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LT1721 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LT1721은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 LT1721 기능
기능 Dual/Quad/ 4.5ns/ Single Supply 3V/5V Comparators with Rail-to-Rail Outputs
제조업체 Linear Technology
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LT1721 데이터시트, 핀배열, 회로
LT1720/LT1721
FEATURES
Dual/Quad, 4.5ns, Single
Supply 3V/5V Comparators
with Rail-to-Rail Outputs
DESCRIPTION
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; 15μA/(V-MHz),
Dominated by Load In Most Circuits
n Tiny 3mm × 3mm × 0.75mm DFN Package (LT1720)
APPLICATIONS
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
The LT®1720/LT1721 are UltraFastTM 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 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.
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.
TYPICAL APPLICATION
2.7V to 6V Crystal Oscillator with TTL/CMOS Output
2.7V TO 6V
2k
1MHz TO 10MHz
CRYSTAL (AT-CUT)
220Ω
620Ω
GROUND
+ CASE
C1
1/2 LT1720
2k
0.1μF
1.8k
OUTPUT
17201 TA01
Propagation Delay vs Overdrive
8
7
6
RISING EDGE
(tPDLH)
5
25°C
VSTEP = 100mV
VCC = 5V
CLOAD = 10pF
4
FALLING EDGE
3 (tPDHL)
2
1
0
0 10 20 30 40 50
OVERDRIVE (mV)
17201 TA02
17201fc
1




LT1721 pdf, 반도체, 판매, 대치품
LT1720/LT1721
ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VCC = 5V, VCM = 1V, COUT = 10pF, VOVERDRIVE = 20mV, unless otherwise specified.
SYMBOL
ΔtPD
tSKEW
tr
tf
tJITTER
fMAX
PARAMETER
Differential Propagation Delay
Propagation Delay Skew
Output Rise Time
Output Fall Time
Output Timing Jitter
Maximum Toggle Frequency
CONDITIONS
(Note 9) Between Channels
(Note 10) Between tPDLH/tPDHL
10% to 90%
90% to 10%
VIN = 1.2VP-P (6dBm), ZIN = 50Ω
VCM = 2V, f = 20MHz
VOVERDRIVE = 50mV, VCC = 3V
VOVERDRIVE = 50mV, VCC = 5V
tPDLH
tPDHL
MIN TYP MAX UNITS
0.3 1.0
ns
0.5 1.5
ns
2.5 ns
2.2 ns
15 psRMS
11 psRMS
70.0 MHz
62.5 MHz
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: If one input is within these common mode limits, the other input
can go outside the common mode limits and the output will be valid.
Note 3: The LT1720/LT1721 comparators include internal hysteresis.
The trip points are the input voltage needed to change the output state in
each direction. The offset voltage is defined as the average of VTRIP+ and
VTRIP–, while the hysteresis voltage is the difference of these two.
Note 4: The common mode rejection ratio is measured with VCC = 5V
and is defined as the change in offset voltage measured from VCM = –0.1V
to VCM = 3.8V, divided by 3.9V.
Note 5: The power supply rejection ratio is measured with VCM = 1V and
is defined as the change in offset voltage measured from VCC = 2.7V to
VCC = 6V, divided by 3.3V.
Note 6: Because of internal hysteresis, there is no small-signal region
in which to measure gain. Proper operation of internal circuity is ensured
by measuring VOH and VOL with only 10mV of overdrive.
Note 7: Propagation delay measurements made with 100mV steps.
Overdrive is measured relative to VTRIP±.
Note 8: tPD cannot be measured in automatic handling equipment with
low values of overdrive. The LT1720/LT1721 are 100% tested with a
100mV step and 20mV overdrive. Correlation tests have shown that
tPD limits can be guaranteed with this test, if additional DC tests are
performed to guarantee that all internal bias conditions are correct.
Note 9: Differential propagation delay is defined as the larger of the two:
ΔtPDLH = tPDLH(MAX) – tPDLH(MIN)
ΔtPDHL = tPDHL(MAX) – tPDHL(MIN)
where (MAX) and (MIN) denote the maximum and minimum values
of a given measurement across the different comparator channels.
Note 10: Propagation Delay Skew is defined as:
tSKEW = |tPDLH – tPDHL|
TYPICAL PERFORMANCE CHARACTERISTICS
Input Offset and Trip Voltages
vs Supply Voltage
3
VTRIP+
2
1
VOS
0
–1 VTRIP–
–2
25°C
VCM = 1V
–3
2.5 3.0 3.5
4.0 4.5
5.0
SUPPLY VOLTAGE (V)
5.5 6.0
17201 G01
4
Input Offset and Trip Voltages
vs Temperature
3
VTRIP+
2
1
VOS
0
–1 VTRIP–
–2
–3
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
17201 G02
Input Common Mode Limits
vs Temperature
4.2
VCC = 5V
4.0
3.8
3.6
0.2
0
–0.2
–0.4
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
17201 G03
17201fc

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LT1721 전자부품, 판매, 대치품
TEST CIRCUITS
15VP-P
BANDWIDTH-LIMITED
TRIANGLE WAVE
~1kHz
VCC
0.1μF
50k
+
50Ω
50Ω
DUT
1/2 LT1720 OR
VCM 1/4 LT1721
200k
LT1720/LT1721
±VTRIP Test Circuit
LTC203
14 15 3
2
10nF
16 1
98
11 10 6
7
1000 s VTRIP+
1μF
10k
1/2 LT1112
–+
1000 s VHYST
LTC203
1/2 LT1638
+
100k
100k
100k
100k
+
1/2 LT1638
2.4k
3
0.15μF
6
NOTES: LT1638, LT1112, LTC203s ARE POWERED FROM p15V.
200kW PULL-DOWN PROTECTS LTC203 LOGIC INPUTS
WHEN DUT IS NOT POWERED
1
8
1000 s VOS
10k
2 14
15
10nF
16
1μF
9
7 11
10
17201 TC01
1/2 LT1112
–+
1000 s VTRIP–
Response Time Test Circuit
0V
0.1μF
130Ω
–100mV
DUT
1/2 LT1720 OR
1/4 LT1721
25Ω
25Ω
50k
V1* 50Ω
+VCC – VCM
+ 0.01μF
0.01μF
10 s SCOPE PROBE
(CIN ≈ 10pF)
PULSE
2N3866
0V IN 1N5711
–3V
–VCM
50Ω 400Ω 750Ω
*V1 = –1000 • (OVERDRIVE VTRIP+)
NOTE: RISING EDGE TEST SHOWN.
–5V FOR FALLING EDGE, REVERSE LT1720 INPUTS
17201 TC02
17201fc
7

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