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