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Analog Devices Inc./Maxim Integrated MAX973CSA-T
- Part No.:
- MAX973CSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX973CSA-T.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,808
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Product details
Overview
The MAX973CSA-T from Maxim Integrated is a dual, ultra-low-power, open-drain 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, draws ≤4µA supply current over temperature, supports rail-to-rail input common-mode range (V− to V+ − 1.3V), and is used in battery-powered threshold detectors and window comparators.
For engineers reviewing the MAX973CSA-T datasheet, MAX973CSA-T pinout, MAX973CSA-T application, or MAX973CSA-T equivalent, key selection criteria include its dual-comparator architecture with shared reference, HYST-pin hysteresis programming capability, 12µs propagation delay at 10mV overdrive, open-drain output compatibility with wire-OR configurations, and SO-8 package suitability for space-constrained industrial and portable designs.
Technical Context
The MAX973CSA-T integrates two independent micropower comparators sharing a precision 1.182V ±1% bandgap reference referenced to V−. Its HYST pin enables simple resistor-based hysteresis configuration without external feedback, delivering symmetric upper/lower thresholds with up to 100mV hysteresis band.
Designed for single- or dual-supply operation, it features rail-inclusive inputs (V− to V+ − 1.3V), open-drain outputs sinking to V−, and separate GND connection only on MAX971/MAX974 - not applicable here. Propagation delay is specified at 12µs (high-to-low) with 10mV overdrive and 100pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single 2.5V–11V or dual ±1.25V–±5.5V - supports direct integration into 3V/5V systems and bipolar signal conditioning paths. |
| Quiescent Supply Current | ≤4µA over temperature - enables multi-year operation on coin-cell batteries in always-on monitoring circuits. |
| Reference Voltage Accuracy | 1.182V ±1% (0°C to +70°C) - provides stable, factory-trimmed threshold for precision undervoltage/overvoltage detection. |
| Propagation Delay | 12µs (high-to-low, 10mV overdrive, 100pF load) - defines minimum response time for fast transient detection in power-good monitoring. |
| Input Common-Mode Range | V− to V+ − 1.3V - allows direct sensing of signals near supply rails without level-shifting circuitry. |
| Output Type | Open-drain, sinks to V− - enables wired-OR logic, level translation between disparate voltage domains, and flexible pull-up configuration. |
| Hysteresis Control | HYST pin accepts REF − 50mV to REF - permits user-defined hysteresis band (up to 100mV) using two external resistors, eliminating need for feedback networks. |
Pinout & Package
MAX973CSA-T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, body size 4.9mm × 3.9mm × 1.75mm, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Comparator A open-drain output | Sinks current to V−; requires external pull-up for logic-high assertion; compatible with wired-OR bus topologies. |
| 2 (V−) | Negative supply | Connect to GND for single-supply operation; defines reference point for REF and input common-mode range. |
| 3 (INA+) | Noninverting input of Comparator A | Accepts input signals from V− to V+ − 1.3V; high-impedance (±0.01nA leakage) minimizes loading on sensor sources. |
| 4 (INA−) | Inverting input of Comparator A | Paired with INA+ for differential threshold comparison; identical electrical characteristics to INA+. |
| 5 (HYST) | Hysteresis control input | Accepts voltage from REF − 50mV to REF; sets hysteresis band width when used with external R1/R2 divider. |
| 6 (REF) | 1.182V reference output | Stable, ±1% accurate voltage referenced to V−; capable of sourcing 25µA/sinking 15µA; must not be bypassed. |
| 7 (V+) | Positive supply | Accepts 2.5V–11V single supply or positive rail of dual supply; powers internal comparators and reference. |
| 8 (OUTB) | Comparator B open-drain output | Independent of OUTA; enables dual-threshold (e.g., window) detection with single device and shared REF/HYST. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator with shared reference | Reduces component count and board area in window detector or dual-threshold applications by integrating both comparators and one precision reference in SO-8. |
| Programmable hysteresis via HYST pin | Eliminates need for external positive-feedback resistors and op-amp stages; enables precise, low-current hysteresis tuning with just two resistors. |
| Rail-inclusive input range | Supports direct interface to sensors and battery terminals without level-shifting, extending usable dynamic range in low-voltage systems. |
| Ultra-low 4µA quiescent current | Enables continuous monitoring in energy-harvesting and battery-backed systems where average current budget is sub-10µA. |
| Open-drain outputs sinking to V− | Permits interoperability across mixed-voltage domains (e.g., 3.3V logic controlling 5V loads) and simplifies OR-ing of multiple comparator outputs. |
Applications
| Battery Voltage Monitoring | Power-Good Window Detection |
|---|---|
Use Scenario: Monitoring lithium-ion battery pack voltage during charge/discharge cycles to trigger low-battery alert and overvoltage cutoff. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against upper (e.g., 4.25V) and lower (e.g., 3.0V) thresholds derived from REF and resistor dividers; HYST pin adds noise immunity. Use Value: Single MAX973CSA-T replaces two discrete comparators and a reference IC, reducing BOM cost and PCB footprint while maintaining ±1% threshold accuracy. | Use Scenario: Validating regulated DC supply stability in microcontroller-based systems before enabling critical peripherals. IC Role / Device Role / Timing Role: Configured as window comparator: OUTA asserts low below undervoltage threshold, OUTB asserts low above overvoltage threshold; wired-OR output yields active-high "power good" signal. Use Value: 12µs propagation delay ensures rapid fault response; open-drain outputs allow direct interfacing to 1.8V/3.3V MCU reset inputs without level translators. |
| Level Translation Interface | Oscillator Enable Control |
Use Scenario: Converting ±5V analog comparator outputs to 3.3V logic-compatible signals for FPGA input pins. IC Role / Device Role / Timing Role: MAX973CSA-T's open-drain outputs sink to V− (GND in single-supply mode), allowing pull-up to 3.3V; REF provides stable bias for input scaling networks. Use Value: Eliminates need for dedicated level-shifter ICs; dual outputs support simultaneous translation of two independent signals in same package. | Use Scenario: Enabling/disabling a crystal oscillator based on system wake-up event or battery voltage sufficiency. IC Role / Device Role / Timing Role: One comparator monitors enable signal or supply rail; HYST pin prevents chatter during slow-rising control lines; open-drain output drives oscillator EN pin directly. Use Value: 4µA supply current ensures negligible impact on standby power; REF pin provides accurate, stable enable threshold independent of V+ variation. |
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-T | Same pinout and package; ±2% reference accuracy instead of ±1% | Lower accuracy acceptable in cost-sensitive, non-critical threshold detection (e.g., basic battery presence check) | Select MAX983CSA-T where ±2% reference tolerance meets system requirements and cost reduction is prioritized. |
| TLV3702IDR | No integrated reference; rail-to-rail input/output; 850nA supply current; SOT-23-8 package | Requires external reference; better for ultra-low-power apps needing <1µA sleep current, but increases design complexity | Choose TLV3702IDR only when reference independence and sub-µA quiescent current outweigh integration benefits of MAX973CSA-T. |
Compared with MAX983CSA-T, the MAX973CSA-T offers tighter reference accuracy for precision thresholding; compared with TLV3702IDR, it trades higher quiescent current for integrated reference and simplified hysteresis implementation - making it optimal for compact, accuracy-critical dual-threshold detection where board space and BOM count matter.
Availability
MAX973CSA-T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and level translators requiring stable component supply and long-term production continuity.
Supply support for MAX973CSA-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) designs precision analog and mixed-signal ICs for industrial, medical, communications, and consumer applications.
The MAX97x/MAX98x comparator family was engineered for ultra-low-power, high-accuracy threshold detection in portable and energy-constrained systems - emphasizing micropower operation, integrated references, and simplified hysteresis implementation.
FAQ
What is the reference voltage tolerance of the MAX973CSA-T over temperature?
The MAX973CSA-T features a 1.182V internal bandgap reference with ±1% accuracy over the commercial temperature range (0°C to +70°C). This tolerance is guaranteed and does not degrade beyond that range - unlike MAX98x variants which specify ±2%. The reference is referenced to V−, not GND, and must not be bypassed to maintain accuracy. MAX973CSA-T maintains this specification across its full operating supply range.
Can the MAX973CSA-T operate from a 1.8V single supply?
No, the MAX973CSA-T requires a minimum total supply voltage of 2.5V for guaranteed operation. While some members of the MAX97x/MAX98x family (e.g., MAX974) may function down to 1V, the MAX973CSA-T is not characterized or specified below 2.5V. Attempting operation at 1.8V risks undefined behavior, including reference dropout, increased propagation delay, and unreliable output switching. Always adhere to the 2.5V–11V specified range for MAX973CSA-T.
How is hysteresis programmed on the MAX973CSA-T?
Hysteresis on the MAX973CSA-T is programmed using the HYST pin: connect resistor R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band (VHB) ≈ 2 × (VREF − VHYST), with VHYST adjustable from REF − 50mV to REF - yielding up to 100mV total hysteresis. For example, setting VHYST = REF − 25mV gives VHB = 50mV. The MAX973CSA-T's internal hysteresis circuit eliminates need for external feedback, unlike standard comparators.
What is the maximum sink current capability of the MAX973CSA-T outputs?
The MAX973CSA-T open-drain outputs are specified to sink up to 1.8mA while maintaining VOL ≤ V− + 0.4V (at V+ = 5V, V− = GND). Sink capability scales with supply voltage: at V+ = 3V, it drops to ~0.8mA under same conditions. The outputs sink to V−, not GND - critical for dual-supply operation. Absolute maximum continuous sink current is 50mA, but thermal limits constrain practical use to ≤2mA in SO-8 package at +70°C ambient.
Does the MAX973CSA-T have a separate ground pin for the output stage?
No, the MAX973CSA-T does not have a separate GND pin for the output stage. Unlike MAX971/MAX974, which feature dedicated GND pins enabling bipolar-to-single-ended conversion, the MAX973CSA-T outputs sink current to V−. This means its output low voltage is referenced to V−, not system GND - requiring careful attention when using in single-supply configurations where V− = GND versus dual-supply setups where V− is negative.
MAX973CSA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for MAX973CSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX973CSA-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 MAX973CSA-T reliable?
The price and inventory of MAX973CSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX973CSA-T is usually 5 days.
3.What payment methods are accepted for MAX973CSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX973CSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX973CSA-T?
MAX973CSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX973CSA-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 MAX973CSA-T?
For technical support, including MAX973CSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX973CSA-T requirements.
6.How does Aetrix verify that MAX973CSA-T is sourced from the original manufacturer or authorized distributors?
All MAX973CSA-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 MAX973CSA-T meets industry standards.
7.What is the process for return or replacement of MAX973CSA-T?
All MAX973CSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX973CSA-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 MAX973CSA-T part is unused and in its original packaging.
Return procedure for MAX973CSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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