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Analog Devices Inc./Maxim Integrated MAX908CSD+
- Part No.:
- MAX908CSD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX908CSD+.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:287
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Product details
Overview
MAX908CSD+ 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 timing 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-referenced sensing in +5V systems.
For engineers reviewing the MAX908CSD+ datasheet, MAX908CSD+ pinout, MAX908CSD+ application, or MAX908CSD+ equivalent, key selection criteria include guaranteed 40ns propagation delay at low power, internal hysteresis eliminating external components, TTL-compatible outputs without pull-ups, robust short-circuit protection, and SO-14 packaging suitable for space-constrained industrial and portable designs.
Technical Context
The MAX908CSD+ implements four independent comparators in a single bipolar process, each featuring built-in hysteresis (≈5mV input-referred) to prevent oscillation during slow or noisy input transitions. Its architecture supports rail-to-rail input operation down to –0.2V (below GND) and up to V+–1.5V, with TTL-level outputs switching between 0.4V (low) and 3.5V (high) under defined load conditions.
Unlike the MAX909, the MAX908CSD+ lacks complementary outputs, latch functionality, or negative supply support - it is strictly a quad comparator optimized for single +5V operation. Propagation delay skew between channels is limited to 2ns (typ), and differential propagation delay across comparators is ≤2ns, ensuring tight timing alignment in multi-channel sampling or window-detection applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 40ns typical (5mV overdrive): enables reliable sampling at >10MHz clock rates in A/D front-ends. |
| Supply Current per Comparator | 700µA at V+ = 5V: total 2.8mA quiescent draw for all four comparators - ideal for battery life-critical systems. |
| Input Common-Mode Range | –0.2V to V+–1.5V: accepts inputs below ground and up to 3.5V on +5V supply - supports direct connection to transducer outputs without level-shifting. |
| Output Type | TTL-compatible (no pull-up required): drives standard 74LS logic directly; VOL = 0.475V @ 3.2mA sink ensures noise margin compliance. |
| Input Offset Voltage | 1mV typical (3.5mV max): enables accurate threshold detection within ±2mV windows, critical for precision discriminators. |
| Hysteresis Width | ≈5mV (input-referred): suppresses chatter on slow-moving or noisy signals without external feedback resistors. |
| Operating Supply Range | +4.5V to +5.5V: compatible with regulated +5V rails and tolerates standard USB or LDO output variation. |
Pinout & Package
MAX908CSD+ is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm wide, with standard 1.27mm pitch and gull-wing leads. The package is RoHS-compliant and rated for 0°C to +70°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply input: must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin for stable high-speed operation. |
| 2 | INA− | Inverting input of comparator A: differential pair input referenced to INA+; accepts voltages from –0.2V to V+–1.5V. |
| 3 | INA+ | Noninverting input of comparator A: primary signal input for comparator A; hysteresis centered around trip point. |
| 4 | GND | Analog/digital ground reference: requires low-inductance connection to PCB ground plane to minimize noise coupling. |
| 5 | INB+ | Noninverting input of comparator B: electrically identical to INA+, supports independent dual-threshold configurations. |
| 6 | INB− | Inverting input of comparator B: matched to INB+ for consistent offset and delay performance across channels. |
| 7 | OUTB | Output of comparator B: TTL-compatible open-collector-equivalent output; sinks up to 8mA, sources ~100µA. |
| 8 | OUTA | Output of comparator A: active-low when INA− > INA+; no external pull-up needed due to internal totem-pole driver. |
| 9 | INC− | Inverting input of comparator C: shares same electrical specs as INA−/INB−; supports cascaded or parallel comparison topologies. |
| 10 | INC+ | Noninverting input of comparator C: enables three independent threshold comparisons on single device. |
| 11 | GND | Second ground pin: tied internally to Pin 4; improves thermal dissipation and reduces ground bounce in high-speed switching. |
| 12 | IND+ | Noninverting input of comparator D: completes quad configuration; allows simultaneous monitoring of four distinct analog thresholds. |
| 13 | IND− | Inverting input of comparator D: matched performance ensures channel-to-channel consistency in multi-window detectors. |
| 14 | OUTD | Output of comparator D: fully buffered TTL output; identical drive strength and voltage levels to OUTA–OUTC. |
Key Features
| Feature | Design Value |
|---|---|
| 40ns propagation delay | Enables real-time response in high-speed sampling circuits (e.g., >10MSPS flash ADC references) without added latency. |
| Internal hysteresis (~5mV) | Eliminates need for external positive feedback resistors - reduces BOM count, layout area, and design iteration time. |
| TTL-compatible outputs | Drives 74LS/ALS logic directly; avoids external pull-up resistors and associated power waste or timing uncertainty. |
| Input/output short-circuit protection | Withstands continuous shorting to V+ or GND - enhances reliability in test fixtures, ESD-prone environments, and fault-tolerant designs. |
| Wide input common-mode range (–0.2V to V+–1.5V) | Accepts ground-referenced sensor outputs (e.g., thermocouples, current shunts) without level-shifting circuitry. |
| Ultra-low power (3.5mW/comparator) | Supports always-on monitoring in portable medical devices and IoT edge nodes with multi-year battery life. |
Applications
| High-Speed A/D Converter Front-End | Battery-Powered Threshold Detection |
|---|---|
Use Scenario: Comparing sampled analog signals against reference voltages prior to digitization in flash or pipeline ADC architectures. IC Role / Device Role / Timing Role: Quad comparator providing parallel decision logic for multi-bit conversion; propagation delay and skew directly limit maximum sampling rate. Use Value: 40ns delay and ≤2ns skew enable synchronous 10+ MSPS sampling; internal hysteresis prevents metastability in presence of input noise. |
Use Scenario: Monitoring battery voltage, temperature, or sensor thresholds in handheld instruments and wearables. IC Role / Device Role / Timing Role: Low-quiescent-current threshold detector triggering wake-up or alert signals when parameters exceed safe limits. Use Value: 2.8mA total supply current extends coin-cell or Li-ion battery life to multi-year operation; rail-to-rail input accommodates direct sensor interfacing. |
| Line Receiver with Noise Immunity | Zero-Crossing Detector for AC Sensing |
Use Scenario: Receiving digital signals over noisy cables or PCB traces where EMI induces jitter or false transitions. IC Role / Device Role / Timing Role: High-speed comparator converting degraded differential or single-ended signals into clean TTL logic levels. Use Value: Internal hysteresis rejects sub-5mV noise spikes; 40ns response preserves signal integrity up to 10MHz data rates. |
Use Scenario: Detecting AC waveform zero crossings in motor control, power metering, or lighting dimming circuits. IC Role / Device Role / Timing Role: Precision comparator comparing AC input against 0V reference to generate synchronized timing pulses. Use Value: Input range extending to –0.2V enables true ground-referenced zero-crossing detection without biasing networks. |
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 propagation delay), higher supply current (500µA/comparator), no internal hysteresis, wider supply range (2V–36V). | Suitable for low-speed, high-voltage industrial monitoring but cannot replace MAX908CSD+ in >1MHz timing-critical roles. | Select LM339DR only when cost sensitivity outweighs speed/power requirements and external hysteresis can be added. |
| TLV3704IPW | Lower power (800nA/comparator), rail-to-rail input, but slower (5.5µs delay); CMOS process vs. MAX908CSD+'s bipolar. | Preferred for nano-power battery applications where speed <100kHz suffices; unsuitable for high-speed sampling or line reception. | Choose TLV3704IPW for ultra-low-power, low-frequency thresholding; avoid where propagation delay <100ns is required. |
Compared with LM339DR and TLV3704IPW, the MAX908CSD+ uniquely balances nanosecond-speed response, micropower consumption, and integrated hysteresis - making it irreplaceable in compact, battery-operated, high-sample-rate systems where board space and timing fidelity are constrained.
Availability
MAX908CSD+ is available at Aetrix Electronics and suitable for battery-powered systems, high-speed A/D converters, and line receivers requiring stable component supply, long-term manufacturability assurance, and traceable sourcing for industrial and medical OEM programs.
Supply support for MAX908CSD+ 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 applications.
The MAX907/MAX908/MAX909 family was engineered specifically for single-supply, high-speed comparator applications demanding ultra-low power, fast propagation, and ease of use - targeting portable instrumentation, data acquisition, and real-time control systems.
FAQ
What is the operating temperature range for MAX908CSD+?
The MAX908CSD+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its "C" suffix designation and suits indoor industrial controls, test equipment, and consumer electronics where thermal management is controlled. It is not rated for extended industrial (–40°C to +85°C) or military ranges.
Does MAX908CSD+ support dual-supply operation like the MAX909?
No, the MAX908CSD+ does not support dual-supply operation. Unlike the MAX909, it is designed exclusively for single +4.5V to +5.5V supply use. Its input common-mode range extends to –0.2V (below ground) but does not accommodate a negative supply rail; V– is not a functional pin on the MAX908CSD+.
Can MAX908CSD+ drive standard TTL loads directly?
Yes, MAX908CSD+ features TTL-compatible outputs that source up to 100µA and sink up to 8mA while maintaining VOH ≥ 2.8V and VOL ≤ 0.475V. This meets 74LS logic thresholds without external pull-up resistors - simplifying interface design and reducing power loss in driving multiple gate inputs.
Is internal hysteresis present on all four comparators in MAX908CSD+?
Yes, each of the four comparators in the MAX908CSD+ includes identical, fixed internal hysteresis (~5mV input-referred). This eliminates the need for external feedback networks and ensures consistent noise immunity across all channels - critical for multi-threshold detection and window-comparator topologies.
What package type is used for MAX908CSD+?
MAX908CSD+ uses a 14-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm body width, with 1.27mm lead pitch and RoHS-compliant finish. This surface-mount package supports automated assembly and provides better thermal performance than plastic DIP variants while occupying minimal PCB area.
MAX908CSD+ 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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
MAX908CSD+ FAQ
1.How can I place an order for MAX908CSD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX908CSD+ 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 MAX908CSD+ reliable?
The price and inventory of MAX908CSD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX908CSD+ is usually 5 days.
3.What payment methods are accepted for MAX908CSD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX908CSD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX908CSD+?
MAX908CSD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX908CSD+ 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 MAX908CSD+?
For technical support, including MAX908CSD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX908CSD+ requirements.
6.How does Aetrix verify that MAX908CSD+ is sourced from the original manufacturer or authorized distributors?
All MAX908CSD+ 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 MAX908CSD+ meets industry standards.
7.What is the process for return or replacement of MAX908CSD+?
All MAX908CSD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX908CSD+, 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 MAX908CSD+ part is unused and in its original packaging.
Return procedure for MAX908CSD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX908CSD+ Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
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LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
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LM2901PWR
Texas Instruments
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LM2903DT
STMicroelectronics
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LM393DR
Texas Instruments
-
LM239DR
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LM339APWR
Texas Instruments
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LM2903P
Texas Instruments
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LM393ADR
Texas Instruments
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NCX2200GMAZ
NXP USA Inc.
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