LT1720/LT1721

1

17201fc

TYPICAL APPLICATION

DESCRIPTION

Dual/Quad, 4.5ns, Single

Supply 3V/5V Comparators

with Rail-to-Rail Outputs

The LT

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 volt-

age. 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 symmetric output drive can be harnessed for analog

applications or for easy translation to other single supply

logic levels.

The LT1720 is available in three 8-pin packages; three pins

per comparator plus power and ground. In addition to SO

and MSOP packages, a 3mm

× 3mm low profile (0.8mm)

dual fine pitch leadless package (DFN) is available for space

limited applications. 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.

2.7V to 6V Crystal Oscillator with TTL/CMOS Output

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.

FEATURES

APPLICATIONS

7ns at 5mV Overdrive

Below Negative Rail

Dominated by Load In Most Circuits

× 3mm × 0.75mm DFN Package (LT1720)

Propagation Delay vs Overdrive

–

+

C1

1/2 LT1720

2.7V TO 6V

2k

620Ω

220Ω

1MHz TO 10MHz

CRYSTAL (AT-CUT)

2k

17201 TA01

0.1μF

1.8k

OUTPUT

GROUND

CASE

OVERDRIVE (mV)

0

30

50

17201 TA02

10

20

40

8

7

6

5

4

3

2

1

0

25°C

RISING EDGE

FALLING EDGE