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Analog Devices Inc./Maxim Integrated MAX908CSD+T
- Part No.:
- MAX908CSD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX908CSD+T.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,827
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Product details
Overview
MAX908CSD+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 timing-critical 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, enabling ground-referenced sensing in +5V systems.
For engineers reviewing the MAX908CSD+T datasheet, MAX908CSD+T pinout, MAX908CSD+T application, or MAX908CSD+T equivalent, key selection criteria include propagation delay consistency across channels, internal hysteresis eliminating external feedback components, TTL-compatible outputs without pull-ups, and SO-14 package compatibility with automated PCB assembly for compact, low-power signal conditioning designs.
Technical Context
The MAX908CSD+T integrates four independent comparators on a bipolar process, each featuring fixed internal hysteresis (≈5mV input-referred) to prevent oscillation during slow or noisy input transitions. Its TTL-compatible outputs drive directly into standard logic loads without external pull-up resistors, simplifying interface design.
All inputs and outputs are short-circuit protected to either rail, and the device supports continuous operation with inputs driven to GND or V+. The SO-14 package provides thermal performance suitable for industrial temperature range (0°C to +70°C) operation without derating below +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 40ns typical (5mV input overdrive); enables sampling at >10MHz rates in high-speed A/D front-ends |
| Supply Current per Comparator | 700µA at V+ = 5V (3.5mW); supports multi-comparator designs in sub-5mA total system power budgets |
| Input Common-Mode Range | –0.2V to V+–1.5V; allows direct sensing of signals referenced to ground or near-rail voltages |
| Input Offset Voltage | 1mV typical (3.5mV max); ensures accurate trip-point stability for precision threshold detection |
| Output Type | TTL-compatible push-pull; eliminates need for external pull-up resistors and reduces BOM count |
| Hysteresis | Internal, fixed ≈5mV (input-referred); prevents chatter on slow-moving or noisy inputs without external components |
| Operating Supply Range | +4.5V to +5.5V single supply only; not rated for ±5V operation (unlike MAX909) |
Pinout & Package
MAX908CSD+T is housed in a 14-pin SO (Small Outline) package, 150 mil width, with standard JEDEC MS-012AC footprint and gull-wing leads. Thermal resistance θJA is 8.33mW/°C above +70°C (667mW max at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply input; must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin |
| 2 | INA− | Inverting input of comparator A; differential pair input node with 200nA typical bias current |
| 3 | INA+ | Noninverting input of comparator A; matched to INA− for <3.5mV offset voltage |
| 4 | GND | Analog/digital ground reference; requires low-inductance connection to PCB ground plane |
| 5 | INB+ | Noninverting input of comparator B; electrically identical to INA+ with same CMR and offset specs |
| 6 | INB− | Inverting input of comparator B; shares same internal hysteresis structure as INA− |
| 7 | OUTB | Push-pull TTL output of comparator B; sinks ≥3.2mA or sources ≥100µA at valid logic levels |
| 8 | OUTA | Push-pull TTL output of comparator A; compatible with 74LS, 74F, and microcontroller GPIO inputs |
| 9 | INC− | Inverting input of comparator C; part of quad-channel set with matched AC/DC performance |
| 10 | INC+ | Noninverting input of comparator C; supports identical hysteresis and trip-point behavior as other channels |
| 11 | GND | Second ground terminal; internally tied to pin 4; improves noise immunity in high-density layouts |
| 12 | IND+ | Noninverting input of comparator D; completes full quad functionality with independent input pairs |
| 13 | IND− | Inverting input of comparator D; validated for continuous short-circuit to V+ or GND without damage |
| 14 | OUTD | TTL output of comparator D; maintains 40ns propagation delay matching within 2ns skew vs. other outputs |
Key Features
| Feature | Design Value |
|---|---|
| Quad comparator integration | Four independent, matched comparators in one SO-14 package-reduces board area and interconnect complexity vs. discrete solutions |
| Fixed internal hysteresis | ≈5mV input-referred hysteresis eliminates need for external positive feedback resistors and associated layout sensitivity |
| TTL-compatible outputs | True push-pull outputs drive standard TTL loads directly-no pull-up resistors required, reducing component count and power loss |
| Rail-to-rail input capability | Inputs operate down to –0.2V (below GND) and up to V+–1.5V-enables ground-referenced thresholding in +5V systems |
| Short-circuit robustness | All inputs and outputs withstand continuous shorting to V+ or GND-simplifies ESD protection and fault-tolerant design |
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 providing simultaneous undervoltage lockout (UVLO), critical warning, and safe-shutdown triggers. Use Value: 700µA per channel enables 4-channel monitoring within 3mA total quiescent budget; internal hysteresis prevents false triggering during gradual discharge. |
Use Scenario: Converting analog sensor outputs to digital pulses for flash ADC sampling in test equipment. IC Role / Device Role / Timing Role: High-speed comparator generating precise clock-synchronized decision edges before digitization. Use Value: 40ns propagation delay ensures ≤25MHz sampling fidelity; matched channel skew (<2ns) preserves multi-bit timing integrity. |
| Line Receiver for Industrial Serial Links | Zero-Crossing Detector in Power Supplies |
Use Scenario: Receiving RS-422/RS-485 differential signals in factory automation controllers with limited supply headroom. IC Role / Device Role / Timing Role: Single-supply comparator converting differential line signals to clean TTL logic levels. Use Value: Input common-mode range extending to –0.2V accommodates receiver offsets; TTL outputs interface directly with FPGA I/O banks. |
Use Scenario: Detecting AC mains zero-crossing for phase-controlled dimming or synchronous rectification in offline SMPS. IC Role / Device Role / Timing Role: Precision comparator comparing transformer-derived sine wave against ground reference. Use Value: Low 1mV offset voltage minimizes timing jitter; internal hysteresis rejects noise-induced false crossings near zero crossing point. |
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 per comparator), no internal hysteresis, open-collector outputs requiring pull-ups | Suitable for cost-sensitive, non-timing-critical level detection where speed and power are secondary | Select LM339DR only when 40ns timing is unnecessary and board space allows external pull-up resistors |
| TLV3704IPW | Lower power (800nA per comparator), rail-to-rail inputs, but slower (6µs delay), CMOS output (not TTL), no internal hysteresis | Better for ultra-low-power battery monitoring where microsecond response suffices and logic interface is CMOS-compatible | Choose TLV3704IPW only if µA-level quiescent current outweighs speed and TTL compatibility requirements |
Compared with LM339DR and TLV3704IPW, the MAX908CSD+T uniquely combines TTL output drive, 40ns speed, internal hysteresis, and 700µA/channel consumption-making it irreplaceable in compact, high-speed, single-supply threshold detection where timing accuracy and BOM simplicity are critical.
Availability
MAX908CSD+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-speed data acquisition front-ends, and industrial line receiver designs requiring stable component supply and long-term manufacturability support.
Supply support for MAX908CSD+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 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, ultra-low-power comparator applications-targeting portable systems, precision measurement, and timing-critical signal conditioning where speed, power, and ease of use converge.
FAQ
What is the operating temperature range for MAX908CSD+T?
The MAX908CSD+T is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its "C" suffix designation and is validated across all electrical parameters including propagation delay, offset voltage, and supply current. The SO-14 package's thermal characteristics support reliable operation without derating up to +70°C.
Does MAX908CSD+T support dual ±5V supplies?
No, MAX908CSD+T supports only single-supply operation from +4.5V to +5.5V. Dual-supply capability (±5V) is exclusive to the MAX909 variant. Attempting to apply negative voltage to the V− pin of MAX908CSD+T violates absolute maximum ratings and may cause permanent damage. Its GND pin serves as the sole reference for both analog and digital sections.
Can MAX908CSD+T outputs drive standard TTL logic inputs directly?
Yes, MAX908CSD+T outputs are fully TTL-compatible push-pull drivers. Each output guarantees VOH ≥ 2.8V (at ISOURCE = 100µA) and VOL ≤ 0.55V (at ISINK = 3.2mA), meeting standard TTL voltage thresholds without external pull-up resistors. This eliminates additional components and simplifies interface design with legacy or FPGA-based TTL logic.
Is internal hysteresis present on all four comparators in MAX908CSD+T?
Yes, internal hysteresis is implemented identically across all four comparators in the MAX908CSD+T. The datasheet specifies a fixed input-referred hysteresis width of approximately 5mV, derived from the difference between positive and negative trip points (VTRIP+ and VTRIP−). This eliminates the need for external hysteresis networks and ensures consistent noise immunity on every channel.
What is the maximum capacitive load the MAX908CSD+T outputs can drive while maintaining 40ns propagation delay?
The MAX908CSD+T maintains its 40ns typical propagation delay with CL = 10pF, as tested in the datasheet. Performance degrades gradually with increasing load: delay increases to ~50ns at 15pF and ~70ns at 50pF. For designs requiring guaranteed 40ns timing, keep total output capacitance-including PCB trace and destination input-below 15pF, and use short, direct routing with minimal stubs.
MAX908CSD+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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
MAX908CSD+T FAQ
1.How can I place an order for MAX908CSD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX908CSD+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 MAX908CSD+T reliable?
The price and inventory of MAX908CSD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX908CSD+T is usually 5 days.
3.What payment methods are accepted for MAX908CSD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX908CSD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX908CSD+T?
MAX908CSD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX908CSD+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 MAX908CSD+T?
For technical support, including MAX908CSD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX908CSD+T requirements.
6.How does Aetrix verify that MAX908CSD+T is sourced from the original manufacturer or authorized distributors?
All MAX908CSD+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 MAX908CSD+T meets industry standards.
7.What is the process for return or replacement of MAX908CSD+T?
All MAX908CSD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX908CSD+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 MAX908CSD+T part is unused and in its original packaging.
Return procedure for MAX908CSD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX908CSD+T Tags
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LM2903DR
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LM339DR
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LM393DR
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LM239DR
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LM2903P
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LM393ADR
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NCX2200GMAZ
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