.
6.How does Aetrix verify that MAX991EUA-TG074 is sourced from the original manufacturer or authorized distributors?
All MAX991EUA-TG074 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-TG074 meets industry standards.
7.What is the process for return or replacement of MAX991EUA-TG074?
All MAX991EUA-TG074 units undergo pre-shipment inspection (PSI). If there is an issue with MAX991EUA-TG074, 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-TG074 part is unused and in its original packaging.
Return procedure for MAX991EUA-TG074:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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