LTC6702
Tiny Micropower,
Low Voltage
Dual Comparators
FEATURES
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DESCRIPTION
The LTC
®
6702 is an extremely small dual comparator
designed to maximize battery life while providing both
speed and low voltage operation in applications where
board space is a premium.
These comparators operate on supplies between 1.7V and
5.5V, and have a maximum guaranteed propagation delay
of 500ns while drawing only 30μA maximum quiescent
current. Internal hysteresis desensitizes the LTC6702 to
input noise and makes it easy to use, even with slow mov-
ing signals. CMOS inputs allow the use of large source
impedances.
The LTC6702 is available in the 8-pin SOT-23 and the tiny
2mm
×
2mm DFN package.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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Low Supply Operation: 1.7V Minimum
Low Supply Current: 30μA/Comparator Maximum
Propagation Delay: 500ns Maximum (–40°C to
125°C)
3.2MHz Toggle Frequency
Input Voltage Range Extends 100mV Below Ground
Internal Hysteresis: 4mV
High Output Drive: TTL and CMOS Compatible
Specified at ±15mA (–40°C to 125°C),
Capacitive Load Handling to 10,000pF
Specified for –40°C to 125°C Temperature Range
Available in SOT-23 and 2mm
×
2mm DFN Package
APPLICATIONS
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Battery Powered Systems
Window Comparators
Threshold Detectors/Discriminators
Clock Regeneration
Automotive Sensing and Controls
TYPICAL APPLICATION
Clock Regeneration Circuit
V
+
= 3V
Propagation Delay vs Input Overdrive
600
C
LOAD
= 10pF
V
+
= 5V
V
STEP
= 100mV T
A
= 25°C
FALLING
400
RISING
300
IN
V
R
= 400mV
REFERENCE
LT6650
+
–
OUT
C1
0.1 F
1k
–
+
RECOVERED
CLOCK
(UP TO 3.2MHz)
6702 TA01
0.1 F
FB
PROPAGATION DELAY (ns)
1/2 LTC6702
500
200
CLOCK INPUT > 100mV
P-P
100
0
10
50 60
20 30 40
INPUT OVERDRIVE (mV)
70
80
6702 TA01b
6702f
1
LTC6702
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (V
+
to GND) ........................................6V
Input Voltage...............................................................6V
Input Current........................................................–10mA
Output Short-Circuit Duration (Note 2) ............ Indefinite
Operating Temperature Range (Note 3)
LTC6702C ...........................................–40°C to 85°C
LTC6702I .............................................–40°C to 85°C
LTC6702H .........................................–40°C to 125°C
Specified Temperature Range (Note 4)
LTC6702C ............................................... 0°C to 70°C
LTC6702I .............................................–40°C to 85°C
LTC6702H .........................................–40°C to 125°C
Junction Temperature .......................................... 150°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT Packages ................................................. 300°C
PIN CONFIGURATION
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
GND 4
9
A
B
8 V
+
7 OUT B
6 –IN B
5 +IN B
OUT A
–IN A
+IN A
GND
TOP VIEW
V
+
OUT B
–IN B
+IN B
DC PACKAGE
8-LEAD (2mm
×
2mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 102°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 130°C/W
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI)
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
LTC6702CDC#TRMPBF
LTC6702CDC#TRPBF
LCZJ
8-Lead (2mm
×
2mm) Plastic DFN
LTC6702IDC#TRMPBF
LTC6702IDC#TRPBF
LCZJ
8-Lead (2mm
×
2mm) Plastic DFN
LTC6702HDC#TRMPBF
LTC6702HDC#TRPBF
LCZJ
8-Lead (2mm
×
2mm) Plastic DFN
LTC6702CTS8#TRMPBF
LTC6702CTS8#TRPBF
LTCZK
8-Lead Plastic TSOT-23
LTC6702ITS8#TRMPBF
LTC6702ITS8#TRPBF
LTCZK
8-Lead Plastic TSOT-23
LTC6702HTS8#TRMPBF
LTC6702HTS8#TRPBF
LTCZK
8-Lead Plastic TSOT-23
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
6702f
2
LTC6702
ELECTRICAL CHARACTERISTICS
SYMBOL
V
+
I+
PARAMETER
Supply Voltage
Supply Current per Comparator
The
l
denotes the specifications which apply over the full specified
,
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 3V, V
CM
= 1.5V, C
OUT
= 20pF unless otherwise noted.
CONDITIONS
Guaranteed by PSRR
V
+
= 3V
V
+
= 5V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
1.7
TYP
24
25
1
MAX
5.5
30
40
32
42
3.5
5
6
6.2
7.2
8.2
UNITS
V
μA
μA
μA
μA
mV
mV
mV
mV
mV
mV
μV/
°
C
nA
nA
nA
dB
dB
V
OS
Input Offset Voltage
(Note 5)
LTC6702C/LTC6702I
LTC6702H
(Note 5)
LTC6702C/LTC6702I
LTC6702H
(Note 5)
LTC6702C/LTC6702I
LTC6702H
V
HYST
Input Hysteresis Voltage
2.5
1.6
1.6
4.3
ΔV
OS
/ΔT
I
IN
Input Offset Voltage Drift
Input Leakage Current
6
0.001
1
10
58
56
–0.1
56
54
65
70
V
DD
– 1.2
CMRR
Common Mode Rejection Ratio
Input Voltage Range
V
CM
= –0.1V to V
DD
– 1.2V
Guaranteed by CMRR
V
+
= 1.7V to 5.5V, V
CM
= 0.5V
Overdrive = 20mV (Note 6)
I
SINK
= 100μA
I
SINK
= 15mA
Overdrive = 20mV (Note 6)
I
SOURCE
= 100μA
I
SOURCE
= 15mA
(Note 7)
Between Channels
Between t
PDLH
/t
PDHL
V
dB
dB
PSRR
V
OL
Power Supply Rejection Ratio
Output Swing Low
10
250
10
350
320
4
4
11
15
3.2
450
500
mV
mV
mV
mV
mV
mV
ns
ns
ns
ns
ns
ns
MHz
mA
V
OH
Output Swing High
t
PD
Δt
PD
t
SKEW
t
r
t
f
f
MAX
I
SC
Propagation Delay
Differential Propagation Delay
Propagation Delay Skew
Output Rise Time
Output Fall Time
Maximum Toggle Frequency
Short-Circuit Current
V
+
= 5V
±250
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:
A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply voltage and
how many comparators are shorted. The
θ
JA
specified for the DC and
TS packages is with minimal PCB heat spreading metal. Using expanded
metal area on all layers of a board reduces this value.
Note 3:
The LTC6702C and LTC6702I are guaranteed functional over
the temperature range of –40°C to 85°C. The LTC6702H is guaranteed
functional over the operating temperature range of –40°C to 125°C.
Note 4:
The LTC6702C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6702C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures. The LTC6702I is guaranteed to meet
specified performance from –40°C to 85°C. The LTC6702H is guaranteed
to meet specified performance from –40°C to 125°C.
Note 5:
The LTC6702 comparators include internal hysteresis. The offset
voltage is defined as the average of the input voltages (trip points)
required to change the output in each direction minus V
CM
, while the
hysteresis voltage is the difference of these trip points.
Note 6:
Output voltage swings are measured between the output and
power supply rails.
Note 7:
Propagation delay is for 200mV steps, and 50mV of overdrive.
Overdrive is measured relative to the positive and negative trip points.
6702f
3
LTC6702
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
vs Supply Voltage
SUPPLY CURRENT PER COMPARATOR (μA)
SUPPLY CURRENT PER COMPARATOR (μA)
50
35
V
+
= 3V
V
+
= 5V
V
+
= 1.7V
INPUT LEAKAGE CURRENT (nA)
30
25
20
15
10
5
0
–50 –25
4
125°C
3
2
1
–55°C
0
25°C
50
25
75
0
TEMPERATURE (°C)
100
125
–1
–1
0
3
2
1
4
INPUT VOLTAGE (V)
5
6
6702 G03
Supply Current
vs Temperature
5
Input Leakage Current
vs Input Voltage
V
+
= 3V
40
30
125°C
25°C
–55°C
20
10
85°C
0
0
1
2
3
4
SUPPLY VOLTAGE (V)
5
6
6702 G01
6702 G02
Input Offset Current
vs Input Voltage
90
INPUT OFFSET CURRENT (pA)
80
70
60
50
40
30
20
10
0
–1
0
3
2
1
4
INPUT VOLTAGE (V)
5
6
6702 G04
Supply Current vs Toggle Rate
125°C
85°C
25°C
–55°C
SUPPLY CURRENT PER COMPARATOR (μA)
V
STEP
= 200mV
400 OVERDRIVE = 100mV
T
A
= 25°C
350 NO C
LOAD
300
250
200
150
100
50
0
10k
V
+
= 1.7V
100k
1M
TOGGLE RATE (Hz)
10M
6702 G05
Maximum Toggle Rate
vs Temperature
4
MAXIMUM TOGGLE RATE (MHz)
V
STEP
= 200mV
OVERDRIVE = 100mV
C
LOAD
= 10pF
V
+
= 3V
100
V
+
= 3V
450
V
+
= 5V
V
+
= 3V
3
V
+
= 5V
V
+
= 1.7V
2
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
6702 G06
Input Offset Voltage
vs Supply Voltage
5
4
INPUT OFFSET VOLTAGE (mV)
3
2
1
0
–1
–2
–3
–4
–5
1
2
4
5
3
SUPPLY VOLTAGE (V)
6
6702 G07
Hysteresis vs Supply Voltage
8
INPUT COMMON MODE LIMITS (V)
7
V
+
V
+
–0.5
V
+
–1.0
V
+
–1.5
GND
–0.5
Input Common Mode Limits
vs Temperature
25°C
6
125°C
–55°C
HYSTERESIS (mV)
5
25°C
4
3
2
1
0
1
2
5
4
SUPPLY VOLTAGE (V)
3
6
6702 G08
125°C
–55°C
–1.0
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
6702 G09
6702f
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LTC6702
TYPICAL PERFORMANCE CHARACTERISTICS
Propagation Delay
vs Supply Voltage
420
400
PROPAGATION DELAY (ns)
380
360
340
320
300
280
RISING
FALLING
RISING
FALLING
800
V
STEP
= 100mV
C
LOAD
= 10pF
25°C, 125°
–55°C
PROPAGATION DELAY (ns)
Propagation Delay
vs Load Capacitance
V
STEP
= 100mV
OVERDRIVE = 50mV
700 T
A
= 25°C
600
500
400
300
200
TIME (ns)
1000
Output Rise and Fall
Times vs Load Capacitance
V
STEP
= 100mV
OVERDRIVE = 50mV
T
A
= 25°C
100
t
f
t
r
t
r
10
FALLING
RISING
1
10
100
1000
LOAD CAPACITANCE (pF)
10000
6702 G12
V
+
= 1.7V
FALLING
RISING
V
+
= 3V, 5V
10
t
f
t
f
t
r
V
+
= 1.7V
V
+
= 3V
V
+
= 5V
1
2
5
4
SUPPLY VOLTAGE (V)
3
6
6702 G10
100
1000
LOAD CAPACITANCE (pF)
10000
6702 011
Output Low Voltage
vs Load Current
1.0
T
A
= 25°C
OUTPUT VOLTAGE (V
+
-V
OUT
) (V)
V
+
= 1.7V
OUTPUT VOLTAGE (V)
V
+
= 3V
1.0
Output High Voltage
vs Load Current
T
A
= 25°C
V
+
= 1.7V
V
+
= 3V
OUTPUT VOLTAGE (mV)
90
80
70
60
50
40
30
20
10
Output Voltage vs Temperature
HIGH = V
+
– V
OUT
I
OUT
=
±4mA
HIGH
0.1
0.1
V
+
= 1.7V
LOW
0.01
V
+
= 5V
V
+
= 5V
0.01
HIGH
LOW
V
+
= 5V
0.001
0.1
1
10
SINK CURRENT (mA)
100
6702 G13
0.001
0.1
1
10
SOURCE CURRENT (mA)
100
6702 G14
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
6702 G15
Propagation Delay
Propagation Delay with Load
10k
1MHz Sinusoid Response
V
OUT
1V/DIV
GND
V
IN
50mV/DIV
V
OUT
1V/DIV
200Ω
GND
V
IN
50mV/DIV
V
OUT
1V/DIV
GND
V
IN
50mV/DIV
100ns/DIV
V
+
= 3V
C
L
= 20pF
V
CM
= 500mV
6702 G16
V
+
= 3V
C
L
= 20pF
100ns/DIV
V
CM
= 500mV
R
L
= 10k, 200Ω
6702 G17
200ns/DIV
V
+
= 3V
C
L
= 20pF
V
CM
= 500mV
6702 G18
6702f
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