FeaTures
n
n
LTC6754
High Speed Rail-to-Rail
Input Comparator with
LVDS Compatible Outputs
DescripTion
The
LTC
®
6754
is a high speed rail-to-rail comparator with
LVDS compatible outputs. The LTC6754 exhibits 1.8ns of
propagation delay, only 1ns of dispersion (10mV to 125mV
overdrive) and a toggle rate up to 890Mbps.
The LTC6754 has rail-to-rail inputs, and will operate from
a 2.4V to 5.25V supply. For the QFN package, the LVDS
output is operated with a separate supply, providing isola-
tion between input and output circuitry, and allowing for
logic level translation.
In shutdown mode, power is reduced from 13.4mA to
under 1.1mA, and the comparator can wake up in 120ns.
The LTC6754 includes 4.5mV of hysteresis to minimize
instability. For the QFN package, a separate pin is available
to set the hysteresis from 0mV (off) up to 40mV. The QFN
version also features output latching to provide the ability
to quickly capture the state of the comparator.
The dispersion of only 1ns combined with excellent
propagation delay of 1.8ns makes the device an excel-
lent choice for timing critical applications. Similarly, the
890Mbps toggle rate and low jitter of 1.5ps
RMS
(200mV
P–P
,
245.76MHz input) make the LTC6754 ideally suited for
high frequency line driver and clock recovery circuits.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Low Propagation Delay: 1.8ns Typ.
Low Overdrive Dispersion: 1ns Typ.
(10mV to 125mV Overdrive)
High Toggle Rate: 890Mbps Typ.
LVDS Compatible Output Stage
Rail-to-Rail Inputs Extend Beyond Both Rails
Low Quiescent Current: 13.4mA
Supply Range: 2.4V to 5.25V
Features within the LTC6754 Family:
n
Separate Input and Output Supplies
n
Shutdown Pin for Reduced Power
n
Output Latch and Adjustable Hysteresis
n
SC70 and 3mm
×
3mm QFN Packages
applicaTions
n
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Clock and Data Recovery
Level Translation
High Speed Data Acquisition Systems
Window Comparators
High Speed Line Receivers
Time Domain Reflectometry
Time of Flight Measurements
Cable Drivers
Typical applicaTion
High Speed Differential Line Receiver and LVDS Translator
with Excellent Common Mode Rejection
SMALL DIFFERENTIAL SIGNAL WITH
LARGE COMMON MODE COMPONENT
Q–
Q
V
CCI
V
CCO
+IN
Q–
Q
100mV/DIV
Q
LTC6754
100
Q
6754 T01a
+IN
–IN
+IN, –IN
200mV/DIV
700mV
+
–
V
EE
0mV
–IN
20ns/DIV
6754 F16
For more information
www.linear.com/LTC6754
1
6754f
LTC6754
absoluTe MaxiMuM raTings
(Note 1)
Total Input Supply Voltage (V
EE
to V
CCI
) ..................5.5V
Total Output Supply Voltage (V
EE
to V
CCO
)...............5.5V
Input Voltage
–IN, +IN,
LE/HYST, SHDN
.......V
EE
– 0.3V, V
CCI
+ 0.3V
Input Current
–IN, +IN,
LE/HYST, SHDN
(Note 2) .................. ±10mA
Output Current(Q,
Q)
........................................... ±20mA
Operating Temperature Range (Note 3).. –40°C to 125°C
Specified Temperature Range (Note 4)
LTC6754I .............................................–40°C to 85°C
LTC6754H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
Maximum Junction Temperature (Note 4) ............ 150°C
Lead Temperature Soldering
(10 sec) (SC70 Only) ......................................... 300°C
pin conFiguraTion
TOP VIEW
NC
Q
TOP VIEW
Q1
V
EE
2
+IN 3
6
Q
5 V
CC I
/V
CCO
4 –IN
V
CCO
1
V
CCI
2
V
EE
3
4
+IN
Q
9
8
7
6
–IN
12 11 10
13
V
EE
V
EE
LE/HYST
SHDN
T
JMAX
= 150°C,
θ
JA
= 256°C/W (NOTE 3)
UD PACKAGE
12-LEAD (3mm
×
3mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 68°C/W (NOTE 3)
EXPOSED PAD (PIN 13) IS V
EE
, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC6754ISC6#TRMPBF
LTC6754HSC6#TRMPBF
LTC6754IUD#PBF
LTC6754HUD#PBF
TAPE AND REEL
LTC6754ISC6#TRPBF
LTC6754HSC6#TRPBF
LTC6754IUD#TRPBF
LTC6754HUD#TRPBF
PART MARKING*
LGVH
LGVH
LGVJ
LGVJ
PACKAGE DESCRIPTION
6-Lead Plastic SC-70
6-Lead Plastic SC-70
12-Lead Plastic QFN
12-Lead Plastic QFN
SPECIFIED
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
TRM = 500 pieces. *The temperature grade is 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 nonstandard 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/
NC
SC6 PACKAGE
6-LEAD PLASTIC SC70
5
2
6754f
For more information
www.linear.com/LTC6754
LTC6754
The
l
denotes the specifications which apply over
the specified temperature range, otherwise specifications are at T
A
= 25°C,
LE/HYST, SHDN
pins floating, V
OVERDRIVE
= 50mV,
–IN = V
CM
= 300mV, +IN = –IN + V
OVERDRIVE
, 150mV step size, R
L
=100Ω , unless otherwise noted.
SYMBOL
V
CCI
–V
EE
V
CCO
–V
EE
V
CMR
V
OS
T
C
V
OS
V
HYST
C
IN
R
DM
R
CM
I
B
PARAMETER
Input Supply Voltage (Note 5)
Output Supply Voltage (Note 5)
Input Voltage Range (Note 7)
Input Offset Voltage (Note 6)
l
elecTrical characTerisTics
(V
CCI
= V
CCO
= 5.0V)
CONDITIONS
MIN
l
l
TYP
MAX
5.25
5.25
V
CCI
+ 0.1
UNITS
V
V
mV
mV
µV/ºC
mV
pF
kΩ
MΩ
μA
µA
µA
µA
μA
dB
dB
dB
dB
dB
dB
dB
2.4
2.4
–4
–8.5
±0.75
18
4.5
1.1
55
6.5
l
V
EE
– 0.2
4
8.5
Input Offset Voltage Drift
Input Hysteresis Voltage (Note 5)
Input Capacitance
Differential Mode Resistance
Common Mode Resistance
Input Bias Current
V
CM
= V
EE
+ 0.3V
LE/HYST
pin floating
l
l
–3.8
–4
–1.8
0.6
1.5
2.5
0.7
V
CM
= V
CCI
– 0.3V
l
I
OS
CMRR_LV
CM
CMRR_FR
PSRR
A
VOL
V
OD
ΔV
OD
V
OCM
ΔV
OCM
Input Offset Current
Common Mode Rejection Ratio, Low V
CM
Region
Common Mode Rejection Ratio (Measured at
Extreme Ends of V
CMR
)
Power Supply Rejection Ratio
Open Loop Gain
Differential Output Voltage
Difference in V
OD
Between Complementary
Output States
Output Common Mode Voltage
V
CM
= V
EE
– 0.2V to V
CCI
– 1.5V
l
l
–0.7
58
53
60
50
62
59.5
260
–15
1.18
–10
77
76.5
80
53
V
CM
= V
EE
– 0.2V to V
CCI
+0.1V
l
V
CCI
= V
CCO
Varied from 2.45V to 5.25V
l
Hysteresis Removed (Note 10)
l
l
l
l
l
l
362
±5
1.26
±1.8
420
15
1.31
10
20
5
mV
mV
V
mV
mA
mA
mA
mA
mA
mA
mA
mA
ns
ns
ns
ps
ps
ns
ps
Mbps
Difference in V
OD
Between Complementary
Output States
Short Circuit Current, through Either Output, both
I
SC_VEE
Outputs Connected to V
EE
I
SC_OUT_SHORT
Output Current, Complementary Outputs Shorted
Input Stage Supply Current, Device On
Comparator On, Input Section Supply
I
VCCI
Current
Output Stage Supply Current, Device On
Comparator On, Output Section Supply
I
VCCO
Current
Total Supply Current, Device On
Comparator On, Single Supply Pin Version,
I
VCC
t
R
, t
F
t
PD
Rise/Fall Time
Propagation Delay (Note 8)
20% to 80%
V
OVERDRIVE
= 50mV
2.4
l
11
l
13.4
l
2.9
3
11.8
12.5
14.7
15.5
2.8
2.9
0.77
1.8
l
t
SKEW_RISEFALL
Propagation Delay Skew, Rising to Falling Transition
t
SKEW_COMP
t
OD_DISP
t
CM_DISP
TR
Propagation Delay Skew, Q to
Q
Overdrive Dispersion
Common Mode dispersion
Toggle Rate
Overdrive Varied from 10mV to 125mV
V
CM
Varied from V
EE
– 0.2V to V
CCI
+ 0.1V
V
IN
= 200mV
P–P
Sine Wave, 50% Output Swing
40
50
1
200
890
For more information
www.linear.com/LTC6754
3
6754f
LTC6754
The
l
denotes the specifications which apply
over the specified temperature range, otherwise specifications are at T
A
= 25°C,
LE/HYST, SHDN
pins floating, V
OVERDRIVE
= 50mV,
–IN = V
CM
= 300mV, +IN = –IN + V
OVERDRIVE
, 150mV step size, R
L
=100Ω , unless otherwise noted.
SYMBOL
t
JIT_RMS
PARAMETER
RMS Jitter, Sine Wave Input
CONDITIONS
V
IN
= 200mV
P–P
f
IN
= 245.76MHz, Jitter BW = 10Hz – 122.88MHz
f
IN
= 245.76MHz, Jitter BW = 12kHz – 20MHz
f
IN
= 100MHz, Jitter BW = 10Hz – 50MHz
f
IN
= 100MHz, Jitter BW = 12kHz – 20MHz
f
IN
= 61.44MHz, Jitter BW = 10Hz – 30.72MHz
f
IN
= 61.44MHz, Jitter BW = 12kHz – 20MHz
f
IN
= 10MHz, Jitter BW = 10Hz – 5MHz
Open Circuit
LE/HYST
Pin Voltage < Open Circuit Value
V
LE/HYST
= 800mV
l
l
l
l
elecTrical characTerisTics
(V
CCI
= V
CCO
= 5.0V)
MIN
TYP
1.53
0.7
2.2
1.34
2.93
2.37
20
MAX
UNITS
ps
ps
ps
ps
ps
ps
ps
Latching/Adjustable Hysteresis Characteristics
V
LE/HYST
R
HYST
V
HYST_LARGE
V
IL_LE
V
IH_LE
I
IH_LE
I
IL_LE
t
SETUP
t
HOLD
t
PL
I
SD_VCCI
I
SD_VCCO
I
SD_TOT
t
SD
V
IH_SD
V
IL_SD
t
WAKEUP
LE/HYST
Pin Voltage
Resistor Value at
LE/HYST
Hysteresis Voltage
Latch Pin Voltage, Latch Guaranteed
Latch Pin Voltage, Hysteresis Disabled
Latch Pin Current High
Latch Pin Current Low
Latch Setup Time
Latch Hold Time
Latch to Output Delay
Shutdown Mode Input Stage Supply Current
Shutdown Mode Output Stage Supply Current
Shutdown Mode Total Supply Current
Shutdown Time
Shutdown Pin Voltage High
Shutdown Pin Voltage Low
Wake-Up Time from Shutdown
V
SHDN
= 0.8V
l
1.05
11.6
1.25
14.5
40
1.45
17.6
0.4
V
kΩ
mV
V
V
µA
µA
ns
ns
ns
1.7
31
–75
–59
2
–2
3
0.78
270
1.07
1.14
410
430
1.48
1.57
70
V
LE/HYST
= 1.7V
V
LE/HYST
= 0.4V
l
l
Shutdown Characteristics
mA
mA
μA
µA
mA
mA
ns
V
0.8
120
V
ns
V
SHDN
= 0.8V
l
V
SHDN
= 0.8V
l
1.05
110
l
Output Hi-Z
Part Guaranteed to be Powered On
Part Guaranteed to be Powered Off
V
OVERDRIVE
= 100mV, Output Valid
2
4
6754f
For more information
www.linear.com/LTC6754
LTC6754
The
l
denotes the specifications which apply
over the specified temperature range, otherwise specifications are at T
A
= 25°C,
LE/HYST, SHDN
pins floating,V
OVERDRIVE
= 50mV,
–IN = V
CM
= 300mV, +IN = –IN + V
OVERDRIVE
, 150mV step size, R
L
=100Ω , unless otherwise noted.
SYMBOL
V
CCI
– V
EE
V
CCO
– V
EE
V
CMR
V
OS
T
C
V
OS
V
HYST
C
IN
R
DM
R
CM
I
B
PARAMETER
Input Supply Voltage (Note 5)
Output Supply Voltage (Note 5)
Input Voltage Range (Note 7)
Input Offset Voltage (Note 6)
l
elecTrical characTerisTics
(V
CCI
= V
CCO
= 2.5V)
CONDITIONS
MIN
l
l
TYP
MAX
5.25
5.25
V
CCI
+ 0.1
UNITS
V
V
mV
mV
µV/ºC
mV
pF
kΩ
MΩ
µA
μA
µA
μA
μA
dB
dB
dB
dB
dB
dB
dB
2.4
2.4
–4.2
–7.5
±0.7
18
4.9
1.1
55
6.5
l
V
EE
– 0.2
4.2
7.5
Input Offset Voltage Drift
Input Hysteresis Voltage (Note 5)
Input Capacitance
Differential Mode Resistance
Common Mode Resistance
Input Bias Current
V
CM
= V
EE
+ 0.3V
LE/HYST
pin floating
l
l
–3.8
–4
–1.7
0.5
1.3
2.3
0.7
V
CM
= V
CCI
– 0.3V
l
I
OS
Input Offset Current
V
CM
= V
EE
– 0.2V to V
CCI
– 1.5V
l
l
–0.7
55
47
55
45.7
62
59.5
260
–15
1.18
–10
75
72
80
53
CMRR_LVCM Common Mode Rejection Ratio,
Low V
CM
Region
CMRR_FR
Common Mode Rejection Ratio (Measured at
Extreme Ends of V
CMR
)
PSRR
Power Supply Rejection Ratio
A
VOL
V
OD
ΔV
OD
V
OCM
ΔV
OCM
Open Loop Gain
Differential Output Voltage
Difference in V
OD
Between Complementary
Output States
Output Common Mode Voltage
V
CM
= V
EE
– 0.2V to V
CCI
+0.1V
l
V
CCI
= V
CCO
Varied from
2.45V to 5.25V
Hysteresis Removed (Note 10)
l
l
l
l
l
l
l
345
±5
1.25
±1.8
420
15
1.31
10
15.5
5
mV
mV
V
mV
mA
mA
mA
mA
mA
mA
mA
mA
ns
ns
ns
ps
ps
ns
ps
Mbps
Difference in V
OCM
Between Complementary
Output States
Short Circuit Current, through Either Output, both
I
SC_VEE
Outputs Connected to V
EE
I
SC_OUT_SHORT
Output Current, Complementary Outputs Shorted
Input Stage Supply Current, Device On
Comparator On,
I
VCCI
Input Section Supply Current
Output Stage Supply Current, Device On
Comparator On, Output Section Supply
I
VCCO
Current
Total Supply Current, Device On
Comparator On, Single Supply Pin Version,
I
VCC
t
R,
t
F
t
PD
Rise/Fall Time
Propagation Delay (Note 8)
20% to 80%
V
OVERDRIVE
= 50mV
2.2
l
10.4
l
12.5
l
2.65
2.9
11.5
11.7
14.15
14.6
2.9
3.0
0.8
2
l
t
SKEW_RISEFALL
Propagation Delay Skew, Rising to Falling Transition
t
SKEW_COMP
t
OD_DISP
t
CM_DISP
TR
Propagation Delay Skew, Q to
Q
Overdrive Dispersion
Common Mode Dispersion
Toggle Rate
Overdrive Varied from 10mV to 125mV
V
CM
Varied from V
EE
– 0.2V to V
CCI
+ 0.1V
V
IN
= 200mV
P–P
Sine Wave, 50% Output Swing
50
40
1.1
200
800
For more information
www.linear.com/LTC6754
5
6754f
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