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Analog Devices Inc./Maxim Integrated MAX902ESD-T
- Part No.:
- MAX902ESD-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX902ESD-T.pdf
- Description:
- IC COMPARATOR 2 W/LATCH 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,054
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Product details
Overview
MAX902ESD-T from Maxim Integrated is a high-speed, low-power quad voltage comparator with differential analog inputs, TTL-compatible outputs, independent latch inputs per channel, and separate analog/digital supply rails (VCC/VEE and VDD). It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, and supports input common-mode range extending to the negative rail - ideal for ground-sensing line receivers and high-speed A/D converter trigger circuits.
For engineers reviewing the MAX902ESD-T datasheet, MAX902ESD-T pinout, MAX902ESD-T application, or MAX902ESD-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative options for legacy system maintenance and redesign scenarios.
Technical Context
The MAX902ESD-T implements four independent high-gain, wide-bandwidth comparators in a single SO-14 package, each with dedicated TTL-compatible latch control (pins 4, 5, 12, 13) enabling synchronous sampling of fast analog signals. Its dual-supply architecture isolates analog signal paths (VCC = +5V to +10V, VEE = −5V or GND) from digital logic (VDD = +5V), minimizing noise coupling in mixed-signal systems.
Each comparator features rail-to-rail input common-mode range down to VEE − 0.1V, output drive capability of 8mA sink / 1mA source, and guaranteed timing performance across −40°C to +85°C. Latch functionality is fully specified with 10ns disable-to-output delays, 2ns minimum setup time, and 1ns hold time - critical for synchronized data acquisition in sampling circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 8ns typical (5mV overdrive, CL = 15pF): enables reliable sampling of >100MHz input edges in A/D front-ends. |
| Power Dissipation | 18mW per comparator at +5V: allows four-channel operation within 72mW total, suitable for thermally constrained PCBs. |
| Input Common-Mode Range | VEE − 0.1V to VCC − 2.25V: supports ground-referenced sensing with single +5V analog supply (VEE = GND). |
| Output Drive | VOL = 0.4V @ 8mA sink; VOH = 2.4V @ 1mA source: directly interfaces standard LS-TTL loads without external pull-ups. |
| Latch Timing | tpw(D) = 10ns min; ts = 2ns; th = 1ns: permits tight synchronization with 100+ MHz digital control clocks. |
| Supply Flexibility | Analog supply: +5V to +10V (VEE = GND) or ±5V; Digital supply: fixed +5V (VDD): simplifies power tree in multi-rail systems. |
| Operating Temperature | −40°C to +85°C: qualified for industrial and automotive under-hood environments requiring extended thermal stability. |
Pinout & Package
MAX902ESD-T is housed in a 14-pin narrow SOIC (SO-14) package with 1.27mm pitch, JEDEC MS-012AC compliant, and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | IN− (A, B, C, D) | Negative input terminals for channels A–D; referenced to VEE; support differential or single-ended configurations. |
| 2, 7, 10, 15 | IN+ (A, B, C, D) | Positive input terminals for channels A–D; common-mode range includes VEE, enabling ground-sensing. |
| 3 | GND | Digital ground reference for VDD and latch logic; must be tied to system DGND with low-inductance path. |
| 4, 5, 12, 13 | OUT (A, B, C, D) | TTL-compatible open-collector outputs with internal pull-up; drive LS-TTL loads directly (fan-out = 4). |
| 6 | VEE | Negative analog supply and substrate connection; set to −5V (dual supply) or GND (single supply) for rail-to-rail input operation. |
| 11 | VDD | +5V digital supply for latch circuitry and output stage; must be decoupled locally with 100nF ceramic capacitor. |
| 14 | VCC | +5V to +10V positive analog supply; powers comparator core; requires separate 100nF decoupling from VDD. |
Key Features
| Feature | Design Value |
|---|---|
| 8ns propagation delay | Enables accurate timing capture in high-speed sampling circuits where sub-10ns jitter margin is required. |
| Independent per-channel latches | Allows asynchronous or synchronized sampling of four distinct analog signals using discrete latch control lines. |
| Rail-to-rail input common-mode range | Permits direct interface to sensors referenced to system ground without level-shifting circuitry. |
| Separate analog/digital supplies | Reduces digital switching noise coupling into analog comparators, improving noise immunity in mixed-signal PCBs. |
| TTL-compatible outputs with internal pull-ups | Eliminates need for external pull-up resistors, reducing BOM count and board space in dense layouts. |
Applications
| High-Speed A/D Converter Triggering | Line Receiver with Synchronization |
|---|---|
|
Use Scenario: Generating precise sample-enable pulses for flash or pipeline ADCs operating above 50MSPS. IC Role / Device Role / Timing Role: Quad comparator acts as parallel threshold detector on analog input channels, with latched outputs providing glitch-free strobes aligned to system clock edges. Use Value: 8ns propagation delay and 1ns hold time ensure <100ps timing skew between four sampled channels, preserving inter-channel phase integrity. |
Use Scenario: Receiving and conditioning high-speed serial data streams (e.g., RS-422, LVDS-derived) in industrial backplanes. IC Role / Device Role / Timing Role: Comparator converts differential line signals to TTL logic levels; latch inputs synchronize recovered data to local clock domain. Use Value: Input common-mode range including VEE allows direct interface to −1V to +4V line voltages without bias networks, reducing component count. |
| Threshold Detector for Sensor Arrays | PWM Timing Reference Generator |
|
Use Scenario: Monitoring eight temperature or pressure sensor outputs via multiplexed analog inputs with programmable alarm thresholds. IC Role / Device Role / Timing Role: Two MAX902ESD-T devices (four channels each) compare sensor voltages against DAC-generated reference levels; latches freeze alarm states during microcontroller read cycles. Use Value: Independent latch inputs per channel enable atomic capture of alarm conditions across all sensors without software overhead or race conditions. |
Use Scenario: Generating edge-aligned PWM signals for motor control or LED dimming with precise dead-time insertion. IC Role / Device Role / Timing Role: Comparator compares ramp generator output against programmable threshold; latch synchronizes output transitions to system timer overflow events. Use Value: 10ns latch-disable delay ensures PWM edges align within ±10ns of timer events, supporting <1% duty-cycle resolution at 1MHz switching frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9202ESA+ | Pin-compatible replacement; same SO-14 package; 8ns propagation delay; 9mW/comparator (half power); no latch inputs. | Requires external latch logic or FPGA-based synchronization; better suited for new designs prioritizing power efficiency over latch integration. | Select when redesigning for lower thermal load and when latch functionality can be implemented digitally. |
| LM339MTX/NOPB | Quad comparator in SO-14; 1.3µs propagation delay; no latch; rail-to-rail inputs; 0.8mW/comparator; −40°C to +125°C. | Not suitable for >1MHz signal discrimination; used in cost-sensitive, low-speed monitoring (e.g., battery voltage thresholds). | Select only for non-critical, low-frequency threshold detection where speed and latch are unnecessary. |
Compared with MAX902ESD-T, MAX9202ESA+ offers identical speed and footprint with half the power but removes latch capability, while LM339MTX/NOPB trades speed and latch for ultra-low power and extended temperature range - making MAX902ESD-T uniquely suited for legacy high-speed synchronized sampling where latch-per-channel is mandatory.
Availability
MAX902ESD-T is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy test equipment upgrades, and high-speed data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for MAX902ESD-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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-speed interface ICs for industrial, communications, and computing applications.
The MAX900–MAX903 family was designed specifically for high-speed data acquisition systems requiring sub-10ns timing accuracy, latch-controlled sampling, and robust noise isolation between analog and digital domains.
FAQ
What is the maximum operating frequency supported by the MAX902ESD-T for reliable signal discrimination?
The MAX902ESD-T is characterized for 8ns typical propagation delay at 5mV overdrive, enabling clean response to input edges with rise times faster than 2ns. In practice, it reliably discriminates signals up to 100MHz sine-wave inputs and supports sampling rates exceeding 100MSPS in A/D converter trigger applications - provided layout follows high-speed guidelines (ground plane, local decoupling, short traces).
Does the MAX902ESD-T require external pull-up resistors on its output pins?
No. The MAX902ESD-T integrates internal TTL-compatible pull-up circuitry on all four outputs (pins 4, 5, 12, 13), allowing direct connection to LS-TTL loads with fan-out of four. External pull-ups are unnecessary and may degrade switching speed or cause contention if improperly sized.
Can the MAX902ESD-T operate from a single +5V supply, and how is the analog input range affected?
Yes. When VEE is tied to GND and VCC = +5V, the MAX902ESD-T operates in single-supply mode with input common-mode range from −0.1V to +2.75V - fully covering ground-referenced sensor outputs. This configuration maintains 8ns propagation delay and full latch functionality, making it suitable for portable and industrial sensor front-ends.
What is the purpose of the separate VDD and VCC/VEE supply pins on the MAX902ESD-T?
VDD (+5V) powers only the latch logic and output stage, while VCC/VEE (+5V/−5V or +5V/GND) powers the analog comparator core. This separation prevents digital switching noise on VDD from modulating the analog threshold, preserving offset stability and common-mode rejection - essential for precision timing in noisy mixed-signal environments.
Is the MAX902ESD-T still recommended for new designs, and what is the official guidance from Maxim?
No. Maxim explicitly states "Not Recommended for New Designs" due to discontinuation of the original wafer process. The MAX902ESD-T remains available for existing designs and legacy support, but Maxim recommends the pin-compatible MAX9202ESA+ for new projects - offering identical speed and SO-14 packaging with 50% lower power consumption and improved long-term supply assurance.
MAX902ESD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- with Latch
- Number of Elements:
- 2
- Output Type:
- TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 10V, ±2.5V ~ 5V
- :
- 4mV @ ±5V
- Voltage - Input Offset (Max):
- 10µA @ ±5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 8mA, 6mA, 3mA
- Current - Quiescent (Max):
- 82.5dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
MAX902ESD-T FAQ
1.How can I place an order for MAX902ESD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX902ESD-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 MAX902ESD-T reliable?
The price and inventory of MAX902ESD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX902ESD-T is usually 5 days.
3.What payment methods are accepted for MAX902ESD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX902ESD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX902ESD-T?
MAX902ESD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX902ESD-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 MAX902ESD-T?
For technical support, including MAX902ESD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX902ESD-T requirements.
6.How does Aetrix verify that MAX902ESD-T is sourced from the original manufacturer or authorized distributors?
All MAX902ESD-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 MAX902ESD-T meets industry standards.
7.What is the process for return or replacement of MAX902ESD-T?
All MAX902ESD-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX902ESD-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 MAX902ESD-T part is unused and in its original packaging.
Return procedure for MAX902ESD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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