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Analog Devices Inc./Maxim Integrated MAX941CSA-T
- Part No.:
- MAX941CSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX941CSA-T.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,075
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Product details
Overview
The MAX941CSA-T 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 MAX941CSA-T datasheet, MAX941CSA-T pinout, MAX941CSA-T application, or MAX941CSA-T equivalent, key selection criteria include latch-enable timing (tS = 20ns, tH = 30ns), shutdown disable time (10ns), rail-to-rail input range (–0.2V to V+ + 0.2V), and output swing within 0.4V of rails without pullups.
Technical Context
The MAX941CSA-T implements a bipolar-input comparator core with fixed internal hysteresis (1mV typical trip-point width), enabling clean switching on slow-moving signals without external components. Its current-driven output stage delivers fast slew rates while reducing static current after transition.
It integrates two digital control pins-SHDN and LATCH-that operate with TTL/CMOS-compatible thresholds (VIH = V+/2 + 0.4V, VIL = V+/2 – 0.4V) and support high-impedance shutdown (<60μA ICC) and transparent/latched output modes. Input protection includes back-to-back diodes and 4.1kΩ series resistors, allowing safe operation with differential inputs up to ±2.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 80ns typical at 5mV overdrive - enables sampling of >10MHz signals with deterministic timing |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into 3.3V and 5V logic domains without level shifting |
| Input Offset Voltage | 1mV max at +25°C - ensures accurate threshold detection down to millivolt-level differentials |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows input signals beyond supply rails, simplifying sensor interface design |
| Output Swing | VOL = 0.4V max at 4mA sink; VOH = V+ – 0.2V min at 400μA source - guarantees CMOS/TTL logic compatibility |
| Supply Current | 350μA per comparator typical at 3V - enables ultra-low-power operation in portable equipment |
| Shutdown Current | 12μA to 60μA - reduces system standby power without external circuitry |
Pinout & Package
MAX941CSA-T is housed in an 8-pin SO (Small Outline) package with exposed pad thermal enhancement, compatible with standard surface-mount reflow processes and IPC-7351B land pattern S8-2.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection - must be left floating or grounded per layout best practice |
| 2 | OUT | Open-drain compatible output - sinks up to 4mA; requires no pullup for TTL/CMOS interfacing |
| 3 | GND | Analog/digital ground reference - must connect to low-impedance ground plane for noise immunity |
| 4 | LATCH | High-impedance digital control - latches output when low; transparent when high (tLPW ≥ 50ns) |
| 5 | SHDN | High-impedance enable input - disables comparator and forces high-Z output when low |
| 6 | IN– | Inverting input - accepts rail-to-rail common-mode voltage; protected against ±2.2V differential stress |
| 7 | IN+ | Noninverting input - identical protection and range as IN–; differential pair defines trip point |
| 8 | V+ | Positive supply rail - supports 2.7V–5.5V; decoupling capacitor required within 2mm |
Key Features
| Feature | Design Value |
|---|---|
| Internal latch with setup/hold timing | tS = 20ns, tH = 30ns - enables synchronous capture of analog events in digital control loops |
| Shutdown mode with fast wake-up | Disable time = 10ns - allows dynamic power gating in burst-mode sensing applications |
| Rail-to-rail input with extended common-mode range | Operates with inputs 0.2V beyond V+ or GND - eliminates need for external level-shifting circuitry |
| Fixed internal hysteresis | 1mV typical hysteresis width - prevents oscillation on noisy or slowly varying inputs without external resistors |
| CMOS/TTL-compatible outputs | VOH/VOL meet both logic families across full temperature range - simplifies interface to microcontrollers and FPGAs |
Applications
| Battery-Powered Threshold Detector | 3.3V Digital Line Receiver |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.2V. IC Role / Device Role / Timing Role: Single comparator compares scaled battery voltage against precision reference; latch holds result for MCU polling. Use Value: 1mV offset and rail-to-rail input allow direct measurement without op-amp buffering; 350μA quiescent current extends battery life. |
Use Scenario: Converting RS-422 differential line signals to single-ended 3.3V logic for FPGA input. IC Role / Device Role / Timing Role: High-speed comparator acts as line receiver with hysteresis to reject EMI-induced glitches. Use Value: 80ns propagation delay supports >10Mbps data rates; output swing within 0.4V of rails ensures reliable logic-level translation. |
| Zero-Crossing Detector for AC Sensing | Sampling Circuit Trigger Generator |
|
Use Scenario: Detecting AC mains zero-crossing in smart energy meters using transformer-coupled input. IC Role / Device Role / Timing Role: Comparator with rail-to-rail input senses near-zero differential voltage; internal hysteresis suppresses noise at crossing point. Use Value: Input common-mode range extending below GND allows direct connection to center-tapped transformer secondaries without biasing. |
Use Scenario: Generating precise sample-enable pulses synchronized to analog signal peaks in data acquisition systems. IC Role / Device Role / Timing Role: Latch-enabled comparator captures peak-hold voltage and generates strobe pulse for ADC conversion start. Use Value: LATCH pin timing parameters (tLPD = 70ns, tLPW = 50ns) ensure sub-100ns jitter in trigger generation, critical for 12-bit+ sampling accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Slower (200ns propagation delay), higher supply current (5.5mA), no latch/shutdown, open-collector only | Requires external pullup and hysteresis resistors; unsuitable for low-power or synchronized capture use cases | Choose LM311DR only for cost-sensitive industrial designs where speed and power are secondary |
| TLV3501CDR | Faster (4.5ns delay), rail-to-rail output, but no latch/shutdown; 2.7V–5.5V supply; 1.3mA supply current | Lacks integrated control logic - demands external flip-flop and enable circuitry for latched operation | Prefer TLV3501CDR when nanosecond response is mandatory and system-level latch logic already exists |
Compared with LM311DR and TLV3501CDR, the MAX941CSA-T uniquely integrates latch and shutdown in a single SO-8 package while maintaining 80ns speed and 350μA quiescent current - eliminating board space and BOM count for discrete control logic in portable and battery-operated systems.
Availability
MAX941CSA-T is available at Aetrix Electronics and suitable for battery-powered systems, 3.3V/5V threshold detectors, and zero-crossing detection requiring stable component supply across industrial temperature ranges (0°C to +70°C).
Supply support for MAX941CSA-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX941CSA-T belongs to Maxim's high-speed comparator product line, designed specifically for low-voltage, low-power, rail-to-rail sensing in portable and energy-conscious systems where timing precision and integration reduce system complexity.
FAQ
What is the operating temperature range for the MAX941CSA-T?
The MAX941CSA-T is specified for 0°C to +70°C ambient operation, matching the "C" grade in Maxim's ordering nomenclature. Its electrical characteristics-including propagation delay, offset voltage, and supply current-are guaranteed across this range. The SO package's thermal performance supports continuous operation at full rated load within this envelope, with derating applied above +70°C per the 5.88mW/°C specification.
Does the MAX941CSA-T require external pullup resistors on its output?
No, the MAX941CSA-T does not require external pullup resistors. Its output stage actively drives high to within 0.2V of V+ and low to 0.4V above GND at 400μA, meeting CMOS and TTL logic thresholds directly. This rail-to-rail output capability eliminates external components and reduces board area, especially critical in space-constrained portable designs using the MAX941CSA-T.
How does the internal hysteresis of the MAX941CSA-T improve noise immunity?
The MAX941CSA-T features fixed internal hysteresis (~1mV typical width between upper and lower trip points), which prevents output oscillation when input signals hover near the threshold. Unlike comparators requiring external hysteresis resistors, this built-in feature ensures consistent noise rejection across temperature and supply voltage without design iteration-critical for reliable zero-crossing or threshold detection in electrically noisy environments where the MAX941CSA-T is deployed.
Can the LATCH and SHDN pins of the MAX941CSA-T be driven by standard 3.3V GPIOs?
Yes, both LATCH and SHDN pins accept standard 3.3V logic levels. Their input thresholds are VIH = V+/2 + 0.4V and VIL = V+/2 – 0.4V, so at V+ = 3.3V, VIH = 2.05V and VIL = 1.25V-well within 3.3V CMOS output specs. With <10μA input current, they impose negligible load on microcontroller GPIOs, making the MAX941CSA-T straightforward to integrate into FPGA- or MCU-based control systems.
What is the maximum capacitive load the MAX941CSA-T output can drive while maintaining 80ns propagation delay?
The MAX941CSA-T maintains its 80ns typical propagation delay with ≤15pF total capacitive load, as tested in the datasheet (RS = 10Ω, CLOAD = 15pF, VOD = 5mV). Load capacitance beyond 15pF increases delay nonlinearly-e.g., 100pF raises tPD to ~160ns. For applications requiring fast edges, keep trace + scope/probe + downstream input capacitance under 15pF, or buffer the MAX941CSA-T output when driving heavier loads.
MAX941CSA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- :
- 8-SOIC
MAX941CSA-T FAQ
1.How can I place an order for MAX941CSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX941CSA-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 MAX941CSA-T reliable?
The price and inventory of MAX941CSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX941CSA-T is usually 5 days.
3.What payment methods are accepted for MAX941CSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX941CSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX941CSA-T?
MAX941CSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX941CSA-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 MAX941CSA-T?
For technical support, including MAX941CSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX941CSA-T requirements.
6.How does Aetrix verify that MAX941CSA-T is sourced from the original manufacturer or authorized distributors?
All MAX941CSA-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 MAX941CSA-T meets industry standards.
7.What is the process for return or replacement of MAX941CSA-T?
All MAX941CSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX941CSA-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 MAX941CSA-T part is unused and in its original packaging.
Return procedure for MAX941CSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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