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Product Detailed Parameters
- Description：IC COMPARATOR 4 GEN PUR 16SO
- Series：UltraFast™
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- 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-SOIC (0.154", 3.90mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：16-SO
- Grade：-
- Qualification：-
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Overview
The LT1721IS#TRPBF is a quad UltraFast comparator optimized for single supply operation with a voltage range of 2.7V to 6V. It features rail-to-rail outputs compatible with TTL and CMOS logic. The device includes internal hysteresis and offers propagation delays of 4.5ns at 20mV overdrive. It operates within an industrial temperature range of -40°C to 85°C and is housed in a 16-lead plastic SO package.
Feature Summary
- UltraFast switching speed with 4.5ns propagation delay at 20mV overdrive
- Rail-to-rail outputs directly interface with TTL and CMOS logic levels
- Internal hysteresis ensures stable operation with slow-moving input signals
- Input common mode range extends 100mV below the negative supply rail
Applications
- Crystal oscillator circuits
- High-speed differential line receivers
- Window comparators and threshold detectors
- Zero-crossing detectors
- High-speed sampling circuits
Procurement Notes
Verify the specific IS suffix indicates the industrial temperature grade (-40°C to 85°C) and the TRPBF suffix denotes tape and reel packaging. Confirm the 16-lead SO package matches the target PCB footprint. Ensure the component meets RoHS3 compliance requirements for the intended assembly process.
Selection Notes
Select this component when high-speed signal discrimination is required in low-voltage single-supply systems. The quad configuration allows multiple comparisons in a compact space. Consider the internal hysteresis for noise immunity, though external feedback may be needed for larger thresholds. Verify that the output drive capability meets the load requirements of the downstream logic family.
Part Context
This part 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 compatibility for inputs and outputs, differing primarily in channel count and package options.
Replacement Considerations
LT1721CS#TRPBF (Commercial grade, same package)
FAQ
How does the internal hysteresis affect the trip points?
The internal hysteresis creates two distinct trip points: one for rising inputs and one for falling inputs. This prevents output oscillation when the input signal is near the threshold, ensuring clean transitions even with noisy or slowly changing 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 without affecting output validity.
