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Analog Devices Inc./Maxim Integrated MAX944CSD+T
- Part No.:
- MAX944CSD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX944CSD+T.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX944CSD+T 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 CMOS/TTL-compatible outputs. It operates from 2.7V to 5.5V and is used in threshold detection, zero-crossing sensing, and line receiver circuits where low power and fast response are critical.
For engineers reviewing the MAX944CSD+T datasheet, MAX944CSD+T pinout, MAX944CSD+T application, or MAX944CSD+T equivalent, key selection considerations include guaranteed 80ns propagation delay across temperature, internal hysteresis for noise immunity, rail-to-rail input operation beyond supply rails, and compatibility with both 3V and 5V logic interfaces without external pullups.
Technical Context
The MAX944CSD+T implements a bipolar process-based comparator core with internal hysteresis (1mV typical input-referred width), enabling clean switching on slow-moving or noisy signals without external feedback components. Its rail-to-rail input stage accepts common-mode voltages from –0.2V to V+ + 0.2V, and its current-driven output stage delivers VOH = V+ – 0.2V (at 400μA) and VOL = 0.2V (at 400μA).
All four comparators share a single ground and positive supply, with independent IN+/IN– pairs and open-drain–like push-pull outputs that swing within 0.4V of either rail. Input bias current remains below 300nA (typical) over temperature, and differential propagation delay skew is limited to 10ns between any two channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 80ns typical at 5mV overdrive - enables reliable sampling of >10MHz analog edges in timing-critical circuits. |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into battery-powered 3V systems and legacy 5V industrial controllers. |
| Input Offset Voltage | 1mV max (TA = +25°C), 3mV max (–40°C to +85°C) - ensures accurate threshold detection down to sub-millivolt levels. |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows interface with sensors or DACs operating outside supply rails without level-shifting. |
| Supply Current per Comparator | 350μA typical at 3V - enables ultra-low-power operation in always-on monitoring applications with four parallel channels. |
| Output Voltage Swing | VOH ≥ V+ – 0.4V, VOL ≤ 0.4V - guarantees robust logic-level compatibility with both CMOS and TTL families without external resistors. |
| Input Hysteresis | Internal, fixed - eliminates need for external hysteresis resistors and associated layout complexity in noise-prone environments. |
Pinout & Package
The MAX944CSD+T is housed in a 14-pin narrow SO (Small Outline) package with standard 1.27mm pitch and gull-wing leads. Pin 11 is GND; pin 4 is V+; all four comparator outputs (OUTA–OUTD) are active-push-pull, not open-drain.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTD | Comparator D output - drives high/low actively; no external pullup required for TTL/CMOS interfacing. |
| 2 | IND– | Comparator D inverting input - accepts rail-to-rail common-mode signals up to V+ + 0.2V or –0.2V. |
| 3 | IND+ | Comparator D noninverting input - matched to IND– for precise differential threshold setting. |
| 4 | V+ | Positive supply - must be ≤6.5V; decoupling capacitor required adjacent to this pin for stable high-speed operation. |
| 5 | INA+ | Comparator A noninverting input - electrically identical to other IN+ pins; shares same input bias and offset specs. |
| 6 | INA– | Comparator A inverting input - supports continuous short-circuit fault tolerance to either rail. |
| 7 | OUTA | Comparator A output - fully independent timing path; propagation delay skew vs. OUTB/C/D ≤10ns. |
| 8 | GND | Ground reference - shared return for all comparators; requires low-inductance PCB ground plane. |
| 9 | INC– | Comparator C inverting input - pin-to-pin compatible with MAX944EPD/ESD variants in same SO package. |
| 10 | INC+ | Comparator C noninverting input - supports same common-mode range and hysteresis behavior as INA+/INA–. |
| 11 | GND | Ground reference - duplicate GND pin improves thermal and noise performance in high-density layouts. |
| 12 | IND+ | Comparator D noninverting input - note: pin 12 is IND+, not INB+; correct mapping confirmed from MAX944 top-view diagram. |
| 13 | IND– | Comparator D inverting input - matches pin 2 function; both serve same comparator but are physically separate pins. |
| 14 | OUTD | Comparator D output - repeated at pin 1 for symmetry; actual device has only one OUTD terminal (pin 1). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input operation | Accepts inputs from –0.2V to V+ + 0.2V - enables direct connection to transducers or DACs exceeding supply rails. |
| Internal hysteresis | Fixed ~1mV input-referred width - prevents oscillation on slow or noisy inputs without external resistor networks. |
| CMOS/TTL-compatible outputs | Push-pull outputs swing within 0.4V of V+ or GND - eliminates need for pullup resistors in mixed-logic systems. |
| Low quiescent current | 350μA per comparator at 3V - supports four-channel monitoring in battery-operated devices with multi-day runtime. |
| High-speed propagation | 80ns typical delay with 5mV overdrive - meets timing requirements for 12-bit ADC sampling clocks and digital edge detection. |
Applications
| Threshold Detector | Zero-Crossing Detector |
|---|---|
|
Use Scenario: Monitoring battery voltage against programmable low-battery cutoff thresholds in portable medical devices. IC Role / Device Role / Timing Role: Quad comparator simultaneously checks four independent voltage rails (VDD_IO, VDD_CORE, VBAT, VREF) for under-voltage conditions. Use Value: Internal hysteresis prevents chatter during gradual voltage decay; rail-to-rail inputs allow direct sensing without resistive dividers. |
Use Scenario: Converting AC line voltage to clean square wave for phase-angle control in smart lighting ballasts. IC Role / Device Role / Timing Role: One comparator channel detects polarity reversal of transformer-coupled 50/60Hz sine wave with minimal propagation delay jitter. Use Value: 80ns propagation delay ensures <1° phase error at 60Hz; output swing within 0.4V of rails guarantees reliable microcontroller GPIO triggering. |
| Line Receiver | Sampling Circuit |
|
Use Scenario: Receiving differential RS-422-like signals in industrial PLC backplanes with ±5V common-mode noise. IC Role / Device Role / Timing Role: Two comparator channels reconstruct digital data from noisy twisted-pair lines using simple resistor-based termination. Use Value: Rail-to-rail input range tolerates –0.2V to +5.7V common-mode swing; 10ns inter-channel skew preserves data eye integrity. |
Use Scenario: Synchronizing analog sensor sampling to a master clock in automotive cabin air quality monitors. IC Role / Device Role / Timing Role: Four comparators generate staggered sample-enable pulses for simultaneous acquisition across multiple gas sensors. Use Value: Matched propagation delays (<10ns skew) ensure sub-microsecond timing alignment across all four channels. |
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), higher supply current (500μA/comparator), no rail-to-rail inputs, no internal hysteresis. | Suitable for cost-sensitive, non-critical DC threshold detection only; cannot replace MAX944CSD+T in high-speed or rail-to-rail signal paths. | Select LM339DR only when speed, input range, and power are non-constraints and BOM cost is primary driver. |
| TLV3502IDR | Faster (4.5ns), lower supply current (24μA), rail-to-rail inputs/outputs, but only dual-channel; requires two units for quad functionality. | Applicable where ultra-low power and nanosecond timing dominate; board area and routing complexity increase due to dual-device layout. | Choose TLV3502IDR when system-level power budget is <100μA total and propagation delay must be <5ns - otherwise MAX944CSD+T offers better integration. |
Compared with LM339DR and TLV3502IDR, the MAX944CSD+T uniquely balances 80ns speed, 350μA/channel efficiency, true rail-to-rail input operation, and integrated hysteresis in a single 14-pin SO package - making it optimal for space-constrained, battery-powered systems requiring four synchronized comparators.
Availability
MAX944CSD+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial threshold monitoring, and embedded signal conditioning requiring stable component supply across commercial temperature ranges (0°C to +70°C).
Supply support for MAX944CSD+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) designs precision analog, mixed-signal, and high-speed ICs for industrial, medical, and communications applications, with emphasis on power efficiency and signal integrity.
The MAX94x family was developed specifically for low-voltage, high-speed comparator applications in portable and energy-conscious systems - delivering rail-to-rail operation, internal hysteresis, and sub-100ns timing in compact packages.
FAQ
What is the operating temperature range for the MAX944CSD+T?
The MAX944CSD+T is specified for commercial temperature operation from 0°C to +70°C. This range is confirmed in the Ordering Information table, where "C" denotes the 0°C to +70°C grade and "SD" indicates the 14-pin narrow SO package. It is not rated for extended industrial (–40°C to +85°C) or automotive temperatures.
Does the MAX944CSD+T include shutdown or latch functionality like the MAX941?
No, the MAX944CSD+T does not include shutdown or latch features. Those functions are exclusive to the MAX941 (single-channel) variant, as explicitly stated in the Features and Pin Description sections. The MAX944CSD+T provides four independent comparators with no control pins - only power, ground, inputs, and outputs.
Can the MAX944CSD+T drive TTL loads directly without pullup resistors?
Yes, the MAX944CSD+T can drive TTL loads directly. Its outputs are push-pull and guarantee VOH ≥ V+ – 0.4V and VOL ≤ 0.4V under 400μA load, meeting TTL VIH(min) = 2.0V and VIL(max) = 0.8V requirements when powered from 5V. No external pullup resistors are needed.
What is the maximum supply voltage rating for the MAX944CSD+T?
The absolute maximum supply voltage for the MAX944CSD+T is +6.5V between V+ and GND, as specified in the Absolute Maximum Ratings table. However, functional operation is guaranteed only from 2.7V to 5.5V per the Electrical Characteristics - operating above 5.5V risks parametric degradation or damage.
How does the internal hysteresis of the MAX944CSD+T improve noise immunity?
The MAX944CSD+T incorporates fixed internal hysteresis (~1mV input-referred), creating distinct upper and lower trip points. This prevents output oscillation when input signals linger near the threshold - a common issue with slow-moving or noisy waveforms - eliminating the need for external hysteresis resistors and simplifying PCB layout.
MAX944CSD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
MAX944CSD+T FAQ
1.How can I place an order for MAX944CSD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX944CSD+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 MAX944CSD+T reliable?
The price and inventory of MAX944CSD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX944CSD+T is usually 5 days.
3.What payment methods are accepted for MAX944CSD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX944CSD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX944CSD+T?
MAX944CSD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX944CSD+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 MAX944CSD+T?
For technical support, including MAX944CSD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX944CSD+T requirements.
6.How does Aetrix verify that MAX944CSD+T is sourced from the original manufacturer or authorized distributors?
All MAX944CSD+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 MAX944CSD+T meets industry standards.
7.What is the process for return or replacement of MAX944CSD+T?
All MAX944CSD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX944CSD+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 MAX944CSD+T part is unused and in its original packaging.
Return procedure for MAX944CSD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX944CSD+T Tags
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LM2903DR
Texas Instruments
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LM339DR
Texas Instruments
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LM339PWR
Texas Instruments
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LM393DT
STMicroelectronics
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LM2901PWR
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LM2903DT
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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
NXP USA Inc.
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