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Analog Devices Inc./Maxim Integrated MAX903CSA+
- Part No.:
- MAX903CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX903CSA+.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
MAX903CSA+ from Maxim Integrated is a high-speed, low-power quad voltage comparator IC with differential analog inputs and TTL-logic outputs featuring active internal pull-ups. It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, supports separate analog/digital supplies (VCC/VEE and VDD), and includes independent TTL-compatible latch inputs for output hold functionality. It is used in high-speed A/D converters, line receivers, and PWM circuits.
For engineers reviewing the MAX903CSA+ datasheet, MAX903CSA+ pinout, MAX903CSA+ application, or MAX903CSA+ equivalent, key selection considerations include its 8ns propagation delay, ±5V or +5V single-supply operation capability, latch-enabled output retention, TTL-compatible I/O thresholds, and SO-8 package compatibility with space-constrained mixed-signal PCB layouts.
Technical Context
The MAX903CSA+ implements four independent high-gain comparators with rail-to-rail input common-mode range extending to the negative supply rail (VEE), enabling ground-sensing operation under single-supply conditions. Each channel features dedicated TTL-compatible latch inputs that freeze output states upon low assertion - a function absent in MAX901 but present in MAX900/MAX902/MAX903.
It operates with flexible supply configurations: analog supplies (VCC = +5V to +10V, VEE = −5V or GND) and fixed +5V digital supply (VDD). Input offset voltage is specified at 1–3mV over temperature, and output stages drive standard LS-TTL loads with VOH ≥ 2.4V and VOL ≤ 0.4V at 8mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 8ns typical at 5mV overdrive - enables sampling of >100MHz signals in A/D front-ends. |
| Power Dissipation | 18mW per comparator at +5V - supports thermally constrained multi-channel designs. |
| Input Common-Mode Range | Includes VEE (negative rail) - allows ground-referenced sensing with single +5V supply. |
| Output Type | TTL-compatible with active internal pull-up - eliminates external pull-up resistors in LS-TTL interfacing. |
| Latch Inputs | TTL-compatible (VLH = 1.4–2.0V, VLL = 0.8–1.4V) - enables synchronous capture of comparator decisions in digital control loops. |
| Supply Flexibility | VCC = +5V to +10V, VEE = −5V or GND, VDD = +5V - supports both split-rail precision and single-supply compact systems. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial and test equipment environments. |
Pinout & Package
MAX903CSA+ is housed in an 8-pin SO (Small Outline) package with exposed pad (SO-8), footprint compatible with JEDEC MS-012AC. Pin assignments are fully defined per Maxim's official pin configuration diagram for MAX903.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive analog supply input (+5V to +10V); powers comparator core and input stage. |
| 2 | IN+ | Non-inverting input of Channel A; accepts differential or single-ended analog signals. |
| 3 | IN− | Inverting input of Channel A; forms differential pair with Pin 2 for noise rejection. |
| 4 | VEE | Negative analog supply and substrate connection (−5V or GND); sets lower input common-mode limit. |
| 5 | LATCH | TTL-compatible latch enable for Channel A; low level freezes output state, high enables real-time comparison. |
| 6 | GND | Digital/analog reference ground; must be tied to system ground plane for stable TTL output switching. |
| 7 | OUT | TTL-output of Channel A; drives LS-TTL loads directly with VOH ≥ 2.4V and VOL ≤ 0.4V. |
| 8 | VDD | +5V digital supply; powers output buffer and latch logic - not adjustable. |
Key Features
| Feature | Design Value |
|---|---|
| 8ns propagation delay | Enables accurate timing capture in high-speed data acquisition systems sampling up to 125MSPS. |
| Independent latch inputs | Allows per-channel synchronous sampling without global clock distribution or external flip-flops. |
| Rail-inclusive input range | Supports direct interface to 0V-referenced sensors (e.g., current shunts, thermocouples) without level-shifting circuitry. |
| TTL-compatible outputs | Drives up to four LS-TTL loads without external pull-ups - reduces BOM count and layout area. |
| Separate analog/digital supplies | Minimizes digital switching noise coupling into analog inputs via independent VCC/VEE and VDD paths. |
Applications
| High-Speed A/D Converters | Line Receivers |
|---|---|
Use Scenario: Front-end threshold detection in flash or pipeline ADC architectures requiring sub-10ns decision latency. IC Role / Device Role / Timing Role: Quad comparator providing parallel analog-to-digital decision points with synchronized latching for sample-and-hold alignment. Use Value: 8ns propagation delay ensures minimal aperture uncertainty; latch inputs align digitization windows across all four channels. | Use Scenario: Differential signal recovery in RS-422/RS-485 receiver stages where fast edge discrimination is critical. IC Role / Device Role / Timing Role: High-speed comparator converting differential bus voltages into clean TTL logic levels with noise immunity. Use Value: Input common-mode range including VEE allows direct interface to −7V to +12V bus common-mode swings when VEE = −5V. |
| PWM Circuits | Threshold Detectors |
Use Scenario: Real-time duty-cycle monitoring and fault detection in motor control inverters using triangle-wave comparison. IC Role / Device Role / Timing Role: Comparator comparing sensed current/voltage against modulated reference to generate precise PWM edge triggers. Use Value: 18mW per comparator enables integration of multiple detection channels without thermal derating in compact gate-driver modules. | Use Scenario: Multi-level alarm generation in power supply supervision or battery management systems. IC Role / Device Role / Timing Role: Quad comparator independently monitoring four voltage rails (e.g., 1.2V, 1.8V, 3.3V, 5V) against programmable thresholds. Use Value: Independent latch inputs allow asynchronous alarm capture and subsequent readout by microcontroller without missed events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9203ESA+ | Pin-for-pin compatible, same 8ns propagation delay, but 9mW/comparator (half the power of MAX903CSA+) | Identical functional scope; optimized for battery-powered or thermally limited systems | Select MAX9203ESA+ when lower power dissipation is required without changing layout or firmware. |
| LM339DR | Slower (1.3µs propagation delay), no latch inputs, open-collector outputs requiring external pull-ups | Suitable only for non-critical, low-speed threshold detection where timing precision is not required | Choose LM339DR only for cost-sensitive, low-frequency applications where 8ns timing and latch functionality are unnecessary. |
Compared with MAX903CSA+, MAX9203ESA+ offers identical speed and pinout with halved power consumption, while LM339DR trades speed, latch capability, and integrated pull-ups for broad availability and ultra-low cost - making it unsuitable for high-speed sampling but viable for basic voltage monitoring.
Availability
MAX903CSA+ is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial line receivers, and PWM-based motor control systems requiring stable component supply across extended production cycles.
Supply support for MAX903CSA+ 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 computing applications.
The MAX900–MAX903 family was designed specifically for high-speed, low-power voltage comparison in data conversion, communication, and real-time control systems - emphasizing speed, latch synchronization, and supply flexibility.
FAQ
What is the maximum operating frequency supported by the MAX903CSA+?
The MAX903CSA+ does not specify a maximum operating frequency directly, but its 8ns typical propagation delay at 5mV overdrive implies reliable operation with input signal edges faster than ~125MHz. In practice, it is used in flash ADC front-ends and high-speed line receivers where timing resolution below 10ns is required. The actual usable bandwidth depends on layout, input slew rate, and load capacitance - as detailed in Figures 5–8 of the MAX903CSA+ datasheet.
Does the MAX903CSA+ support single-supply operation?
Yes, the MAX903CSA+ supports true single-supply operation: VEE can be connected to ground while VCC is set to +5V to +10V, and VDD remains at +5V. Its input common-mode range includes the negative rail (VEE), allowing ground-referenced inputs. This configuration is explicitly validated in Figure 1A and Table "Typical Operating Characteristics" of the MAX903CSA+ datasheet.
What is the purpose of the LATCH pin on the MAX903CSA+?
The LATCH pin on the MAX903CSA+ controls output state retention: when driven low, it freezes the current comparator output state regardless of subsequent input changes; when high, the comparator operates transparently. This enables synchronous sampling in systems like A/D converters or alarm monitors. The latch function is TTL-compatible (VLH = 1.4–2.0V, VLL = 0.8–1.4V) and is confirmed for MAX903CSA+ in the "Pin Descriptions" and "Timing Diagram" sections of its datasheet.
Can the MAX903CSA+ be used with ±5V analog supplies?
Yes, the MAX903CSA+ is fully specified for ±5V analog supplies: VCC = +5V and VEE = −5V, with VDD = +5V. This split-supply configuration is shown in Figure 1C of the datasheet and supports symmetric input ranges (−5V to +5V common-mode), improved PSRR, and reduced input offset drift. Electrical characteristics tables explicitly list performance under ±5V conditions.
Is the MAX903CSA+ still recommended for new designs?
No - the MAX903CSA+ is marked "Not Recommended for New Designs" because its fabrication process is obsolete. Maxim recommends the pin-compatible MAX9203ESA+ as a drop-in replacement offering identical speed and half the power dissipation. While MAX903CSA+ remains available for legacy support and existing production, new designs should evaluate MAX9203ESA+ or other modern alternatives per Maxim's QuickView documentation.
MAX903CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- with Latch
- Number of Elements:
- 1
- 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):
- 4mA, 3mA, 1.5mA
- Current - Quiescent (Max):
- 82.5dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX903CSA+ FAQ
1.How can I place an order for MAX903CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX903CSA+ 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 MAX903CSA+ reliable?
The price and inventory of MAX903CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX903CSA+ is usually 5 days.
3.What payment methods are accepted for MAX903CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX903CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX903CSA+?
MAX903CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX903CSA+ 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 MAX903CSA+?
For technical support, including MAX903CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX903CSA+ requirements.
6.How does Aetrix verify that MAX903CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX903CSA+ 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 MAX903CSA+ meets industry standards.
7.What is the process for return or replacement of MAX903CSA+?
All MAX903CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX903CSA+, 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 MAX903CSA+ part is unused and in its original packaging.
Return procedure for MAX903CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX903CSA+ 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.
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