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Analog Devices Inc./Maxim Integrated MAX975ESA+
- Part No.:
- MAX975ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX975ESA+.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:489
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Product details
Overview
The MAX975ESA+ from Maxim Integrated is a single, +3V/+5V rail-to-rail input/output comparator with three configurable operating modes: high-speed (28ns propagation delay), auto-standby, and low-power (3µA supply current). It features ground-sensing inputs, internal hysteresis in high-speed mode, and an adjustable timeout period set by an external capacitor on the STO pin. It is widely used in battery-powered IR receivers and threshold detection circuits where dynamic power scaling is critical.
For engineers reviewing the MAX975ESA+ datasheet, MAX975ESA+ pinout, MAX975ESA+ application, or MAX975ESA+ equivalent, this page delivers verified technical context, real-world timing behavior, package-specific thermal limits, confirmed auto-standby timeout calibration, and validated alternatives for low-power comparator selection in 3V embedded systems.
Technical Context
The MAX975ESA+ implements dual-path comparator architecture: a fast high-speed comparator (28ns tPD) and a slower low-power comparator (480ns tPD), dynamically selected via LP and STO control logic. Its auto-standby mode triggers when OUT remains static for a user-defined timeout (tASB = 10 × CSTO µs), switching to low-power operation while preserving output state and enabling STAT-driven power gating of peripheral circuitry.
Input stage supports common-mode range from –0.2V to (VCC – 1.2V), with rail-to-rail differential input capability and ±3mV max input offset voltage over temperature. Output drives CMOS/TTL directly without pull-ups, sinking/sourcing up to 400µA/3mA respectively, and tolerates continuous short-circuit faults to either rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.25V - supports direct interface with Li-ion, 3.3V, and 5V logic domains without level shifters |
| High-Speed Propagation Delay | 28ns typical - enables reliable sampling of >10MHz signals in IR receiver front-ends |
| Low-Power Supply Current | 3µA max - extends battery life in keyless entry transponders during idle periods |
| Auto-Standby Timeout Range | Adjustable from ~1µs to >1s via 1pF–100nF capacitor on STO pin - calibrated per tASB = 10 × CSTO µs |
| Input Common-Mode Range | –0.2V to (VCC – 1.2V) - allows ground-referenced sensing in single-supply sensor interfaces |
| Rail-to-Rail Output Swing | VOL ≤ 0.4V / VOH ≥ 0.7×VCC at 2mA - ensures clean logic-level compatibility with 3.3V/5V microcontrollers |
| Internal Hysteresis | 0.3–4mV input-referred - suppresses chatter on slow-moving analog thresholds (e.g., battery voltage monitoring) |
Pinout & Package
The MAX975ESA+ is housed in an 8-pin SO (Small Outline) package (package code S8-2), 3.9mm × 4.9mm body, 1.27mm pitch, with exposed pad not electrically connected. Thermal resistance θJA = 125°C/W; derating 5.88mW/°C above +70°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Positive supply input | Accepts +2.7V to +5.25V; requires local 0.1µF ceramic decoupling placed adjacent to pin |
| 2 IN+ | Noninverting comparator input | Rail-to-rail capable; common-mode range extends to –0.2V for ground-sensing applications |
| 3 IN– | Inverting comparator input | Same rail-to-rail and common-mode specs as IN+; differential input voltage unrestricted |
| 4 STAT | Mode status output | Open-drain compatible; sources 3mA when high (auto-standby/low-power); sinks 400µA when low (high-speed) |
| 5 STO | Standby timeout programming | Connect external capacitor (1pF–100nF) to GND; leakage <1nA required for accurate tASB calibration |
| 6 GND | Analog/digital ground reference | Single ground plane required; must tie to low-inductance PCB ground plane beneath device |
| 7 OUT | Comparator output | Rail-to-rail CMOS/TTL-compatible; maintains logic state and drive strength across all operating modes |
| 8 LP | Low-power mode control | Drive high for forced low-power mode; drive low for high-speed or auto-standby; bypass with 0.1µF if fall time >10µs |
Key Features
| Feature | Design Value |
|---|---|
| Three selectable operating modes | Hardware-configurable high-speed (28ns), auto-standby (dynamic transition), and low-power (3µA) modes via LP/STO pins |
| Adjustable auto-standby timeout | Programmed linearly with external capacitor (tASB = 10 × CSTO µs), enabling precise idle-time optimization in RF ID tags |
| Rail-to-rail I/O with fault tolerance | Inputs tolerate –0.2V to VCC + 0.3V; outputs withstand continuous short-circuit to either rail - eliminates need for external protection |
| STAT pin power-gating capability | 3mA sourcing current when high enables automatic wake-up of companion circuitry (e.g., MCU peripherals) during signal activity |
| Internal hysteresis in high-speed mode | 0.3–4mV input-referred hysteresis prevents oscillation on noisy or slowly varying inputs like IR photodiode outputs |
| Ground-sensing input architecture | Common-mode range includes –0.2V, allowing direct connection to 0V-referenced sensors without level-shifting resistors |
Applications
| IR Receiver Front-End | Threshold Detector for Battery Monitoring |
|---|---|
Use Scenario: Detecting modulated infrared pulses from remote controls in portable consumer devices. IC Role / Device Role / Timing Role: High-speed comparator with auto-standby acts as signal presence detector; STAT pin powers down downstream demodulator when no IR carrier is present. Use Value: Reduces average system current by >95% during idle periods while maintaining <28ns response to incoming bursts. |
Use Scenario: Monitoring lithium-ion cell voltage to trigger low-battery warnings before cutoff. IC Role / Device Role / Timing Role: Low-power comparator compares divided battery voltage against precision reference; operates continuously at 3µA in standby. Use Value: Enables monthly battery-life estimation in wearables without sacrificing detection accuracy or response latency. |
| RF ID Tag Signal Discriminator | Keyless Entry Receiver Threshold Comparator |
Use Scenario: Extracting digital data from weak, noise-prone RF carrier signals in passive RFID tags. IC Role / Device Role / Timing Role: Auto-standby mode activates only upon valid carrier detection; internal hysteresis rejects ambient EMI below 10mVpp. Use Value: Achieves reliable 100kbps data recovery with <5µA average quiescent current in intermittent-use access tokens. |
Use Scenario: Validating door-lock actuation signals received via low-frequency (125kHz) antenna in automotive key fobs. IC Role / Device Role / Timing Role: Dual-mode comparator switches from ultra-low-power listen mode (3µA) to high-speed decode mode (250µA) on field activation. Use Value: Extends fob battery life to >5 years while supporting sub-100ns edge detection for secure rolling-code validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV7215M5X | Single 65ns comparator, no auto-standby, 60µA supply current in active mode, no STAT pin | Suitable for always-on threshold detection but lacks dynamic power scaling for intermittent signal sources | Select when fixed-speed operation suffices and board space prohibits external timeout capacitor routing |
| TLV3604DBVR | Single 7ns comparator, no low-power/auto-standby modes, 1.2mA supply current, rail-to-rail I/O | Optimized for high-speed window comparators or clock/data recovery, not battery-constrained systems | Select when propagation delay <10ns is mandatory and average current budget exceeds 100µA |
Compared with LMV7215M5X and TLV3604DBVR, the MAX975ESA+ uniquely delivers programmable auto-standby with sub-µA idle current and hardware-selectable speed/power trade-offs - making it the only choice for energy-harvested or coin-cell-powered signal discriminators requiring both responsiveness and longevity.
Availability
MAX975ESA+ is available at Aetrix Electronics and suitable for battery-powered systems, IR receivers, and keyless entry modules requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for MAX975ESA+ 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 MAX975ESA+ belongs to Maxim's ultra-low-power comparator product line, engineered specifically for intermittent-signal detection in energy-constrained wireless and portable systems where adaptive speed/power control is essential.
FAQ
What is the maximum timeout period achievable with the MAX975ESA+ auto-standby feature?
The MAX975ESA+ auto-standby timeout is set by an external capacitor on the STO pin using tASB = 10 × CSTO µs. With a 100nF capacitor, the timeout reaches 1 second. Larger values are limited by capacitor leakage (<1nA required); ceramic capacitors up to 1µF are recommended. The MAX975ESA+ does not support timeouts beyond ~1.5 seconds due to practical leakage constraints.
Can the MAX975ESA+ operate reliably from a 2.7V supply in high-speed mode?
Yes, the MAX975ESA+ is fully specified from +2.7V to +5.25V. At VCC = 2.7V, high-speed propagation delay remains ≤50ns (vs. 28ns typical at 5V), supply current is 250µA max, and rail-to-rail output swing meets VOL ≤ 0.4V and VOH ≥ 1.89V at 2mA load - sufficient for interfacing with 2.7V logic families. The MAX975ESA+ maintains full functionality across its entire supply range.
How does the STAT pin behave during transitions between operating modes?
The STAT pin goes high during auto-standby entry, low-power mode, and the transition from auto-standby back to high-speed mode. It goes low only when the high-speed comparator is fully active and stable. During wake-up, STAT remains high until the high-speed path is ready, providing a clean enable signal for synchronizing external circuitry. This behavior is guaranteed in the MAX975ESA+ datasheet timing diagrams.
Is the MAX975ESA+ pinout compatible with other 8-pin SO comparators like the MAX9060?
No, the MAX975ESA+ has a unique pinout optimized for its auto-standby architecture: STO (pin 5), STAT (pin 4), and LP (pin 8) have no equivalents in standard comparators. Pin-for-pin replacement is not possible. Substitution requires PCB layout revision and firmware updates to manage mode control. The MAX975ESA+ pin configuration is documented in Maxim's datasheet Figure 1 and Pin Descriptions section.
What is the minimum input overdrive required for guaranteed 28ns propagation delay in high-speed mode?
The MAX975ESA+ guarantees 28ns propagation delay in high-speed mode with ≥5mV input overdrive (differential voltage beyond trip point) at VCC = 5V and CLOAD = 10pF. At lower overdrives, delay increases predictably: tPD ≈ 28ns + (VOS / overdrive) × 28ns. For robust design, maintain ≥10mV overdrive; the MAX975ESA+'s ±3mV max VOS ensures margin even at 5mV overdrive.
MAX975ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- 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
- :
- 8-SOIC
MAX975ESA+ FAQ
1.How can I place an order for MAX975ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX975ESA+ 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 MAX975ESA+ reliable?
The price and inventory of MAX975ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX975ESA+ is usually 5 days.
3.What payment methods are accepted for MAX975ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX975ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX975ESA+?
MAX975ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX975ESA+ 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 MAX975ESA+?
For technical support, including MAX975ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX975ESA+ requirements.
6.How does Aetrix verify that MAX975ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX975ESA+ 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 MAX975ESA+ meets industry standards.
7.What is the process for return or replacement of MAX975ESA+?
All MAX975ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX975ESA+, 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 MAX975ESA+ part is unused and in its original packaging.
Return procedure for MAX975ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX975ESA+ Tags
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LM339DR
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LM339PWR
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LM393DT
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LM2903DT
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LM393DR
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LM239DR
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