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Product Detailed Parameters
- Description：IC COMPARATOR 4 GEN PUR 16SO
- Series：UltraFast™
- Mfr：Analog Devices Inc.
- Package：Tube
- Type：General Purpose
- Number of Elements：4
- Output Type：CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±)：2.7V ~ 6V
- Voltage - Input Offset (Max)：3mV @ 5V
- Current - Input Bias (Max)：6µA @ 5V
- Current - Output (Typ)：20mA
- Current - Quiescent (Max)：7mA
- CMRR, PSRR (Typ)：70dB CMRR, 80dB PSRR
- Propagation Delay (Max)：10ns
- Hysteresis：7mV
- Operating Temperature：0°C ~ 70°C
- Package / Case：16-SOIC (0.154", 3.90mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：16-SO
- Grade：-
- Qualification：-
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Overview
The LT1721CS#PBF is a quad ultrafast comparator optimized for single-supply operation within a 2.7V to 6V range. It features rail-to-rail outputs compatible with TTL and CMOS logic levels. The device provides a propagation delay of 4.5ns at 20mV overdrive and 7ns at 5mV overdrive, with a supply current of 4mA per comparator at 5V. It includes internal hysteresis and operates in the commercial temperature range of 0°C to 70°C.
Feature Summary
- Quad configuration with rail-to-rail outputs directly interfacing to TTL and CMOS logic.
- Ultrafast response time with specified propagation delays of 4.5ns and 7ns under varying overdrive conditions.
- Internal hysteresis ensures stable operation with slow-moving input signals.
- Input voltage range extends from 100mV below ground to 1.2V below the positive supply rail.
Applications
- Crystal oscillator circuits
- Window comparators
- Threshold detectors and discriminators
- High-speed sampling circuits
Procurement Notes
Verify the specific package type and lead-free finish when ordering. Confirm that the component meets RoHS3 compliance standards. Ensure the operating temperature range aligns with the C grade specification. Check for any specific marking requirements on the shipping container regarding temperature grades.
Selection Notes
Select this component for applications requiring high speed and low power consumption in single-supply systems. The quad architecture reduces board space compared to dual packages. Consider the internal hysteresis for noise immunity without external components. Verify output drive capabilities against load requirements.
Part Context
This part belongs to the LT1720/LT1721 family of ultrafast comparators manufactured by Analog Devices Inc. The LT1721 variant specifically offers four independent comparators in a single package, contrasting with the dual-channel LT1720. Both share identical electrical characteristics and pinout optimizations for high-speed performance.
Replacement Considerations
LT1721IS#PBF (Industrial Temperature Grade)
FAQ
How does the internal hysteresis affect the input trip points?
The internal hysteresis creates two distinct input trip points, VTRIP+ and VTRIP-, which define the voltage thresholds required to switch the output state. This prevents oscillation caused by noise on slow-moving input signals.
What is the common mode input voltage range?
The common mode input voltage range extends from 100mV below ground to 1.2V below the positive supply voltage (VCC). If one input is within this limit, the other can exceed it slightly while maintaining valid output polarity.
