LT1720CS8
Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs

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Datasheet

Size: 317.32KB
Page: 28
PDF: LT1720CS8.pdf
  • Description:
    Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs
  • MFG:
    LINER [Linear Technology]
 

Abstract


1
LT1720/LT1721
Dual/Quad,
4.5ns, Single Supply
3V/5V Comparators
with Rail-to-Rail Outputs
n
UltraFast: 4.5ns at 20mV Overdrive
7ns at 5mV Overdrive
n
Low Power: 4mA per Comparator
n
Optimized for 3V and 5V Operation
n
Pinout Optimized for High Speed Ease of Use
n
Input Voltage Range Extends 100mV
Below Negative Rail
n
TTL/CMOS Compatible Rail-to-Rail Outputs
n
Internal Hysteresis with Specified Limits
n
Low Dynamic Current Drain; 15m A/(V-MHz),
Dominated by Load In Most Circuits
The LT
?
1720/LT1721 are UltraFast
TM
dual/quad compara-
tors optimized for single supply operation, with a supply
voltage range of 2.7V to 6V. The input voltage range extends
from 100mV below ground to 1.2V below the supply voltage.
Internal hysteresis makes the LT1720/LT1721 easy to use
even with slow moving input signals. The rail-to-rail outputs
directly interface to TTL and CMOS. Alternatively, the sym-
metric output drive can be harnessed for analog applications
or for easy translation to other single supply logic levels.
The LT1720 is available in the 8-pin MSOP and SO packages;
three pins per comparator plus power and ground. The
LT1721 is available in the 16-pin SSOP and S packages.
The pinouts of the LT1720/LT1721 minimize parasitic effects
by placing the most sensitive inputs (inverting) away from the
outputs, shielded by the power rails. The LT1720/LT1721 are
ideal for systems where small size and low power are
paramount.
, LTC and LT are registered trademarks of Linear Technology Corporation.
UltraFast is a trademark of Linear Technology Corporation.
n
High Speed Differential Line Receiver
n
Crystal Oscillator Circuits
n
Window Comparators
n
Threshold Detectors/Discriminators
n
Pulse Stretchers
n
Zero-Crossing Detectors
n
High Speed Sampling Circuits
2.7V to 6V Crystal Oscillator with TTL/CMOS Output

+
C1
1/2 LT1720
2.7V TO 6V
2k
620?
220?
1MHz TO 10MHz
CRYSTAL (AT-CUT)
2k
1720/21 TA01
0.01?F 1.8k
OUTPUT
GROUND
CASE
Propagation Delay vs Overdrive
OVERDRIVE (mV)
0
DELAY (ns)
30 50
1720/21 TA02
10 20 40
8
7
6
5
4
3
2
1
0
25°C
V
STEP
= 100mV
V
CC
= 5V
C
LOAD
= 10pF
RISING EDGE
(t
PDLH
)
FALLING EDGE
(t
PDHL
)
FEATURES DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U

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