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Analog Devices Inc./Maxim Integrated MAX941CPA
- Part No.:
- MAX941CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX941CPA.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,287
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Product details
Overview
The MAX941CPA from Maxim Integrated is a single high-speed comparator optimized for 3V/5V single-supply systems, featuring rail-to-rail inputs, 80ns propagation delay (5mV overdrive), 350μA supply current per comparator, and internal latch/shutdown functions. 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 MAX941CPA datasheet, MAX941CPA pinout, MAX941CPA application, or MAX941CPA equivalent, key selection considerations include its latch-enable capability, shutdown mode (60μA standby), rail-to-rail input range extending beyond supply rails, and compatibility with low-voltage portable designs requiring clean switching without external hysteresis components.
Technical Context
The MAX941CPA implements a bipolar process comparator core with internal hysteresis (1mV typical input-referred width) to prevent oscillation during slow input transitions. Its input stage includes back-to-back diodes and 4.1kΩ series resistors enabling common-mode voltage operation from –0.3V to (V+ + 0.3V).
The output stage uses a current-driven architecture delivering VOH = V+ – 0.2V (at 400μA) and VOL = 0.2V (at 400μA), ensuring TTL/CMOS compatibility without pull-up resistors. LATCH and SHDN pins are high-impedance CMOS inputs with VIH = V+/2 + 0.4V and VIL = V+/2 – 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports both 3V and 5V systems with margin for brownout tolerance |
| Propagation Delay | 80ns at 5mV overdrive - enables high-speed sampling and zero-crossing detection up to ~10MHz |
| Input Offset Voltage | 1mV (typ), 3mV (max) - ensures accurate threshold discrimination in precision detector circuits |
| Rail-to-Rail Input Range | –0.2V to (V+ + 0.2V) - allows input signals below GND or above V+ without damage or inversion |
| Supply Current | 380μA (typ at 3V), 430μA (typ at 5V) - enables ultra-low-power operation in battery-powered systems |
| Output Swing | VOL = 0.2V (400μA sink), VOH = V+ – 0.2V (400μA source) - guarantees direct interface with 3.3V/5V logic families |
| Shutdown Current | 12μA (min), 60μA (max) - reduces system power during idle periods while retaining fast wake-up |
Pinout & Package
MAX941CPA is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, suitable for through-hole prototyping and industrial PCBs. Pin spacing is 0.1 inch, and thermal resistance is 9.09mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection - must be left unconnected or tied to GND for mechanical stability |
| 2 | OUT | Open-drain compatible CMOS/TTL output - sinks current when low, high-impedance when latched or in shutdown |
| 3 | GND | Analog/digital ground reference - requires low-inductance connection to PCB ground plane |
| 4 | LATCH | High-impedance CMOS control - transparent mode when high, stores output state when pulled low |
| 5 | SHDN | High-impedance CMOS enable - comparator active when high, enters 60μA shutdown when low |
| 6 | IN− | Inverting input - accepts rail-to-rail analog signals; protected by internal diode clamp network |
| 7 | IN+ | Noninverting input - same protection and voltage range as IN−; differential input voltage limited to ±2.2V |
| 8 | V+ | Positive supply - must be bypassed with 0.1μF ceramic capacitor placed within 5mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Internal Hysteresis | 1mV input-referred width eliminates need for external feedback resistors in noise-prone environments |
| Latch Function | Asynchronous storage of comparison result via dedicated LATCH pin - enables event capture without microcontroller intervention |
| Shutdown Mode | Reduces supply current to ≤60μA while placing output in high-impedance state - ideal for duty-cycled sensor monitoring |
| Rail-to-Rail Inputs | Operates with inputs from –0.2V to V+ + 0.2V - supports ground-referenced and overvoltage-tolerant signal conditioning |
| CMOS/TTL-Compatible Outputs | Drives standard logic families directly without pull-up resistors - simplifies interface design and reduces BOM count |
Applications
| Battery-Powered Threshold Detector | Zero-Crossing Detector |
|---|---|
|
Use Scenario: Monitoring battery voltage against programmable thresholds to trigger low-battery alerts in portable medical devices. IC Role / Device Role / Timing Role: Single comparator comparing DAC-adjusted reference against battery rail; latch holds alert state until serviced. Use Value: 350μA quiescent current extends runtime; rail-to-rail input accommodates full battery discharge curve (0.9V–4.2V). |
Use Scenario: Detecting AC line zero crossings in smart energy meters for synchronized sampling and phase measurement. IC Role / Device Role / Timing Role: High-speed comparator with hysteresis rejecting noise near zero crossing; 80ns delay ensures timing accuracy within 1% of 50Hz cycle. Use Value: Internal hysteresis prevents chatter; output swing to 0.2V/4.8V (at 5V) directly drives MCU GPIO with no level-shifting. |
| 3.3V Digital-Controlled Comparator | Line Receiver for Industrial Bus |
|
Use Scenario: Digitally adjustable threshold detection using SPI DAC output as reference in factory automation I/O modules. IC Role / Device Role / Timing Role: MAX941CPA compares analog sensor output against DAC-generated reference; shutdown mode conserves power between readings. Use Value: 1mV offset ensures <10mV total error across temperature; shutdown current ≤60μA enables 100ms sampling intervals with minimal average power. |
Use Scenario: Converting differential RS-485 or CAN bus signals to single-ended logic levels in gateway controllers. IC Role / Device Role / Timing Role: Comparator receiving conditioned bus signal on IN+ and fixed reference on IN−; latch captures transient faults for diagnostic logging. Use Value: Input common-mode range extends beyond rails allows direct interface with biased bus receivers; latch function captures short-duration glitches missed by polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311N | No rail-to-rail inputs; requires dual supply or level-shifting; 200ns propagation delay; no latch/shutdown | Suitable only for legacy 5V designs with ample headroom; lacks low-voltage operation and power management | Select LM311N only if redesigning existing 5V-only systems where cost is primary constraint and 80ns speed is unnecessary |
| TLV3501CD | Rail-to-rail inputs; 4.5ns propagation delay; 2.7–5.5V supply; no latch/shutdown; higher 1.5mA supply current | Better for ultra-high-speed sampling but consumes >4× more power; incompatible with battery life-critical applications | Choose TLV3501CD when sub-10ns response is mandatory and continuous operation justifies higher current draw |
Compared with LM311N and TLV3501CD, the MAX941CPA uniquely balances 80ns speed, 350μA supply current, rail-to-rail inputs, and integrated power-control features-making it optimal for portable, low-power, yet responsive threshold detection where latch retention and shutdown efficiency are required.
Availability
MAX941CPA is available at Aetrix Electronics and suitable for battery-powered systems, 3V/5V industrial controls, and precision threshold detectors requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for MAX941CPA 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 precision analog, mixed-signal, and high-performance power management ICs for industrial, communications, and consumer applications.
The MAX941CPA belongs to Maxim's high-speed comparator family designed specifically for low-voltage, low-power, rail-to-rail single-supply operation in portable and energy-conscious systems.
FAQ
What is the operating temperature range for the MAX941CPA?
The MAX941CPA is specified for operation from 0°C to +70°C. This commercial-grade temperature range makes it suitable for indoor consumer electronics, office equipment, and non-automotive industrial applications where ambient conditions remain within this envelope. The device's electrical characteristics-including propagation delay, offset voltage, and supply current-are guaranteed across this full range.
Does the MAX941CPA require external pull-up resistors on its output?
No, the MAX941CPA does not require external pull-up resistors. Its output stage is designed to drive to within 0.2V of GND and V+ − 0.2V under 400μA load, providing full CMOS/TTL-compatible voltage levels directly. This rail-swing capability eliminates external components and simplifies interface design, especially in space-constrained or high-density layouts where the MAX941CPA is deployed.
How does the internal latch function work in the MAX941CPA?
In the MAX941CPA, the LATCH pin controls asynchronous data capture: when LATCH is high, the output follows the comparator decision in real time (transparent mode); when LATCH is pulled low, the current output state is held indefinitely-even if input conditions change. This feature enables reliable event capture in noisy environments or for interfacing with slower processors that cannot continuously poll the MAX941CPA output.
Can the MAX941CPA operate from a 2.7V supply?
Yes, the MAX941CPA is fully specified to operate from 2.7V to 5.5V. At 2.7V, it maintains 80ns propagation delay (5mV overdrive), 380μA typical supply current, and rail-to-rail input operation down to –0.2V. This makes the MAX941CPA ideal for single-cell Li-ion (2.7–4.2V) or triple-AA (3.0–4.5V) powered systems where supply voltage varies significantly during discharge.
What protection features does the MAX941CPA include on its input pins?
The MAX941CPA includes robust input protection: back-to-back diodes between IN+ and IN− limit differential voltage to ~1.4V, and two 4.1kΩ series resistors limit fault current. This allows continuous short-circuit tolerance to either supply rail and supports common-mode voltages from –0.3V to (V+ + 0.3V). These features ensure reliability in harsh environments where the MAX941CPA may encounter ESD transients or miswired signals.
MAX941CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Latch, Shutdown
- Number of Elements:
- 1
- 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):
- 700µA
- 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
- :
- 8-PDIP
MAX941CPA FAQ
1.How can I place an order for MAX941CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX941CPA 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 MAX941CPA reliable?
The price and inventory of MAX941CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX941CPA is usually 5 days.
3.What payment methods are accepted for MAX941CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX941CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX941CPA?
MAX941CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX941CPA 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 MAX941CPA?
For technical support, including MAX941CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX941CPA requirements.
6.How does Aetrix verify that MAX941CPA is sourced from the original manufacturer or authorized distributors?
All MAX941CPA 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 MAX941CPA meets industry standards.
7.What is the process for return or replacement of MAX941CPA?
All MAX941CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX941CPA, 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 MAX941CPA part is unused and in its original packaging.
Return procedure for MAX941CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX941CPA Tags
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