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Analog Devices Inc./Maxim Integrated MAX973CSA+
- Part No.:
- MAX973CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX973CSA+.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX973CSA+ from Maxim Integrated is a dual, ultra-low-power, open-drain comparator with integrated 1.182V ±1% bandgap reference and programmable hysteresis via HYST pin. It operates from single 2.5V–11V or dual ±1.25V–±5.5V supplies, draws ≤4µA supply current over temperature, supports rail-to-rail input voltage range (V− to V+ − 1.3V), and is used in battery-powered threshold detectors and window comparators.
For engineers reviewing the MAX973CSA+ datasheet, MAX973CSA+ pinout, MAX973CSA+ application, or MAX973CSA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for low-power comparator selection in space-constrained, single-supply systems.
Technical Context
The MAX973CSA+ integrates two independent micropower comparators sharing one internal 1.182V ±1% reference and a dedicated HYST pin enabling simple resistor-based hysteresis programming without external feedback. Its open-drain outputs sink current to V−, not GND, distinguishing it from MAX971/MAX974 variants.
Input common-mode range extends from V− to (V+ − 1.3V); propagation delay is 12µs (10mV overdrive, 100pF load, 1MΩ pullup); output leakage is ≤100nA at 11V; and reference output can source up to 25µA or sink 15µA - all specified across 0°C to +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single 2.5V to 11V or dual ±1.25V to ±5.5V - enables direct operation from Li-ion, 3.3V, or 5V rails without level shifting. |
| Quiescent Supply Current | ≤4µA max over temperature - ensures multi-year battery life in always-on sensor nodes and portable instrumentation. |
| Reference Voltage Accuracy | 1.182V ±1% (0°C to +70°C) - provides stable, factory-trimmed threshold for precision undervoltage/overvoltage detection. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - supports sensing near ground or high-side signals without external biasing resistors. |
| Propagation Delay | 12µs typical (10mV overdrive) - balances speed and power for wake-up triggers and slow-control-loop monitoring. |
| Output Configuration | Open-drain, sinks to V− - allows wire-ORing of multiple comparators and bipolar-to-single-ended level translation. |
| Hysteresis Control | HYST pin accepts REF − 0.05V to REF - enables adjustable hysteresis band up to 100mV using two external resistors. |
Pinout & Package
MAX973CSA+ uses an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, body size 4.9mm × 3.9mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTA | Comparator A open-drain output | Sinks current to V−; requires external pullup for logic-high assertion; supports wired-OR with other open-drain outputs. |
| 2 - V− | Negative supply | Reference for REF, IN+, IN−, HYST, and output sink node; connect to GND in single-supply mode. |
| 3 - INA+ | Noninverting input of Comparator A | Accepts signals from V− to (V+ − 1.3V); high-impedance (±0.01nA leakage) minimizes loading on sensor dividers. |
| 4 - INB− | Inverting input of Comparator B | Paired with INB+ (Pin 6) to form second independent comparator; identical input specs to INA+ and INA−. |
| 5 - HYST | Hysteresis control input | Adjusts switching thresholds by setting voltage between REF and HYST; range: REF − 50mV to REF. |
| 6 - REF | Internal 1.182V reference output | Referenced to V− (not GND); sources/sinks up to 25µA/15µA; must not be bypassed or loaded beyond spec. |
| 7 - V+ | Positive supply | Accepts 2.5V–11V single supply or positive rail of dual supply; total V+ − V− ≤ 11V. |
| 8 - OUTB | Comparator B open-drain output | Functionally identical to OUTA; enables dual-threshold (e.g., window) detection with shared REF and HYST. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator + reference in 8-pin SO | Reduces board area vs. discrete solutions; eliminates need for external reference IC or hysteresis resistors in basic configurations. |
| Programmable hysteresis via HYST pin | Enables precise noise immunity tuning (up to 100mV band) with only two resistors - no op-amp feedback loop required. |
| Ultra-low 4µA supply current | Supports >10-year operation on CR2032 coin cell in intermittent-sense applications (e.g., IoT endpoint wake-up). |
| Open-drain outputs sinking to V− | Permits level translation between disparate supply domains (e.g., ±5V input → 3.3V logic) without additional transistors. |
| 1.182V ±1% internal reference | Eliminates external voltage divider drift; maintains <±10mV offset error over 0°C–70°C for reliable threshold repeatability. |
Applications
| Battery-Powered Threshold Detector | Window Comparator (Undervoltage/Overvoltage) |
|---|---|
Use Scenario: Monitoring lithium-polymer battery voltage during sleep mode to trigger wake-up at 3.3V and shut down at 2.8V. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against REF-derived thresholds; HYST sets 50mV hysteresis to prevent oscillation near trip points. Use Value: Eliminates external reference and hysteresis components; 4µA quiescent current extends battery life by >3× versus standard comparators. |
Use Scenario: Validating 5V system rail integrity in industrial controllers, asserting "power good" only when voltage stays within 4.5V–5.5V. IC Role / Device Role / Timing Role: MAX973CSA+ implements window detection using INA+/INB− for lower threshold and INB+/INA− for upper threshold, with shared REF and HYST. Use Value: Single IC replaces two comparators + reference + hysteresis network; SO-8 footprint simplifies layout and reduces BOM count. |
| Level Translator (Bipolar to Single-Ended) | Oscillator Circuit (Relaxation Oscillator) |
Use Scenario: Converting ±5V analog sensor output to 3.3V logic-compatible signal for microcontroller ADC input. IC Role / Device Role / Timing Role: Comparator A compares sensor output to 0V (via V− = GND), with open-drain OUTA pulled to 3.3V; REF unused. Use Value: Output sinks to V− (GND) enables clean 0V–3.3V swing; no level-shifting IC or MOSFET required. |
Use Scenario: Generating precise 1Hz clock for real-time clock backup using RC timing and hysteresis-controlled switching. IC Role / Device Role / Timing Role: One comparator acts as Schmitt trigger with HYST-programmed thresholds; capacitor charges/discharges between thresholds via pullup resistor. Use Value: Internal REF and HYST eliminate external voltage dividers; 12µs propagation delay ensures stable oscillation period accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX983CSA+ | Same pinout and package; ±2% reference accuracy (vs. ±1% in MAX973CSA+); otherwise identical electrical specs. | Acceptable where ±2% threshold tolerance suffices (e.g., non-critical battery cutoff); lower cost. | Select MAX983CSA+ when reference accuracy requirement is relaxed and cost sensitivity is high. |
| TLV3702IDR | Lower supply current (1.8µA), but no internal reference; rail-to-rail inputs; push-pull output (no open-drain). | Requires external reference and pullup for open-drain behavior; better for low-noise, low-offset apps without hysteresis needs. | Choose TLV3702IDR when ultra-low current dominates and external reference/hysteresis circuitry is acceptable. |
Compared with MAX973CSA+, MAX983CSA+ trades reference accuracy for cost while retaining pin compatibility, whereas TLV3702IDR offers lower current but demands external support circuitry and lacks integrated hysteresis control - making MAX973CSA+ optimal for self-contained, reference-based threshold detection.
Availability
MAX973CSA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and level translators requiring stable component supply with guaranteed commercial-temperature performance (0°C to +70°C).
Supply support for MAX973CSA+ 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) designs precision analog and mixed-signal ICs for power, sensing, interface, and reliability-critical applications.
The MAX97x/MAX98x comparator family targets ultra-low-power, space-constrained systems needing integrated reference and hysteresis - especially portable medical devices, energy-harvesting sensors, and industrial monitoring endpoints.
FAQ
What is the maximum supply voltage for MAX973CSA+?
The MAX973CSA+ supports a total supply voltage (V+ − V−) up to 11V. In single-supply mode, V− is tied to GND, so V+ may range from 2.5V to 11V. Exceeding 11V risks permanent damage per absolute maximum ratings - confirmed in the datasheet's "Absolute Maximum Ratings" table.
Does MAX973CSA+ have a built-in voltage reference?
Yes, the MAX973CSA+ includes an internal 1.182V ±1% bandgap reference output on Pin 6 (REF), referenced to V−. It is specified across 0°C to +70°C and can source up to 25µA or sink 15µA - enabling direct use for threshold generation without external components.
Can MAX973CSA+ operate from a 3V single supply?
Yes, the MAX973CSA+ is fully specified for 3V single-supply operation (V+ = 3V, V− = GND). Electrical characteristics including supply current (≤3.4µA typ), input range (0V to 1.7V), and propagation delay (12µs) are validated at 3V per the "ELECTRICAL CHARACTERISTICS-3V OPERATION" table.
How is hysteresis programmed on MAX973CSA+?
Hysteresis is programmed via the HYST pin (Pin 5): connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band equals ~2×(REF − VHYST), with VHYST adjustable from REF − 50mV to REF - enabling up to 100mV total hysteresis as detailed in Figure 3 and Applications Information.
What is the output configuration of MAX973CSA+?
The MAX973CSA+ features two open-drain outputs (OUTA on Pin 1, OUTB on Pin 8), each sinking current to V− (not GND). This allows wire-ORing, level translation, and bipolar-to-single-ended conversion - distinct from MAX971/MAX974 which sink to GND.
MAX973CSA+ 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 Voltage Reference
- Number of Elements:
- 2
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 6µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX973CSA+ FAQ
1.How can I place an order for MAX973CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX973CSA+ 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 MAX973CSA+ reliable?
The price and inventory of MAX973CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX973CSA+ is usually 5 days.
3.What payment methods are accepted for MAX973CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX973CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX973CSA+?
MAX973CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX973CSA+ 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 MAX973CSA+?
For technical support, including MAX973CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX973CSA+ requirements.
6.How does Aetrix verify that MAX973CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX973CSA+ 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 MAX973CSA+ meets industry standards.
7.What is the process for return or replacement of MAX973CSA+?
All MAX973CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX973CSA+, 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 MAX973CSA+ part is unused and in its original packaging.
Return procedure for MAX973CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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