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Analog Devices Inc./Maxim Integrated MAX944CPD+
- Part No.:
- MAX944CPD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX944CPD+.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
MAX944CPD+ 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 circuits, and battery-powered line receivers.
For engineers reviewing the MAX944CPD+ datasheet, MAX944CPD+ pinout, MAX944CPD+ application, or MAX944CPD+ equivalent, key selection considerations include its 14-pin PDIP package, guaranteed 1mV typical input offset voltage, internal hysteresis for noise immunity, and rail-to-rail output swing within 0.4V of V+ or GND without external pullups.
Technical Context
The MAX944CPD+ implements a bipolar process-based comparator core with fixed internal hysteresis (≈1mV), enabling clean switching on slow-moving or noisy signals without external feedback components. Its input stage tolerates common-mode voltages from –0.3V to (V+ + 0.3V), supporting true rail-to-rail operation beyond supply rails.
The output stage uses a current-driven architecture delivering 400μA sink/source capability, ensuring VOH ≥ V+ – 0.4V and VOL ≤ 0.4V at 400μA load. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns - critical for multi-channel timing alignment 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 (typ) at 5mV overdrive - enables reliable sampling up to ~10MHz system clock edges. |
| Input Offset Voltage | 1mV (typ) at +25°C - ensures accurate threshold detection down to millivolt-level signal differentials. |
| Rail-to-Rail Input Range | –0.3V to (V+ + 0.3V) - allows input signals to exceed supply rails, simplifying sensor interfacing. |
| Output Swing | VOL ≤ 0.4V / VOH ≥ V+ – 0.4V at 400μA - directly drives CMOS/TTL logic without pullup resistors. |
| Supply Current per Comparator | 350μA (typ) at 3V - enables ultra-low-power operation in portable and battery-backed systems. |
| Internal Hysteresis | Fixed ~1mV - eliminates need for external hysteresis resistors and associated layout complexity. |
Pinout & Package
MAX944CPD+ is housed in a 14-pin plastic DIP (PDIP) package with 0.300" wide body, compatible with standard through-hole PCB assembly and socketing. Pin pitch is 0.100", and thermal resistance θJA is 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A output - open-drain compatible, sinks up to 4mA, swings rail-to-rail. |
| 2 | INA− | Inverting input for Comparator A - accepts common-mode voltages beyond V+ and GND. |
| 3 | INA+ | Noninverting input for Comparator A - matched to INA− for low offset and drift. |
| 4 | V+ | Positive supply pin - must be ≤ +6.5V; decoupling capacitor required adjacent to pin. |
| 5 | INB+ | Noninverting input for Comparator B - electrically isolated from other channels. |
| 6 | INB− | Inverting input for Comparator B - shares same input stage architecture as INA±. |
| 7 | OUTB | Comparator B output - identical electrical behavior to OUTA. |
| 8 | GND | Ground reference - low-impedance return path essential for noise immunity and timing accuracy. |
| 9 | INC− | Inverting input for Comparator C - supports independent threshold setting per channel. |
| 10 | INC+ | Noninverting input for Comparator C - enables configurable hysteresis polarity. |
| 11 | OUTC | Comparator C output - maintains <10ns skew vs. OUTA/OUTB for synchronized decisions. |
| 12 | IND+ | Noninverting input for Comparator D - fully independent, no crosstalk with other inputs. |
| 13 | IND− | Inverting input for Comparator D - supports differential sensing with matched input impedance. |
| 14 | OUTD | Comparator D output - completes quad functionality; all four outputs are CMOS/TTL-compatible. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends –0.3V to (V+ + 0.3V), enabling direct connection to sensors or transducers operating outside supply rails. |
| 80ns propagation delay | Guaranteed at 5mV overdrive, supporting precise edge detection in high-speed sampling and timing-critical control loops. |
| 350μA per comparator supply current | Enables 4-channel comparison in battery-powered devices with sub-1.4mA total quiescent draw at 3V. |
| Internal 1mV hysteresis | Eliminates external resistor networks and layout sensitivity while preventing chatter on slow or noisy input transitions. |
| CMOS/TTL-compatible outputs | VOH/VOL meet 3.3V/5V logic thresholds without pullups, reducing BOM count and board space in mixed-voltage systems. |
| Short-circuit tolerant I/O | All pins withstand continuous short to V+ or GND - improves robustness in industrial and test equipment environments. |
Applications
| Threshold Detectors | Zero-Crossing Detectors |
|---|---|
|
Use Scenario: Monitoring analog sensor outputs (e.g., temperature, pressure) against programmable trip points in data acquisition systems. IC Role / Device Role / Timing Role: Quad comparator providing simultaneous high/low band detection and fault flag generation. Use Value: 1mV offset and internal hysteresis ensure stable decision boundaries even with microvolt-level sensor noise. |
Use Scenario: Detecting AC waveform polarity reversals in motor control, power metering, or audio signal processing. IC Role / Device Role / Timing Role: Precision zero-crossing comparator with rail-to-rail inputs accepting ±10V signals via external scaling. Use Value: 80ns delay and <10ns inter-channel skew enable sub-microsecond timing resolution across all four phases. |
| Battery-Powered Line Receivers | Sampling Circuits |
|
Use Scenario: Converting noisy, attenuated RS-422/RS-485 differential signals into clean single-ended logic in portable instrumentation. IC Role / Device Role / Timing Role: High-speed comparator acting as front-end receiver with hysteresis filtering line-induced jitter. Use Value: 350μA per channel and 2.7V minimum operation extend battery life while maintaining >10Mbps signal integrity. |
Use Scenario: Clocking sample-and-hold stages or ADC trigger inputs in digitizers and oscilloscopes. IC Role / Device Role / Timing Role: Synchronized quad comparator generating strobe pulses aligned to analog signal edges. Use Value: Matched propagation delays (<10ns skew) ensure deterministic timing across multiple sampling paths. |
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 |
|---|---|---|---|
| LM339N | Slower (1.3μs delay), higher supply current (500μA/comparator), no rail-to-rail inputs, no internal hysteresis. | Suitable only for low-speed, non-critical threshold detection where precision and speed are secondary. | Select LM339N only when cost is primary constraint and 80ns timing or rail-to-rail operation is unnecessary. |
| TLV3502CDR | Faster (4.5ns delay), lower supply current (85μA), rail-to-rail inputs/outputs, but rated only to 5.5V and lacks internal hysteresis. | Preferred for ultra-high-speed sampling but requires external hysteresis network for noise-prone environments. | Choose TLV3502CDR when nanosecond response is mandatory and board area permits external hysteresis resistors. |
Compared with LM339N and TLV3502CDR, the MAX944CPD+ uniquely balances 80ns speed, rail-to-rail operation, integrated 1mV hysteresis, and 350μA efficiency - making it optimal for portable, precision thresholding where layout simplicity and supply flexibility matter.
Availability
MAX944CPD+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial threshold monitoring, and high-fidelity signal sampling requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for MAX944CPD+ 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 consumer applications.
The MAX941/MAX942/MAX944 family was designed specifically for low-voltage, high-speed comparator applications in portable and 3V/5V systems - emphasizing rail-to-rail operation, minimal power, and integration of hysteresis and logic-compatible outputs.
FAQ
What is the operating temperature range for MAX944CPD+?
The MAX944CPD+ is specified for commercial temperature operation from 0°C to +70°C. This range is confirmed in the Ordering Information table and applies to the PDIP package variant. It is not rated for extended industrial (–40°C to +85°C) or automotive temperatures - those require MAX944EPD or MAX944ESD variants.
Does MAX944CPD+ include internal hysteresis, and how does it affect design?
Yes, the MAX944CPD+ features fixed internal hysteresis of approximately 1mV, eliminating the need for external resistor networks. This hysteresis prevents output oscillation on slow-moving or noisy inputs - a key advantage in threshold detectors and zero-crossing applications where external components would increase cost and board area.
Can MAX944CPD+ drive TTL and CMOS logic directly without pull-up resistors?
Yes, the MAX944CPD+ outputs swing to within 0.4V of V+ (VOH ≥ V+ – 0.4V) and to 0.4V above GND (VOL ≤ 0.4V) at 400μA load, meeting standard TTL and CMOS logic thresholds for both 3.3V and 5V supplies. No external pull-up resistors are required for compatibility.
What is the maximum supply voltage rating for MAX944CPD+?
The absolute maximum supply voltage for MAX944CPD+ is +6.5V referenced to GND, as stated in the Absolute Maximum Ratings table. However, functional operation is guaranteed only from 2.7V to 5.5V - exceeding 5.5V may cause parametric degradation or latch-up, even if below the 6.5V absolute limit.
How does the pinout of MAX944CPD+ differ from the dual MAX942 or single MAX941 packages?
The MAX944CPD+ uses a dedicated 14-pin PDIP layout with independent inputs and outputs for all four comparators (OUTA–OUTD, INA±–IND±, V+, GND). Unlike the 8-pin MAX941/MAX942, it does not share pins or include SHDN/LATCH functions - those are exclusive to MAX941. The 14-pin arrangement avoids signal crosstalk and supports full parallel operation.
MAX944CPD+ 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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 14-PDIP
MAX944CPD+ FAQ
1.How can I place an order for MAX944CPD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX944CPD+ 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 MAX944CPD+ reliable?
The price and inventory of MAX944CPD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX944CPD+ is usually 5 days.
3.What payment methods are accepted for MAX944CPD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX944CPD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX944CPD+?
MAX944CPD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX944CPD+ 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 MAX944CPD+?
For technical support, including MAX944CPD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX944CPD+ requirements.
6.How does Aetrix verify that MAX944CPD+ is sourced from the original manufacturer or authorized distributors?
All MAX944CPD+ 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 MAX944CPD+ meets industry standards.
7.What is the process for return or replacement of MAX944CPD+?
All MAX944CPD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX944CPD+, 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 MAX944CPD+ part is unused and in its original packaging.
Return procedure for MAX944CPD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX944CPD+ Tags
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