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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:
Inventory:2,896
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Product details
Overview
The MAX973CSA from Maxim Integrated is a dual ultra-low-power comparator with integrated 1.182V ±1% voltage reference and programmable hysteresis via HYST pin. It operates from single 2.5V–11V or dual ±1.25V–±5.5V supplies, features open-drain outputs sinking to V−, and draws ≤4µA supply current over temperature - ideal for battery-powered threshold detection in portable instrumentation and power monitoring systems.
For engineers reviewing the MAX973CSA datasheet, MAX973CSA pinout, MAX973CSA application, or MAX973CSA equivalent, key selection considerations include its dual-comparator architecture with shared reference, HYST-pin hysteresis programming capability, rail-to-rail input range (V− to V+ − 1.3V), 12µs propagation delay at 10mV overdrive, and SO-8 package compatibility with legacy layouts.
Technical Context
The MAX973CSA integrates two independent comparators sharing a precision 1.182V ±1% bandgap reference referenced to V−, enabling accurate window or dual-threshold detection without external references. Its HYST pin allows simple resistor-based hysteresis tuning (REF to REF − 50mV), eliminating need for feedback networks while maintaining sub-4µA quiescent current.
Designed for single-supply operation (V− = GND), it supports true rail-to-rail inputs down to V− and up to V+ − 1.3V, with open-drain outputs sinking to V− - making it suitable for level translation between bipolar and single-ended domains and wire-ORed logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single 2.5V–11V or dual ±1.25V–±5.5V - supports wide-input industrial and battery systems without level-shifting circuitry. |
| Quiescent Current | ≤4µA over temperature - enables multi-year operation on coin-cell batteries in always-on sensing nodes. |
| Reference Accuracy | 1.182V ±1% (0°C to +70°C) - provides stable threshold baseline for precision undervoltage/overvoltage detection. |
| Propagation Delay | 12µs at 10mV overdrive - balances speed and ultra-low power for slow-varying signals like battery voltage monitoring. |
| Input Common-Mode Range | V− to V+ − 1.3V - accommodates full-rail sensing in 3V/5V systems without clamping diodes or bias resistors. |
| Output Type | Open-drain, sinks to V− - enables flexible pull-up to any voltage ≤11V above V− for mixed-voltage interface design. |
| Hysteresis Control | HYST pin accepts 0–50mV below REF - permits precise, resistor-programmable hysteresis without external op-amps or feedback paths. |
Pinout & Package
MAX973CSA is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, compatible with automated assembly and IPC-7351B land patterns.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for single-supply operation; connects to V− when using single supply. |
| 2 | V− | Negative supply rail; tied to GND in single-supply mode; defines reference point for REF and output sink. |
| 3 | IN+ | Noninverting input of Comparator A - accepts signals from V− to V+ − 1.3V. |
| 4 | IN− | Inverting input of Comparator A - used for threshold comparison or feedback in window configurations. |
| 5 | HYST | Hysteresis control input; sets hysteresis band by voltage offset from REF (0–50mV). |
| 6 | REF | 1.182V ±1% reference output referenced to V−; sources/sinks up to 25µA/15µA. |
| 7 | V+ | Positive supply rail; supports 2.5V–11V single or ±1.25V–±5.5V dual supply operation. |
| 8 | OUT | Open-drain output of Comparator A; sinks current to V−; requires external pull-up for logic-level output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator with shared reference | Enables compact window detector designs using one IC instead of discrete comparators + reference IC. |
| HYST-pin programmable hysteresis | Eliminates need for external positive feedback resistors, reducing component count and layout area by >30%. |
| Open-drain outputs sinking to V− | Supports level translation across voltage domains (e.g., ±5V input → 3.3V logic) without additional transistors. |
| Rail-to-rail input range | Accepts signals directly from battery terminals or sensor outputs without input biasing networks. |
| Ultra-low 4µA supply current | Extends battery life in portable devices beyond 5 years in typical low-duty-cycle monitoring applications. |
Applications
| Battery Voltage Monitoring | Power-Good Window Detection |
|---|---|
Use Scenario: Monitoring Li-ion battery pack voltage during charge/discharge cycles to trigger low-battery alerts and prevent overvoltage damage. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against upper (e.g., 4.3V) and lower (e.g., 3.0V) thresholds derived from internal REF and resistor dividers. Use Value: Eliminates external reference and reduces BOM count by two components versus discrete solutions, while maintaining ±1% threshold accuracy over temperature. | Use Scenario: Validating regulated DC supply stability in embedded systems before enabling microcontroller reset release. IC Role / Device Role / Timing Role: Configured as window comparator where OUTA and OUTB are wire-ORed to generate active-high "power-good" signal only when VIN stays within safe bounds. Use Value: Achieves <10µA total system quiescent current in power-good circuit - critical for energy-harvesting and ultra-low-power IoT gateways. |
| Level Translation Interface | Oscillator Enable Control |
Use Scenario: Converting ±5V analog sensor outputs to 3.3V logic-compatible signals for ADC input in mixed-signal data acquisition modules. IC Role / Device Role / Timing Role: Uses open-drain output pulled to 3.3V and REF-referenced thresholds to translate bipolar input into unipolar logic levels. Use Value: Avoids dedicated level-shifter ICs; leverages built-in REF and HYST for noise-immune zero-crossing detection at <4µA overhead. | Use Scenario: Enabling crystal oscillator startup only when supply voltage exceeds minimum operating threshold (e.g., 2.7V) to prevent unstable clock generation. IC Role / Device Role / Timing Role: Single comparator monitors VCC against REF-derived threshold; HYST pin adds 20mV hysteresis to prevent oscillation near trip point. Use Value: Guarantees clean oscillator enable with no external components - reduces PCB area by 1.2 mm² versus RC-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX983CSA | Same pinout and package; ±2% reference accuracy instead of ±1%. | Suitable where cost sensitivity outweighs need for tight threshold tolerance. | Select MAX983CSA if ±2% reference drift is acceptable and budget constraints dominate. |
| TLV3702IDR | No integrated reference; requires external 1.2V reference; higher 8µA supply current. | Used where reference voltage must be user-selectable or higher-precision external reference is already present. | Choose TLV3702IDR only when flexibility in reference voltage or higher speed (1.5µs delay) justifies added components and power. |
Compared with MAX973CSA, MAX983CSA trades reference accuracy for lower unit cost while retaining identical functionality and layout compatibility; TLV3702IDR offers faster response but increases BOM count and power consumption, making it less optimal for battery-critical designs.
Availability
MAX973CSA is available at Aetrix Electronics and suitable for battery-powered systems, power monitoring circuits, and portable instrumentation requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
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) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX97x/MAX98x comparator family was designed specifically for ultra-low-power threshold detection in portable and energy-constrained systems, emphasizing micropower operation, integrated references, and simplified hysteresis implementation.
FAQ
What is the reference voltage accuracy of the MAX973CSA over temperature?
The MAX973CSA features a 1.182V internal bandgap reference with ±1% accuracy over the commercial temperature range (0°C to +70°C). This specification is guaranteed per the datasheet's Electrical Characteristics table for MAX973CSA, and applies to the entire operating temperature range specified for this grade. The reference is referenced to V−, not GND, so its absolute output voltage shifts with V− potential - a key consideration in dual-supply configurations. MAX973CSA maintains this tolerance without requiring external trimming or calibration.
Can the MAX973CSA operate from a 3V single supply?
Yes, the MAX973CSA fully supports 3V single-supply operation (V+ = 3V, V− = GND). Its supply voltage range is specified from 2.5V to 11V for single-supply use, and electrical characteristics including supply current (≤4µA), input common-mode range (GND to 1.7V), and propagation delay (12µs at 10mV overdrive) are validated at 3V per the datasheet's 3V Operation section. The internal 1.182V reference remains functional and stable at this voltage, enabling accurate threshold detection in modern low-voltage portable systems.
How is hysteresis implemented on the MAX973CSA?
Hysteresis on the MAX973CSA is implemented via the HYST pin, which accepts a voltage from REF down to REF − 50mV. By connecting two resistors between REF, HYST, and V−, users program a hysteresis band equal to twice the REF–HYST voltage difference - up to 100mV maximum. This method replaces external positive-feedback networks, avoids loading the reference, and preserves the ultra-low 4µA quiescent current. The MAX973CSA datasheet provides exact equations for R1 and R2 selection based on desired hysteresis and REF source current limits.
What is the output configuration of the MAX973CSA and how should it be terminated?
The MAX973CSA has an open-drain output that sinks current to V− (not GND), supporting both single-supply (V− = GND) and dual-supply (V− < GND) operation. It requires an external pull-up resistor to a logic rail (e.g., 3.3V or 5V) - the value selected based on speed vs. power trade-off (e.g., 10kΩ for general purpose, 1MΩ for ultra-low power). The output can tolerate up to 11V above V−, enabling level translation across voltage domains. No pull-down is needed, and the output remains high-impedance when not actively sinking.
Is the MAX973CSA pin-compatible with other devices in the MAX97x/MAX98x family?
Yes, the MAX973CSA is pin-compatible with MAX971CSA, MAX981CSA, MAX982CSA, and MAX983CSA in the 8-pin SO package - all share identical pinout (GND, V−, IN+, IN−, HYST, REF, V+, OUT). However, functional differences exist: MAX971/MAX981 are single comparators; MAX982/MAX983 have ±2% reference; MAX973CSA is the only dual-comparator variant with ±1% reference in SO-8. Layout reuse is possible, but reference accuracy and channel count must be verified per application requirements.
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:
- Obsolete
- 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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