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Analog Devices Inc./Maxim Integrated MAX999EUK-T
- Part No.:
- MAX999EUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX999EUK-T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,653
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Product details
Overview
The MAX999EUK-T from Maxim Integrated is a single ultra-high-speed comparator with internal hysteresis, optimized for +3V or +5V single-supply operation. It features 4.5ns propagation delay (5mV overdrive), ±3.5mV input-referred hysteresis, rail-to-rail beyond-the-rails input range (–0.1V to VCC + 0.1V), and TTL/CMOS-compatible push-pull output capable of sourcing/sinking 4mA within 0.52V of GND or VCC. It is used in GPS receivers and high-speed sampling circuits.
For engineers reviewing the MAX999EUK-T datasheet, MAX999EUK-T pinout, MAX999EUK-T application, or MAX999EUK-T equivalent, key selection considerations include propagation delay vs. overdrive, input offset voltage stability over temperature, output drive capability into 5pF load, and compatibility with low-voltage portable systems requiring Beyond-the-Rails input operation.
Technical Context
This comparator uses a current-driven output stage enabling fast slew rates and low static power after transition. Its internal 3.5mV hysteresis eliminates external feedback resistors and prevents oscillation near trip points, critical for clean switching in noisy environments.
The input stage includes dual 200Ω series resistors and front-to-back diode clamps, limiting differential input voltage to ≤2.1V and allowing common-mode operation 100mV beyond both supply rails. Input bias current remains ≤±30µA across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns typical at 5mV overdrive - enables sub-5ns decision timing in high-speed sampling and clock recovery. |
| Supply Voltage Range | +2.7V to +5.5V - supports direct integration into 3V and 5V logic domains without level-shifting. |
| Input Common-Mode Range | –0.1V to VCC + 0.1V - accepts signals below GND or above VCC, e.g., sensor outputs in battery-powered GPS front-ends. |
| Output Drive | Sources/sinks 4mA to within 0.52V of rails - directly drives CMOS/TTL loads without external pull-ups. |
| Input Hysteresis | 3.5mV typical - ensures noise-immune threshold detection without external components. |
| Supply Current | 5mA per comparator at VCC = 5V - balances speed and power for portable applications. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive-adjacent embedded systems. |
Pinout & Package
The MAX999EUK-T is housed in a 5-pin SOT23 package (package code U5+2), with exposed pad not connected. Pin 1 is IN–, Pin 2 is IN+, Pin 3 is GND, Pin 4 is VCC, and Pin 5 is Q (TTL output). No shutdown or latch control pins are present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN– | Inverting input - accepts analog signals up to 100mV beyond rails; differential input impedance is 8kΩ. |
| 2 | IN+ | Noninverting input - same rail-exceeding range as IN–; common-mode input impedance is 130kΩ. |
| 3 | GND | Analog/digital ground reference - must connect to low-inductance ground plane for stable high-speed operation. |
| 4 | VCC | Positive supply - must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin. |
| 5 | Q | TTL/CMOS-compatible output - active-high, push-pull, no external pull-up required; sinks/sources 4mA. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast propagation | 4.5ns typical delay enables >200MHz sampling rate in track-and-hold or ADC front-end designs. |
| Beyond-the-Rails inputs | Accepts –0.1V to VCC + 0.1V - interfaces directly with op-amp outputs or sensors operating outside supply rails. |
| Internal hysteresis | 3.5mV fixed hysteresis eliminates need for external resistor networks and improves noise margin in threshold detection. |
| Single-supply optimization | Operates from +2.7V to +5.5V - compatible with Li-ion battery discharge profiles and 3.3V system rails. |
| Low-output impedance | Drives 5pF load with <7ns rise/fall time - suitable for feeding FPGA clock enable or microcontroller interrupt lines. |
Applications
| GPS Receiver Front-End | High-Speed Sampling Circuit |
|---|---|
Use Scenario: Detecting zero-crossings of L1-band IF signals (1.575GHz downconverted to ~10–20MHz) before digital correlation. IC Role / Device Role / Timing Role: High-speed comparator converting analog IF waveform to clean digital edge for clocked sampling and bit synchronization. Use Value: 4.5ns propagation delay and 3.5mV hysteresis ensure jitter-free edge generation under RF-induced noise, improving acquisition sensitivity. | Use Scenario: Triggering sample capture in oscilloscope or logic analyzer front-ends where analog signal edges must be digitized with minimal latency. IC Role / Device Role / Timing Role: Threshold detector generating precise strobe pulses aligned to input signal transitions for ADC sampling control. Use Value: Sub-5ns delay and rail-exceeding inputs allow accurate timing alignment even with undershoot/overshoot on fast edges. |
| Portable Threshold Detector | Line Receiver for Industrial Bus |
Use Scenario: Monitoring battery voltage or sensor output in handheld medical devices to trigger low-power alerts or mode switching. IC Role / Device Role / Timing Role: Single-supply comparator detecting crossing of programmable thresholds (e.g., 2.8V battery cutoff) with hysteresis to prevent chatter. Use Value: 5mA supply current and 3.5mV hysteresis enable reliable, low-power threshold detection without external components. | Use Scenario: Receiving differential RS-422/RS-485-like signals in factory automation nodes where EMI immunity and fast response are critical. IC Role / Device Role / Timing Role: Single-ended line receiver converting noisy bus signals to clean logic levels for microcontroller input. Use Value: Beyond-the-Rails input range accommodates common-mode transients up to ±0.1V, while 4.5ns delay supports >100Mbps data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH7322MA/NOPB | Dual-channel, 4.5ns delay, but requires dual supply (±5V) or level-shifted inputs; no Beyond-the-Rails capability. | Not suitable for single-supply portable systems with rail-exceeding inputs; better for high-precision lab equipment. | Select only if dual-channel operation and higher PSRR (60dB) outweigh loss of rail-to-rail input flexibility. |
| ADCMP600BRMZ-REEL7 | Single-channel, 2.5ns delay, 2.7–5.5V supply, but input range limited to GND–VCC; no internal hysteresis. | Requires external hysteresis resistors; unsuitable for GPS zero-crossing where noise immunity is critical without added BOM. | Choose when absolute minimum propagation delay is mandatory and board space allows external hysteresis network. |
Compared with LMH7322MA/NOPB and ADCMP600BRMZ-REEL7, the MAX999EUK-T uniquely combines single-supply operation, Beyond-the-Rails inputs, and integrated 3.5mV hysteresis in a 5-pin SOT23 - reducing component count and layout complexity for portable, high-speed threshold detection.
Availability
MAX999EUK-T is available at Aetrix Electronics and suitable for GPS receivers, portable medical devices, high-speed test equipment, and industrial line receivers requiring stable component supply and long-term manufacturability.
Supply support for MAX999EUK-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) designs precision analog, mixed-signal, and high-speed ICs for industrial, communications, and consumer applications.
The MAX961–MAX964/MAX997/MAX999 family delivers ultra-high-speed comparators optimized for single-supply, low-voltage, noise-immune threshold detection in portable and timing-critical systems.
FAQ
What is the maximum capacitive load the MAX999EUK-T can drive while maintaining 4.5ns propagation delay?
The MAX999EUK-T is characterized with a 5pF load; propagation delay increases with capacitance - e.g., 6.0ns at 20pF (per Typical Operating Characteristics, Figure MAX997toc03). For designs requiring ≤5ns delay, keep total node capacitance ≤10pF including PCB trace and input capacitance of driven device. The MAX999EUK-T output stage is current-driven, so slew rate degrades linearly with load capacitance.
Does the MAX999EUK-T support operation below 2.7V, such as at 1.8V?
No - the MAX999EUK-T is specified for VCC = +2.7V to +5.5V only. Operation below 2.7V is outside Absolute Maximum Ratings and not characterized. Input common-mode range, propagation delay, and output drive degrade unpredictably below 2.7V. For 1.8V systems, consider the MAX9060 or TLV3501, which are explicitly rated for lower supply voltages.
Is there a lead-free, RoHS-compliant version of the MAX999EUK-T?
Yes - the MAX999EUK-T itself is RoHS-compliant and lead-free, indicated by the "+" suffix in its full ordering code MAX999EUK+T (though the top mark "ACAB" confirms the same package). The SOT23 package (U5+2) meets JEDEC J-STD-020 moisture sensitivity level 1 and is compatible with standard reflow profiles.
Can the MAX999EUK-T be used in place of the MAX999AAUK+T?
No - the MAX999EUK-T is rated for –40°C to +85°C, while the MAX999AAUK+T is rated for –40°C to +125°C and has wider input offset voltage tolerance (±6.0mV vs. ±4.5mV) and slightly higher VOL/VOH limits. They share pinout and basic functionality, but thermal and precision specs differ; substitution requires validation across the full target temperature range.
Why does the MAX999EUK-T have no shutdown or latch-enable pins, unlike other family members?
The MAX999EUK-T is the single-comparator variant without shutdown or latch features - those functions are implemented only in MAX961/MAX963/MAX964/MAX997. Its simplified 5-pin SOT23 footprint prioritizes minimal size and cost for applications needing only basic high-speed comparison, such as GPS zero-crossing or simple threshold detection where continuous operation is acceptable.
MAX999EUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-74A, SOT-753
- Series:
- Beyond-the-Rails™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.5V
- :
- 1.5mV @ 5V
- Voltage - Input Offset (Max):
- 15µA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 7mA
- Current - Quiescent (Max):
- 80dB CMRR, 86.02dB PSRR
- CMRR, PSRR (Typ):
- 7ns
- Propagation Delay (Max):
- 3.5mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
MAX999EUK-T FAQ
1.How can I place an order for MAX999EUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX999EUK-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 MAX999EUK-T reliable?
The price and inventory of MAX999EUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX999EUK-T is usually 5 days.
3.What payment methods are accepted for MAX999EUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX999EUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX999EUK-T?
MAX999EUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX999EUK-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 MAX999EUK-T?
For technical support, including MAX999EUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX999EUK-T requirements.
6.How does Aetrix verify that MAX999EUK-T is sourced from the original manufacturer or authorized distributors?
All MAX999EUK-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 MAX999EUK-T meets industry standards.
7.What is the process for return or replacement of MAX999EUK-T?
All MAX999EUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX999EUK-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 MAX999EUK-T part is unused and in its original packaging.
Return procedure for MAX999EUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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