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Analog Devices Inc./Maxim Integrated MAX912CSE
- Part No.:
- MAX912CSE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX912CSE.pdf
- Description:
- IC COMPARATOR 2 W/LATCH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,233
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Product details
Overview
MAX912CSE from Maxim Integrated is a dual, ultra-fast, low-power precision TTL comparator with differential inputs and complementary TTL outputs. It operates from single +5V or dual ±5V supplies, delivers 10ns typical propagation delay, consumes 6mA per comparator at +5V, and features stable linear-region operation-enabling reliable zero-crossing detection and high-speed sampling in switching regulators and V/F converters.
For engineers reviewing the MAX912CSE datasheet, MAX912CSE pinout, MAX912CSE application, or MAX912CSE equivalent, this page provides verified technical context, package-validated pin functions, real-world use-value mappings for industrial timing and signal conditioning, and two confirmed alternative comparators with documented functional trade-offs.
Technical Context
The MAX912CSE integrates two independent high-speed comparators sharing common supply rails but featuring separate latch-enable (LEA/LEB) and input pairs (INA±/INB±). Its bipolar process enables rail-to-rail input common-mode range extending 200mV below V− and 1.5V below V+, supporting −5.2V to +3.5V operation on ±5V supplies.
Each comparator includes a transparent latch function activated by TTL-level LE pins; outputs remain stable during slow-moving input transitions due to absence of internal hysteresis and oscillation-free linear-region behavior-eliminating need for external hysteresis networks that degrade resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 10ns typ (ΔVIN = 100mV, VOD = 20mV); enables ≤85MHz clocked latch operation in high-speed triggers. |
| Supply Voltage Range | +4.5V to +5.5V (single) or ±5V (dual); supports direct interface with standard TTL logic and legacy ±5V systems. |
| Input Offset Voltage | 0.8mV max at +25°C; ensures sub-millivolt threshold accuracy without trimming in precision level-shift or zero-crossing circuits. |
| Supply Current | 6mA per comparator at +5V; allows dual-channel high-speed comparison in battery-sensitive or thermally constrained designs. |
| Common-Mode Input Range | −5.2V to +3.5V (±5V supply); accommodates signals referenced to negative rails, e.g., op-amp outputs in dual-supply analog front-ends. |
| Output Type | Complementary TTL (QA/QA, QB/QB); drives standard TTL loads directly without level-shifting or pull-up resistors. |
| Linear-Region Stability | No oscillation in linear region; permits accurate amplitude measurement of slow triangle/sine waves without hysteresis-induced dead bands. |
Pinout & Package
MAX912CSE is housed in a 16-pin narrow SO (SOIC-N) package with 0.150" body width and 1.27mm pitch, optimized for high-density PCB layouts while maintaining thermal dissipation capability up to 696mW at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | QA, QB | TTL output (active-high) for comparator A and B; sinks 10mA, sources 4mA, compatible with 74LS logic inputs. |
| 2, 15 | QA, QB | Complementary TTL output (active-low); provides differential signaling or direct drive to SR latches. |
| 3, 14 | GND | Logic ground reference; both pins must be connected to system ground to ensure latch timing integrity and noise immunity. |
| 4, 13 | LEA, LEB | Latch enable for comparator A/B; TTL-high or open = latched state; TTL-low = transparent mode (output follows input). |
| 5, 12 | N.C. | No internal connection; must remain unconnected and unstubbed to avoid parasitic coupling or EMI pickup. |
| 6 | V− | Negative supply rail; tied to GND for single +5V operation or −5V for dual supply; requires 0.1µF ceramic bypass to GND. |
| 7, 9 | INA−, INB+ | Inverting input for A, noninverting input for B; differential pair supports precise threshold comparison with 80dB CMRR. |
| 8, 10 | INA+, INB− | Noninverting input for A, inverting input for B; input voltage range extends 200mV below V−, enabling ground-referenced sensing. |
| 11 | V+ | Positive supply rail (+5V); powers analog core and TTL outputs; requires 0.1µF ceramic + ≥10µF tantalum bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast 10ns propagation | Enables sampling of >85MHz periodic signals with deterministic timing margins in pulse-width discriminators. |
| Rail-inclusive input range | Accepts inputs down to −5.2V (on ±5V), allowing direct interface with op-amps, DACs, or sensors operating beyond GND. |
| Stable linear-region operation | Eliminates need for external hysteresis, preserving full input resolution for low-slew-rate signals like V/F converter outputs. |
| Independent latch controls | LEA/LEB allow asynchronous capture of two independent analog events-critical for dual-channel time-of-flight or phase-difference measurement. |
| Low 6mA/comparator supply current | Reduces thermal load in multi-comparator arrays used in Ethernet line receivers or switching regulator feedback loops. |
Applications
| Zero-Crossing Detectors | Ethernet Line Receivers |
|---|---|
|
Use Scenario: Detecting polarity reversal of AC mains or transformer-coupled signals in power monitoring systems. IC Role / Device Role / Timing Role: Dual comparator monitors positive/negative half-cycles independently; latch enables synchronized edge capture at microsecond-level timing. Use Value: 0.8mV offset and linear-region stability ensure consistent zero-crossing point detection across temperature, eliminating false triggers in energy metering. |
Use Scenario: Recovering digital data from differential Manchester-encoded signals in 10BASE-T Ethernet physical layer. IC Role / Device Role / Timing Role: Comparator A and B decode differential pair (TD+/TD−) with TTL-compatible outputs feeding MAC-layer logic. Use Value: 10ns propagation delay and 80dB CMRR reject common-mode noise on twisted-pair lines, maintaining BER <10⁻¹² at 10Mbps. |
| Switching Regulators | High-Speed Sampling Circuits |
|
Use Scenario: Monitoring feedback voltage against reference in synchronous buck converters operating at 500kHz–2MHz. IC Role / Device Role / Timing Role: Comparator A compares FB node to reference; latch synchronizes output to PWM clock edge for jitter-free control loop updates. Use Value: Stable linear-region behavior prevents oscillation during soft-start or light-load conditions where error amplifier output slews slowly. |
Use Scenario: Capturing peak amplitude or timing edges of fast pulses in oscilloscope front-ends or time-domain reflectometry. IC Role / Device Role / Timing Role: Dual comparator implements window comparator (IN+ vs IN−) with independent latches for rising/falling edge hold. Use Value: Channel-to-channel delay matching ≤500ps ensures sub-nanosecond timing correlation between upper/lower threshold decisions. |
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), no latch, open-collector outputs requiring pull-ups; 2mV offset, single-supply only. | Suitable for low-cost, low-speed window comparators in consumer power supplies-not for >100kHz sampling or latch-synchronized capture. | Select LM393DR only when cost dominates and speed/stability requirements are relaxed; MAX912CSE offers 130× faster response and integrated latch. |
| LT1719CS8#PBF | Faster (4.5ns), rail-to-rail inputs, push-pull outputs, but no latch function; 1.5mV offset; higher 12mA supply current per channel. | Better for ultra-high-speed ADC drivers or laser diode modulation, but lacks independent latch control needed for dual-event capture. | Choose LT1719CS8#PBF when raw speed and input range are critical and latch functionality is implemented externally; MAX912CSE integrates latch with lower power. |
Compared with LM393DR and LT1719CS8#PBF, the MAX912CSE uniquely combines 10ns speed, dual independent latches, linear-region stability, and 6mA/channel power-making it the only option for synchronized dual-threshold detection in space-constrained, thermally sensitive, or high-resolution timing applications.
Availability
MAX912CSE is available at Aetrix Electronics and suitable for switching regulators, Ethernet line receivers, and high-speed sampling circuits requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX912CSE 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 markets.
The MAX912CSE belongs to Maxim's precision high-speed comparator product line, designed specifically for applications demanding nanosecond timing accuracy, latch-synchronized decision making, and stable operation across wide input voltage and temperature ranges.
FAQ
What is the maximum operating frequency for latch-enabled operation of the MAX912CSE?
The MAX912CSE supports latch-enable (LEA/LEB) signal rates up to 70MHz at +25°C with 5mV input overdrive, and up to 85MHz with 20mV overdrive. This is determined by its 10ns typical propagation delay and 7ns latch propagation delay (tLPD), ensuring deterministic output capture within tight timing windows required in high-speed triggers and sampling circuits. The MAX912CSE maintains this performance across its full 0°C to +70°C commercial temperature range.
Does the MAX912CSE require external hysteresis for stable operation?
No, the MAX912CSE does not require external hysteresis. Its unique bipolar design eliminates oscillation in the linear region-even with slow-moving input signals-allowing accurate threshold detection without sacrificing resolution. Adding hysteresis degrades input resolution by introducing a dead band, which contradicts the MAX912CSE's design intent. The MAX912CSE achieves stable operation intrinsically, as confirmed by its "Stable in the Linear Region" feature and industry-standard 686 response validation.
Can the MAX912CSE operate from a single 3.3V supply?
No, the MAX912CSE is not specified for 3.3V-only operation. Its absolute maximum ratings and electrical characteristics are defined for single +5V (4.5V to 5.5V) or dual ±5V supplies. Operation below +4.5V is not guaranteed, and TTL output levels (VOH ≥ 2.4V, VOL ≤ 0.4V) require sufficient headroom from a +5V rail. For 3.3V systems, consider alternatives like the MAX9021 or TLV3501, but the MAX912CSE must be used with +5V or ±5V supplies per its datasheet specifications.
What is the purpose of the N.C. pins (pins 5 and 12) on the MAX912CSE?
Pins 5 and 12 on the MAX912CSE are No Connection (N.C.) terminals-physically present but not bonded to any internal circuitry. They must remain unconnected and unstubbed on the PCB to prevent parasitic capacitance, EMI coupling, or unintended current paths. Leaving them floating is acceptable, but routing traces or placing vias on these pads may degrade high-speed performance or cause latch timing anomalies. This mechanical pin assignment is consistent across the MAX912 family's 16-pin narrow SO package.
How does the MAX912CSE handle input signals that exceed the supply rails?
The MAX912CSE allows input voltages to exceed either supply rail-up to −0.3V below V− and +14V above V− (i.e., up to +19V on ±5V supplies)-without damage or phase reversal, thanks to its robust input stage protection. This rail-exceeding capability enables direct interfacing with sensors, transformers, or op-amps whose outputs swing beyond the comparator's supply range. However, sustained overvoltage beyond Absolute Maximum Ratings risks permanent damage, so external clamping remains advisable in harsh environments. The MAX912CSE's specification explicitly confirms this behavior in its Absolute Maximum Ratings table.
MAX912CSE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Latch
- Number of Elements:
- 2
- Output Type:
- Complementary, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 10V
- :
- 2mV @ ±5V
- Voltage - Input Offset (Max):
- 5µA @ ±5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 10mA
- Current - Quiescent (Max):
- 110dB CMRR, 100dB PSRR
- CMRR, PSRR (Typ):
- 14ns
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 16-SOIC
MAX912CSE FAQ
1.How can I place an order for MAX912CSE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX912CSE 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 MAX912CSE reliable?
The price and inventory of MAX912CSE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX912CSE is usually 5 days.
3.What payment methods are accepted for MAX912CSE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX912CSE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX912CSE?
MAX912CSE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX912CSE 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 MAX912CSE?
For technical support, including MAX912CSE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX912CSE requirements.
6.How does Aetrix verify that MAX912CSE is sourced from the original manufacturer or authorized distributors?
All MAX912CSE 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 MAX912CSE meets industry standards.
7.What is the process for return or replacement of MAX912CSE?
All MAX912CSE units undergo pre-shipment inspection (PSI). If there is an issue with MAX912CSE, 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 MAX912CSE part is unused and in its original packaging.
Return procedure for MAX912CSE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX912CSE Tags
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