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Analog Devices Inc./Maxim Integrated MAX944EPD+
- Part No.:
- MAX944EPD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX944EPD+.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,397
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Product details
Overview
The MAX944EPD+ 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 internal hysteresis - enabling clean switching in battery-powered threshold detection and line receiver applications.
For engineers reviewing the MAX944EPD+ datasheet, MAX944EPD+ pinout, MAX944EPD+ application, or MAX944EPD+ equivalent, key selection considerations include its 14-pin PDIP package, -40°C to +85°C operating range, rail-to-rail input voltage range extending beyond both rails, and CMOS/TTL-compatible push-pull outputs without external pullups.
Technical Context
The MAX944EPD+ implements a bipolar process-based comparator core with fixed internal hysteresis (1mV typical input-referred trip width), eliminating external hysteresis resistors. Its input stage includes back-to-back diodes and 4.1kΩ series resistors, enabling common-mode operation from -0.2V to V+ + 0.2V and tolerance of continuous short-circuit faults to either rail.
The output stage uses a current-driven architecture delivering VOH = V+ − 0.2V (at 400μA) and VOL = 0.2V (at 400μA), ensuring direct interface with CMOS and TTL logic. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns - critical for synchronized multi-channel sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.5V - supports direct integration into 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 (max, TA = +25°C) - ensures accurate threshold detection at low differential voltages. |
| Rail-to-Rail Input Range | -0.2V to V+ + 0.2V - allows input signals to exceed supply rails, simplifying sensor interfacing. |
| Supply Current per Comparator | 350μA (typical, V+ = 3V) - enables four-channel operation at <1.4mA total, ideal for portable systems. |
| Output Swing | VOL = 0.2V / VOH = V+ − 0.2V (at 400μA) - guarantees TTL/CMOS logic compatibility without pull-up resistors. |
| Input Bias Current | 150–400nA - minimizes loading on high-impedance sources like photodiode or thermistor networks. |
Pinout & Package
MAX944EPD+ is housed in a 14-pin plastic DIP (PDIP) package with 0.300" wide body, RoHS-compliant lead finish, and through-hole mounting. Pin pitch is 0.100", compatible with standard 0.1" grid PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A output - push-pull, CMOS/TTL-compatible, sinks up to 4mA, sources up to 400μA. |
| 2 | INA− | Inverting input for Comparator A - part of rail-to-rail input pair, tolerant of −0.3V to V+ + 0.3V. |
| 3 | INA+ | Noninverting input for Comparator A - matched to INA−; differential input voltage range ±0.3V. |
| 4 | V+ | Positive supply - accepts 2.7V to 5.5V; absolute max 6.5V; requires local 0.1μF ceramic decoupling. |
| 5 | INB+ | Noninverting input for Comparator B - electrically identical to INA+, supports independent channel use. |
| 6 | INB− | Inverting input for Comparator B - paired with INB+, shares same input stage characteristics as A channel. |
| 7 | OUTB | Comparator B output - fully independent, no crosstalk guaranteed; matches OUTA electrical specs. |
| 8 | GND | Ground reference - must connect to low-inductance ground plane; all inputs/outputs referenced to this node. |
| 9 | INC− | Inverting input for Comparator C - third channel, identical input structure and voltage range as A/B. |
| 10 | INC+ | Noninverting input for Comparator C - supports three independent comparators on shared supply. |
| 11 | OUTC | Comparator C output - push-pull, same drive strength and logic thresholds as OUTA/OUTB. |
| 12 | IND+ | Noninverting input for Comparator D - fourth channel; completes quad configuration for parallel sensing. |
| 13 | IND− | Inverting input for Comparator D - full rail-to-rail capability; enables four independent threshold decisions. |
| 14 | OUTD | Comparator D output - final channel output; matches timing (80ns tPD) and voltage swing of others. |
Key Features
| Feature | Design Value |
|---|---|
| Internal hysteresis | Fixed 1mV input-referred hysteresis eliminates need for external resistor networks and design calculations. |
| Rail-to-rail inputs | Operates with inputs from −0.2V to V+ + 0.2V, enabling direct connection to sensors exceeding supply rails. |
| Quad independent channels | Four fully isolated comparators share supply and ground but exhibit ≤10ns propagation skew for synchronized response. |
| Low-power operation | 350μA per comparator at 3V enables four-channel detection at <1.4mA - extends battery life in portable designs. |
| CMOS/TTL-compatible outputs | Push-pull outputs drive logic directly without pull-ups, reducing BOM count and board space in digital interface circuits. |
| Short-circuit fault tolerance | All I/O pins withstand continuous short to V+ or GND, enhancing reliability in industrial and automotive environments. |
Applications
| Battery-Powered Threshold Detection | Industrial Line Receiver |
|---|---|
|
Use Scenario: Monitoring battery voltage against multiple thresholds (e.g., 3.3V warn, 3.0V critical, 2.7V shutdown) in handheld medical devices. IC Role / Device Role / Timing Role: Quad comparator performing simultaneous analog voltage comparisons with 80ns decision latency. Use Value: Single MAX944EPD+ replaces four discrete comparators, cutting PCB area by >60% and eliminating four sets of hysteresis resistors. |
Use Scenario: Converting noisy RS-422/RS-485 differential line signals into clean single-ended logic levels in PLC backplanes. IC Role / Device Role / Timing Role: Comparator acting as differential line receiver with rail-to-rail input tolerance for common-mode noise rejection. Use Value: Input common-mode range extending beyond rails allows robust reception even with ground offset up to ±0.2V. |
| Zero-Crossing Detector for AC Sensing | Sampling Circuit Trigger Generator |
|
Use Scenario: Detecting AC mains zero-crossing points in smart energy meters using transformer-coupled inputs. IC Role / Device Role / Timing Role: Comparator configured with resistive divider biasing to detect polarity reversal of sine wave input. Use Value: Internal hysteresis prevents chatter during slow zero-crossing transitions, yielding jitter-free timing pulses. |
Use Scenario: Generating precise sample-enable pulses for ADCs in data acquisition systems triggered by analog event thresholds. IC Role / Device Role / Timing Role: Comparator providing sub-100ns edge-triggered strobe signal synchronized to analog input crossing. Use Value: 80ns propagation delay and ≤10ns channel skew ensure deterministic, repeatable sampling timing across multiple ADC channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339N | Slower (1.3μs propagation delay), higher supply current (500μA/comparator), no rail-to-rail inputs, open-collector outputs requiring pull-ups. | Acceptable for low-speed, cost-sensitive industrial controls where speed and rail-to-rail operation are not required. | Select LM339N only when 80ns timing is unnecessary and board space permits external pull-up resistors. |
| TLV3704IPW | Faster (65ns), lower power (85μA/comparator), rail-to-rail inputs/outputs, but rated only to +70°C and supplied in 14-pin TSSOP (not PDIP). | Suitable for commercial-grade, space-constrained designs needing ultra-low power, but not for extended temperature or through-hole assembly. | Choose TLV3704IPW for battery-powered consumer electronics with tight thermal budgets; avoid for industrial +85°C or legacy PDIP layouts. |
Compared with LM339N, MAX944EPD+ delivers 16× faster response and eliminates pull-up components; versus TLV3704IPW, it offers guaranteed operation to +85°C in through-hole PDIP - critical for ruggedized industrial control cards requiring manual rework and thermal cycling resilience.
Availability
MAX944EPD+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial line receivers, zero-crossing detectors, and multi-threshold sampling circuits requiring stable component supply across extended temperature ranges.
Supply support for MAX944EPD+ 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, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX94x family was designed specifically for high-speed, low-power, single-supply comparator applications in portable and 3V/5V embedded systems - prioritizing rail-to-rail input operation, minimal external components, and robust fault tolerance.
FAQ
What is the operating temperature range of the MAX944EPD+?
The MAX944EPD+ is specified for operation from -40°C to +85°C. This extended industrial temperature range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The 'E' grade suffix explicitly denotes this range, making MAX944EPD+ suitable for deployment in harsh environments such as factory automation controllers and outdoor metering equipment where ambient temperatures fluctuate widely.
Does the MAX944EPD+ require external pull-up resistors on its outputs?
No, the MAX944EPD+ does not require external pull-up resistors. Its outputs are push-pull (totem-pole) and capable of sourcing up to 400μA and sinking up to 4mA while driving to within 0.2V of V+ and 0.2V of GND respectively. This CMOS/TTL-compatible output structure is explicitly stated in the General Description and Electrical Characteristics tables, enabling direct interface with digital logic without additional components.
How many independent comparators does the MAX944EPD+ contain?
The MAX944EPD+ contains four fully independent high-speed comparators (labeled A, B, C, and D). This is confirmed by the Pin Configurations diagram showing 14 pins allocated to four OUTx, four IN+x, four IN−x, plus V+ and GND. The device ordering code 'MAX944' itself denotes the quad variant within the MAX941/MAX942/MAX944 family, and all electrical specifications (e.g., supply current per comparator) are normalized per channel.
What is the maximum supply voltage rating for the MAX944EPD+?
The absolute maximum supply voltage for the MAX944EPD+ is +6.5V, as stated in the Absolute Maximum Ratings table. However, the recommended operating range is +2.7V to +5.5V, and all guaranteed performance specifications (propagation delay, offset voltage, supply current) apply only within that range. Exceeding +5.5V may cause parametric degradation or damage, even if below the 6.5V absolute limit.
Is the MAX944EPD+ pin-compatible with other packages in the MAX944 family?
Yes, the MAX944EPD+ (14-pin PDIP) shares identical pinout and functionality with the MAX944ESD (14-pin SO), as confirmed by the Pin Configurations diagram and Ordering Information table. Both packages route OUTA, INA−, INA+, V+, INB+, INB−, OUTB, GND, INC−, INC+, OUTC, IND+, IND−, and OUTD to the same pin numbers. This allows drop-in replacement between through-hole and surface-mount versions without PCB redesign.
MAX944EPD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- :
- 14-PDIP
MAX944EPD+ FAQ
1.How can I place an order for MAX944EPD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX944EPD+ 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 MAX944EPD+ reliable?
The price and inventory of MAX944EPD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX944EPD+ is usually 5 days.
3.What payment methods are accepted for MAX944EPD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX944EPD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX944EPD+?
MAX944EPD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX944EPD+ 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 MAX944EPD+?
For technical support, including MAX944EPD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX944EPD+ requirements.
6.How does Aetrix verify that MAX944EPD+ is sourced from the original manufacturer or authorized distributors?
All MAX944EPD+ 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 MAX944EPD+ meets industry standards.
7.What is the process for return or replacement of MAX944EPD+?
All MAX944EPD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX944EPD+, 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 MAX944EPD+ part is unused and in its original packaging.
Return procedure for MAX944EPD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX944EPD+ Tags
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