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Product Detailed Parameters
- Description：IC COMPARATOR 1 W/LATCH 8SOIC
- Series：-
- Mfr：Analog Devices Inc./Maxim Integrated
- Package：Tube
- Type：with Latch
- Number of Elements：1
- Output Type：TTL
- Voltage - Supply, Single/Dual (±)：4.5V ~ 5.5V
- Voltage - Input Offset (Max)：1.6mV @ 5V
- Current - Input Bias (Max)：0.125µA @ 5V
- Current - Output (Typ)：-
- Current - Quiescent (Max)：700µA
- CMRR, PSRR (Typ)：86.02dB CMRR, 86.02dB PSRR
- Propagation Delay (Max)：25ns
- Hysteresis：2mV
- Operating Temperature：-40°C ~ 85°C
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The MAX9109ESA+ is a single-channel, high-speed voltage comparator designed for +5V systems. It features a 25ns propagation delay with 350µA supply current per channel. The device operates on a single 4.5V to 5.5V supply and includes internal hysteresis for clean switching. Its wide input common-mode range extends from 200mV below ground to within 1.5V of the positive rail. Outputs are TTL-compatible without external pullups. The MAX9109 variant specifically incorporates an internal latch controlled by a Latch Enable (LE) pin.
Feature Summary
- Internal hysteresis eliminates external resistors and ensures clean output switching.
- TTL-compatible outputs require no external pullup circuitry.
- Wide input common-mode range includes ground potential.
- Integrated latch stores comparison results when enabled.
Applications
- Battery-powered infrared data links
- Threshold detectors and discriminators
- Zero-crossing detectors
Procurement Notes
Verify the specific package code S8-2 corresponds to the 8-pin SOIC format required for your PCB footprint. Confirm that the design utilizes a single +5V supply within the 4.5V to 5.5V operating range. Ensure the Latch Enable pin is properly biased if the internal latch functionality is not intended for use in the final application.
Selection Notes
Select this component when low power consumption is critical alongside high-speed response times. The integrated latch distinguishes it from the MAX9107 and MAX9108, making it suitable for applications requiring state storage. Verify that the 8-pin SO package fits the available board space compared to the smaller SC70 or SOT23 options.
Part Context
This part belongs to the MAX9107/MAX9108/MAX9109 family of comparators. While the MAX9107 offers dual channels and the MAX9108 provides four, the MAX9109 is configured as a single channel. All variants share identical electrical characteristics regarding speed and power consumption but differ in channel count and package availability.
Replacement Considerations
The datasheet identifies the MAX909 as the industry-standard comparator that the MAX9109 upgrades. Designers replacing older MAX909 designs should verify that the new internal hysteresis and latch enable requirements align with the existing circuit topology.
FAQ
How does the internal hysteresis function?
The device incorporates 2mV of internal hysteresis to prevent oscillation in the linear region caused by noise or parasitic feedback, eliminating the need for external resistors.
What is the function of the LE pin?
The Latch Enable (LE) pin controls the internal latch. When LE is low, the comparator operates transparently; when LE is high, the output state is latched.
