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Analog Devices Inc./Maxim Integrated MAX923CUA
- Part No.:
- MAX923CUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX923CUA.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
The MAX923CUA from Maxim Integrated is a dual, micro-power, low-voltage comparator with integrated 1.182V ±1% bandgap reference and programmable hysteresis via HYST pin. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), draws ≤6µA quiescent current over temperature, and features TTL/CMOS-compatible outputs capable of sourcing up to 40mA. It is used in battery-powered threshold detection and window comparator circuits requiring rail-to-rail input range and stable reference.
For engineers reviewing the MAX923CUA datasheet, MAX923CUA pinout, MAX923CUA application, or MAX923CUA equivalent, key selection criteria include its dual-comparator architecture with internal reference, 8-pin µMAX package, adjustable hysteresis without external feedback, and guaranteed operation down to +2.5V supply - critical for low-power industrial sensing and portable instrumentation designs.
Technical Context
The MAX923CUA integrates two independent comparators sharing a common internal 1.182V reference and a dedicated HYST pin for simultaneous hysteresis programming on both channels. Its input common-mode range extends from V− to (V+ − 1.3V), enabling operation near ground in single-supply systems. The output stage sources up to 40mA continuously and eliminates crowbar current during transitions, minimizing supply-line parasitic feedback.
Unlike MAX922/MAX924, the MAX923CUA supports hysteresis configuration using only two external resistors tied to REF and V−, avoiding complex positive-feedback networks. Its propagation delay is 12µs (typ.) at 10mV overdrive, and input offset voltage is ±10mV - optimized for precision threshold detection in noisy, low-power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply; enables direct use with Li-ion, 3.3V, and 5V rails without level-shifting. |
| Quiescent Current | ≤6µA (C temp range, TA = +25°C); ensures multi-year battery life in always-on sensor nodes. |
| Reference Voltage | 1.182V ±1% (0°C to +70°C); provides stable, factory-trimmed threshold anchor for both comparators. |
| Input Offset Voltage | ±10mV; defines minimum detectable signal differential in precision level-sensing applications. |
| Propagation Delay | 12µs (10mV overdrive); supports response timing in sub-100kHz window-detection and oscillator circuits. |
| Output Source Current | 40mA continuous; drives LEDs, small relays, or logic inputs directly without external buffers. |
| Input Common-Mode Range | V− to (V+ − 1.3V); allows full-scale sensing from ground up to within 1.3V of supply rail. |
Pinout & Package
Package: 8-pin µMAX (3mm × 3mm, 0.5mm pitch), thermally enhanced, lead-free, RoHS-compliant surface-mount package rated for 330mW continuous power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference; connects to V− for single-supply operation; output swings from V+ to GND. |
| 2 | V− | Negative supply terminal; tied to GND in single-supply mode; sets reference and output lower rail. |
| 3 | INA+ | Noninverting input of Comparator A; accepts signals from V− to (V+ − 1.3V). |
| 4 | INA− | Inverting input of Comparator A; matched with INA+ for differential threshold comparison. |
| 5 | INB− | Inverting input of Comparator B; electrically identical to INA−; supports independent second channel. |
| 6 | HYST | Hysteresis control input; voltage between REF and HYST sets hysteresis band (max 100mV) for both comparators. |
| 7 | REF | 1.182V reference output referenced to V−; supplies precise bias for threshold-setting resistor dividers. |
| 8 | V+ | Positive supply input; accepts +2.5V to +11V; powers both comparators and reference circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparators with shared reference | Enables compact window detector or dual-threshold monitoring in one 3×3mm package - reduces PCB area vs. discrete solutions. |
| Programmable hysteresis via HYST pin | Eliminates need for external feedback resistors or op-amp-based hysteresis circuits - simplifies layout and improves noise immunity. |
| 40mA continuous output source capability | Drives LEDs, MOSFET gates, or logic loads directly - removes requirement for external driver stages in low-speed control paths. |
| No crowbar current during switching | Prevents supply rail disturbance and avoids instability in poorly decoupled or high-impedance power domains. |
| Rail-to-rail input range (V− to V+ − 1.3V) | Supports full-scale analog monitoring in 3V systems - e.g., detecting battery voltage drop to 0.3V above ground. |
Applications
| Battery-Powered Threshold Detector | Window Comparator |
|---|---|
Use Scenario: Monitoring lithium coin-cell voltage to trigger shutdown before deep discharge. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against upper (e.g., 3.0V) and lower (e.g., 2.4V) thresholds derived from REF and resistor dividers. Use Value: Internal reference and hysteresis eliminate external components, reducing BOM count and leakage path - extending shelf life beyond 5 years. | Use Scenario: Validating regulated 5V supply in embedded controller by detecting undervoltage (<4.75V) and overvoltage (>5.25V). IC Role / Device Role / Timing Role: MAX923CUA acts as dual-input safety monitor; OUTA asserts low on undervoltage, OUTB low on overvoltage; AND-gated output signals "POWER_GOOD". Use Value: Simultaneous dual-channel comparison with shared reference ensures matched trip points and thermal drift cancellation - improving accuracy to ±15mV over 0°C–70°C. |
| Oscillator Circuit | Bar-Graph Level Gauge |
Use Scenario: Building relaxation oscillator for LED blink rate control in portable devices. IC Role / Device Role / Timing Role: One comparator functions as Schmitt trigger with RC network tied to HYST and REF; second comparator unused or grounded. Use Value: Programmable hysteresis and low supply current enable stable oscillation at <1µA average current - suitable for energy-harvesting systems. | Use Scenario: Four-stage LED bar-graph indicating analog input level (e.g., audio signal strength or sensor output). IC Role / Device Role / Timing Role: Two comparators set adjacent thresholds (e.g., 25%, 50%, 75%, 100% of full scale); REF and resistor ladder define precise voltage steps. Use Value: 40mA output drive per channel powers multiple LEDs in parallel without current-limiting resistors - simplifying front-panel design and reducing component count. |
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 |
|---|---|---|---|
| LM393DR | No internal reference; requires external voltage divider or reference IC; higher quiescent current (200µA typical); open-collector outputs only. | Suitable for cost-sensitive, non-battery applications where reference accuracy and ultra-low power are not required. | Select LM393DR only when reference independence, higher speed (>1.3µs), or open-drain flexibility outweighs power and integration penalties. |
| TLV3702IDR | Includes internal reference (1.2V, ±2%); lower supply current (1.3µA); rail-to-rail inputs; but no dedicated HYST pin - hysteresis requires external feedback. | Better for ultra-low-power systems needing tighter supply budget, but adds design complexity for hysteresis implementation. | Choose TLV3702IDR when quiescent current is paramount and board space allows external hysteresis resistors. |
Compared with LM393DR and TLV3702IDR, the MAX923CUA uniquely combines dual comparators, ±1% reference, and pin-controlled hysteresis in an 8-pin µMAX package - delivering lowest system-level component count and longest battery life for precision threshold detection.
Availability
MAX923CUA is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor interfaces, and portable medical devices requiring stable component supply and long-term obsolescence support.
Supply support for MAX923CUA 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, and interface applications in industrial, automotive, and computing markets.
The MAX921–MAX924 family was engineered specifically for ultra-low-power, single-supply threshold detection - prioritizing micropower operation, integrated reference accuracy, and simplified hysteresis implementation in space-constrained systems.
FAQ
What is the maximum supply voltage for the MAX923CUA?
The MAX923CUA supports a single-supply voltage range of +2.5V to +11V. When operated from dual supplies, it accepts ±1.25V to ±5.5V. Exceeding +11V or applying more than ±5.5V risks permanent damage, as specified in Absolute Maximum Ratings. For reliable operation across temperature, the recommended maximum is +11V with proper derating above +70°C ambient.
Does the MAX923CUA require external hysteresis components?
No - the MAX923CUA includes a dedicated HYST pin that enables hysteresis programming using just two external resistors (between REF, HYST, and V−). This eliminates the need for external positive-feedback networks. Hysteresis bandwidth is adjustable up to 100mV and applies identically to both comparators, simplifying design versus alternatives like LM393DR.
Can the MAX923CUA operate from a 3V supply?
Yes - the MAX923CUA is fully specified and functional at +3V single supply. Electrical Characteristics tables confirm performance at V+ = 3V, including 6µA max supply current, 12µs propagation delay, and valid input common-mode range (V− to V+ − 1.3V = −1.3V to +1.7V). It is widely deployed in 3V coin-cell and 3.3V microcontroller systems.
What is the function of the REF pin on the MAX923CUA?
REF is the output of the internal 1.182V ±1% bandgap voltage reference, referenced to V− (not GND). It provides a stable, low-drift voltage source for setting comparator thresholds via resistor dividers. The REF pin can source up to 25µA (typ.) and sink up to 15µA (typ.), and must not be bypassed - capacitive loading degrades noise performance and stability.
Is the MAX923CUA pin-compatible with other MAX92x variants?
No - the MAX923CUA uses an 8-pin µMAX package with a unique pinout (GND, V−, INA+, INA−, INB−, HYST, REF, V+). It is not pin-compatible with MAX921CUA (different pin 1/2 assignments) or MAX922CUA (no REF/HYST pins). Substitution requires PCB layout revision; functional equivalence does not imply mechanical compatibility.
MAX923CUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 2
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 7.5µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX923CUA FAQ
1.How can I place an order for MAX923CUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX923CUA 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 MAX923CUA reliable?
The price and inventory of MAX923CUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX923CUA is usually 5 days.
3.What payment methods are accepted for MAX923CUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX923CUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX923CUA?
MAX923CUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX923CUA 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 MAX923CUA?
For technical support, including MAX923CUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX923CUA requirements.
6.How does Aetrix verify that MAX923CUA is sourced from the original manufacturer or authorized distributors?
All MAX923CUA 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 MAX923CUA meets industry standards.
7.What is the process for return or replacement of MAX923CUA?
All MAX923CUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX923CUA, 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 MAX923CUA part is unused and in its original packaging.
Return procedure for MAX923CUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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