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Analog Devices Inc./Maxim Integrated MAX9691EUA+
- Part No.:
- MAX9691EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9691EUA+.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
MAX9691EUA+ from Maxim Integrated is a single-channel, ultra-fast ECL-output comparator with 1.2ns typical propagation delay, ±11.5mV input offset voltage, and dual ±5.2V/+5V supply operation. It features differential ECL-compatible inputs, complementary open-emitter outputs requiring external 50Ω–200Ω pull-down resistors to –2.0V or –5.2V, and is designed for high-speed line receivers and threshold detection in >600MHz signal paths.
For engineers reviewing the MAX9691EUA+ datasheet, MAX9691EUA+ pinout, MAX9691EUA+ application, or MAX9691EUA+ equivalent, this device requires attention to ECL-level termination, ground-plane PCB layout, input slew-rate compliance (>1V/µs), and proper biasing of GND1 (input stage) and GND2 (output stage) - all critical for stable sub-2ns timing performance.
Technical Context
The MAX9691EUA+ implements a BiCMOS-based ECL comparator core optimized for minimal propagation delay dispersion (150ps) and skew (100ps). Its open-emitter outputs drive 50Ω-terminated transmission lines directly, with logic-high and logic-low output voltages specified at –0.76V and –1.55V (TA = +25°C) under 50Ω load to VT = –2V.
Unlike the latch-enabled MAX9692/MAX9693 variants, the MAX9691EUA+ lacks a latch-enable (LE) input and operates exclusively in continuous-compare mode. Its input common-mode range spans –2.5V to +3.0V, and it achieves 80dB CMRR over that range, supporting robust operation amid supply noise and mismatched source impedances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 1.2ns typical (TA = +25°C); enables clean decision-making on signals with >600MHz fundamental content. |
| Input Offset Voltage | ±11.5mV max (TA = –40°C to +85°C); ensures accurate threshold detection without calibration. |
| Supply Voltages | +5V (VCC) and –5.2V (VEE); mandates dual-rail ECL power delivery with local 0.1µF ceramic bypassing. |
| Output Configuration | Complementary open-emitter outputs; requires external pull-down resistors (50Ω–200Ω to –2V or 240Ω–2000Ω to –5.2V). |
| Input Common-Mode Range | –2.5V to +3.0V; supports direct interfacing with ECL, PECL, and LVDS sources without level-shifting. |
| Propagation Delay Skew | 100ps max; guarantees matched timing between Q and Q̅ outputs for differential sampling integrity. |
| Dispersion | 150ps max (VOD = 10mV to 100mV); maintains consistent delay across varying input overdrive conditions. |
Pinout & Package
MAX9691EUA+ is housed in an 8-pin µMAX® package (package code U8+1, outline 21-0036), measuring 3mm × 3mm × 0.8mm with exposed pad thermal enhancement. The package uses gull-wing leads, RoHS-compliant matte-tin plating, and requires solder reflow at ≤260°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply (+5V); must be bypassed to GND with 0.1µF ceramic capacitor placed adjacent to pin. |
| 2 | IN+ | Noninverting differential input; accepts ECL-level signals within –2.5V to +3.0V common-mode range. |
| 3 | IN– | Inverting differential input; paired with IN+ for high-gain comparison with 60kΩ differential input resistance. |
| 4 | VEE | Negative supply (–5.2V); requires separate 0.1µF ceramic bypass to GND near pin. |
| 5 | Q̅ OUT | Complementary ECL output; open-emitter - connects to external pull-down resistor for logic-level definition. |
| 6 | Q OUT | True ECL output; complements Q̅ OUT with matched 100ps skew; same termination requirements apply. |
| 7 | GND2 | Output-stage ground; ties to solid copper ground plane - separates output bias path from input-stage ground (Pin 8). |
| 8 | GND1 | Input-stage ground; must be connected to GND2 externally via low-inductance path on ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| 1.2ns propagation delay | Enables real-time decision-making in >600MHz RF sampling, high-speed serial link receivers, and time-of-flight systems. |
| 100ps Q/Q̅ skew | Maintains precise differential timing integrity for clock/data recovery and strobed sampling applications. |
| 150ps dispersion | Ensures consistent propagation delay across input overdrive variations - critical for amplitude-insensitive triggering. |
| 80dB CMRR | Rejects common-mode noise on twisted-pair or coaxial inputs, improving noise immunity in noisy industrial environments. |
| BiCMOS process | Combines bipolar speed with CMOS integration density - delivers ECL performance with lower power than pure bipolar comparators. |
Applications
| High-Speed Line Receivers | Threshold Detectors |
|---|---|
Use Scenario: Recovering NRZ data from 50Ω coaxial or microstrip traces in backplane or optical receiver front-ends. IC Role / Device Role / Timing Role: Differential ECL comparator converting analog signal crossings into clean digital logic edges with sub-2ns latency. Use Value: 1.2ns delay and 100ps skew preserve eye diagram integrity at 1+ Gbps, enabling reliable clock-data recovery without retiming buffers. |
Use Scenario: Detecting voltage excursions beyond programmable thresholds in laser diode bias control or power-supply fault monitoring. IC Role / Device Role / Timing Role: Precision threshold comparator with ±11.5mV offset ensuring <10mV detection resolution under full temperature range. Use Value: 80dB CMRR rejects supply ripple and ground bounce, preventing false triggers in high-noise power-conversion systems. |
| Peak Detectors | High-Speed Triggers |
Use Scenario: Capturing transient voltage peaks in RF pulse detection or oscilloscope front-end signal conditioning. IC Role / Device Role / Timing Role: Fast comparator latching peak amplitude against reference using external sample-hold circuitry. Use Value: 150ps dispersion ensures consistent trigger point regardless of input amplitude - essential for repeatable pulse-width measurement. |
Use Scenario: Generating synchronous strobes for ADC sampling or logic analyzer capture in test equipment and instrumentation. IC Role / Device Role / Timing Role: Ultra-low-jitter edge detector generating precise timing markers from analog waveforms. Use Value: Sub-2ns delay variation across temperature (–40°C to +85°C) guarantees deterministic trigger latency in automated test systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast ECL comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9692EUB+ | Includes latch-enable (LE) input; 10-pin µMAX; adds sample-hold capability but increases propagation delay to 1.8ns max. | Required where gated comparison or pipeline synchronization is needed; unsuitable if continuous compare mode is mandatory. | Select MAX9692EUB+ only when latch functionality is required - MAX9691EUA+ offers lower latency and simpler biasing for streaming applications. |
| ADCMP572BCPZ-R7 | Single 2.5V/3.3V CML-output comparator; 1.1ns delay; no ECL supply support; requires level translation for –5.2V systems. | Targets modern low-voltage SERDES and FPGA I/O interfaces; incompatible with legacy ECL infrastructure. | Choose ADCMP572BCPZ-R7 for new 3.3V designs with CML compatibility; retain MAX9691EUA+ for existing –5.2V/+5V ECL systems. |
Compared with MAX9692EUB+, the MAX9691EUA+ eliminates latch-control complexity and reduces propagation delay by up to 0.6ns - critical for real-time signal analysis. Against ADCMP572BCPZ-R7, it preserves native ECL interoperability but requires dual-rail supplies, making it the preferred choice for legacy telecom and military timing systems.
Availability
MAX9691EUA+ is available at Aetrix Electronics and suitable for high-speed line receivers, threshold detectors, peak detectors, and high-speed triggers requiring stable component supply across industrial, test & measurement, and defense electronics programs.
Supply support for MAX9691EUA+ 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-speed interface ICs for demanding industrial, communications, and automotive applications.
The MAX9691EUA+ belongs to Maxim's ultra-high-speed comparator product line, engineered specifically for ECL-level signal acquisition in >600MHz applications where sub-2ns latency and matched differential timing are non-negotiable.
FAQ
What power supplies does the MAX9691EUA+ require?
The MAX9691EUA+ requires dual supplies: +5V on VCC (Pin 1) and –5.2V on VEE (Pin 4). Both rails must be bypassed locally with 0.1µF ceramic capacitors. The device draws 26mA typical supply current and is not compatible with single-supply or 3.3V-only operation. Operating outside these supply ranges risks permanent damage per absolute maximum ratings.
How are the outputs of the MAX9691EUA+ terminated?
The MAX9691EUA+ features open-emitter Q and Q̅ outputs (Pins 5 and 6) that require external pull-down resistors. For –2.0V termination, use 50Ω–200Ω resistors; for –5.2V termination, use 240Ω–2000Ω. These resistors define ECL logic levels and must connect to a clean, low-impedance ground plane - improper termination causes timing jitter and logic errors.
Does the MAX9691EUA+ have a latch-enable function?
No, the MAX9691EUA+ does not include a latch-enable (LE) input. It operates exclusively in continuous-compare mode. The LE function is present only on the MAX9692 and MAX9693 variants. If used in a design originally intended for MAX9692/MAX9693, the LE pin must be omitted - MAX9691EUA+ has no LE pin and cannot perform sample-hold operations.
What is the input common-mode voltage range for the MAX9691EUA+?
The MAX9691EUA+ supports an input common-mode voltage range of –2.5V to +3.0V, verified across –40°C to +85°C. This allows direct connection to ECL, PECL, and LVDS sources without level-shifting circuitry. Inputs driven outside this range may cause undefined output behavior or increased offset error, though the device will not be damaged per absolute maximum ratings.
Why are there two ground pins (GND1 and GND2) on the MAX9691EUA+?
GND1 (Pin 8) biases the input differential pair; GND2 (Pin 7) biases the ECL output stage. They must be connected together externally via a low-inductance path to a solid copper ground plane. Separating them prevents coupling of output switching noise into the sensitive input stage - a key requirement for achieving specified 100ps skew and 150ps dispersion performance.
MAX9691EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- with Latch
- Number of Elements:
- 1
- Output Type:
- Complementary, ECL
- Voltage - Supply, Single/Dual (±):
- -
- :
- 6.5mV @ 5V
- Voltage - Input Offset (Max):
- 20µA @ 5V
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 26mA
- Current - Quiescent (Max):
- 80dB CMRR, 60dB PSRR
- CMRR, PSRR (Typ):
- 1.8ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX9691EUA+ FAQ
1.How can I place an order for MAX9691EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9691EUA+ 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 MAX9691EUA+ reliable?
The price and inventory of MAX9691EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9691EUA+ is usually 5 days.
3.What payment methods are accepted for MAX9691EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9691EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9691EUA+?
MAX9691EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9691EUA+ 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 MAX9691EUA+?
For technical support, including MAX9691EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9691EUA+ requirements.
6.How does Aetrix verify that MAX9691EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX9691EUA+ 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 MAX9691EUA+ meets industry standards.
7.What is the process for return or replacement of MAX9691EUA+?
All MAX9691EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9691EUA+, 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 MAX9691EUA+ part is unused and in its original packaging.
Return procedure for MAX9691EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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