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Analog Devices Inc./Maxim Integrated MAX977EEE+
- Part No.:
- MAX977EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX977EEE+.pdf
- Description:
- IC COMPARATOR DUAL 16-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
The MAX977EEE+ from Maxim Integrated is a dual high-speed comparator with auto-standby and low-power modes, designed for +3V/+5V single-supply systems. It delivers 28ns propagation delay in high-speed mode, consumes only 250µA supply current per comparator in that mode, and drops to 3µA in low-power mode. Its rail-to-rail outputs interface directly with CMOS/TTL logic, and it supports independent timeout adjustment per channel via external capacitors on STOA/STOB pins - ideal for battery-powered IR receivers and threshold detection in RF ID tags.
For engineers reviewing the MAX977EEE+ datasheet, MAX977EEE+ pinout, MAX977EEE+ application, or MAX977EEE+ equivalent, key selection criteria include its dual-channel auto-standby timing control, ±1mV input offset voltage (typ), 2.7V–5.25V supply range, and QSOP-16 package compatibility with space-constrained portable designs.
Technical Context
The MAX977EEE+ implements two parallel comparator paths: a high-speed path (28ns tPD) and a low-power path (480ns tPD), dynamically selected by LP and STOA/STOB control logic. Its auto-standby mode triggers when either output remains static for an externally programmable timeout (tASB = 10 × CSTO µs), switching to low-power operation while preserving output state.
Each comparator features ground-sensing inputs with –0.2V to (VCC – 1.2V) common-mode range, rail-to-rail output drive without pull-ups, internal hysteresis (±0.3mV typ) in high-speed mode, and fault-tolerant I/O capable of continuous short-circuit to either rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.25V - supports direct integration into 3V and 5V logic domains without level-shifting. |
| Propagation Delay (High-Speed) | 28ns (typ) - enables reliable sampling of >10MHz signals in timing-critical detection circuits. |
| Supply Current (High-Speed) | 250µA per comparator - allows dual-channel operation with sub-0.5mA total quiescent draw at 3V. |
| Supply Current (Low-Power) | 3µA per comparator - extends battery life in intermittently active sensor wake-up systems. |
| Input Offset Voltage | ±1mV (max, TA = –40°C to +85°C) - ensures accurate threshold discrimination down to millivolt-level signal margins. |
| Common-Mode Input Range | –0.2V to (VCC – 1.2V) - permits ground-referenced input sensing while maintaining rail-to-rail output swing. |
| Output Drive Capability | Rail-to-rail, ISOURCE = 2mA / ISINK = 2mA - directly drives CMOS/TTL loads without external pull-up resistors. |
Pinout & Package
The MAX977EEE+ is housed in a 16-pin QSOP package (E16-1), with 0.65mm lead pitch and exposed pad not electrically connected. Pin functions are fully decoupled between channels A and B for independent configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 4, 5) | Positive supply input | Must be connected together; supplies both comparators and internal timing circuitry from single 2.7–5.25V source. |
| IN+ A/B (Pins 5, 12 / 2, 9) | Noninverting input per channel | Accepts signals down to –0.2V; used with IN– to define threshold crossing direction. |
| IN– A/B (Pins 6, 13 / 3, 10) | Inverting input per channel | Ground-sensing capability enables direct connection to 0V-referenced sensors. |
| OUT A/B (Pins 3, 11 / 7, 15) | Digital output per channel | Rail-to-rail CMOS-compatible output; no external pull-up required for logic interfacing. |
| STOA / STOB (Pins 1, 9) | Standby timeout programming | Connect external capacitor (e.g., 100pF → 1µs timeout); floating or grounded disables auto-standby per channel. |
| STAT A/B (Pins 7, 14 / 4, 5) | Mode status indicator | Open-drain capable of sourcing 3mA; high = low-power/auto-standby, low = high-speed active. |
| LP (Pin 11) | Global mode control | Drives both comparators: high = low-power, low = high-speed or auto-standby enabled. |
| GNDA / GNDB (Pins 2, 10 / 8, 16) | Analog ground return | Separate ground pins per channel reduce crosstalk in mixed-signal PCB layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Three selectable operating modes | Enables dynamic power/performance trade-off: high-speed (28ns), auto-standby (adaptive), or low-power (3µA). |
| Independent per-channel timeout | STOA/STOB pins allow asymmetric standby timing - critical for multi-sensor systems with staggered activity. |
| Rail-to-rail output without pull-ups | Reduces BOM count and board area; eliminates pull-up resistor thermal noise in precision threshold detection. |
| Internal hysteresis (high-speed mode) | ±0.3mV typical hysteresis prevents chatter on slow-moving or noisy inputs near trip points. |
| Fault-tolerant I/O | All pins withstand continuous short-circuit to VCC or GND - improves robustness in industrial or automotive environments. |
Applications
| IR Receivers | RF ID Tag Readers |
|---|---|
Use Scenario: Detecting modulated infrared pulses from remote controls or proximity sensors in handheld devices. IC Role / Device Role / Timing Role: Dual comparator acts as high-gain, low-noise signal discriminator - one channel for carrier envelope detection, second for data slicing. Use Value: Auto-standby cuts current to 3µA between bursts, extending coin-cell battery life beyond 1 year in intermittent-use applications. | Use Scenario: Decoding amplitude-modulated backscatter signals from passive RFID tags in access control or asset tracking. IC Role / Device Role / Timing Role: Threshold detector converting weak analog tag responses into clean digital logic levels for microcontroller input. Use Value: 28ns propagation delay ensures accurate timing capture of fast RFID protocols (e.g., ISO14443-A), while rail-to-rail outputs eliminate level-shifter components. |
| Keyless Entry Systems | Battery-Powered Threshold Detectors |
Use Scenario: Monitoring door handle capacitance or button press events in automotive key fobs with ultra-low standby power. IC Role / Device Role / Timing Role: Dual-channel comparator monitors differential sensor pairs for tamper detection and button actuation simultaneously. Use Value: Independent STOA/STOB timeout tuning allows one channel to stay awake for immediate response while the other sleeps - reducing average system current by >95%. | Use Scenario: Monitoring battery voltage, temperature, or sensor thresholds in portable medical or IoT edge nodes. IC Role / Device Role / Timing Role: Precision window comparator (using both channels) detecting undervoltage/overvoltage conditions with hysteresis. Use Value: ±1mV max input offset ensures <10mV total error budget in 3.3V systems, enabling reliable low-voltage brown-out protection without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | No auto-standby; fixed 1.2mA supply current per comparator; 1.3µs propagation delay; open-collector outputs require pull-ups. | Suitable for cost-sensitive, non-battery applications where timing and power are secondary. | Choose LM393DR only if design lacks space for timeout capacitors and tolerates higher quiescent current and slower response. |
| TLV3702IDR | Single-supply operation (1.8–5.5V); 350ns tPD; 850nA supply current; no auto-standby; rail-to-rail output. | Better for ultra-low-power always-on monitoring, but lacks dynamic speed/power switching capability. | Select TLV3702IDR when lowest possible sleep current (<1µA) is mandatory and 350ns delay is acceptable. |
Compared with LM393DR and TLV3702IDR, the MAX977EEE+ uniquely combines sub-3µA low-power operation, 28ns high-speed response, and per-channel auto-standby - making it the only option for battery-powered systems requiring both burst-mode responsiveness and multi-year standby life.
Availability
The MAX977EEE+ is available at Aetrix Electronics and suitable for battery-powered systems, RF ID tag readers, and keyless entry applications requiring stable component supply across extended production lifecycles.
Supply support for MAX977EEE+ 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 markets.
The MAX977EEE+ belongs to Maxim's high-performance comparator product line, engineered specifically for energy-constrained systems needing adaptive speed/power control without sacrificing timing accuracy or noise immunity.
FAQ
What are the three operating modes of the MAX977EEE+ and how are they controlled?
The MAX977EEE+ supports high-speed mode, high-speed mode with auto-standby, and low-power mode. High-speed mode is active when LP is low and STOA/STOB are grounded or driven low. Auto-standby activates when LP is low and STOA/STOB have external capacitors; the comparator transitions to low-power after timeout. Low-power mode engages when LP is high. All modes retain rail-to-rail output functionality and fault tolerance. The MAX977EEE+ uses dedicated STAT pins to indicate real-time mode status per channel.
How is the auto-standby timeout period set for each comparator in the MAX977EEE+?
The auto-standby timeout for each comparator in the MAX977EEE+ is independently programmed using an external capacitor connected from STOA to GND (for Channel A) or STOB to GND (for Channel B). The relationship is tASB = 10 × C µs, where C is capacitance in pF - e.g., a 100pF capacitor yields a 1µs timeout. Driving STOA or STOB to GND disables auto-standby for that channel. The MAX977EEE+ datasheet specifies leakage <1nA for timing accuracy, recommending ceramic capacitors.
Does the MAX977EEE+ require external pull-up resistors on its outputs?
No, the MAX977EEE+ does not require external pull-up resistors. Its outputs are fully rail-to-rail CMOS-compatible and can source/sink up to 2mA while maintaining valid logic levels across the full supply range (2.7V–5.25V). This eliminates BOM components and associated thermal noise, simplifying layout in noise-sensitive threshold detection circuits. The MAX977EEE+ maintains this capability in all three operating modes - high-speed, auto-standby, and low-power.
What is the input common-mode voltage range specification for the MAX977EEE+?
The MAX977EEE+ has an input common-mode voltage range of –0.2V to (VCC – 1.2V), specified over the full operating temperature range (–40°C to +85°C). This allows direct sensing of ground-referenced signals while ensuring correct comparator behavior. Although inputs tolerate voltages beyond this range (including rail-to-rail differential swing), output validity is guaranteed only when at least one input resides within the common-mode window. The MAX977EEE+'s input stage remains functional even with one input at GND and the other at VCC.
Can the MAX977EEE+ operate from a 3.3V supply, and what performance is guaranteed at that voltage?
Yes, the MAX977EEE+ is fully specified for operation from 3.3V (within its 2.7V–5.25V range). At VCC = 3.3V, it guarantees 28ns propagation delay in high-speed mode, ±1mV input offset voltage (max), 250µA supply current per comparator, and rail-to-rail output swing from 0V to 3.3V. The auto-standby timeout equation (tASB = 10 × C µs) remains valid, and STAT pins retain 3mA sourcing capability. All electrical characteristics in the MAX977EEE+ datasheet apply across the entire supply range without derating.
MAX977EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- 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:
- -
- :
- -
MAX977EEE+ FAQ
1.How can I place an order for MAX977EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX977EEE+ 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 MAX977EEE+ reliable?
The price and inventory of MAX977EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX977EEE+ is usually 5 days.
3.What payment methods are accepted for MAX977EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX977EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX977EEE+?
MAX977EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX977EEE+ 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 MAX977EEE+?
For technical support, including MAX977EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX977EEE+ requirements.
6.How does Aetrix verify that MAX977EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX977EEE+ 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 MAX977EEE+ meets industry standards.
7.What is the process for return or replacement of MAX977EEE+?
All MAX977EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX977EEE+, 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 MAX977EEE+ part is unused and in its original packaging.
Return procedure for MAX977EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX977EEE+ Tags
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LM2903DR
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LM339DR
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LM339PWR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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LM393ADR
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NCX2200GMAZ
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