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Analog Devices Inc./Maxim Integrated MAX991ESA+TG077
- Part No.:
- MAX991ESA+TG077
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX991ESA+TG077.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:3,420
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Product details
Overview
MAX991ESA+TG077 from Maxim Integrated is a dual micropower comparator with push-pull outputs, rail-to-rail inputs/outputs, and 120ns propagation delay at 5V supply. It operates from +2.5V to +5.5V (or ±1.25V to ±2.75V), draws only 48μA per comparator, and features ±0.5mV typical input offset voltage and ±2.5mV internal hysteresis. It is used in battery-powered zero-crossing detectors and threshold monitoring circuits.
For engineers reviewing the MAX991ESA+TG077 datasheet, MAX991ESA+TG077 pinout, MAX991ESA+TG077 application, or MAX991ESA+TG077 equivalent, key selection criteria include dual-channel push-pull output capability, 120ns timing performance under 5V/2.7V operation, rail-to-rail common-mode range extending 250mV beyond rails, and compatibility with space-constrained industrial sensor interfaces.
Technical Context
The MAX991ESA+TG077 implements two independent high-speed comparators sharing a single 8-pin SO package. Each channel features rail-to-rail input stage with ±0.25V beyond-rail common-mode range and push-pull output capable of sourcing/sinking 8mA while maintaining rail-to-rail swing. Internal hysteresis ensures clean switching with slow-moving signals without external components.
Its unique output stage minimizes supply-current surges during transitions-limiting dynamic current spikes that cause supply glitches-enabling stable operation in noise-sensitive analog front-ends. The device is fully specified over –40°C to +85°C and supports both single-supply (2.5V–5.5V) and dual-supply (±1.25V–±2.75V) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V single supply; enables direct use in 3V and 5V systems without level shifting |
| Propagation Delay | 120ns at 100mV overdrive, VCC = 5V, CL = 15pF - supports high-speed signal discrimination up to ~4MHz |
| Quiescent Current | 48μA per comparator at VCC = 2.7V - extends battery life in portable instrumentation |
| Input Offset Voltage | ±0.5mV typical - ensures accurate threshold detection within sub-millivolt windows |
| Common-Mode Range | VEE − 0.25V to VCC + 0.25V - allows inputs to exceed supply rails by 250mV without phase reversal |
| Output Drive | Sinks/sources 8mA with rail-to-rail swing - directly drives LEDs, logic inputs, or small MOSFET gates |
| Input Bias Current | 1.0pA typical - preserves signal integrity in high-impedance sensor interfaces (e.g., photodiode amps) |
Pinout & Package
MAX991ESA+TG077 is housed in an 8-pin SO (Small Outline) package (package code S8-2), measuring 4.9mm × 6.0mm × 1.75mm, RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A push-pull output - actively drives high/low; no external pullup required |
| 2 | VCC | Positive supply input - accepts +2.5V to +5.5V; decoupling capacitor must be placed adjacent |
| 3 | INA− | Comparator A inverting input - differential pair node; high-impedance (1pA bias), rail-to-rail capable |
| 4 | INA+ | Comparator A noninverting input - same electrical characteristics as INA−; supports over-rail inputs |
| 5 | VEE | Negative supply input - tied to GND in single-supply mode; sets lower rail for dual-supply operation |
| 6 | INB+ | Comparator B noninverting input - electrically isolated from Channel A; identical specs and layout rules |
| 7 | INB− | Comparator B inverting input - matches INA− performance; supports independent reference configuration |
| 8 | OUTB | Comparator B push-pull output - independently controllable; shares VCC/VEE but not internal nodes |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O with extended common-mode range | Inputs operate from VEE − 0.25V to VCC + 0.25V; outputs swing within 0.2V of rails at 8mA load |
| Low-glitch push-pull output architecture | Minimizes supply-current transients during switching - eliminates need for large local bypass capacitors |
| Internal hysteresis | ±2.5mV built-in - prevents chatter on noisy or slowly varying inputs without external feedback resistors |
| Micropower operation | 48μA per comparator at 2.7V - enables always-on sensing in energy-harvesting and wearable devices |
| High-speed response | 120ns propagation delay with 15pF load - supports real-time edge detection in motor control and data acquisition |
Applications
| Zero-Crossing Detection | Threshold Monitoring |
|---|---|
|
Use Scenario: Detecting AC waveform polarity transitions in audio line receivers or mains-synchronized power supplies. IC Role / Device Role / Timing Role: Dual comparator configured as precision zero-cross detector with independent hysteresis per channel. Use Value: 120ns delay enables accurate timing alignment for TRIAC triggering or sampling clock generation. |
Use Scenario: Monitoring battery voltage against low-charge and over-voltage thresholds in portable medical devices. IC Role / Device Role / Timing Role: Two independent comparators comparing sensed voltage to fixed references (e.g., 3.0V and 4.2V). Use Value: 48μA quiescent current per channel allows continuous monitoring without compromising standby battery life. |
| Level Translation Interface | IR Signal Demodulation |
|
Use Scenario: Converting 5V microcontroller GPIO outputs to 3.3V logic levels for interfacing with low-voltage peripherals. IC Role / Device Role / Timing Role: Comparator used as active-level shifter with rail-to-rail output swing matching target logic family. Use Value: Push-pull output eliminates need for external pullup resistor - reduces BOM count and PCB area. |
Use Scenario: Decoding modulated infrared carrier signals (e.g., 38kHz) in remote control receivers. IC Role / Device Role / Timing Role: High-speed comparator detecting envelope peaks of amplified IR photodiode output. Use Value: 1.0pA input bias current preserves weak signal integrity from high-impedance photodiode preamps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Open-drain output; 1.3mA supply current per comparator; no rail-to-rail inputs; 1.5μs propagation delay | Requires external pullup; unsuitable for rail-to-rail sensor inputs or low-power battery operation | Choose LM393DR only when cost is primary constraint and speed/power are secondary |
| TLV3702IDR | Push-pull output; 850nA supply current; 360ns propagation delay; rail-to-rail inputs only (not outputs) | Lower power than MAX991ESA+TG077 but slower; output swing limited to ~0.7V from rails at 1mA load | Prefer TLV3702IDR for ultra-low-power wake-up circuits where 360ns delay is acceptable |
Compared with LM393DR and TLV3702IDR, MAX991ESA+TG077 uniquely balances 120ns speed, 48μA quiescent current, full rail-to-rail I/O, and push-pull drive - making it optimal for compact, battery-powered signal-conditioning stages requiring precise timing and minimal external components.
Availability
MAX991ESA+TG077 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and battery-powered communication modules requiring stable component supply across extended temperature ranges.
Supply support for MAX991ESA+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, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX991ESA+TG077 belongs to Maxim's high-speed micropower comparator family, engineered for low-voltage, low-noise signal conditioning in space- and power-constrained systems.
FAQ
What is the operating temperature range for MAX991ESA+TG077?
The MAX991ESA+TG077 is fully specified over the industrial temperature range of –40°C to +85°C. All electrical parameters-including propagation delay, input offset voltage, and supply current-are guaranteed across this range. This makes MAX991ESA+TG077 suitable for deployment in outdoor sensors, factory automation equipment, and automotive cabin modules where ambient temperatures fluctuate widely.
Does MAX991ESA+TG077 support dual-supply operation?
Yes, MAX991ESA+TG077 supports dual-supply operation from ±1.25V to ±2.75V. When using dual supplies, VCC connects to the positive rail and VEE to the negative rail. Input common-mode range extends 0.25V beyond each rail, and output swing remains rail-to-rail. This configuration is commonly used in bipolar signal processing stages such as audio comparators or op-amp-based window detectors.
Can MAX991ESA+TG077 drive an LED directly?
Yes, MAX991ESA+TG077 can drive a standard indicator LED directly via its push-pull output. With 8mA sourcing/sinking capability and rail-to-rail swing, it delivers up to ~4.6V high-level output at 5V supply and <0.4V low-level output-sufficient to forward-bias most red/green LEDs with a series resistor. For reliability, limit current to ≤6mA using a 470Ω–1kΩ resistor at 5V.
Is there internal hysteresis in MAX991ESA+TG077, and can it be adjusted?
Yes, MAX991ESA+TG077 includes ±2.5mV internal hysteresis per comparator to prevent oscillation on slow or noisy inputs. This hysteresis is fixed and non-adjustable. External hysteresis can be added using positive feedback resistors, but doing so increases response time and requires careful calculation to avoid degrading accuracy-refer to Maxim Application Note AN641 for design equations specific to MAX991ESA+TG077.
What package type is used for MAX991ESA+TG077, and is it RoHS-compliant?
MAX991ESA+TG077 uses an 8-pin SO (Small Outline) package (JEDEC MS-012AC), with dimensions 4.9mm × 6.0mm × 1.75mm and gull-wing leads. The "+" suffix in TG077 indicates RoHS-compliant lead finish (Pb-free matte tin). This package is compatible with standard reflow profiles and supports automated optical inspection (AOI) due to its exposed pad-free, surface-mount construction.
MAX991ESA+TG077 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
MAX991ESA+TG077 FAQ
1.How can I place an order for MAX991ESA+TG077 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX991ESA+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 MAX991ESA+TG077 reliable?
The price and inventory of MAX991ESA+TG077 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX991ESA+TG077 is usually 5 days.
3.What payment methods are accepted for MAX991ESA+TG077?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX991ESA+TG077 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX991ESA+TG077?
MAX991ESA+TG077 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX991ESA+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 MAX991ESA+TG077?
For technical support, including MAX991ESA+TG077 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX991ESA+TG077 requirements.
6.How does Aetrix verify that MAX991ESA+TG077 is sourced from the original manufacturer or authorized distributors?
All MAX991ESA+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 MAX991ESA+TG077 meets industry standards.
7.What is the process for return or replacement of MAX991ESA+TG077?
All MAX991ESA+TG077 units undergo pre-shipment inspection (PSI). If there is an issue with MAX991ESA+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 MAX991ESA+TG077 part is unused and in its original packaging.
Return procedure for MAX991ESA+TG077:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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