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Analog Devices Inc./Maxim Integrated MAX989EKA
- Part No.:
- MAX989EKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-8
- Datasheet:
-
MAX989EKA.pdf
- Description:
- IC COMPARATOR 2 GEN PUR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
MAX989EKA from Maxim Integrated is a dual micropower rail-to-rail input/output comparator with push-pull output stage, operating from 2.5V to 5.5V single supply or ±1.25V to ±2.75V dual supply, consuming only 11µA per comparator, achieving 300ns propagation delay at 100mV overdrive, and supporting 8mA output drive capability - ideal for battery-powered zero-crossing detection and threshold monitoring in portable instrumentation.
For engineers reviewing the MAX989EKA datasheet, MAX989EKA pinout, MAX989EKA application, or MAX989EKA equivalent, key selection criteria include its dual-channel push-pull architecture, guaranteed 300ns tPD across -40°C to +85°C, rail-to-rail I/O with 0.25V beyond rails common-mode range, and SOT23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX989EKA implements two independent comparators sharing a common VCC and VEE, each featuring internal 3mV hysteresis to prevent chatter on slow-moving inputs and an input bias current of 1.0pA enabling high-impedance sensing. Its push-pull output stage eliminates external pull-up resistors and delivers rail-to-rail swing under 8mA load.
Unlike open-drain variants (e.g., MAX990), the MAX989EKA's output actively sources and sinks current, reducing system component count in level-shifting and window-comparator topologies. The device's supply-current surge during switching is minimized by proprietary output-stage design, limiting supply glitches even at 1MHz transition frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V single supply - supports direct integration into both 3V and 5V systems without level translation. |
| Quiescent Current | 11µA per comparator - enables multi-year operation on coin-cell batteries in always-on sensor nodes. |
| Propagation Delay | 300ns at 100mV overdrive - ensures timely response in fast edge-detection applications like digital line receivers. |
| Input Offset Voltage | ±5mV max - guarantees accurate threshold detection down to sub-10mV signal levels in precision discriminators. |
| Common-Mode Range | Extends 0.25V beyond rails - allows direct connection to signals exceeding VCC or going below VEE without phase reversal. |
| Output Drive | Sources/sinks 8mA - drives LEDs, logic inputs, or small MOSFET gates directly without external buffers. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin environments without derating. |
Pinout & Package
MAX989EKA is housed in an 8-pin SOT23 package (package code K8+5, outline 21-0078), measuring 4.9mm × 6.0mm × 1.6mm, with exposed pad optional for thermal enhancement. Pin 1 is marked via laser top-side marking "AADZ".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Comparator A Output | Push-pull active output capable of sourcing/sinking 8mA; no external pull-up required. |
| 2 (INA−) | Comparator A Inverting Input | High-impedance node (1.0pA bias) accepting signals from −0.25V to VCC+0.25V. |
| 3 (INA+) | Comparator A Noninverting Input | Same voltage range and impedance as INA−; differential pair input for A channel. |
| 4 (VEE) | Negative Supply Rail | Ground reference for single-supply operation; may be connected to −2.75V in dual-supply mode. |
| 5 (VCC) | Positive Supply Rail | Accepts 2.5V–5.5V; powers both comparators and internal hysteresis circuitry. |
| 6 (INB+) | Comparator B Noninverting Input | Independent input for second comparator; identical specs to INA+. |
| 7 (INB−) | Comparator B Inverting Input | Independent input for second comparator; identical specs to INA−. |
| 8 (OUTB) | Comparator B Output | Functionally identical to OUTA; fully independent push-pull output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O with extended common-mode range | Enables direct interface to sensors or DACs operating near supply rails without attenuation or clamping circuits. |
| 11µA quiescent current per comparator | Reduces total system standby power to <22µA for dual-channel monitoring, critical for IoT endpoint longevity. |
| 300ns propagation delay at 100mV overdrive | Supports reliable detection of >3MHz digital edges in communication line receivers or clock recovery circuits. |
| Internal 3mV hysteresis | Eliminates need for external positive-feedback resistors in noisy environments such as motor-control feedback loops. |
| Push-pull output stage | Removes dependency on external pull-up resistors, simplifying BOM and improving rise/fall time consistency vs. open-drain alternatives. |
Applications
| Zero-Crossing Detection | Threshold Monitoring |
|---|---|
Use Scenario: Detecting AC waveform polarity transitions in audio signal conditioning or mains-synchronized power control. IC Role / Device Role / Timing Role: Dual comparator configured as precision zero-cross detector with one channel referenced to ground and hysteresis suppressing noise-induced false triggers. Use Value: Achieves sub-microsecond timing accuracy and immunity to 50/60Hz harmonics due to 300ns tPD and 3mV hysteresis. | Use Scenario: Monitoring battery voltage against low-charge and over-voltage thresholds in handheld medical devices. IC Role / Device Role / Timing Role: One comparator detects under-voltage (e.g., <3.0V), the other detects over-voltage (e.g., >4.3V), forming a window comparator. Use Value: Delivers rail-to-rail input range allowing direct connection to Li-ion cell without resistor dividers, preserving ADC resolution. |
| Logic-Level Translation | Digital Line Reception |
Use Scenario: Converting 5V microcontroller GPIO outputs to 3.3V-compatible signals for interfacing with low-voltage peripherals. IC Role / Device Role / Timing Role: Comparator used as unidirectional level shifter with VCC = 5V and reference set at 1.65V to define 3.3V logic thresholds. Use Value: Push-pull output ensures clean 3.3V logic-high without pull-up resistor loading or RC delays. | Use Scenario: Recovering digital data from attenuated or distorted RS-485 or CAN bus signals in industrial gateways. IC Role / Device Role / Timing Role: High-speed comparator reconstructing clean square waves from degraded differential inputs using internal hysteresis. Use Value: 300ns tPD and 1.0pA input bias enable reliable reception up to 3Mbps without external amplification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX990EKA+T | Open-drain output, same SOT23-8 package, identical supply range and quiescent current. | Requires external pull-up resistor; supports level translation beyond VCC (up to 6V above VEE). | Select when interfacing mixed-voltage domains or driving wired-AND buses. |
| LM393DR | Higher 1.2mA supply current, slower 1.3µs tPD, no rail-to-rail inputs, SOIC-8 only. | Limited to 2V–36V supply; unsuitable for sub-3V battery operation or precision low-offset applications. | Select only for cost-sensitive, non-battery, wide-supply industrial controls where speed and offset are not critical. |
Compared with MAX990EKA+T, MAX989EKA eliminates pull-up components and improves rise time; compared with LM393DR, it reduces supply current by 109× and propagation delay by 4.3×, enabling next-generation ultra-low-power sensing architectures.
Availability
MAX989EKA is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical monitors, and industrial sensor interfaces requiring stable component supply and long-term lifecycle support.
Supply support for MAX989EKA 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 power, sensing, and interface applications, with global manufacturing and qualification to AEC-Q200 and industrial reliability standards.
The MAX985/MAX989 family targets ultra-low-power, rail-to-rail comparator applications in space-constrained, battery-operated systems where supply current, propagation delay, and input voltage range are critical design parameters.
FAQ
What is the maximum capacitive load the MAX989EKA can drive while maintaining 300ns propagation delay?
The MAX989EKA maintains ≤300ns propagation delay for CL ≤ 15pF at VCC = 5V and 100mV overdrive. At CL = 50pF, tPD increases to 450ns; at CL = 200pF, it reaches 550ns. For loads >15pF, consider adding a series resistor near the output to damp ringing without significantly degrading speed.
Does the MAX989EKA support dual-supply operation, and what are the valid voltage ranges?
Yes, the MAX989EKA supports dual-supply operation with VEE ranging from −2.75V to −1.25V and VCC ranging from +1.25V to +2.75V, resulting in total supply voltage ≤6V. This configuration enables true bipolar input signal handling and is validated across the full −40°C to +85°C temperature range.
Can the MAX989EKA's inputs safely exceed the supply rails, and by how much?
Yes - the MAX989EKA's inputs tolerate voltages from −0.25V to VCC + 0.25V, verified by design and tested per Absolute Maximum Ratings. Exceeding this range forward-biases internal ESD diodes, increasing input bias current exponentially; sustained overvoltage may cause latch-up or permanent damage.
Is the MAX989EKA pin-compatible with other devices in the MAX985/MAX989 family?
No - the MAX989EKA (SOT23-8) shares pinout with MAX990EKA+T but is not pin-compatible with MAX985 (SC70-5/UCSP-6) or MAX993 (TSSOP-14). Its SOT23-8 footprint matches only the dual-channel variants: MAX989, MAX990, and their µMAX/SO equivalents with identical pin 1–8 assignments.
What is the output voltage swing capability of the MAX989EKA under 8mA load?
At VCC = 5.0V and ISINK = 8mA, the MAX989EKA guarantees VOL ≤ 0.4V; at VCC = 2.7V and ISINK = 3.5mA, VOL ≤ 0.2V. For sourcing, VOH ≥ 4.45V (VCC = 5V, ISOURCE = 8mA) and ≥2.3V (VCC = 2.7V, ISOURCE = 3.5mA), confirming true rail-to-rail swing under rated load conditions.
MAX989EKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SOT-23-8
- Series:
- -
- Packaging:
- Bulk
- 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
- :
- 5mV @ 5.5V
- Voltage - Input Offset (Max):
- 0.01µA @ 5.5V
- Current - Input Bias (Max):
- 95mA @ 5.5V
- Current - Output (Typ):
- 20µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 450ns (Typ)
- Propagation Delay (Max):
- ±3mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-8
MAX989EKA FAQ
1.How can I place an order for MAX989EKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX989EKA 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 MAX989EKA reliable?
The price and inventory of MAX989EKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX989EKA is usually 5 days.
3.What payment methods are accepted for MAX989EKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX989EKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX989EKA?
MAX989EKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX989EKA 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 MAX989EKA?
For technical support, including MAX989EKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX989EKA requirements.
6.How does Aetrix verify that MAX989EKA is sourced from the original manufacturer or authorized distributors?
All MAX989EKA 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 MAX989EKA meets industry standards.
7.What is the process for return or replacement of MAX989EKA?
All MAX989EKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX989EKA, 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 MAX989EKA part is unused and in its original packaging.
Return procedure for MAX989EKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX989EKA Tags
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LM2903DR
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LM339DR
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LM339PWR
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LM393DT
STMicroelectronics
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LM2901PWR
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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LM393ADR
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NCX2200GMAZ
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