lt1719cs8-trpbf Linear Technology Corporation, lt1719cs8-trpbf Datasheet

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lt1719cs8-trpbf

Manufacturer Part Number
lt1719cs8-trpbf
Description
4.5ns Single/dual Supply 3v/5v Comparator With Rail-to-rail Output
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIO S
TYPICAL
UltraFast: 4.5ns at 20mV Overdrive
Low Power: 4.2mA at 3V
SOT-23 Package
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: 0.1 A
High Speed Differential Line Receiver
Crystal Oscillator Circuits
Level Translators
Threshold Detectors/Discriminators
Zero-Crossing Detectors
High Speed Sampling Circuits
Delay Lines
2.7V to 6V Crystal Oscillator with TTL/CMOS Output
2.7V TO 6V
620
2k
7ns at 5mV Overdrive
APPLICATION
220
U
0.1 F
+
CRYSTAL (AT-CUT)
LT1719
1MHz TO 10MHz
C1
1.8k
GROUND
CASE
2k
U
1719 TA01
OUTPUT
DESCRIPTIO
The LT
voltage operation. The input voltage range extends from
100mV below V
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.
UltraFast is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
4.5ns Single/Dual Supply
3V/5V Comparator with
®
1719 is an UltraFast
8
7
6
5
4
3
2
1
0
0
Propagation Delay vs Overdrive
EE
Rail-to-Rail Output
RISING EDGE
to 1.2V below V
10
U
(t
PDLH
OVERDRIVE (mV)
)
20
TM
comparator optimized for low
FALLING EDGE
30
25 C
V
V
C
(t
STEP
+
LOAD
= 5V
PDHL
CC
= 100mV
= 10pF
40
)
. Internal hysteresis
1719 TA02
50
LT1719
1

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lt1719cs8-trpbf Summary of contents

Page 1

... 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. , LTC and LT are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation ...

Page 2

... I = 4mA 10mV (LT1719S8) SOURCE IN TRIP (LT1719S6 INFORMATION ORDER PART TOP VIEW NUMBER LT1719CS8 + 7 OUT LT1719IS8 – SHDN 6 5 GND S8 PART MARKING S8 PACKAGE 1719 = 150 C, = 110 C/ W 1719I JA ORDER PART NUMBER TOP VIEW LT1719CS6 6 SHDN ...

Page 3

ELECTRICAL CHARACTERISTICS range, otherwise specifications are and V = –5V, for the LT1719S6 SYMBOL PARAMETER V Output Low Voltage OL t Propagation Delay PD20 t Propagation Delay PD5 ...

Page 4

LT1719 ELECTRICAL CHARACTERISTICS Note 8: Because of internal hysteresis, there is no small-signal region in which to measure gain. Proper operation of internal circuity is ensured by measuring V and V with only 10mV of overdrive Note 9: ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS Propagation Delay vs Load Capacitance RISING EDGE 100mV STEP (t ) PDLH OVERDRIVE = 20mV + – ...

Page 6

LT1719 W U TYPICAL PERFORMANCE CHARACTERISTICS Shutdown Currents vs Temperature SHUTDOWN = +V – 0. SHUTDOWN PIN OPEN 0.1 –50 – TEMPERATURE ( PIN FUNCTIONS LT1719S8 V (Pin 1): Positive ...

Page 7

TEST CIRCUITS PULSE 0V IN –3V 50 BANDWIDTH-LIMITED TRIANGLE WAVE ~ 1kHz 0.1 F 50k + DUT 50 LT1719 50 – 200k V CM 1/2 LT1638 100k 100k + – + 100k – 100k 1/2 ...

Page 8

LT1719 U U APPLICATIONS INFORMATION Power Supply Configurations (SO-8 Package) The LT1719S8 has separate supply pins for the input and output stages that allow flexible operation, accommodat- ing separate voltage ranges for the analog input and the output logic. Of ...

Page 9

U U APPLICATIONS INFORMATION equal to the supply voltage, limited only by the absolute maximum currents noted. External input protection cir- cuitry is only needed if currents would otherwise exceed these absolute maximums. The internal catch diodes can conduct current ...

Page 10

LT1719 U U APPLICATIONS INFORMATION shutdown is active high, this resistor adds little power drain during shutdown. A logic high disables the compara- tor. The LT1719S8 logic interface is based on the output power rails and GND. S ...

Page 11

U U APPLICATIONS INFORMATION Additional hysteresis may be added externally. The rail-to- rail outputs of the LT1719 make this more predictable than with TTL output comparators due to the LT1719’s small variability of V (output high voltage add ...

Page 12

LT1719 U U APPLICATIONS INFORMATION Interfacing the LT1719 to ECL The LT1719 comparators can be used in high speed applications where Emitter-Coupled Logic (ECL) is de- ployed. To interface the output of the LT1719 to ECL logic inputs, standard TTL/CMOS ...

Page 13

U U APPLICATIONS INFORMATION Figure 6a shows the standard TTL to Positive ECL (PECL) resistive level translator. This translator cannot be used for the LT1719, or with CMOS logic, because it depends on the 820 resistor to limit the output ...

Page 14

LT1719 U U APPLICATIONS INFORMATION Circuit Description The block diagram of the LT1719 is shown in Figure 7. The circuit topology consists of a differential input stage, a gain stage with hysteresis and a complementary com- mon-emitter output stage. All ...

Page 15

U U APPLICATIONS INFORMATION Speed Limits The LT1719 comparator is intended for high speed appli- cations, where it is important to understand a few limita- tions. These limitations can roughly be divided into three categories: input speed limits, output speed ...

Page 16

LT1719 U U APPLICATIONS INFORMATION V Test Circuit TRIP The input trip points test circuit uses a 1kHz triangle wave to repeatedly trip the comparator being tested. The LT1719 output is used to trigger switched capacitor sampling of the triangle ...

Page 17

PLIFIED SCHE ATIC LT1719 17 ...

Page 18

LT1719 PACKAGE DESCRIPTION 0.010 – 0.020 (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 (0.406 – 1.270) * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES ...

Page 19

... SC-74A (EIAJ) FOR ORIGINAL JEDEC MO-193 FOR THIN Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U Dimensions in inches (millimeters) unless otherwise noted ...

Page 20

... Rail-to-Rail Inputs and Outputs Dual/Quad Comparator Similar to the LT1719 sine wave at P-P at 10MHz, the LT1719 delay starts to de – 10MHz 632mV 2V 6.32V P-P P-P P INPUT AMPLITUDE (dBm) 1719 F08b 1719f LT/TP 1100 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2000 ...

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