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Analog Devices Inc./Maxim Integrated MAX942CSA
- Part No.:
- MAX942CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX942CSA.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,658
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Product details
Overview
MAX942CSA from Maxim Integrated is a dual 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 push-pull outputs. It operates from 2.7V to 5.5V and is used in battery-powered threshold detection and line receiver circuits.
For engineers reviewing the MAX942CSA datasheet, MAX942CSA pinout, MAX942CSA application, or MAX942CSA equivalent, key selection considerations include input common-mode range beyond rails, internal hysteresis for noise immunity, output swing within 0.4V of V+ and GND, and SO-8 package compatibility with standard surface-mount assembly processes.
Technical Context
The MAX942CSA implements a bipolar-input, current-driven output stage enabling fast transitions without external pull-ups. Its internal hysteresis eliminates need for external feedback resistors and ensures clean switching with slow-moving or noisy inputs.
It supports rail-to-rail common-mode input voltage from –0.2V to (V+ + 0.2V), tolerates continuous short-circuit faults to either rail, and delivers matched propagation delays (tPD+ and tPD–) with ≤10ns skew between channels - critical for dual-channel timing integrity in sampling and zero-crossing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 80ns typical at 5mV overdrive - enables precise timing in high-speed sampling and pulse discrimination. |
| Supply Current per Comparator | 350μA at V+ = 3V - supports ultra-low-power operation in portable and battery-backed systems. |
| Input Offset Voltage | 1mV typical at +25°C - ensures accurate threshold detection with minimal trip-point error. |
| Rail-to-Rail Input Range | –0.2V to (V+ + 0.2V) - allows direct interfacing with sensors or signals exceeding supply rails. |
| Output Voltage Swing | VOL = 0.2V max at 400μA sink; VOH = V+ – 0.2V min at 400μA source - guarantees reliable logic-level compatibility with CMOS/TTL loads. |
| Input Bias Current | 150–300nA - minimizes loading on high-impedance sources such as resistive dividers or sensor bridges. |
| Common-Mode Rejection Ratio | 80μV/V - maintains stable trip points despite supply or ground noise coupling into inputs. |
Pinout & Package
MAX942CSA is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, 1.75mm body width, 1.27mm lead pitch, and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain/push-pull output - drives CMOS/TTL loads directly without external pull-up. |
| 2 | INA− | Inverting input of Comparator A - accepts rail-to-rail analog signals; internally protected against ±0.3V beyond rails. |
| 3 | INA+ | Noninverting input of Comparator A - same rail-to-rail range and fault tolerance as INA−. |
| 4 | V+ | Positive supply terminal - accepts 2.7V to 5.5V; absolute max 6.5V; requires local 0.1μF ceramic decoupling. |
| 5 | INB+ | Noninverting input of Comparator B - electrically identical to INA+; enables independent dual-channel comparison. |
| 6 | INB− | Inverting input of Comparator B - matched performance to INA−; supports differential or single-ended configurations. |
| 7 | OUTB | Comparator B output - fully independent of OUTA; no crosstalk; ≤10ns propagation skew between channels. |
| 8 | GND | Analog ground reference - must connect to low-inductance ground plane; shared return for both comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input voltage range | Operates with inputs from –0.2V to V+ + 0.2V - eliminates level-shifting circuitry for sensors or DACs operating near supply limits. |
| Internal hysteresis | Fixed ~1mV input-referred hysteresis - prevents oscillation on slow or noisy inputs without external components. |
| CMOS/TTL-compatible outputs | Pull to within 0.4V of V+ or GND - directly interfaces with 3.3V/5V logic families without translation or pull-up resistors. |
| Low supply current | 350μA per comparator at 3V - enables always-on monitoring in energy-constrained IoT nodes and wearables. |
| Short-circuit tolerant I/O | All pins withstand continuous short to V+ or GND - enhances robustness in industrial environments with transient faults. |
Applications
| Threshold Detector | Line Receiver |
|---|---|
|
Use Scenario: Detecting when a battery voltage crosses a low-voltage warning threshold (e.g., 3.2V) in portable medical devices. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel monitors upper limit, the other lower limit. Use Value: 1mV offset and rail-to-rail inputs ensure accurate trip points across temperature; 80ns delay enables real-time response to rapid voltage sag. |
Use Scenario: Converting noisy RS-422 differential signals to clean single-ended logic levels in industrial PLC backplanes. IC Role / Device Role / Timing Role: Comparator B acts as differential line receiver with hysteresis to reject common-mode noise on twisted-pair cables. Use Value: Internal hysteresis and 80ns delay provide jitter-free digital recovery even with >100mV of induced EMI on long traces. |
| Zero-Crossing Detector | Sampling Circuit Trigger |
|
Use Scenario: Identifying AC waveform zero crossings for phase-controlled dimming in smart lighting drivers. IC Role / Device Role / Timing Role: Comparator A compares sine-wave input to GND reference; output toggles precisely at crossing point. Use Value: Rail-to-rail input allows direct connection to transformer-coupled AC; 1mV offset minimizes timing error (<1μs at 50Hz). |
Use Scenario: Generating precise sample-enable pulses synchronized to analog signal peaks in data acquisition front-ends. IC Role / Device Role / Timing Role: Dual comparators form peak-detect latch - one triggers on rising edge, second holds state until reset. Use Value: Matched 80ns propagation and ≤10ns skew between channels ensure sub-nanosecond timing correlation for multi-channel sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Slower (1.3μs propagation), higher supply current (500μA), no rail-to-rail inputs, no internal hysteresis. | Suitable only for low-speed, non-critical threshold detection where power and precision are secondary. | Select LM393DR only if cost is primary constraint and 80ns timing or rail-to-rail operation is unnecessary. |
| TLV3502IDR | Faster (4.5ns), lower offset (0.5mV), rail-to-rail inputs/outputs, but higher supply current (1.2mA) and no internal hysteresis. | Better for GHz-range sampling clocks but requires external hysteresis network and consumes >3× more power. | Choose TLV3502IDR when nanosecond timing dominates and board space allows hysteresis resistors; avoid for battery operation. |
Compared with LM393DR and TLV3502IDR, the MAX942CSA uniquely balances 80ns speed, 350μA efficiency, rail-to-rail operation, and built-in hysteresis - making it optimal for portable, noise-prone, and timing-sensitive dual-comparator functions without design compromises.
Availability
MAX942CSA 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 and long production lifecycles.
Supply support for MAX942CSA 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, automotive, and communications applications, with emphasis on low-power, high-reliability solutions.
The MAX941/MAX942/MAX944 family was engineered specifically for 3V/5V single-supply systems demanding high-speed comparison with minimal external components - targeting portable instrumentation, sensor interfaces, and real-time control loops.
FAQ
What is the operating supply voltage range for the MAX942CSA?
The MAX942CSA operates from 2.7V to 5.5V DC on its V+ pin, with absolute maximum rating of +6.5V relative to GND. It delivers specified performance - including 80ns propagation delay and 1mV offset - across this full range, making MAX942CSA suitable for both 3.3V and 5V system rails without redesign.
Does the MAX942CSA have internal hysteresis, and how does it affect circuit design?
Yes, the MAX942CSA includes fixed internal hysteresis (~1mV input-referred), eliminating the need for external positive-feedback resistors. This simplifies PCB layout, reduces component count, and ensures consistent noise immunity across temperature - a key advantage over comparators like LM393DR that require manual hysteresis tuning. The hysteresis is inherent to MAX942CSA's architecture and cannot be disabled.
Can the MAX942CSA drive TTL and CMOS logic directly without pull-up resistors?
Yes, the MAX942CSA outputs swing to within 0.2V of GND and V+ − 0.2V under 400μA load, meeting standard TTL and CMOS VIH/VIL thresholds at both 3.3V and 5V supplies. Its push-pull output stage requires no external pull-up resistors - unlike open-drain comparators - reducing bill-of-materials and ensuring deterministic rise/fall times in MAX942CSA-based interface circuits.
What is the input common-mode voltage range of the MAX942CSA, and why does it matter?
The MAX942CSA accepts input voltages from –0.2V to V+ + 0.2V, extending beyond both supply rails. This rail-to-rail input capability allows direct connection to sensors, DACs, or transducers whose outputs exceed V+ or go below GND - avoiding level-shifters or clamping diodes. It also enables MAX942CSA to function reliably in systems with ground bounce or supply transients.
Is the MAX942CSA pin-compatible with other packages in the MAX94x family?
No - the MAX942CSA (SO-8) shares pinout with MAX942CPA (PDIP-8) and MAX942EUA-T (μMAX-8), but not with quad MAX944 or single MAX941 variants. Pin 1 is OUTA, Pin 2 is INA−, etc., as confirmed in the official pin configuration diagram. However, MAX941-specific pins (SHDN, LATCH) are absent in MAX942CSA, so direct substitution requires functional verification of unused pins.
MAX942CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- 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:
- Surface Mount
- :
- 8-SOIC
MAX942CSA FAQ
1.How can I place an order for MAX942CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942CSA 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 MAX942CSA reliable?
The price and inventory of MAX942CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942CSA is usually 5 days.
3.What payment methods are accepted for MAX942CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942CSA?
MAX942CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942CSA 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 MAX942CSA?
For technical support, including MAX942CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942CSA requirements.
6.How does Aetrix verify that MAX942CSA is sourced from the original manufacturer or authorized distributors?
All MAX942CSA 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 MAX942CSA meets industry standards.
7.What is the process for return or replacement of MAX942CSA?
All MAX942CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX942CSA, 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 MAX942CSA part is unused and in its original packaging.
Return procedure for MAX942CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942CSA Tags
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LM393DT
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LM393DR
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LM239DR
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LM2903P
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NCX2200GMAZ
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