1

LT1394

7ns, Low Power,

Single Supply, Ground-Sensing

Comparator

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High Speed A/D Converters

s

Zero-Crossing Detectors

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Current Sense for Switching Regulators

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Extended Range V/F Coverters

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Fast Pulse Height/Width Discriminators

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High Speed Triggers

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Line Receivers

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High Speed Sampling Circuits

Propagation Delay vs

Input Overdrive

OVERDRIVE (mV)

0

12

10

8

6

4

2

0

10

20

30

40

1394 TA02

50

, LTC and LT are registered trademarks of Linear Technology Corporation.

UltraFast is a trademark of Linear Technology Corporation.

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UltraFast

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Low Power: 6mA

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Low Offset Voltage: 0.8mV

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Operates Off Single 5V or Dual

±5V Supplies

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Input Common Mode Extends to Negative Supply

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No Minimum Input Slew Rate Requirement

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Complementary TTL Outputs

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Inputs Can Exceed Supplies without Phase Reversal

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Pin Compatible with LT1016, LT1116 and LT1671

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Output Latch Capability

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Available in 8-Lead MSOP and SO Packages

The LT

mentary outputs and latch. The input common mode range

extends from 1.5V below the positive supply down to the

negative supply rail. Like the LT1016, LT1116 and LT1671,

this comparator has complementary outputs designed to

interface directly to TTL or CMOS logic. The LT1394 may

operate from either a single 5V supply or dual

±5V supplies.

Low offset voltage specifications and high gain allow the

LT1394 to be used in precision applications.

The LT1394 is designed for improved speed and stability for

a wide range of operating conditions. The output stage

provides active drive in both directions for maximum speed

intoTTL,CMOSorpassiveloadswithminimalcross-conduc-

tion current. Unlike other fast comparators, the LT1394

remains stable even for slow transitions through the active

region, which eliminates the need to specify a minimum input

slew rate.

The LT1394 has an internal, TTL/CMOS compatible latch for

retaining data at the outputs. The latch holds data as long as

the LATCH pin is held high. Device parameters such as gain,

offset and negative power supply current are not significantly

affected by variations in negative supply voltage.

45MHz Single Supply Adaptive Trigger

5V

–

+

A1

LT1227

A2

LT1006

INPUT

5V

5V

5V

TRIGGER

OUT

1394 F18

500pF

0.1

µF

510

Ω

470

Ω

470

Ω

750

Ω

36

Ω

1

3

2

4

14

13

15

5

6

12

10

11

2k

10

µF

2k

2k

0.1

µF

0.1

µF

0.005

µF

0.005

µF

100

µF

+

Q1, Q2, Q3, Q4 = CA3096 ARRAY:

TIE SUBSTRATE (PIN 16) TO GROUND

= 1N4148

LT1394

Q1

Q2

Q3

Q4

3M

3M

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO