LT1720/LT1721 Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs FEATURESDESCRIPTION n UltraFast: 4.5ns at 20mV Overdrive The LT®1720/LT1721 are UltraFastTM dual/quad compara- 7ns at 5mV Overdrive tors optimized for single supply operation, with a supply n Low Power: 4mA per Comparator voltage range of 2.7V to 6V. The input voltage range extends n Optimized for 3V and 5V Operation from 100mV below ground to 1.2V below the supply volt- n Pinout Optimized for High Speed Ease of Use age. Internal hysteresis makes the LT1720/LT1721 easy to n Input Voltage Range Extends 100mV use even with slow moving input signals. The rail-to-rail Below Negative Rail outputs directly interface to TTL and CMOS. Alternatively, n TTL/CMOS Compatible Rail-to-Rail Outputs the symmetric output drive can be harnessed for analog n Internal Hysteresis with Specifi ed Limits applications or for easy translation to other single supply n Low Dynamic Current Drain; 15μA/(V-MHz), logic levels. Dominated by Load In Most Circuits The LT1720 is available in three 8-pin packages; three pins n Tiny 3mm × 3mm × 0.75mm DFN Package (LT1720) per comparator plus power and ground. In addition to SO and MSOP packages, a 3mm × 3mm low profi le (0.8mm) APPLICATIONS dual fi ne pitch leadless package (DFN) is available for space n High Speed Differential Line Receiver limited applications. The LT1721 is available in the 16-pin n Crystal Oscillator Circuits SSOP and S packages. n Window Comparators The pinouts of the LT1720/LT1721 minimize parasitic n Threshold Detectors/Discriminators effects by placing the most sensitive inputs (inverting) n Pulse Stretchers away from the outputs, shielded by the power rails. The n Zero-Crossing Detectors LT1720/LT1721 are ideal for systems where small size and n High Speed Sampling Circuits low power are paramount. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. UltaFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIONPropagation Delay vs Overdrive2.7V to 6V Crystal Oscillator with TTL/CMOS Output 8 2.7V TO 6V 25°C 1MHz TO 10MHz 7 VSTEP = 100mV 2k CRYSTAL (AT-CUT) VCC = 5V RISING EDGE 220Ω 6 CLOAD = 10pF (tPDLH) 5 620Ω GROUND 4 + CASE FALLING EDGE DELAY (ns) (t C1 3 PDHL) 1/2 LT1720 OUTPUT 2 – 1 2k 17201 TA01 0 0.1μF 1.8k 0 10 20 30 40 50 OVERDRIVE (mV) 17201 TA02 17201fc 1
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