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Analog Devices Inc./Maxim Integrated MAX921CSA-TG077
- Part No.:
- MAX921CSA-TG077
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX921CSA-TG077.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,570
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Product details
Overview
The MAX921CSA-TG077 from Maxim Integrated is a single, ultra-low-power, rail-to-rail input comparator with integrated 1.182V ±1% bandgap reference, programmable hysteresis via HYST pin, and TTL/CMOS-compatible output capable of sourcing up to 40mA. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), features 4μA max quiescent current over –40°C to +85°C, and supports battery-powered threshold detection in portable instrumentation.
For engineers reviewing the MAX921CSA-TG077 datasheet, MAX921CSA-TG077 pinout, MAX921CSA-TG077 application, or MAX921CSA-TG077 equivalent, key selection criteria include guaranteed hysteresis implementation without external feedback, internal reference accuracy over temperature, output drive capability into capacitive loads, and compatibility with 3V/5V systems requiring low standby power.
Technical Context
The MAX921CSA-TG077 integrates a micropower comparator core with a precision 1.182V reference referenced to V−, not GND. Its unique output stage eliminates crowbar current during transitions, minimizing supply-line parasitic feedback and enabling stable operation without stringent PCB layout constraints.
Input common-mode range extends from V− to (V+ − 1.3V); the HYST pin accepts 0–50mV below REF to set symmetric hysteresis bands up to 100mV. Propagation delay is 12μs (10mV overdrive, 100pF load) and remains functional down to 2.5V supply, though reference operation degrades below ~2.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply; enables direct use in 3V/5V battery systems and industrial rails. |
| Quiescent Current | ≤4μA over –40°C to +85°C; ensures multi-year operation on coin-cell batteries. |
| Reference Voltage | 1.182V ±1% (0°C to +70°C); provides stable, factory-trimmed threshold for precision level sensing. |
| Output Drive | Sources ≥40mA continuously; directly drives LEDs, small relays, or logic inputs without external buffers. |
| Propagation Delay | 12μs at 10mV overdrive; supports medium-speed window detection and oscillator timing. |
| Input Common-Mode Range | V− to (V+ − 1.3V); allows sensing near ground or high-side signals in single-supply configurations. |
| Hysteresis Control | HYST pin accepts REF − 0.05V to REF; enables precise, resistor-programmable hysteresis without feedback networks. |
Pinout & Package
MAX921CSA-TG077 is housed in an 8-pin SO (Small Outline) package, surface-mount compatible with standard 1.27mm pitch PCB assembly.
| 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 rail; tied to GND in single-supply mode; sets reference baseline. |
| 3 | IN+ | Noninverting comparator input; accepts signals from V− to (V+ − 1.3V). |
| 4 | IN− | Inverting comparator input; same voltage range as IN+; used for threshold comparison. |
| 5 | HYST | Hysteresis control input; voltage relative to REF sets hysteresis band width (0–50mV below REF). |
| 6 | REF | 1.182V reference output referenced to V−; supplies stable bias for external resistive dividers. |
| 7 | V+ | Positive supply rail; supports up to +11V; defines upper output swing limit. |
| 8 | OUT | Push-pull output; sinks and sources current; swings fully from V+ to GND; TTL/CMOS compatible. |
Key Features
| Feature | Design Value |
|---|---|
| No crowbar switching current | Eliminates supply-line glitches during output transitions, reducing need for local bypassing and improving system stability. |
| Internal 1.182V ±1% reference | Removes external reference IC or resistor divider, cutting BOM count and drift-related errors in portable sensors. |
| Programmable hysteresis via HYST pin | Enables precise noise immunity tuning with only two resistors-no op-amp feedback loop or layout-sensitive traces. |
| 40mA continuous source current | Drives multiple LEDs or logic gates directly, avoiding discrete transistor stages in low-power indicator circuits. |
| Rail-to-rail input range | Supports detection of signals near GND or near V+ in single-supply systems, e.g., battery voltage monitoring from 0V to full charge. |
Applications
| Battery Voltage Monitor | Auto-Shutoff Power Switch |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger under-voltage lockout or over-voltage protection. IC Role / Device Role / Timing Role: Single comparator compares divided battery voltage against internal 1.182V reference to assert shutdown signal. Use Value: 4μA quiescent current extends shelf life; programmable hysteresis prevents chatter near cutoff thresholds. |
Use Scenario: Enabling timed power delivery to peripheral circuits (e.g., sensor nodes) after wake-up, then auto-disabling. IC Role / Device Role / Timing Role: Comparator output drives MOSFET gate; RC network on IN+ sets delay before OUT goes low. Use Value: Internal reference and hysteresis eliminate external components; 40mA output drives gate directly without buffer. |
| LED Bar-Graph Indicator | Level Shifter (±5V to TTL) |
|
Use Scenario: Visual indication of analog signal level (e.g., audio peak, battery charge) using discrete LED segments. IC Role / Device Role / Timing Role: Four MAX921CSA-TG077 units compare scaled input against stepped reference voltages. Use Value: 40mA source current drives LEDs at full brightness without series resistors; low IQ preserves system efficiency. |
Use Scenario: Converting bipolar industrial sensor outputs (±5V) into clean 0V/5V logic levels for microcontroller ADC or GPIO. IC Role / Device Role / Timing Role: Comparator compares input against 0V (GND), using internal reference to define trip point. Use Value: Input range includes negative rail; output swings to GND ensures valid TTL low; no external bias required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3701IDBVR | Single 1.8V–16V comparator with 1.2μA IQ, no internal reference, open-drain output. | Requires external reference and pull-up; better for ultra-low-power wake-up, worse for direct LED drive. | Select when lowest possible IQ is critical and output loading is light. |
| LMV331M5X | Single 2.7V–5.5V comparator with 22μA IQ, rail-to-rail input, push-pull output, no reference. | Higher supply current; lacks integrated reference; suitable only with external voltage divider or reference. | Select when operating strictly at 3.3V and internal reference is unnecessary. |
Compared with TLV3701IDBVR and LMV331M5X, the MAX921CSA-TG077 uniquely combines ultra-low IQ, integrated ±1% reference, and 40mA source drive-enabling self-contained, component-minimized threshold detection where precision, power, and drive strength are jointly constrained.
Availability
MAX921CSA-TG077 is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across commercial and extended temperature ranges.
Supply support for MAX921CSA-TG077 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 portable electronics.
The MAX921CSA-TG077 belongs to the MAX921–MAX924 micropower comparator family, engineered specifically for ultra-low-power, single-supply sensing systems where internal reference accuracy, hysteresis simplicity, and robust output drive are essential.
FAQ
What is the maximum supply voltage for MAX921CSA-TG077 in single-supply operation?
The MAX921CSA-TG077 supports a single-supply voltage range of +2.5V to +11V. At +11V, it maintains full functionality including 4μA max quiescent current, 1.182V reference accuracy, and 40mA output sourcing. Exceeding +11V risks permanent damage per Absolute Maximum Ratings.
Does MAX921CSA-TG077 require external hysteresis components?
No-MAX921CSA-TG077 implements programmable hysteresis internally via the HYST pin. Connecting two resistors between REF, HYST, and V− sets hysteresis bands up to 100mV without feedback loops, op-amps, or layout-sensitive traces. If unused, HYST is tied to REF.
Can MAX921CSA-TG077 operate from a dual ±5V supply?
Yes-MAX921CSA-TG077 operates from dual supplies ranging ±1.25V to ±5.5V. With ±5V, its output swings from V+ (+5V) to GND (0V), ensuring TTL compatibility. The internal reference remains referenced to V− (–5V), so REF = –5V + 1.182V = –3.818V.
What is the input voltage range for MAX921CSA-TG077 when V+ = 5V and V− = GND?
When powered from 5V single supply (V+ = 5V, V− = GND), the input common-mode range of MAX921CSA-TG077 is 0V to 3.7V (V− to V+ − 1.3V). Signals at IN+ or IN− must stay within this window for guaranteed comparator operation and offset specification compliance.
Is the reference output of MAX921CSA-TG077 referenced to GND or V−?
The REF pin of MAX921CSA-TG077 outputs 1.182V with respect to V−, not GND. In single-supply operation (V− = GND), REF = 1.182V. In dual-supply operation (e.g., V+ = +5V, V− = –5V), REF = –5V + 1.182V = –3.818V. This must be accounted for in resistor-divider design.
MAX921CSA-TG077 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:
- 1
- 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):
- 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-SOIC
MAX921CSA-TG077 FAQ
1.How can I place an order for MAX921CSA-TG077 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX921CSA-TG077 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 MAX921CSA-TG077 reliable?
The price and inventory of MAX921CSA-TG077 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX921CSA-TG077 is usually 5 days.
3.What payment methods are accepted for MAX921CSA-TG077?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX921CSA-TG077 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX921CSA-TG077?
MAX921CSA-TG077 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX921CSA-TG077 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 MAX921CSA-TG077?
For technical support, including MAX921CSA-TG077 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX921CSA-TG077 requirements.
6.How does Aetrix verify that MAX921CSA-TG077 is sourced from the original manufacturer or authorized distributors?
All MAX921CSA-TG077 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 MAX921CSA-TG077 meets industry standards.
7.What is the process for return or replacement of MAX921CSA-TG077?
All MAX921CSA-TG077 units undergo pre-shipment inspection (PSI). If there is an issue with MAX921CSA-TG077, 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 MAX921CSA-TG077 part is unused and in its original packaging.
Return procedure for MAX921CSA-TG077:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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