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Analog Devices Inc./Maxim Integrated MAX944ESD
- Part No.:
- MAX944ESD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX944ESD.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,949
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Product details
Overview
MAX944ESD from Maxim Integrated is a quad high-speed comparator optimized for 3V/5V single-supply systems, featuring rail-to-rail inputs, 80ns propagation delay (5mV overdrive), 350μA per comparator supply current, and ±0.2V input common-mode range beyond rails. It operates from 2.7V to 5.5V and interfaces directly with CMOS/TTL logic in battery-powered threshold detection circuits.
For engineers reviewing the MAX944ESD datasheet, MAX944ESD pinout, MAX944ESD application, or MAX944ESD equivalent, key selection criteria include guaranteed 80ns timing at 5mV overdrive, rail-to-rail input operation down to 2.7V, internal hysteresis eliminating external components, and SO-14 packaging suitable for space-constrained industrial sensing and line receiver designs.
Technical Context
The MAX944ESD implements a bipolar process comparator core with fixed internal hysteresis (±1mV trip point width), enabling clean switching on slow-moving signals without external feedback. Its rail-to-rail input stage accepts voltages from –0.2V to V+ + 0.2V, while the current-driven output stage delivers VOH = V+ – 0.2V (at 400μA) and VOL = 0.2V (at 400μA).
Each of the four independent comparators shares a common V+ and GND, with no cross-channel latch or shutdown functions-unlike the MAX941. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns, supporting synchronized multi-threshold detection in sampling circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports direct interface with 3.3V and 5V logic domains without level shifting |
| Propagation Delay | 80ns (typical, 5mV overdrive) - enables reliable sampling of signals up to ~10MHz edge rates |
| Input Offset Voltage | 1mV (typ, TA = +25°C), 3mV (max, –40°C to +85°C) - ensures precise threshold discrimination in sensor interfaces |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows input signals to exceed supply rails, critical for fault-tolerant line receivers |
| Supply Current per Comparator | 350μA (typ, V+ = 3V) - enables four-channel comparison in battery-powered systems with <1.4mA total quiescent draw |
| Output Swing | VOL = 0.2V / VOH = V+ – 0.2V (at 400μA) - guarantees TTL/CMOS-compatible logic levels without pull-up resistors |
| Input Common-Mode Rejection | 80μV/V (min) - maintains accuracy despite supply ripple or ground bounce in noisy industrial environments |
Pinout & Package
MAX944ESD is housed in a 14-pin narrow SO package (S14-1, outline 21-0041), RoHS-compliant, with 1.27mm pitch and 8.65mm × 3.91mm body size. Thermal resistance θJA = 8.33mW/°C above +70°C (667mW max dissipation at TA = +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain–like output; sinks to 0.2V, sources to V+ – 0.2V; compatible with CMOS/TTL loads |
| 2 | INA− | Inverting input for Comparator A; accepts –0.2V to V+ + 0.2V; protected by internal 4.1kΩ series resistors |
| 3 | INA+ | Noninverting input for Comparator A; same voltage range and protection as INA− |
| 4 | V+ | Positive supply rail (2.7V–5.5V); must be bypassed with 0.1μF ceramic capacitor placed adjacent to pin |
| 5 | INB+ | Noninverting input for Comparator B; electrically identical to INA+; no crosstalk with other channels |
| 6 | INB− | Inverting input for Comparator B; matches INA− specs; supports independent dual-threshold configuration |
| 7 | OUTB | Comparator B output; identical drive strength and voltage swing to OUTA |
| 8 | OUTC | Comparator C output; fully independent; enables three-level window detection when paired with OUTA/OUTB |
| 9 | INC− | Inverting input for Comparator C; same ESD and overvoltage tolerance as all inputs |
| 10 | INC+ | Noninverting input for Comparator C; supports high-precision reference comparison in analog front-ends |
| 11 | GND | Analog/digital ground return; requires low-inductance connection to solid ground plane for stable 80ns timing |
| 12 | IND+ | Noninverting input for Comparator D; enables fourth independent decision channel in compact layout |
| 13 | IND− | Inverting input for Comparator D; matched to other inputs for consistent hysteresis and offset behavior |
| 14 | OUTD | Comparator D output; completes quad-channel set; supports parallel processing of four analog thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input operation | Accepts inputs from –0.2V to V+ + 0.2V, enabling direct connection to sensors or transducers exceeding supply rails |
| Fixed internal hysteresis | Eliminates need for external hysteresis resistors and associated board area, simplifying PCB layout for noise-immune thresholding |
| 80ns propagation delay | Guaranteed at 5mV overdrive, supporting accurate timing-critical applications like zero-crossing detection in AC line monitoring |
| Low 350μA/comparator supply current | Enables always-on quad-comparator functionality in portable devices with multi-day battery life at 3.3V operation |
| CMOS/TTL-compatible outputs | VOH/VOL meet both logic families' VIH/VIL thresholds without external pull-ups, reducing BOM count and interconnect complexity |
| Input short-circuit tolerance | All inputs withstand continuous fault conditions to either rail, improving robustness in industrial I/O modules exposed to wiring faults |
Applications
| Battery-Powered Threshold Detection | Industrial Line Receiver |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.2V and pre-charge enable below 3.0V. IC Role / Device Role / Timing Role: Quad comparator independently compares cell voltage against four precision references (e.g., 3.0V, 3.6V, 4.0V, 4.2V) using resistor-divider networks. Use Value: Single MAX944ESD replaces four discrete comparators, reducing footprint by 60% and eliminating four sets of hysteresis resistors. |
Use Scenario: Converting RS-422 differential signals to single-ended TTL levels in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Two comparators (A/B) detect differential polarity; third (C) validates signal presence via common-mode window; fourth (D) provides fault flag. Use Value: Rail-to-rail inputs tolerate ±10V common-mode offsets on twisted-pair lines, while 80ns delay ensures real-time response to 10Mbps data streams. |
| Zero-Crossing Detector for AC Mains | Multi-Level Sampling Circuit |
|
Use Scenario: Detecting AC line zero crossings in smart energy meters to synchronize ADC sampling and TRIAC firing. IC Role / Device Role / Timing Role: One comparator (A) compares rectified sine wave against 0V reference; internal hysteresis prevents chatter near zero crossing. Use Value: 1mV offset voltage and 80ns delay ensure timing jitter <1μs, enabling sub-0.1% energy measurement accuracy at 50/60Hz. |
Use Scenario: Digitizing analog sensor outputs (e.g., temperature, pressure) into 4-bit gray code using flash ADC architecture. IC Role / Device Role / Timing Role: All four comparators simultaneously compare input voltage against four reference levels (VREF×0.25, 0.5, 0.75, 1.0). Use Value: Matched propagation delays (<10ns skew) guarantee monotonic output codes, preventing metastability in encoder interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339DR | Slower (1.3μs propagation delay), higher supply current (500μA/comparator), no rail-to-rail inputs (limited to V+ – 1.5V), no internal hysteresis | Suitable only for DC or low-frequency thresholding where speed and rail-to-rail operation are not required | Select LM339DR only for cost-sensitive, non-critical applications with ample timing margin and supply headroom |
| TLV3704IPW | Faster (65ns), lower supply current (85μA/comparator), rail-to-rail inputs/outputs, but specified only to 5.5V and lacks input overvoltage tolerance beyond rails | Better for ultra-low-power portable designs, but unsuitable for industrial line receivers requiring >±0.2V rail excursion | Choose TLV3704IPW when minimizing power dominates and input signals stay strictly within rails; avoid where fault tolerance is mandatory |
Compared with LM339DR, MAX944ESD delivers 16× faster response and eliminates external hysteresis components; versus TLV3704IPW, it trades 20ns speed for robust ±0.2V rail-overdrive capability essential in harsh electrical environments.
Availability
MAX944ESD is available at Aetrix Electronics and suitable for battery-powered systems, industrial line receivers, zero-crossing detectors, and multi-level sampling circuits requiring stable component supply across extended temperature ranges.
Supply support for MAX944ESD 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 and mixed-signal ICs for industrial, communications, and consumer applications.
The MAX94x family was designed specifically for high-speed, low-power, single-supply comparator applications in portable and industrial systems requiring rail-to-rail inputs and CMOS/TTL compatibility.
FAQ
What is the operating temperature range for MAX944ESD?
The MAX944ESD is rated for –40°C to +85°C ambient operation, as confirmed by its ordering suffix 'ESD' ('E' = –40°C to +85°C, 'SD' = 14-pin SO package). This range is validated across all electrical specifications including propagation delay, offset voltage, and supply current, making MAX944ESD suitable for industrial control cabinets and outdoor metering equipment.
Does MAX944ESD include internal hysteresis, and how does it affect design?
Yes, MAX944ESD features fixed internal hysteresis of approximately ±1mV, which eliminates the need for external hysteresis resistors. This simplifies PCB layout and ensures consistent noise immunity across all four comparators without tuning. The hysteresis width is inherent to the device's input stage and cannot be adjusted, so MAX944ESD is ideal for applications where predictable, maintenance-free threshold stability is required.
Can MAX944ESD operate from a 2.7V supply, and what performance changes occur?
Yes, MAX944ESD is fully specified from 2.7V to 5.5V. At 2.7V, propagation delay increases to 150ns (max), supply current drops to 350μA (typ), and output swing becomes VOH = 2.5V / VOL = 0.2V. These shifts are documented in the Electrical Characteristics table and do not compromise functionality-making MAX944ESD viable for single-cell Li-ion (3.0V nominal) and two-cell alkaline (3.2V fresh) battery systems.
What is the maximum capacitive load MAX944ESD can drive while maintaining 80ns propagation delay?
MAX944ESD maintains its 80ns typical propagation delay with ≤15pF capacitive load, as tested per the datasheet conditions (RS = 10Ω, VOD = 5mV). Driving >15pF increases delay linearly-e.g., 50pF raises tPD to ~120ns. For heavier loads, add a buffer or reduce trace capacitance; the current-driven output stage inherently trades speed for EMI reduction in noisy environments.
Is MAX944ESD pin-compatible with other MAX94x family members?
No, MAX944ESD is not pin-compatible with MAX941 or MAX942 due to its 14-pin SO package and quad-channel topology. While MAX941 (8-pin) and MAX942 (8-pin) share pinouts within their respective packages, MAX944ESD uses a unique 14-pin arrangement with dedicated pins for all four outputs and inputs. Migration requires PCB redesign but retains identical electrical behavior per channel.
MAX944ESD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- CMOS, Push-Pull, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.5V
- :
- 2mV @ 5.5V
- Voltage - Input Offset (Max):
- 0.15µA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 600µA
- Current - Quiescent (Max):
- 81.94dB CMRR, 81.94dB PSRR
- CMRR, PSRR (Typ):
- 80ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
MAX944ESD FAQ
1.How can I place an order for MAX944ESD through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX944ESD 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 MAX944ESD reliable?
The price and inventory of MAX944ESD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX944ESD is usually 5 days.
3.What payment methods are accepted for MAX944ESD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX944ESD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX944ESD?
MAX944ESD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX944ESD 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 MAX944ESD?
For technical support, including MAX944ESD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX944ESD requirements.
6.How does Aetrix verify that MAX944ESD is sourced from the original manufacturer or authorized distributors?
All MAX944ESD 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 MAX944ESD meets industry standards.
7.What is the process for return or replacement of MAX944ESD?
All MAX944ESD units undergo pre-shipment inspection (PSI). If there is an issue with MAX944ESD, 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 MAX944ESD part is unused and in its original packaging.
Return procedure for MAX944ESD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX944ESD Tags
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LM339DR
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LM393DT
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LM2903DT
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LM393DR
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LM239DR
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LM2903P
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NCX2200GMAZ
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