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Analog Devices Inc./Maxim Integrated MAX9109ESA+T
- Part No.:
- MAX9109ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX9109ESA+T.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
The MAX9109ESA+T from Maxim Integrated is a single, high-speed, low-power TTL-compatible voltage comparator with internal latch and 25ns propagation delay at 10mV overdrive, operating from a +4.5V to +5.5V supply. It features 500µV typical input offset voltage, 2mV internal hysteresis, and wide input common-mode range (–0.2V to VCC – 1.5V), enabling robust threshold detection in battery-powered sensor interfaces.
For engineers reviewing the MAX9109ESA+T datasheet, MAX9109ESA+T pinout, MAX9109ESA+T application, or MAX9109ESA+T equivalent, this device is selected for precision zero-crossing detection, A/D converter front-end sampling control, and infrared data link receivers where latch-enabled decision capture and sub-30ns timing response are required.
Technical Context
The MAX9109ESA+T implements a bipolar comparator core with integrated latch logic controlled by the LE pin: when LE is low, the output follows comparator state transparently; when LE goes high, the current comparison result is latched and held. Its 2mV hysteresis eliminates oscillation near trip points without external feedback components.
Input stage design supports rail-to-rail common-mode operation down to –0.2V (200mV below ground) and up to VCC – 1.5V, while TTL-compatible outputs drive 3.2mA sink/100µA source loads directly-no pull-up resistors needed. Propagation delay skew is limited to 5ns between rising and falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 25ns at 10mV input overdrive - enables precise timing in 40MHz sampling windows |
| Supply Current per Comparator | 350µA at VCC = +5.5V - supports ultra-low-power battery operation (e.g., <1mA total system current) |
| Input Offset Voltage | 0.5mV (min), 1.6mV (typ) - ensures accurate threshold setting within ±1mV error budget |
| Input Common-Mode Range | –0.2V to VCC – 1.5V - allows direct interfacing to ground-referenced sensors and rail-split signals |
| Hysteresis Width | 2mV - suppresses noise-induced chatter on slow-moving inputs without external components |
| Latch Enable Threshold | VIL = 0.8V, VIH = 2.0V - compatible with standard TTL logic levels for synchronous capture |
| Output Drive Capability | VOL = 0.35V @ 3.2mA sink - guarantees clean low-state logic interface to downstream TTL or CMOS inputs |
Pinout & Package
MAX9109ESA+T is housed in an 8-pin SO (Small Outline) package (package code S8-2), measuring 4.9mm × 6.0mm × 1.75mm, with gull-wing leads and RoHS-compliant finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection - must be left unconnected or tied to GND for mechanical stability |
| 2 | OUT | TTL-compatible active-high output - drives downstream logic directly without pull-up |
| 3 | GND | Analog/digital ground reference - requires low-inductance connection to PCB ground plane |
| 4 | LE | Latch enable input - high level captures and holds comparator output state; low level enables transparency |
| 5 | VCC | Positive supply pin - requires local 0.1µF ceramic decoupling capacitor placed adjacent to pin |
| 6 | IN+ | Noninverting input - accepts signals within full common-mode range; high-impedance (350nA bias) |
| 7 | IN− | Inverting input - differential pair input referenced to IN+; matched with IN+ for offset minimization |
| 8 | N.C. | No internal connection - must be left unconnected or tied to GND for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2mV hysteresis | Eliminates need for external positive feedback resistors while preventing oscillation during slow input transitions |
| Latch function (LE-controlled) | Enables synchronous sampling of analog events in digital systems - critical for time-stamped edge detection |
| TTL-compatible outputs | Direct interface to legacy logic families without level-shifting or pull-up networks - reduces BOM count and layout area |
| Wide input common-mode range | Supports direct connection to ground-referenced transducers and single-supply op-amp outputs without level shifting |
| Low 350µA supply current | Extends battery life in portable IR receivers and sensor nodes - contributes <0.8mW per comparator at 5V |
Applications
| Battery-Powered Infrared Data Link | A/D Converter Sampling Control |
|---|---|
Use Scenario: Low-power IR receiver detecting modulated 38kHz carrier pulses from remote controls in handheld devices. IC Role / Device Role / Timing Role: MAX9109ESA+T compares photodiode amplifier output against fixed threshold and latches valid pulse detection on LE edge. Use Value: Total circuit current <760µA enables >1-year coin-cell operation; 25ns delay ensures accurate pulse-width discrimination at 38kHz. |
Use Scenario: Precision timing control of sample-and-hold initiation in a 12-bit SAR ADC front-end. IC Role / Device Role / Timing Role: MAX9109ESA+T detects analog input crossing a programmable reference and triggers conversion start via latched output. Use Value: 500µV offset and 2mV hysteresis limit aperture uncertainty to <1LSB at 12-bit resolution; latch synchronizes trigger to system clock. |
| Zero-Crossing Detector for AC Line Monitoring | Threshold Discriminator in Sensor Interface |
Use Scenario: Isolated AC mains monitoring in smart energy meters to detect voltage polarity transitions. IC Role / Device Role / Timing Role: MAX9109ESA+T compares scaled AC waveform against 0V reference and latches zero-cross event for microcontroller timestamping. Use Value: –0.2V to VCC–1.5V input range accepts transformer-coupled signal directly; 25ns delay enables <0.1° phase error at 50Hz. |
Use Scenario: Industrial temperature sensor output conditioning where over-temperature alarm must activate above 100°C. IC Role / Device Role / Timing Role: MAX9109ESA+T compares conditioned RTD or thermistor voltage against precision reference and asserts latched alarm flag. Use Value: 0.5mV offset ensures alarm threshold accuracy within ±0.5°C; internal hysteresis prevents chatter near trip point in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Slower (200ns propagation delay), no internal hysteresis or latch, open-collector output requiring pull-up | Suitable for general-purpose comparator use but lacks timing precision and latch functionality required for sampled-data systems | Select only if cost sensitivity outweighs speed, power, and integration requirements |
| TLV3501CDR | Faster (4.5ns delay), rail-to-rail input, no latch, CMOS output (not TTL-compatible), higher supply current (5.3mA) | Better for high-speed analog-to-digital triggering but incompatible with legacy TTL loads and adds complexity in latch-required designs | Prefer when nanosecond timing dominates; avoid when TTL interface or latch hold is mandatory |
Compared with LM311DR and TLV3501CDR, the MAX9109ESA+T uniquely combines TTL compatibility, internal latch, 25ns speed, and sub-milliwatt power in a single SO package - making it optimal for battery-operated, latch-synchronized, and legacy-system interfacing applications.
Availability
MAX9109ESA+T is available at Aetrix Electronics and suitable for battery-powered infrared receivers, A/D converter sampling control circuits, and zero-crossing detectors requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX9109ESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX9109ESA+T belongs to Maxim's precision high-speed comparator family, designed specifically for low-power, latch-enabled threshold detection in portable and timing-critical systems where TTL compatibility and minimal external components are essential.
FAQ
What is the function of the LE pin on the MAX9109ESA+T?
The LE (Latch Enable) pin on the MAX9109ESA+T controls the internal latch: when LE is low, the output follows the comparator decision in real time (transparent mode); when LE transitions high, the current output state is captured and held regardless of subsequent input changes. This allows precise synchronization of analog event detection to a digital clock edge - a key capability not present in standard comparators like the LM311DR. The MAX9109ESA+T requires LE to be driven with TTL-compatible logic levels (VIL ≤ 0.8V, VIH ≥ 2.0V).
Does the MAX9109ESA+T require external pull-up resistors on its output?
No, the MAX9109ESA+T does not require external pull-up resistors because its output is fully TTL-compatible, capable of sourcing 100µA and sinking 3.2mA while maintaining VOH ≥ 3.0V and VOL ≤ 0.6V. This eliminates board space and BOM cost associated with pull-up networks - a distinct advantage over open-collector comparators such as the LM311DR. The MAX9109ESA+T output drives standard TTL and 5V CMOS inputs directly, simplifying interface design in legacy and mixed-voltage systems.
What is the input common-mode voltage range specification for the MAX9109ESA+T?
The MAX9109ESA+T supports an input common-mode voltage range from –0.2V to VCC – 1.5V, meaning it accepts signals 200mV below ground and up to 1.5V below the positive supply - verified across the full –40°C to +85°C operating temperature range. This enables direct interfacing with ground-referenced sensors, single-supply op-amp outputs, and transformer-coupled AC signals without level-shifting circuitry. Unlike many comparators that clamp inputs at GND or VCC, the MAX9109ESA+T maintains functionality even with negative-going transients, a critical feature in zero-crossing and battery-monitoring applications.
How does the internal hysteresis of the MAX9109ESA+T improve noise immunity?
The MAX9109ESA+T incorporates a fixed 2mV internal hysteresis zone, which creates two distinct input trip points (VTRIP+ and VTRIP−) separated by 2mV - eliminating oscillation when inputs dwell near the decision threshold. This prevents false triggering caused by noise or slow-moving signals, removing the need for external hysteresis resistors used in standard comparators. For example, in an infrared data link, this ensures clean pulse detection even with photodiode signal ripple; the MAX9109ESA+T achieves this with zero external components while maintaining 25ns propagation delay.
Is the MAX9109ESA+T pin-compatible with other devices in the MAX9107/MAX9108/MAX9109 family?
No, the MAX9109ESA+T is not pin-compatible with the dual MAX9107 or quad MAX9108 - it uses an 8-pin SO package with dedicated LE, OUT, IN+, IN−, VCC, and GND pins plus two N.C. pins, whereas MAX9107 uses 8-pin SOT23/SO with dual-channel routing and MAX9108 uses 14-pin TSSOP/SO for four channels. Pinouts differ fundamentally due to channel count and latch inclusion. Substitution requires PCB redesign; however, functional equivalents exist (e.g., TLV3501CDR for speed, LM311DR for cost), though none replicate the exact combination of latch, TTL output, and 25ns delay found in the MAX9109ESA+T.
MAX9109ESA+T 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:
- Active
- Type:
- with Latch
- Number of Elements:
- 1
- Output Type:
- TTL
- Voltage - Supply, Single/Dual (±):
- 4.5V ~ 5.5V
- :
- 1.6mV @ 5V
- Voltage - Input Offset (Max):
- 0.125µA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 700µA
- Current - Quiescent (Max):
- 86.02dB CMRR, 86.02dB PSRR
- CMRR, PSRR (Typ):
- 25ns
- Propagation Delay (Max):
- 2mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX9109ESA+T FAQ
1.How can I place an order for MAX9109ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9109ESA+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 MAX9109ESA+T reliable?
The price and inventory of MAX9109ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9109ESA+T is usually 5 days.
3.What payment methods are accepted for MAX9109ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9109ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9109ESA+T?
MAX9109ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9109ESA+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 MAX9109ESA+T?
For technical support, including MAX9109ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9109ESA+T requirements.
6.How does Aetrix verify that MAX9109ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX9109ESA+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 MAX9109ESA+T meets industry standards.
7.What is the process for return or replacement of MAX9109ESA+T?
All MAX9109ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9109ESA+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 MAX9109ESA+T part is unused and in its original packaging.
Return procedure for MAX9109ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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