Datasheet LT1719 (Analog Devices)

LT1719 4.5ns Single/Dual Supply 3V/5V Comparator with Rail-to-Rail Output
FEATURES DESCRIPTION
n
UltraFast: 4.5ns at 20mV Overdrive
The LT®1719 is an UltraFast™ comparator optimized for low
7ns at 5mV Overdrive
voltage operation. The input voltage range extends from n
Low Power: 4.2mA at 3V
100mV below VEE to 1.2V below VCC. Internal hysteresis n Separate Input and Output Power Supplies makes the LT1719 easy to use even with slow moving input (SO-8 Only) signals. The rail-to-rail outputs directly interface to TTL n Output Optimized for 3V and 5V Supplies and CMOS. Alternatively the symmetric output drive can be n TTL/CMOS Compatible Rail-to-Rail Output harnessed for analog applications or for easy translation to n Low Power Shutdown Mode: 0.1μA other single supply logic levels. A shutdown control allows n Low Profi le (1mm) SOT-23 (ThinSOT™) Package for reduced power consumption and extended battery life in portable applications.
APPLICATIONS
The LT1719 is available in the SO-8 and 6-lead SOT-23 package. The SO-8 package has separate supplies which n High Speed Differential Line Receiver allow fl exible operation, accomodating separate analog n Crystal Oscillator Circuits input ranges and output logic levels. n Level Translators For a dual/quad comparator with similar performance, see n Threshold Detectors/Discriminators the LT1720/LT1721. n Zero-Crossing Detectors L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n High Speed Sampling Circuits Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Delay Lines
TYPICAL APPLICATION 2.7V to 6V Crystal Oscillator with TTL/CMOS Output Propagation Delay vs Overdrive
2.7V TO 6V 8 25°C 1MHz TO 10MHz 7 V 2k CRYSTAL (AT-CUT) STEP = 100mV 220Ω V+= 5V RISING EDGE 6 CLOAD = 10pF (tPDLH) 620Ω 5 GROUND CASE 4 + FALLING EDGE C1 DELAY (ns) OUTPUT 3 (tPDHL) LT1719 – 2 2k 1719 TA01 1 0.1μF 1.8k 0 0 10 20 30 40 50 OVERDRIVE (mV) 1719 TA02 1719fa 1