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Product Detailed Parameters
- Description：IC COMPARATOR 4 GEN PUR 16SSOP
- 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：-40°C ~ 85°C
- Package / Case：16-SSOP (0.154", 3.90mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：16-SSOP
- Grade：-
- Qualification：-
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Overview
The LT1721IGN 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. The device offers a propagation delay of 4.5ns at 20mV overdrive and 7ns at 5mV overdrive. Quiescent current consumption is 4mA per comparator. Input voltage range extends from 100mV below ground to 1.2V below the positive supply rail. Internal hysteresis ensures stable operation with slow-moving signals.
Feature Summary
- Ultrafast response time with 4.5ns propagation delay at 20mV overdrive
- Rail-to-rail outputs directly interface to TTL and CMOS logic levels
- Input voltage range extends 100mV below the negative supply rail
- Internal hysteresis prevents oscillation with slow-moving input signals
Applications
- Crystal oscillator circuits
- High-speed differential line receivers
- Window comparators
- Threshold detectors and discriminators
- Zero-crossing detectors
Procurement Notes
Verify the specific suffix IGN indicates the industrial temperature grade (-40°C to 85°C) and 16-lead narrow plastic SSOP package. Confirm lead-free finish status via manufacturer documentation. Ensure ordering codes match the required tape and reel or tube packaging format for production integration.
Selection Notes
Select this component when high speed and low power are critical in single-supply systems. The quad configuration allows multiple comparisons in a compact footprint. Consider the internal hysteresis for noise immunity without external components. Verify that the input common-mode range and output drive capabilities meet the specific circuit requirements.
Part Context
The LT1721 belongs to the LT1720/LT1721 family of ultrafast comparators. While the LT1720 provides dual channels, the LT1721 integrates four independent comparators. Both share identical electrical characteristics and pinout optimizations designed to minimize parasitic effects by shielding sensitive inputs between power rails.
Replacement Considerations
LT1721CGN#PBF: Same quad comparator but commercial temperature grade (0°C to 70°C).
FAQ
How does the input voltage range behave relative to the supply rails?
The common mode input voltage range extends from 100mV below ground to 1.2V below the positive supply voltage.
What is the purpose of the internal hysteresis?
Internal hysteresis makes the comparator easy to use with slow-moving input signals by preventing output oscillation due to noise.
