LINEAR TECHNOLOGY LTC6702 Technical data

LTC6702

Tiny Micropower,

Low Voltage

Dual Comparators

FEATURES

n

Low Supply Operation: 1.7V Minimum

n

Low Supply Current: 30μA/Comparator Maximum

n

Propagation Delay: 500ns Maximum (–40°C to

125°C)

n

3.2MHz Toggle Frequency

n

Input Voltage Range Extends 100mV Below Ground

n

Internal Hysteresis: 4mV

n

High Output Drive: TTL and CMOS Compatible

Specifi ed at ±15mA (–40°C to 125°C),
Capacitive Load Handling to 10,000pF

n

Specifi ed for –40°C to 125°C Temperature Range

n

Available in SOT-23 and 2mm × 2mm DFN Package

APPLICATIONS

n

Battery Powered Systems

n

Window Comparators

n

Threshold Detectors/Discriminators

n

Clock Regeneration

n

Automotive Sensing and Controls

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 mov­ing 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.

TYPICAL APPLICATION

Clock Regeneration Circuit

LT6650

OUT

FB

CLOCK INPUT > 100mV

0.1MF

IN

VR= 400mV
REFERENCE

+

–

C1

0.1MF

+

= 3V

V

600

V+ = 5V

= 100mV

V

1/2 LTC6702

–

1k

+

P-P

RECOVERED

CLOCK

(UP TO 3.2MHz)

6702 TA01

STEP

500

FALLING

400

RISING

300

PROPAGATION DELAY (ns)

200

100

0

10 20

C

= 10pF

LOAD

= 25°C

T

A

40

30 50 80

INPUT OVERDRIVE (mV)

60 70

6702 TA01b

6702f

1

Propagation Delay vs Input Overdrive

LTC6702

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Supply Voltage (V+ to GND) ........................................6V

Input Voltage ...............................................................6V

Input Current ........................................................–10mA

Output Short-Circuit Duration (Note 2) ............ Indefi nite

Operating Temperature Range (Note 3)

LTC6702C ...........................................–40°C to 85°C

LTC6702I .............................................–40°C to 85°C

LTC6702H .........................................–40°C to 125°C

Specifi ed Temperature Range (Note 4)

PIN CONFIGURATION

TOP VIEW

+

1

OUT A

2

–IN A

+IN A

GND

8-LEAD (2mm × 2mm) PLASTIC DFN

T

EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB

A

3

4

DC PACKAGE

= 150°C, θJA = 102°C/W

JMAX

8

9

V

OUT B

7

–IN B

6

B

+IN B

5

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

TOP VIEW

OUT A

–IN A
+IN A

GND

TS8 PACKAGE

8-LEAD PLASTIC TSOT-23

T

= 150°C, θJA = 130°C/W

JMAX

+

V
OUT B
–IN B
+IN B

ORDER INFORMATION

Lead Free Finish

TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LTC6702CDC#TRMPBF LTC6702CDC#TRPBF LCZJ 8-Lead (2mm × 2mm) Plastic DFN 0°C to 70°C
LTC6702IDC#TRMPBF LTC6702IDC#TRPBF LCZJ 8-Lead (2mm × 2mm) Plastic DFN –40°C to 85°C
LTC6702HDC#TRMPBF LTC6702HDC#TRPBF LCZJ 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LTC6702CTS8#TRMPBF LTC6702CTS8#TRPBF LTCZK 8-Lead Plastic TSOT-23 0°C to 70°C
LTC6702ITS8#TRMPBF LTC6702ITS8#TRPBF LTCZK 8-Lead Plastic TSOT-23 –40°C to 85°C
LTC6702HTS8#TRMPBF LTC6702HTS8#TRPBF LTCZK 8-Lead Plastic TSOT-23 –40°C to 125°C
TRM = 500 pieces. *Temperature grades are identifi ed by a label on the shipping container.
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.

Consult LTC Marketing for information on 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/

6702f

2

LTC6702

ELECTRICAL CHARACTERISTICS

The l denotes the specifi cations which apply over the full specifi ed
temperature range, otherwise specifi cations are at T

= 25°C. V+ = 3V, VCM = 1.5V, C

A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

+

V

I+ Supply Current per Comparator V

Supply Voltage Guaranteed by PSRR

+

= 3V

V+ = 5V

V

OS

Input Offset Voltage (Note 5)

LTC6702C/LTC6702I
LTC6702H

V

HYST

Input Hysteresis Voltage (Note 5)

LTC6702C/LTC6702I
LTC6702H

ΔV

/ΔT Input Offset Voltage Drift (Note 5)

OS

I

IN

Input Leakage Current

LTC6702C/LTC6702I
LTC6702H

CMRR Common Mode Rejection Ratio V

= –0.1V to VDD – 1.2V

CM

Input Voltage Range Guaranteed by CMRR

+

PSRR Power Supply Rejection Ratio V

V

OL

V

OH

t

PD

Δt

t

SKEW

t

r

t

f

f

MAX

I

SC

PD

Output Swing Low Overdrive = 20mV (Note 6)

Output Swing High Overdrive = 20mV (Note 6)

Propagation Delay (Note 7)

Differential Propagation Delay Between Channels 4 ns

Propagation Delay Skew Between t

Output Rise Time 11 ns

Output Fall Time 15 ns

Maximum Toggle Frequency 3.2 MHz

Short-Circuit Current V+ = 5V ±250 mA

= 1.7V to 5.5V, VCM = 0.5V

I

= 100μA

SINK

I

= 15mA

SINK

I

= 100μA

SOURCE

I

= 15mA

SOURCE

PDLH/tPDHL

= 20pF, unless otherwise noted.

OUT

l

1.7 5.5 V

l

l

l
l

2.5

l

1.6

l

1.6

l

4.3 6.2

0.001

l
l

58

l

56

l

–0.1 VDD – 1.2 V

56

l

54

l
l

l
l

320 450

l

24 30

40

25 32

42

1 3.5

5
6

μA
μA

μA
μA

mV
mV
mV

mV

7.2

8.2

6

μV/

mV
mV

°C

nA

1

10

nA
nA

70 dB

dB

65 dB

dB

mV

10

250

mV
mV

mV

10

350

mV
mV

ns

500

ns

4 ns

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

specifi ed for the DC and

JA

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 specifi ed performance from
0°C to 70°C. The LTC6702C is designed, characterized and expected to

meet specifi ed performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures. The LTC6702I is guaranteed to meet
specifi ed performance from –40°C to 85°C. The LTC6702H is guaranteed
to meet specifi ed performance from –40°C to 125°C.

Note 5: The LTC6702 comparators include internal hysteresis. The offset
voltage is defi ned as the average of the input voltages (trip points)
required to change the output in each direction minus V

, while the

CM

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

50

40

30

20

10

SUPPLY CURRENT PER COMPARATOR (μA)

0

0

234

1

SUPPLY VOLTAGE (V)

Input Offset Current
vs Input Voltage

100

V+ = 3V

90

80

70

60

50

40

30

20

INPUT OFFSET CURRENT (pA)

10

0

–1

0

2

1

INPUT VOLTAGE (V)

125°C

25°C

–55°C

56

6702 G01

Supply Current
vs Temperature

35

30

25

20

15

10

5

SUPPLY CURRENT PER COMPARATOR (μA)

0

–50

–25 0

V+ = 5V

V+ = 1.7V

50 100 125

25 75

TEMPERATURE (°C)

V+ = 3V

6702 G02

Input Leakage Current
vs Input Voltage

5

V+ = 3V

4

3

2

1

–55°C

INPUT LEAKAGE CURRENT (nA)

0

–1

–1

125°C

25°C

1

0

INPUT VOLTAGE (V)

85°C

2

3

4

5

6702 G03

6

Maximum Toggle Rate

Supply Current vs Toggle Rate

450

V

125°C

85°C
25°C

–55°C

3

4

5

6702 G04

400

350

300

250

200

150

100

SUPPLY CURRENT PER COMPARATOR (μA)

6

= 200mV

STEP

OVERDRIVE = 100mV

= 25°C

T

A

NO C

LOAD

50

0

10k

V+ = 5V

V+ = 3V

V+ = 1.7V

100k 1M 10M

TOGGLE RATE (Hz)

6702 G05

vs Temperature

4

V

= 200mV

STEP

OVERDRIVE = 100mV

= 10pF

C

LOAD

3

MAXIMUM TOGGLE RATE (MHz)

2

–50

–25 0

25 75

TEMPERATURE (°C)

V+ = 3V

V+ = 5V

V+ = 1.7V

50 100 125

6702 G06

Input Offset Voltage
vs Supply Voltage Hysteresis vs Supply Voltage

5

4

3

2

1

0

–1

–2

–3

INPUT OFFSET VOLTAGE (mV)

–4

–5

1

25°C

–55°C

2

3

SUPPLY VOLTAGE (V)

4

125°C

5

6

6702 G07

8

7

6

5

4

3

HYSTERESIS (mV)

2

1

0

1

23 5

SUPPLY VOLTAGE (V)

4

Input Common Mode Limits
vs Temperature

+

V

+

–0.5

V

125°C

25°C

–55°C

4

6702 G08

V+–1.0

+

V

–1.5

GND

–0.5

INPUT COMMON MODE LIMITS (V)

6

–1.0

–50

–25 0

50 100 125

25 75

TEMPERATURE (°C)

6702 G09

6702f