My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX908ESD+T
- Part No.:
- MAX908ESD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX908ESD+T.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,978
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX908ESD+T from Maxim Integrated is a quad, high-speed, ultra-low-power, single-supply TTL comparator IC designed for precision threshold detection in battery-powered and high-speed signal conditioning systems. It delivers 40ns propagation delay (5mV overdrive), 700µA per comparator supply current (3.5mW), and operates from a single +4.5V to +5.5V supply. Its input common-mode range extends from –0.2V to V+–1.5V, and outputs are TTL-compatible without external pullups.
For engineers reviewing the MAX908ESD+T datasheet, MAX908ESD+T pinout, MAX908ESD+T application, or MAX908ESD+T equivalent, key selection considerations include propagation delay consistency across channels, internal hysteresis for noise immunity, rail-to-rail input capability near ground, and SO-14 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX908ESD+T implements four independent comparators in a single monolithic bipolar process, each featuring built-in hysteresis to eliminate oscillation during slow or noisy input transitions. Its architecture supports fast decision-making with differential propagation delay ≤2ns and skew ≤4ns across channels under full temperature range (–40°C to +85°C).
All inputs and outputs tolerate continuous short-circuit to either supply rail. The device lacks latch or complementary output functionality-features exclusive to the MAX909 variant-making it strictly a quad, non-latching, single-ended TTL comparator optimized for deterministic, low-power timing decisions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 40ns typical (5mV overdrive); enables sampling at >10MHz in high-speed A/D front-ends. |
| Supply Current per Comparator | 700µA at V+ = 5V; total 2.8mA quiescent draw for all four channels-critical for battery life. |
| Input Common-Mode Range | –0.2V to V+–1.5V; accepts signals down to 200mV below ground, supporting true ground-referenced thresholds. |
| Input Offset Voltage | 1mV typical (max 3.5mV); ensures accurate trip-point stability across temperature and supply variation. |
| Output Type | TTL-compatible open-collector-equivalent (no pullup required); drives standard logic loads directly. |
| Power Supply Range | +4.5V to +5.5V only; not dual-supply capable-simplifies power design but excludes ±5V operation. |
| Hysteresis | Internal, fixed; eliminates need for external feedback resistors and associated layout sensitivity. |
Pinout & Package
MAX908ESD+T is housed in a 14-pin SO (Small Outline) package, 150 mil width, with standard JEDEC MS-012AC footprint and gull-wing leads. Pin 1 is marked by a dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive supply input | Accepts +4.5V to +5.5V; must be decoupled locally with 0.1µF ceramic capacitor. |
| 2 (INA+) | Comparator A noninverting input | Differential pair input; referenced to GND or other analog node within common-mode range. |
| 3 (INA–) | Comparator A inverting input | Paired with INA+; hysteresis applied internally between these pins. |
| 4 (GND) | Ground reference | System return path; requires low-inductance connection to PCB ground plane. |
| 5 (INB+) | Comparator B noninverting input | Independent channel; electrically identical to INA+ in performance and biasing. |
| 6 (INB–) | Comparator B inverting input | Paired with INB+; no crosstalk coupling to other comparator inputs. |
| 7 (OUTB) | Comparator B TTL output | Active-low compatible; sinks ≥3.2mA at VOL ≤0.55V (–40°C). |
| 8 (OUTA) | Comparator A TTL output | Matches OUTB drive strength and logic thresholds; shares no internal load sharing. |
| 9 (INC–) | Comparator C inverting input | Third independent channel input; identical electrical specs to INA–/INB–. |
| 10 (INC+) | Comparator C noninverting input | Third channel positive input; fully isolated from A/B channel signal paths. |
| 11 (GND) | Ground reference (second pin) | Redundant ground terminal; improves thermal and noise performance in SO-14 layout. |
| 12 (IND+) | Comparator D noninverting input | Fourth channel input; completes quad configuration with matched offset and delay. |
| 13 (IND–) | Comparator D inverting input | Final comparator input pair; validated for simultaneous operation with all other channels. |
| 14 (OUTD) | Comparator D TTL output | Fourth output; maintains <4ns skew vs. OUTA under same load and temperature conditions. |
Key Features
| Feature | Design Value |
|---|---|
| 40ns propagation delay | Enables reliable sampling of 10MHz+ signals without added timing margin or external latching. |
| Internal hysteresis | Eliminates external resistor networks and layout-dependent noise susceptibility in threshold detection. |
| TTL-compatible outputs | Drives standard 74LS/74HC logic directly-no pullup resistors, reducing BOM count and board area. |
| Rail-to-rail input capability | Accepts inputs down to –0.2V, enabling precise zero-crossing and ground-referenced sensing. |
| Short-circuit protected I/O | Withstands continuous short to V+ or GND-improves robustness in test, debug, and fault-prone environments. |
Applications
| Battery-Powered Threshold Detection | High-Speed A/D Converter Front-End |
|---|---|
Use Scenario: Monitoring battery voltage against multiple low-power cutoff thresholds in portable medical devices. IC Role / Device Role / Timing Role: Quad comparator simultaneously checks VBAT against 3.3V, 3.0V, 2.7V, and 2.5V reference levels using resistor dividers. Use Value: 2.8mA total supply current extends runtime; internal hysteresis prevents chatter during gradual discharge near trip points. |
Use Scenario: Providing clock-synchronized window comparisons in flash-type ADCs sampling at 20MSPS. IC Role / Device Role / Timing Role: Four parallel comparators digitize analog input against successive reference voltages in pipeline stages. Use Value: 40ns delay ensures setup/hold timing margins are met; matched channel skew (<4ns) preserves conversion linearity. |
| Line Receiver with Noise Immunity | Zero-Crossing Detector for AC Sensing |
Use Scenario: Receiving TTL-level serial data over long cables subject to EMI in industrial control networks. IC Role / Device Role / Timing Role: One comparator channel acts as a Schmitt-trigger line receiver, rejecting common-mode noise on RS-422/485 lines. Use Value: Fixed hysteresis rejects sub-5mV noise spikes; 40ns response allows >10Mbps data recovery without external filtering. |
Use Scenario: Detecting AC mains zero crossings in smart energy meters for phase-aligned sampling and relay control. IC Role / Device Role / Timing Role: Comparator compares transformer-derived AC signal against ground reference with hysteresis to suppress ringing. Use Value: Input range extending to –0.2V accommodates negative half-cycle without level-shifting; 1mV offset minimizes timing jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339DR | Slower (1.3µs delay), higher supply current (500µA per comparator), no internal hysteresis, wider supply range (2–36V). | Suitable for general-purpose, low-speed, multi-voltage industrial comparators-not for high-speed or battery-critical designs. | Select LM339DR only when cost is primary and speed/power are secondary; verify external hysteresis design. |
| TLV3704IPW | CMOS input (pA bias), rail-to-rail I/O, 1.5µs delay, 85µA per comparator-but requires external pullups and has no internal hysteresis. | Better for ultra-low-power sensor interfaces where speed <100kHz suffices; unsuitable for TTL-driven logic or fast edge detection. | Choose TLV3704IPW for microamp-level systems with clean signals; avoid where TTL compatibility or 40ns timing is mandatory. |
Compared with LM339DR and TLV3704IPW, the MAX908ESD+T uniquely combines TTL output drive, internal hysteresis, 40ns speed, and 700µA/channel consumption-making it irreplaceable in compact, high-speed, single-5V threshold detection where timing determinism and noise immunity are co-required.
Availability
MAX908ESD+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-speed data acquisition, and industrial line receiver designs requiring stable component supply and long-term obsolescence management.
Supply support for MAX908ESD+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX907/MAX908/MAX909 family was engineered specifically for single-supply, high-speed comparator applications demanding ultra-low power, TTL compatibility, and integrated hysteresis-targeting portable and precision measurement systems.
FAQ
What is the operating temperature range for MAX908ESD+T?
The MAX908ESD+T is rated for operation from –40°C to +85°C. This extended industrial temperature range ensures reliable performance in automotive cabin modules, outdoor industrial sensors, and portable test equipment exposed to ambient thermal cycling. All key specifications-including propagation delay, offset voltage, and supply current-are guaranteed across this full range.
Does MAX908ESD+T support dual ±5V supplies?
No, the MAX908ESD+T operates exclusively from a single +4.5V to +5.5V supply. Dual-supply capability (±5V) is provided only in the MAX909 variant. Attempting to apply negative voltage to V– or GND on the MAX908ESD+T violates absolute maximum ratings and may cause permanent damage. Its input common-mode range extends to –0.2V relative to GND, but no negative rail is required or supported.
Is MAX908ESD+T pin-compatible with other devices in the MAX907/MAX908/MAX909 family?
Yes, the MAX908ESD+T uses the same 14-pin SO package and identical pinout as the MAX908CPD, MAX908CSD, and MAX908EPD variants. All share identical pin functions: V+, INA+, INA–, GND, INB+, INB–, OUTB, OUTA, INC–, INC+, GND, IND+, IND–, and OUTD. However, it is not pin-compatible with the 8-pin MAX907 or MAX909, which have different channel counts and pin assignments.
Can MAX908ESD+T outputs drive standard TTL logic directly?
Yes, MAX908ESD+T outputs are fully TTL-compatible: VOH ≥2.8V (at ISOURCE = 100µA) and VOL ≤0.55V (at ISINK = 3.2mA, –40°C). No external pullup resistors are needed. Each output can sink ≥3.2mA, meeting LS-TTL fanout requirements (10x 74LS inputs) without additional buffering-reducing component count and layout complexity.
Why does the datasheet state "Not Recommended for New Designs" for MAX908ESD+T?
The "Not Recommended for New Designs" notice applies to the entire MAX907/MAX908/MAX909 family due to discontinuation of the legacy bipolar wafer process used to manufacture them. While MAX908ESD+T remains available through authorized distributors and Aetrix Electronics' legacy inventory, Maxim recommends evaluating modern alternatives like the MAX9021 or AD8611 for new projects-though none replicate its exact combination of 40ns delay, internal hysteresis, and TTL drive in a quad SO-14 package.
MAX908ESD+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:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- TTL
- Voltage - Supply, Single/Dual (±):
- 4.5V ~ 11V
- :
- 2mV @ 5V
- Voltage - Input Offset (Max):
- 0.3µA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 1mA
- Current - Quiescent (Max):
- 86.02dB CMRR, 86.02dB PSRR
- CMRR, PSRR (Typ):
- 50ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
MAX908ESD+T FAQ
1.How can I place an order for MAX908ESD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX908ESD+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 MAX908ESD+T reliable?
The price and inventory of MAX908ESD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX908ESD+T is usually 5 days.
3.What payment methods are accepted for MAX908ESD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX908ESD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX908ESD+T?
MAX908ESD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX908ESD+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 MAX908ESD+T?
For technical support, including MAX908ESD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX908ESD+T requirements.
6.How does Aetrix verify that MAX908ESD+T is sourced from the original manufacturer or authorized distributors?
All MAX908ESD+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 MAX908ESD+T meets industry standards.
7.What is the process for return or replacement of MAX908ESD+T?
All MAX908ESD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX908ESD+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 MAX908ESD+T part is unused and in its original packaging.
Return procedure for MAX908ESD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX908ESD+T Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP USA Inc.
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
