LT1719
4.5ns Single/Dual Supply
3V/5V Comparator with
Rail-to-Rail Output
FEATURES
s
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DESCRIPTIO
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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
Output Optimized for 3V and 5V Supplies
Input Voltage Range Extends 100mV
Below Negative Rail
TTL/CMOS Compatible Rail-to-Rail Output
Low Power Shutdown Mode: 0.1碌A(chǔ)
APPLICATIO S
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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
廬
1719 is an UltraFast
TM
comparator optimized for low
voltage operation. Separate supplies allow flexible operation
to accomodate separate analog input ranges and output logic
levels. The input voltage range extends from 100mV below
V
EE
to 1.2V below V
CC
. 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.
The LT1719 is available in the 8-pin SO package; a shutdown
control allows for reduced power consumption and extended
battery life in portable applications.
For a dual/quad comparator with similar performance, see
the LT1720/LT1721.
, LTC and LT are registered trademarks of Linear Technology Corporation.
UltraFast is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
2.7V to 6V Crystal Oscillator with TTL/CMOS Output
2.7V TO 6V
2k
220鈩?/div>
1MHz TO 10MHz
CRYSTAL (AT-CUT)
8
7
6
GROUND
CASE
OUTPUT
RISING EDGE
(t
PDLH
)
25擄C
V
STEP
= 100mV
V
CC
= 5V
C
LOAD
= 10pF
Propagation Delay vs Overdrive
DELAY (ns)
620鈩?/div>
5
4
3
2
FALLING EDGE
(t
PDHL
)
+
鈥?/div>
C1
LT1719
2k
1719 TA01
1
0
0
10
30
OVERDRIVE (mV)
20
40
50
1719 TA02
0.01碌F
1.8k
U
U
U
1
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