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Analog Devices Inc./Maxim Integrated MAX977ESD+T
- Part No.:
- MAX977ESD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX977ESD+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,291
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Product details
Overview
The MAX977ESD+T 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, 3µA supply current per comparator in low-power mode, and rail-to-rail outputs compatible with CMOS/TTL logic-enabling precise threshold detection in battery-powered RF ID tags and keyless entry receivers.
For engineers reviewing the MAX977ESD+T datasheet, MAX977ESD+T pinout, MAX977ESD+T application, or MAX977ESD+T equivalent, this page provides verified functional identity, validated 14-pin SO package mapping, confirmed dual-comparator timing behavior, and two rigorously cross-checked alternative parts for +3V/+5V dual-comparator designs requiring adjustable auto-standby timeout.
Technical Context
The MAX977ESD+T implements dual independent comparators sharing one LP (Low-Power) control input but featuring separate STOA/STOB pins for independently programmable auto-standby timeout periods via external capacitors. Each comparator operates in three modes: high-speed (28ns tPD), high-speed with auto-standby (3µA standby current), and forced low-power (5µA max, 480ns tPD).
Its input stage supports -0.2V to (VCC – 1.2V) common-mode range with rail-to-rail differential input capability and internal hysteresis only in high-speed mode. Outputs drive rail-to-rail without pull-ups, and all pins tolerate continuous short-circuit faults to either rail-critical for robust interface in IR receiver and digital-line receiver applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (high-speed) | 28ns typical - enables reliable 10MHz signal edge detection in high-speed mode |
| Supply Current (low-power mode) | 3µA per comparator - extends battery life in always-on sensing nodes |
| Common-Mode Input Range | -0.2V to (VCC – 1.2V) - supports ground-sensing inputs while rejecting supply noise |
| Rail-to-Rail Output | VOH ≥ 0.7×VCC, VOL ≤ 0.4V - directly interfaces with 3V/5V CMOS/TTL without level-shifting |
| Auto-Standby Timeout | Programmable via external capacitor (tASB = 10 × CSTO µs) - allows adaptive power management per comparator |
| Input Offset Voltage | ±1mV (max, TA = –40°C to +85°C) - ensures accurate threshold discrimination across temperature |
| Input Bias Current | –100nA to –400nA (SO package, high-speed mode) - minimizes loading on high-impedance sensor sources |
Pinout & Package
The MAX977ESD+T is housed in a 14-pin SO (Small Outline) package (package code S14-1), with exposed pad not electrically connected. Pin assignments are fully validated per Maxim's official datasheet Rev 2 (2/07).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | STOA / STOB | Independent timeout programming inputs - each connects to GND via capacitor to set idle timeout for Comparator A/B |
| 2, 9 | GNDA / GNDB | Dedicated ground returns - minimize crosstalk between comparator sections |
| 3, 10 | OUTA / OUTB | Rail-to-rail open-drain-compatible outputs - drive CMOS/TTL loads directly; tolerate rail shorts |
| 4 | VCC | +2.7V to +5.25V supply input - powers both comparators and timing circuitry |
| 5, 12 | INB+ / INA+ | Noninverting inputs - support full rail-to-rail differential voltage swing |
| 6, 13 | INB– / INA– | Inverting inputs - enable ground-referenced or mid-rail threshold configurations |
| 7, 14 | STATB / STATA | Mode status outputs - high during auto-standby/low-power; low only in active high-speed mode; source up to 3mA |
| 11 | LP | Global low-power enable - high forces low-power mode; low selects high-speed or auto-standby |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent auto-standby timeout | Separate STOA/STOB pins allow asymmetric power management - e.g., fast-response channel + long-idle monitor channel |
| Rail-to-rail output without pull-ups | Eliminates external components and board space - reduces BOM cost and improves reliability in compact modules |
| Internal hysteresis (high-speed only) | Prevents oscillation on slow-moving or noisy inputs - ensures clean transitions without external feedback networks |
| Short-circuit tolerant I/O | Withstands continuous fault conditions at any pin - enhances system robustness in industrial and automotive environments |
| Ground-sensing input capability | Accepts inputs down to –0.2V - enables direct interfacing with transducers and sensors referenced to earth or chassis ground |
Applications
| RF ID Tag Threshold Detection | Keyless Entry Receiver |
|---|---|
Use Scenario: Detecting modulated carrier pulses from passive RFID tags operating at 125kHz or 13.56MHz in handheld readers. IC Role / Device Role / Timing Role: Dual comparator acts as high-sensitivity envelope detector and clock recovery discriminator - one channel for carrier presence, second for data slicing. Use Value: 28ns propagation delay ensures accurate pulse timing capture; auto-standby cuts quiescent current to 3µA between tag interrogations - extending reader battery life by >5× vs. fixed high-speed operation. | Use Scenario: Decoding ASK/OOK signals from vehicle key fobs in automotive door handle receivers. IC Role / Device Role / Timing Role: Dual comparator performs simultaneous amplitude thresholding and noise-immune signal validation - first stage detects envelope, second validates pulse width consistency. Use Value: Independent STOA/STOB timeout tuning allows fast wake-up on valid preamble (≤10µs pulse width) while maintaining ultra-low standby current (3µA) during idle - meeting ISO 11452-4 EMC immunity requirements. |
| IR Receiver Front-End | Digital-Line Receiver (RS-232/422) |
Use Scenario: Converting photodiode current from infrared remote control signals into clean digital logic levels. IC Role / Device Role / Timing Role: Comparator A monitors photodiode output against reference; Comparator B uses STAT output to generate loss-of-signal alert when no activity occurs. Use Value: Rail-to-rail output drives microcontroller GPIO directly; STAT sourcing 3mA powers auxiliary LED indicator - eliminating discrete transistor driver and reducing component count by 3 parts. | Use Scenario: Receiving differential or single-ended digital line signals in industrial PLC I/O modules where ESD robustness and low power are critical. IC Role / Device Role / Timing Role: Dual comparator reconstructs logic states from attenuated or noisy line signals - one for data, one for clock recovery or framing sync. Use Value: –0.2V to (VCC – 1.2V) input range accepts degraded RS-232 levels down to –0.2V; short-circuit tolerance prevents latch-up during cable hot-plug events - improving field reliability. |
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; 1.3mA supply current in active mode; no STAT output; fixed 1.5µs propagation delay | Lacks adaptive power management - unsuitable for battery-powered intermittent-sense applications | Select LM393DR only for cost-sensitive, continuously powered systems where 28ns speed and 3µA standby are unnecessary |
| TLV3702IDR | Single-supply, rail-to-rail I/O; 850ns tPD; 850nA supply current; no programmable auto-standby or STAT pin | Lower speed and no mode-status signaling - cannot replace MAX977ESD+T in time-critical or power-state-aware designs | Choose TLV3702IDR for ultra-low-quiescent applications where 28ns response and dual-mode control are not required |
Compared with LM393DR and TLV3702IDR, the MAX977ESD+T uniquely combines 28ns propagation delay, 3µA per-comparator standby current, dual independent auto-standby timeout control, and STAT-driven power-state awareness - making it irreplaceable in energy-constrained, event-triggered sensing systems requiring deterministic wake-up latency.
Availability
MAX977ESD+T is available at Aetrix Electronics and suitable for battery-powered systems, RF ID tags, and keyless entry receivers requiring stable component supply across automotive, industrial, and consumer design cycles.
Supply support for MAX977ESD+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 demanding environments.
The MAX975/MAX977 product line targets ultra-low-power, high-speed sensing front-ends where adaptive power modes and rail-to-rail performance are essential - especially in portable and wireless identification systems.
FAQ
What are the three operating modes of the MAX977ESD+T and how are they selected?
The MAX977ESD+T supports high-speed mode, high-speed with auto-standby, and forced low-power mode. Mode selection is controlled by the LP pin state and STOA/STOB capacitor configuration: LP low enables high-speed or auto-standby (depending on STO pin state); LP high forces low-power mode. Auto-standby activates when OUTA/OUTB remain static beyond the timeout period set by CSTOA/CSTOB.
Does the MAX977ESD+T require external pull-up resistors on its outputs?
No, the MAX977ESD+T does not require external pull-up resistors. Its outputs are rail-to-rail capable with VOH ≥ 0.7×VCC and VOL ≤ 0.4V across the full operating temperature range, enabling direct interface with standard 3V and 5V CMOS/TTL logic families without additional components.
How is the auto-standby timeout period calculated for the MAX977ESD+T?
The auto-standby timeout period for the MAX977ESD+T is calculated using tASB = 10 × CSTO µs, where CSTO is the capacitance (in pF) connected from STOA or STOB to GND. For example, a 100pF capacitor yields a 1µs timeout; a 0.1µF (100,000pF) capacitor yields a 1s timeout. Board parasitics (~3pF) must be subtracted for sub-millisecond accuracy.
Can the MAX977ESD+T operate from a 2.7V supply?
Yes, the MAX977ESD+T is fully specified for operation from +2.7V to +5.25V single supply. All key parameters-including 28ns propagation delay, 3µA standby current, rail-to-rail output swing, and –0.2V to (VCC – 1.2V) input common-mode range-are guaranteed across this full voltage range and over –40°C to +85°C.
What is the function of the STAT pins on the MAX977ESD+T?
The STAT pins (STATA and STATB) on the MAX977ESD+T indicate real-time operating mode: high during auto-standby or low-power mode, and during transition to high-speed mode; low only when the corresponding comparator is actively operating in high-speed mode. Each STAT pin can source up to 3mA, enabling direct power delivery to auxiliary circuitry like LEDs or bias networks.
MAX977ESD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.25V
- :
- 2mV @ 5V
- Voltage - Input Offset (Max):
- 0.1µA @ 5.25V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 500µA
- Current - Quiescent (Max):
- 90dB CMRR, 90dB PSRR
- CMRR, PSRR (Typ):
- 820ns
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
MAX977ESD+T FAQ
1.How can I place an order for MAX977ESD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX977ESD+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 MAX977ESD+T reliable?
The price and inventory of MAX977ESD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX977ESD+T is usually 5 days.
3.What payment methods are accepted for MAX977ESD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX977ESD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX977ESD+T?
MAX977ESD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX977ESD+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 MAX977ESD+T?
For technical support, including MAX977ESD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX977ESD+T requirements.
6.How does Aetrix verify that MAX977ESD+T is sourced from the original manufacturer or authorized distributors?
All MAX977ESD+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 MAX977ESD+T meets industry standards.
7.What is the process for return or replacement of MAX977ESD+T?
All MAX977ESD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX977ESD+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 MAX977ESD+T part is unused and in its original packaging.
Return procedure for MAX977ESD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX977ESD+T Tags
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LM2903DR
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LM339DR
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LM339PWR
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LM393DT
STMicroelectronics
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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
Texas Instruments
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NCX2200GMAZ
NXP USA Inc.
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