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Analog Devices Inc./Maxim Integrated MAX923CUA-T
- Part No.:
- MAX923CUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX923CUA-T.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,308
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Product details
Overview
The MAX923CUA-T from Maxim Integrated is a dual, micropower, 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 ultra-low power and rail-to-rail input operation.
For engineers reviewing the MAX923CUA-T datasheet, MAX923CUA-T pinout, MAX923CUA-T application, or MAX923CUA-T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-comparator hysteresis implementation, and real-world use cases in undervoltage/overvoltage monitoring and auto-off power switches - all grounded in Maxim's official datasheet Rev 7 (1/20).
Technical Context
The MAX923CUA-T integrates two independent comparators sharing a common internal 1.182V reference and a dedicated HYST pin for simultaneous, resistor-programmable hysteresis on both channels. Its input common-mode range extends from V− to (V+ − 1.3V), enabling operation near ground in single-supply systems.
Each comparator output continuously sources up to 40mA and sinks >5mA without crowbar current, eliminating supply-line glitches during transitions. The device uses no external feedback for hysteresis - instead, voltage division between REF and V− via R₁/R₂ sets the hysteresis band directly at the HYST node, with design-limited range of REF − 50mV to REF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply; ±1.25V to ±5.5V dual supply - supports 3V/5V systems and bipolar signal monitoring. |
| Quiescent Supply Current | ≤6µA over 0°C to +70°C - enables multi-year battery life in always-on sensing nodes. |
| Reference Voltage | 1.182V ±1% (0°C to +70°C), referenced to V− - provides stable, factory-trimmed threshold for precision level detection. |
| Propagation Delay | 12µs typical at 10mV overdrive - ensures timely response in fast-acting protection circuits. |
| Input Offset Voltage | ±10mV max - limits threshold error in high-accuracy voltage monitoring applications. |
| Output Drive Capability | Sources 40mA continuously; sinks >5mA - directly drives LEDs, small relays, or logic inputs without external buffers. |
| Hysteresis Control | HYST pin accepts 0–50mV below REF - enables precise, matched hysteresis on both comparators using two resistors. |
Pinout & Package
MAX923CUA-T is housed in an 8-pin μMAX package (2.1mm × 2.1mm, 0.5mm pitch), pin-compatible with SO and DIP variants. The μMAX footprint minimizes PCB area while maintaining thermal performance up to 330mW at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference; connects to V− in single-supply mode; output swings from V+ to GND. |
| 2 | V− | Negative supply rail; tied to GND for single-supply operation; defines reference and output lower bound. |
| 3 | INA+ | Noninverting input of Comparator A - accepts signals from V− to (V+ − 1.3V) with ±10mV offset. |
| 4 | INA− | Inverting input of Comparator A - used with INA+ to set trip point; supports hysteresis via HYST pin. |
| 5 | INB− | Inverting input of Comparator B - identical electrical specs to INA−; shares same reference and hysteresis control. |
| 6 | HYST | Hysteresis programming node - voltage between REF and HYST sets hysteresis band (max 100mV) for both comparators. |
| 7 | REF | 1.182V ±1% bandgap reference output - sourced from V−, not GND; supplies bias for hysteresis and external circuitry. |
| 8 | V+ | Positive supply rail - supports up to +11V; determines output high level (V+ − 0.4V) and input common-mode upper limit. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤6µA over full commercial temperature range - reduces standby power in portable and remote sensors. |
| Dual comparators with shared reference | Single 1.182V reference feeds both channels - eliminates need for external reference ICs and matching errors. |
| Pin-programmable hysteresis | HYST pin enables matched hysteresis on both comparators using only two resistors - no feedback loop or layout sensitivity. |
| Rail-to-rail input capability | Inputs operate from V− to (V+ − 1.3V) - supports direct sensing of battery voltage, sensor outputs, or rail monitors. |
| Glitch-free output stage | No crowbar current during switching - prevents supply noise coupling and eliminates need for heavy bypassing. |
Applications
| Battery-Powered Threshold Detector | Window Comparator (Undervoltage/Overvoltage) |
|---|---|
|
Use Scenario: Monitoring lithium-ion cell voltage during charging/discharging to trigger cutoff at 2.8V (undervoltage) and 4.3V (overvoltage). IC Role / Device Role / Timing Role: Dual comparator compares divided battery voltage against internal 1.182V reference; HYST pin configures symmetric hysteresis to prevent chatter near thresholds. Use Value: Eliminates external reference and hysteresis resistors per channel, reducing BOM count by ≥4 components and PCB area by >30% vs. discrete solutions. |
Use Scenario: Power-good supervision in industrial microcontroller systems where supply must stay within 4.5V–5.5V window. IC Role / Device Role / Timing Role: MAX923CUA-T implements active-low undervoltage (OUTA) and overvoltage (OUTB) flags; AND-gated output yields clean power-good signal. Use Value: Single IC replaces two comparators + reference + four hysteresis resistors - improves long-term threshold stability via matched internal components. |
| Auto-Off Power Switch | LED Bar-Graph Level Indicator |
|
Use Scenario: Enabling a 40mA load only while a momentary switch is pressed, then auto-disabling after RC timeout (e.g., 92 seconds). IC Role / Device Role / Timing Role: MAX923CUA-T comparator controls MOSFET gate; internal reference and hysteresis define turn-on threshold and prevent oscillation during decay. Use Value: 3.5µA quiescent current enables >10-year battery life in maintenance-free IoT edge nodes with manual activation. |
Use Scenario: Four-stage visual battery level indicator using discrete LEDs driven directly from comparator outputs. IC Role / Device Role / Timing Role: Each comparator output sources up to 40mA - sufficient to drive standard LEDs without current-limiting transistors or drivers. Use Value: Removes four discrete driver ICs or transistor stages, simplifying layout and reducing failure points in compact handheld devices. |
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; no hysteresis pin; 1mA supply current; open-collector outputs require pull-up. | Requires external reference and hysteresis circuitry; unsuitable for ultra-low-power battery systems. | Select when cost is primary constraint and system already includes reference; avoid for <10µA standby designs. |
| TLV3702IDR | Includes rail-to-rail I/O and 600nA quiescent current, but no integrated reference; hysteresis requires external feedback. | Lower power than LM393 but still needs external reference for precision thresholding; feedback-based hysteresis less stable over temp. | Prefer when higher speed (<350ns) is needed and reference is available elsewhere; not drop-in for MAX923CUA-T hysteresis topology. |
Compared with LM393DR and TLV3702IDR, the MAX923CUA-T uniquely integrates reference and hysteresis control in one 8-pin μMAX package, delivering verified 6µA operation, matched dual-channel behavior, and simplified layout - making it optimal for space-constrained, battery-critical applications where component count and long-term stability matter.
Availability
MAX923CUA-T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and window comparators requiring stable component supply, guaranteed commercial-temperature performance (0°C to +70°C), and long-lifecycle availability.
Supply support for MAX923CUA-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 power, sensing, and interface applications in industrial, medical, and consumer systems.
The MAX921–MAX924 family was engineered specifically for ultra-low-power voltage comparison in energy-sensitive systems - emphasizing micropower operation, integrated references, and robust hysteresis without external feedback.
FAQ
What is the maximum supply voltage for MAX923CUA-T in single-supply operation?
The MAX923CUA-T supports a single-supply voltage range of +2.5V to +11V. At +11V, it maintains full functionality including 40mA output sourcing, 12µs propagation delay, and ±1% reference accuracy across 0°C to +70°C. Exceeding +11V risks permanent damage per Absolute Maximum Ratings.
Does MAX923CUA-T support dual-supply operation, and how is it configured?
Yes, MAX923CUA-T operates from dual supplies of ±1.25V to ±5.5V. Connect V+ to positive rail, V− to negative rail, and leave GND unconnected. Inputs swing from V− to (V+ − 1.3V); outputs swing from V+ to V−. This configuration enables bipolar signal monitoring with TTL/CMOS compatibility at ±5V.
How is hysteresis implemented on MAX923CUA-T, and what is its maximum value?
Hysteresis on MAX923CUA-T is set via the HYST pin: connect R₁ between REF and HYST, and R₂ between HYST and V−. The hysteresis band equals ~2×(VREF − VHYST). Since HYST accepts voltages from (REF − 50mV) to REF, the maximum hysteresis band is 100mV - sufficient for noise suppression in most low-speed sensing applications.
Can MAX923CUA-T drive LEDs directly, and what is its output current capability?
Yes, MAX923CUA-T can drive standard LEDs directly. Each output continuously sources up to 40mA and sinks >5mA. At V+ = 5V, it delivers VOH ≥ 4.6V (IOUT = 10mA) and VOL ≤ 0.4V (IOUT = 0.8mA), enabling direct connection to 20mA LEDs with only a series resistor - no external driver required.
What is the input common-mode voltage range of MAX923CUA-T, and why does it matter?
The input common-mode voltage range of MAX923CUA-T is V− to (V+ − 1.3V). This allows inputs to reach the negative rail (e.g., ground in single-supply mode) and come within 1.3V of V+, enabling accurate monitoring of battery voltages, sensor outputs, and rail levels without level-shifting circuitry - critical for low-voltage system supervision.
MAX923CUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for MAX923CUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX923CUA-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 MAX923CUA-T reliable?
The price and inventory of MAX923CUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX923CUA-T is usually 5 days.
3.What payment methods are accepted for MAX923CUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX923CUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX923CUA-T?
MAX923CUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX923CUA-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 MAX923CUA-T?
For technical support, including MAX923CUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX923CUA-T requirements.
6.How does Aetrix verify that MAX923CUA-T is sourced from the original manufacturer or authorized distributors?
All MAX923CUA-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 MAX923CUA-T meets industry standards.
7.What is the process for return or replacement of MAX923CUA-T?
All MAX923CUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX923CUA-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 MAX923CUA-T part is unused and in its original packaging.
Return procedure for MAX923CUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX923CUA-T Tags
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