My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX908ESD+
- Part No.:
- MAX908ESD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX908ESD+.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,208
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX908ESD+ 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 timing-critical systems. It delivers 40ns propagation delay with 5mV overdrive, consumes only 700µA per comparator (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, enabling ground-sensing operation in +5V systems.
For engineers reviewing the MAX908ESD+ datasheet, MAX908ESD+ pinout, MAX908ESD+ application, or MAX908ESD+ equivalent, key selection considerations include its quad-channel TTL-compatible outputs (no pull-ups required), built-in hysteresis for noise immunity, input/output short-circuit robustness, and SO-14 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX908ESD+ implements four independent bipolar comparators with internal hysteresis-eliminating external feedback resistors-and TTL-level output stages that sink/source sufficient current for direct logic interfacing. Each channel features matched propagation delay (tPD+ and tPD−) and low skew (≤2ns typical), critical for synchronous sampling and high-speed A/D front-ends.
Its input stage supports rail-to-rail common-mode operation down to –0.2V (relative to GND) and up to V+–1.5V, enabling accurate zero-crossing and low-voltage threshold detection without level-shifting. All inputs and outputs tolerate continuous short-circuit to either supply rail, enhancing system reliability in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 40ns typical (5mV overdrive); enables >10MHz sampling rate in discriminators and line receivers |
| Supply Current per Comparator | 700µA at V+ = 5V; total 2.8mA for all four channels - ideal for battery life-critical designs |
| Input Common-Mode Range | –0.2V to V+–1.5V; supports ground-referenced sensing and eliminates need for negative bias rails |
| Input Offset Voltage | 1mV typical (3.5mV max); ensures sub-millivolt trip-point accuracy across temperature |
| Output Type | TTL-compatible push-pull; drives standard 74LS loads directly without external pull-up resistors |
| Hysteresis | Internal, fixed (~5mV input-referred); prevents chatter on slow-moving or noisy signals without external components |
| Operating Supply | +4.5V to +5.5V single supply only; not rated for dual ±5V (unlike MAX909) |
Pinout & Package
MAX908ESD+ is housed in a 14-pin SOIC (SO-14) surface-mount package, 8.65mm × 3.90mm footprint, 1.75mm height, with standard 1.27mm pitch and gull-wing leads.
| 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 inverting input | Differential input pair for first comparator; referenced to INA+ for threshold decision |
| 3 (INA+) | Comparator A noninverting input | Primary signal input for comparator A; hysteresis centered around this node |
| 4 (GND) | Circuit ground reference | Return path for supply and signal; requires low-inductance ground plane for high-speed stability |
| 5 (INB+) | Comparator B noninverting input | Second comparator's signal input; electrically isolated but thermally coupled to other channels |
| 6 (INB−) | Comparator B inverting input | Second comparator's reference input; matches INA−/INA+ electrical characteristics |
| 7 (OUTB) | Comparator B TTL output | Active-low compatible output; sinks ≥8mA at VOL ≤0.475V (ISINK = 3.2mA) |
| 8 (OUTA) | Comparator A TTL output | Matches OUTB drive strength and logic thresholds; fully interchangeable in layout |
| 9 (INC−) | Comparator C inverting input | Third comparator input pair; identical DC and AC specs to INA−/INA+ |
| 10 (INC+) | Comparator C noninverting input | Third comparator signal input; supports same input voltage range and hysteresis behavior |
| 11 (GND) | Secondary ground connection | Shared ground pin with Pin 4; improves thermal dissipation and reduces ground bounce |
| 12 (IND+) | Comparator D noninverting input | Fourth comparator input; completes quad functionality with matched propagation and offset |
| 13 (IND−) | Comparator D inverting input | Fourth comparator reference input; validated for simultaneous switching with <2ns skew |
| 14 (OUTD) | Comparator D TTL output | Final output; identical VOH/VOL specs ensure consistent logic interfacing across all four channels |
Key Features
| Feature | Design Value |
|---|---|
| 40ns propagation delay | Enables real-time response in high-speed V/F converters and A/D trigger circuits without added latency |
| 700µA per comparator supply current | Reduces total quiescent draw to 2.8mA - extends runtime in coin-cell or Li-ion portable systems |
| Internal hysteresis (~5mV) | Eliminates external resistor networks and design calculations while ensuring clean, chatter-free switching |
| TTL-compatible push-pull outputs | Drives 74LS logic directly; removes need for pull-up resistors and associated board area and power loss |
| Input range includes ground (–0.2V) | Supports true zero-crossing detection and low-threshold battery monitoring without level shifters |
| Short-circuit protected I/O | Withstands indefinite shorts to V+ or GND - increases field reliability in industrial sensor interfaces |
Applications
| Battery-Powered Threshold Detection | High-Speed Line Receiver |
|---|---|
Use Scenario: Monitoring lithium battery cell voltage during charging/discharging to trigger cutoff or alert at precise 3.0V and 4.2V thresholds. IC Role / Device Role / Timing Role: Quad comparator acting as independent voltage window detector - each channel compares one battery tap against a reference. Use Value: Ultra-low 2.8mA total supply current extends operational time between charges; internal hysteresis prevents false triggers from ripple-induced noise. |
Use Scenario: Converting differential RS-422 or LVDS-like signals into single-ended TTL logic for FPGA capture in data acquisition systems. IC Role / Device Role / Timing Role: High-speed comparator array converting analog line signals into clean digital edges with minimal jitter. Use Value: 40ns delay and <2ns channel-to-channel skew preserve timing integrity across multi-bit parallel lines. |
| Zero-Crossing Detector | High-Speed Sampling Circuit |
Use Scenario: Detecting AC mains zero crossings for phase-controlled dimmers or motor commutation in smart home controllers. IC Role / Device Role / Timing Role: Single comparator channel (e.g., INA+/INA−) configured with hysteresis to reject noise near 0V crossing point. Use Value: Input range extending to –0.2V allows direct connection to transformer-coupled AC signals without negative biasing. |
Use Scenario: Generating precise sample-enable pulses synchronized to analog input transitions in flash ADC front-ends. IC Role / Device Role / Timing Role: Comparator triggering sample-hold control logic based on input slew-rate crossing a defined threshold. Use Value: Matched propagation delay across all four channels enables deterministic timing alignment for multi-channel sampling. |
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 typ), higher supply current (250µA per comparator), no internal hysteresis, open-collector outputs requiring pull-ups | Suitable for low-speed, cost-sensitive industrial controls where timing and power are non-critical | Select LM339DR only if 40ns speed and 700µA/channel efficiency are unnecessary and board space allows pull-up resistors |
| TLV3704IPW | CMOS input (pA bias), rail-to-rail input, 1.5µs propagation, 85µA/channel, push-pull outputs, no internal hysteresis | Better for high-impedance sensor interfaces (e.g., pH probes), but lacks noise immunity and speed for fast edge detection | Choose TLV3704IPW when ultra-low input bias and wide input voltage range outweigh need for speed and built-in hysteresis |
Compared with LM339DR and TLV3704IPW, MAX908ESD+ uniquely combines TTL-speed (40ns), micropower operation (700µA/comparator), and factory-trimmed internal hysteresis - making it irreplaceable in compact, battery-powered, high-noise-margin threshold systems where timing predictability is essential.
Availability
MAX908ESD+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-speed data acquisition, and industrial sensor interface applications requiring stable component supply and long-term obsolescence management.
Supply support for MAX908ESD+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer markets.
The MAX907/MAX908/MAX909 family was engineered specifically for single-supply, high-speed comparator applications demanding both ultra-low power and TTL compatibility - targeting portable test equipment, precision data converters, and noise-prone sensor front-ends.
FAQ
What is the maximum operating supply voltage for MAX908ESD+?
The absolute maximum positive supply voltage (V+ to GND) for MAX908ESD+ is +6V, but the recommended operating range is +4.5V to +5.5V. Operation outside this range may degrade propagation delay, increase offset drift, or reduce long-term reliability. The device is not rated for negative supply operation - unlike the MAX909, MAX908ESD+ supports single-supply only.
Does MAX908ESD+ include internal hysteresis, and how does it affect threshold accuracy?
Yes, MAX908ESD+ incorporates fixed internal hysteresis (~5mV input-referred), eliminating the need for external feedback resistors. This hysteresis creates distinct upper (VTRIP+) and lower (VTRIP−) trip points, preventing oscillation on slow or noisy inputs. While it adds ~2.5mV uncertainty to the effective threshold center (VOS), the trade-off delivers robust switching without design overhead - confirmed in the datasheet Figure 1 and Note 1.
Can MAX908ESD+ drive standard TTL logic loads directly?
Yes, MAX908ESD+ features true TTL-compatible push-pull outputs capable of sinking ≥8mA at VOL ≤0.475V (ISINK = 3.2mA) and sourcing ≥100µA at VOH ≥2.8V. This allows direct interfacing with 74LS-series inputs without external pull-up resistors - a key differentiator from open-collector comparators like the LM339. Output drive strength is verified across temperature in the Electrical Characteristics table.
Is MAX908ESD+ pin-compatible with other devices in the MAX907/MAX908/MAX909 family?
MAX908ESD+ is pin-compatible with other MAX908 variants (e.g., MAX908CSD, MAX908EPD) in the same SO-14 or PDIP-14 packages. However, it is not pin-compatible with MAX907 (8-pin) or MAX909 (8-pin with latch/LE pins), due to differing channel count and pin functions. Always verify pin mapping using the "Pin Configurations" diagram on page 1 of the datasheet before substitution.
What is the input common-mode voltage range for MAX908ESD+, and why does it matter for ground-referenced signals?
The input common-mode voltage range for MAX908ESD+ is –0.2V to V+–1.5V (e.g., –0.2V to +3.5V at V+ = +5V). This allows direct connection of IN+ or IN− to circuit ground - essential for zero-crossing detection, battery voltage monitoring, and other ground-referenced threshold applications. Unlike many comparators that require input bias above GND, this spec enables simpler, lower-component-count designs.
MAX908ESD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX908ESD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX908ESD+ 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+ reliable?
The price and inventory of MAX908ESD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX908ESD+ is usually 5 days.
3.What payment methods are accepted for MAX908ESD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX908ESD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX908ESD+?
MAX908ESD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX908ESD+ 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+?
For technical support, including MAX908ESD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX908ESD+ requirements.
6.How does Aetrix verify that MAX908ESD+ is sourced from the original manufacturer or authorized distributors?
All MAX908ESD+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX908ESD+?
All MAX908ESD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX908ESD+, 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+ part is unused and in its original packaging.
Return procedure for MAX908ESD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX908ESD+ 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…
