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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:3,988
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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 CMOS/TTL-compatible outputs. It operates from 2.7V to 5.5V and is used in threshold detection, zero-crossing detection, and line receiver circuits where low power and fast response are critical.
For engineers reviewing the MAX944ESD+ datasheet, MAX944ESD+ pinout, MAX944ESD+ application, or MAX944ESD+ equivalent, key selection criteria include guaranteed 80ns propagation delay at 5mV overdrive, rail-to-rail input common-mode range extending beyond both supply rails, output swing within 0.4V of V+ or GND without pullups, internal hysteresis for noise immunity, and compatibility with 3V/5V battery-powered and industrial control systems.
Technical Context
The MAX944ESD+ implements a bipolar process-based comparator core with fixed internal hysteresis (1mV typical input-referred width), enabling clean switching on slow-moving or noisy signals without external components. Its rail-to-rail input stage supports common-mode voltages from –0.2V to V+ + 0.2V, and its current-driven output stage delivers VOH ≥ V+ – 0.4V and VOL ≤ 0.4V at 400μA load.
Designed as a quad device in 14-pin SO package, it shares architecture with the MAX941 (single) and MAX942 (dual) but excludes latch and shutdown functions-those are exclusive to MAX941. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns, supporting precise multi-channel timing alignment in sampling and monitoring applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 80ns typical at 5mV overdrive - enables sub-12.5MHz signal edge detection in real-time discriminators |
| Supply Voltage Range | 2.7V to 5.5V - supports direct operation from Li-ion batteries (3.0–3.7V) and standard 3.3V/5V rails |
| Input Offset Voltage | 1mV max (TMIN to TMAX) - ensures accurate threshold setting down to ±1mV resolution in precision detectors |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows interface to sensors or DACs operating outside supply rails, e.g., negative-going transients |
| Supply Current per Comparator | 350μA typical at 3V - total 1.4mA quiescent for all four comparators, suitable for always-on battery monitoring |
| Output Voltage Swing | VOL ≤ 0.4V / VOH ≥ V+ – 0.4V at 400μA - directly drives 74HC/74AHC logic without level-shifting or pullup resistors |
| Input Bias Current | 150–400nA - minimizes loading error on high-impedance sources like photodiode amplifiers or RC timing networks |
Pinout & Package
MAX944ESD+ is housed in a 14-pin narrow SO (Small Outline) package, 150 mil width, RoHS-compliant, with standard 1.27mm pitch and exposed pad not present. Pin 11 is GND; pins 1, 4, 6, 9, 12, and 14 are dedicated to comparator inputs and outputs; pin 8 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTD | Comparator D open-drain compatible output - sinks current to GND; requires external pullup for logic-high assertion |
| 2 | IND– | Comparator D inverting input - accepts signals up to V+ + 0.2V or down to –0.2V relative to GND |
| 3 | IND+ | Comparator D noninverting input - same rail-to-rail voltage tolerance; differential pair with IND– defines D's trip point |
| 4 | GND | Ground reference - must connect to low-impedance system ground plane to maintain 80ns timing accuracy |
| 5 | V+ | Positive supply - accepts 2.7V–5.5V; decoupling capacitor (0.1μF ceramic) required within 2mm of this pin |
| 6 | INA+ | Comparator A noninverting input - identical electrical specs to IND+; independent channel with no crosstalk impact |
| 7 | INA– | Comparator A inverting input - paired with INA+; internal hysteresis applied across this differential pair |
| 8 | OUTA | Comparator A output - same drive strength and voltage swing as OUTD; not open-drain; actively drives high/low |
| 9 | INC+ | Comparator C noninverting input - electrically isolated from other channels; supports independent threshold programming |
| 10 | INC– | Comparator C inverting input - matched offset and bias current to INA–/IND– for consistent multi-channel performance |
| 11 | GND | Ground reference - shared with pin 4; both GND pins must be soldered and connected to same ground net |
| 12 | IND+ | Comparator D noninverting input - redundant labeling in datasheet; pin 3 is primary IND+, pin 12 is not connected |
| 13 | IND– | Comparator D inverting input - redundant labeling; pin 2 is primary IND–, pin 13 is not connected |
| 14 | OUTD | Comparator D output - duplicate of pin 1; actual pin 14 is OUTD per top-view diagram and pin description table |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends –0.2V below GND and +0.2V above V+, enabling direct interface to overvoltage-sensing circuits and bipolar signal sources |
| Internal hysteresis | Fixed 1mV input-referred hysteresis eliminates need for external feedback resistors and prevents chatter on slow or noisy inputs |
| CMOS/TTL-compatible outputs | VOH ≥ V+ – 0.4V and VOL ≤ 0.4V at 400μA ensure reliable logic-level translation without external level shifters |
| Low 350μA per comparator supply current | Enables full quad operation at <1.4mA total, critical for multi-threshold monitoring in energy-constrained IoT endpoints |
| 80ns propagation delay (5mV overdrive) | Supports >10MHz edge-rate detection in sampling circuits and high-speed line receivers with minimal timing uncertainty |
Applications
| Threshold Detector | Zero-Crossing Detector |
|---|---|
Use Scenario: Monitoring battery voltage against multiple thresholds (e.g., 3.3V, 3.0V, 2.8V, 2.5V) to trigger low-power mode, warning, shutdown, and critical fault states. IC Role / Device Role / Timing Role: Each of the four comparators independently compares a resistor-divider voltage against a stable reference, generating asynchronous digital flags. Use Value: Eliminates microcontroller ADC polling overhead; provides deterministic, sub-100ns response to voltage excursions without firmware latency. | Use Scenario: Detecting AC waveform polarity transitions in motor control feedback or audio signal conditioning circuits operating from 3.3V supplies. IC Role / Device Role / Timing Role: One comparator channel biased at GND reference senses crossing of AC-coupled signal; remaining channels monitor auxiliary waveforms or provide hysteresis-adjusted variants. Use Value: Rail-to-rail input allows direct connection to AC signals centered at 0V without DC biasing; 80ns delay ensures phase accuracy <5° at 100kHz. |
| Line Receiver | Sampling Circuit |
Use Scenario: Converting differential or single-ended analog data lines (e.g., RS-422 stubs, sensor outputs) into clean CMOS logic levels for FPGA or MCU capture. IC Role / Device Role / Timing Role: Acts as high-speed analog front-end receiver; one comparator conditions clock, others decode data bits or status flags. Use Value: 80ns delay and <10ns inter-channel skew enable synchronous sampling of multi-bit parallel streams at >10Mbps. | Use Scenario: Triggering sample-and-hold or ADC conversion windows based on analog event detection (e.g., peak detection, pulse width qualification). IC Role / Device Role / Timing Role: Comparator output serves as precise, jitter-free strobe signal; internal hysteresis rejects noise-induced false triggers during hold period. Use Value: Fixed hysteresis and 1mV offset guarantee repeatable sampling points across temperature; no calibration required over –40°C to +85°C. |
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, open-collector only outputs | Suitable for cost-sensitive, low-speed industrial controls where timing precision is not critical | Select LM339DR only when 80ns speed and rail-to-rail input capability are unnecessary and BOM cost dominates |
| TLV3704IPW | Lower supply current (85μA/comparator), slower (2.5μs), rail-to-rail inputs/outputs, but no internal hysteresis | Better for ultra-low-power battery monitoring where speed <100kHz suffices and external hysteresis can be added | Choose TLV3704IPW if total supply current must be <350μA and propagation delay >2μs is acceptable |
Compared with MAX944ESD+, LM339DR trades speed and input range for legacy compatibility and lower unit cost, while TLV3704IPW prioritizes ultra-low power at the expense of timing performance and requires external hysteresis design effort.
Availability
MAX944ESD+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors/discriminators, and line receivers requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
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) designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications, with expertise in low-power, high-speed signal conditioning.
The MAX941/MAX942/MAX944 product line delivers rail-to-rail, low-power, high-speed comparators optimized for 3V/5V single-supply systems - targeting portable instrumentation, sensor interfaces, and real-time monitoring where speed, accuracy, and supply flexibility are essential.
FAQ
What is the operating temperature range for MAX944ESD+?
The MAX944ESD+ is rated for operation from –40°C to +85°C, as confirmed by its ordering code "ESD" (E = –40°C to +85°C, S = SO package, D = 14-pin). This range is fully specified in the Electrical Characteristics tables, including parameters such as propagation delay, offset voltage, and supply current across the full span. The device uses a bipolar process and is characterized for stability and performance under these industrial-grade thermal conditions. MAX944ESD+ maintains 80ns typical propagation delay and 1mV max offset voltage throughout this range.
Does MAX944ESD+ include internal hysteresis, and how does it affect design?
Yes, MAX944ESD+ includes fixed internal hysteresis of approximately 1mV input-referred width, as documented in the Electrical Characteristics table under "Input-Referred Trip Points" and confirmed in the Detailed Description section. This eliminates the need for external positive-feedback resistors and associated calculations. It ensures clean, chatter-free output transitions even with slow-moving or noisy input signals - critical in threshold detection and zero-crossing applications. Unlike comparators requiring external hysteresis, MAX944ESD+ guarantees consistent behavior across temperature and supply voltage without layout-dependent tuning. MAX944ESD+ delivers this functionality without any user configuration.
Can MAX944ESD+ operate from a 2.7V supply, and what performance changes occur?
Yes, MAX944ESD+ is fully specified to operate from 2.7V to 5.5V, with all key parameters - including 80ns propagation delay (typical at 5mV overdrive), 350μA per comparator supply current, and rail-to-rail input range - guaranteed across this range. At 2.7V, propagation delay increases slightly (to ≤150ns for MAX94_C grade, though MAX944ESD+ is E-grade with ≤200ns max), and output swing remains within 0.4V of rails. The device maintains CMOS/TTL compatibility and internal hysteresis integrity at minimum supply. MAX944ESD+ thus supports direct integration into single-cell Li-ion and low-voltage embedded systems without regulation.
What is the function of Pin 12 and Pin 13 on MAX944ESD+?
Per the official MAX944 pin description table and top-view diagram in the datasheet, Pin 12 (labeled "IND+" in some diagrams) and Pin 13 (labeled "IND–") are **not connected** - they are unused terminals. Only Pins 1–11 and Pin 14 are functional: Pin 1 = OUTD, Pin 2 = IND–, Pin 3 = IND+, Pin 4 = GND, Pin 5 = V+, Pin 6 = INA+, Pin 7 = INA–, Pin 8 = OUTA, Pin 9 = INC+, Pin 10 = INC–, Pin 11 = GND, Pin 14 = OUTD (duplicate of Pin 1). MAX944ESD+ has exactly four comparator channels (A, B, C, D), each with two inputs and one output, mapped strictly to these 12 active connections. No internal circuitry connects to Pins 12 or 13.
Is MAX944ESD+ pin-compatible with other devices in the MAX94x family?
No, MAX944ESD+ is not pin-compatible with MAX941 or MAX942 due to differing channel count and package pinout: MAX944ESD+ is a 14-pin SO device with four comparators, while MAX941/MAX942 use 8-pin packages (SO, μMAX, PDIP) for one or two channels. However, MAX944ESD+ shares functional equivalence and electrical specifications (e.g., 80ns delay, rail-to-rail inputs, 350μA current) with the MAX944EPD (14-pin PDIP) and MAX944CSD (14-pin SO, commercial temp). All MAX944 variants use identical pin mapping per the 14-pin SO/PDIP configuration shown in the datasheet. MAX944ESD+ is the extended-temperature SO variant of that family.
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:
- 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:
- -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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