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LT1720IDD#PBF

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LT1720/LT1721
1
17201fc
TYPICAL APPLICATION
DESCRIPTION
Dual/Quad, 4.5ns, Single
Supply 3V/5V Comparators
with Rail-to-Rail Outputs
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 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 profi le (0.8mm)
dual fi ne 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
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
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 Specifi ed Limits
n
Low Dynamic Current Drain; 15μA/(V-MHz),
Dominated by Load In Most Circuits
n
Tiny 3mm × 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
DELAY (ns)
30
50
17201 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
)
LT1720/LT1721
2
17201fc
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
to GND ........................................7V
Input Current ....................................................... ±10mA
Output Current (Continuous) ............................. ±20mA
Junction Temperature .......................................... 150°C
(DD Package) .................................................... 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
TOP VIEW
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1+IN A
–IN A
–IN B
+IN B
V
CC
OUT A
OUT B
GND
9
T
JMAX
= 125°C, θ
JA
= 160°C/W
UNDERSIDE METAL INTERNALLY
CONNECTED TO GND
1
2
3
4
+IN A
–IN A
–IN B
+IN B
8
7
6
5
V
CC
OUT A
OUT B
GND
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 230°C/W
TOP VIEW
V
CC
OUT A
OUT B
GND
+IN A
–IN A
–IN B
+IN B
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
T
JMAX
= 150°C, θ
JA
= 200°C/W
1
2
3
4
5
6
7
8
TOP VIEW
GN PACKAGE
16-LEAD NARROW
PLASTIC SSOP
S PACKAGE
16-LEAD PLASTIC SO
16
15
14
13
12
11
10
9
–IN A
+IN A
GND
OUT A
OUT B
GND
+IN B
–IN B
–IN D
+IN D
V
CC
OUT D
OUT C
V
CC
+IN C
–IN C
T
JMAX
= 150°C, θ
JA
= 135°C/W (GN)
T
JMAX
= 150°C, θ
JA
= 115°C/W (S)
PIN CONFIGURATION
Storage Temperature Range ................... –65°C to 150°C
(DD Package) ..................................... –65°C to 125°C
Operating Temperature Range
C Grade ................................................... 0°C to 70°C
I Grade ............................................... –40°C to 85°C
LT1720/LT1721
3
17201fc
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage
l
2.7 6 V
I
CC
Supply Current (Per Comparator) V
CC
= 5V
V
CC
= 3V
l
l
4
3.5
7
6
mA
mA
V
CMR
Common Mode Voltage Range (Note 2)
l
–0.1 V
CC
– 1.2 V
V
TRIP
+
Input Trip Points (Note 3)
l
–2.0
–3.0
5.5
6.5
mV
mV
V
TRIP
–
Input Trip Points (Note 3)
l
–5.5
–6.5
2.0
3.0
mV
mV
V
OS
Input Offset Voltage (Note 3)
l
1.0 3.0
4.5
mV
mV
V
HYST
Input Hysteresis Voltage (Note 3)
l
2.0 3.5 7.0 mV
ΔV
OS
/ΔT
Input Offset Voltage Drift
l
10 μV/°C
I
B
Input Bias Current
l
–6 0 μA
I
OS
Input Offset Current
l
0.6 μA
CMRR Common Mode Rejection Ratio (Note 4)
l
55 70 dB
PSRR Power Supply Rejection Ratio (Note 5)
l
65 80 dB
A
V
Voltage Gain (Note 6)
∞
V
OH
Output High Voltage I
SOURCE
= 4mA, V
IN
= V
TRIP
+
+ 10mV
l
V
CC
– 0.4 V
V
OL
Output Low Voltage I
SINK
= 10mA, V
IN
= V
TRIP
–
– 10mV
l
0.4 V
t
PD20
Propagation Delay V
OVERDRIVE
= 20mV (Note 7)
l
4.5 6.5
8.0
ns
ns
t
PD5
Propagation Delay V
OVERDRIVE
= 5mV (Notes 7, 8)
l
710
13
ns
ns
The l denotes specifi cations that apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 5V, V
CM
= 1V, C
OUT
= 10pF, V
OVERDRIVE
= 20mV, unless otherwise specifi ed.
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1720CDD#PBF LT1720CDD#TRPBF LAAV
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LT1720IDD#PBF LT1720IDD#TRPBF LAAV
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LT1720CMS8#PBF LT1720CMS8#TRPBF LTDS 8-Lead Plastic MSOP 0°C to 70°C
LT1720IMS8#PBF LT1720IMS8#TRPBF LTACW 8-Lead Plastic MSOP –40°C to 85°C
LT1720CS8#PBF LT1720CS8#TRPBF 1720 8-Lead Plastic SO 0°C to 70°C
LT1720IS8#PBF LT1720IS8#TRPBF 1720I 8-Lead Plastic SO –40°C to 85°C
LT1721CGN#PBF LT1721CGN#TRPBF 1721 16-Lead Narrow Plastic SSOP 0°C to 70°C
LT1721IGN#PBF LT1721IGN#TRPBF 1721I 16-Lead Narrow Plastic SSOP –40°C to 85°C
LT1721CS#PBF LT1721CS#TRPBF 1721 16-Lead Plastic SO 0°C to 70°C
LT1721IS#PBF LT1721IS#TRPBF 1721I 16-Lead Plastic SO –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LT1720IDD#PBF

Mfr. #:
Buy LT1720IDD#PBF
Manufacturer:
Analog Devices Inc.
Description:
Analog Comparators Dual 3V/5V Hi Speed Comparator
Lifecycle:
New from this manufacturer.
Delivery:
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