LTC1443/LTC1444/LTC1445
Ultralow Power Quad
Comparators with Reference
FEATURES
s
s
DESCRIPTIO
®
s
s
s
s
s
s
s
s
Ultralow Quiescent Current: 8.5
µ
A Max
Wide Supply Range
Single: 2V to 11V
Dual:
±1V
to
±5.5V
Input Voltage Range Includes the Negative Supply
Reference Output Drives 0.01
µ
F Capacitor
Adjustable Hysteresis (LTC1444/LTC1445)
TTL/CMOS Compatible Outputs
Propagation Delay: 12µs (Typ) (10mV Overdrive)
No Crowbar Current
40mA Continuous Source Current
Pin Compatible Upgrades for MAX924 (LTC1443)
The LTC 1443/LTC1444/LTC1445 are ultralow power quad
comparators with a built-in reference. The comparators
feature less than 8.5µA supply current over temperature,
an internal reference (1.182V
±1%
for LTC1443 or 1.221V
±1%
for LTC1444/LTC1445), programmable hysteresis
(LTC1444/LTC1445) and TTL/CMOS output (LTC1443/
LTC1445) that sinks and sources current (open-drain
output for LTC1444). The reference output can drive a
bypass capacitor of up to 0.01µF without oscillation.
The comparators operate from a single 2V to 11V supply
or a dual
±1V
to
±5.5V
supply (LTC1443). Comparator
hysteresis is easily programmable using two resistors and
the HYST pin (LTC1444/LTC1445). Each comparator’s
input operates from the negative supply to within 1.3V of
the positive supply. The LTC1443/LTC1445 comparator
output stage can continuously source up to 40mA. By
eliminating the cross-conducting current that normally
happens when the comparator changes logic states, power
supply glitches are eliminated.
The LTC1443/LTC1444/LTC1445 are available in the
16-pin SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Oscillator Circuits
TYPICAL APPLICATIO
V
IN
3.4M
1%
5V
TO 8V
Reference Settling Test Circuit
3
V
+
5 IN A
+
V
+
5V
2
4 IN A
–
8V
2mV/DIV
+
OUT
V
REF
–
LTC1445
V
–
9
OUT
2ms/DIV
LTC1443/1444/1445 • TA02
14 HYST
1.21M
1%
R1
10k
R2
2.4M
8 REF
R3
430Ω
C1
1.0µF
LTC1443/44/45 • TA01
U
Reference Settling
U
U
1
LTC1443/LTC1444/LTC1445
ABSOLUTE
AXI U
RATI GS
Voltage:
V
+
to V
–
, V
+
to GND, GND to V
–
...........12V to – 0.3V
IN
+
, IN
–
, HYST ................. (V
+
+ 0.3V) to (V
–
– 0.3V)
REF .................................. (V
+
+ 0.3V) to (V
–
– 0.3V)
OUT (LTC1443) ............. (V
+
+ 0.3V) to (GND – 0.3V)
OUT (LTC1444/LTC1445)
......................................... (V
+
+ 0.3V) to (V
–
– 0.3V)
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature Range (Soldering, 10 sec)....... 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
OUT B 1
OUT A 2
V
+
3
IN A
–
4
IN A
+
5
IN B
–
6
IN B
+
7
REF 8
N PACKAGE
16-LEAD PDIP
16 OUT C
15 OUT D
14 GND
13 IN D
+
12 IN D
–
11 IN C
+
10 IN C
–
9
V
–
ORDER PART
NUMBER
LTC1443CN
LTC1443CS
LTC1443IN
LTC1443IS
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 90°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 150°C/ W (S)
Consult factory for Military grade parts.
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 5V, V
–
= GND = 0V, unless otherwise noted.
SYMBOL PARAMETER
Power Supply
V
+
Supply Voltage Range
I
CC
Supply Current
Comparator
V
OS
Comparator Input Offset Voltage
I
IN
Input Leakage Current (IN
+
, IN
–
)
Input Leakage Current (HYST)
V
CM
Comparator Input Common Mode Range
CMRR
Common Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
Noise
Voltage Noise
V
HYST
Hysteresis Input Voltage Range
CONDITIONS
q
ELECTRICAL CHARACTERISTICS
IN
+
= IN
–
= 80mV
HYST = REF (LTC1444/LTC1445)
V
CM
= 2.5V
V
IN+
= V
IN–
= 2.5V
LTC1444/LTC1445
V
–
to (V
+
– 1.3V)
V
+
= 2V to 11V
100Hz to 100kHz
LTC1444, LTC1445
q
q
q
q
2
U
U
W
W W
U
W
(Note 1)
Current:
IN
+
, IN
–
, HYST .................................................. 20mA
REF ................................................................... 20mA
OUT .................................................................. 50mA
OUT Short Circuit Duration (V
+
≤
5.5V) ....... Continuous
Power Dissipation .............................................. 500mW
Operating Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ............................................ – 40°C to 85°C
TOP VIEW
OUT B 1
OUT A 2
V
+
3
IN A
–
4
IN A
+
5
IN B
–
6
IN B
+
7
REF 8
N PACKAGE
16-LEAD PDIP
16 OUT C
15 OUT D
14 HYST
13 IN D
+
12 IN D
–
11 IN C
+
10 IN C
–
9
V
–
ORDER PART
NUMBER
LTC1444CN
LTC1444CS
LTC1444IN
LTC1444IS
LTC1445CN
LTC1445CS
LTC1445IN
LTC1445IS
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 90°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 150°C/ W (S)
MIN
2.0
TYP
MAX
11.0
8.5
UNITS
V
µA
q
5.5
±3.0
±0.01
±0.02
V
–
0.1
0.1
20
±10.0
±1.0
±1.0
+
– 1.3V
V
1.0
1.0
REF
q
REF – 50mV
mV
nA
nA
V
mV/V
mV/V
µV
RMS
V
LTC1443/LTC1444/LTC1445
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 5V, V
–
= GND = 0V, unless otherwise noted.
SYMBOL PARAMETER
Propagation Delay
t
PD
V
OH
V
OL
Output High Voltage
Output Low Voltage
CONDITIONS
Overdrive = 10mV, C
OUT
= 100pF
Overdrive = 100mV, C
OUT
= 100pF
I
O
= – 15mA; LTC1443/LTC1445
I
O
= 1.8mA; LTC1443
I
O
= 1.8mA; LTC1444/LTC1445
No Load, LTC1443
No Load, LTC1444/
LTC1445
I
SOURCE
I
SINK
Noise
Reference Output Source Current
Reference Output Sink Current
Voltage Noise
∆V
REF
≤
1mV
∆V
REF
≤
2.5mV
∆V
REF
≤
5mV
100Hz to 100kHz
C Temp Range
I Temp Range
C Temp Range
I Temp Range
MIN
TYP
12
4
UNITS
µs
µs
V
GND + 0.4V
V
–
+ 0.4V
V
V
1.194
1.200
1.233
1.239
V
V
V
V
µA
µA
µA
µV
RMS
MAX
ELECTRICAL CHARACTERISTICS
q
q
q
q
q
q
q
q
q
V
+
– 0.4V
Reference
V
REF
Reference Voltage
1.170
1.164
1.209
1.203
100
10
10
1.182
1.221
200
15
15
100
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
+
= 3V, V
–
= GND = 0V, unless otherwise noted.
SYMBOL PARAMETER
Power Supply
V
+
Supply Voltage Range
I
CC
Supply Current
Comparator
V
OS
Comparator Input Offset Voltage
I
IN
Input Leakage Current (IN
+
, IN
–
)
Input Leakage Current (HYST)
V
CM
Comparator Input Common Mode Range
CMRR
Common Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
Noise
Voltage Noise
V
HYST
Hysteresis Input Voltage Range
t
PD
Propagation Delay
V
OH
V
OL
Output High Voltage
Output Low Voltage
CONDITIONS
q
MIN
2.0
TYP
MAX
11.0
8
±10.0
±1.0
±1.0
+
– 1.3V
V
1.0
1.0
UNITS
V
µA
IN
+
= IN
–
= 80mV, HYST = REF
V
CM
= 1.5V
V
IN+
= V
IN–
= 1.5V
LTC1444/LTC1445
V
–
to (V
+
–1.3V)
V
+
= 2V to 11V
100Hz to 100kHz
LTC1444/LTC1445
Overdrive = 10mV, C
OUT
= 100pF
Overdrive = 100mV, C
OUT
= 100pF
I
O
= – 10mA, LTC1443/LTC1445
I
O
= 0.8mA; LTC1443
I
O
= 0.8mA; LTC1444/LTC1445
No Load, LTC1443
No Load, LTC1444/
LTC1445
C Temp Range
I Temp Range
C Temp Range
I Temp Range
q
q
q
q
q
5
±3.0
±0.01
±0.02
V
–
0.1
0.1
100
q
REF – 50mV
14
5
q
q
q
q
q
q
q
q
q
V
+
– 0.4V
mV
nA
nA
V
mV/V
mV/V
µV
RMS
REF
V
µs
µs
V
GND + 0.4V
V
–
+ 0.4V
V
V
1.194
1.200
1.233
1.239
V
V
V
V
µA
µA
µA
µV
RMS
Reference
V
REF
Reference Voltage
I
SOURCE
I
SINK
Noise
Reference Output Source Current
Reference Output Sink Current
Noise Voltage
∆V
REF
≤
1mV
∆V
REF
≤
2.5mV
∆V
REF
≤
5mV
100Hz to 100kHz
1.170
1.164
1.209
1.203
60
10
10
1.182
1.221
120
15
15
100
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
3
LTC1443/LTC1444/LTC1445
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1444/LTC1445
Hysteresis Control
80
60
SUPPLY CURRENT (µA)
5.2
T
A
= 25°C
5.0
SUPPLY CURRENT (µA)
5.4
5.0
4.6
4.2
3.8
3.4
3.0
–60 –40 –20
40
IN
+
– IN
–
(mV)
20
0
–20
–40
–60
–80
0
10
30
V
REF
– V
HYST
(mV)
20
40
50
LTC1443/44/45 • TPC01
LTC1444/LTC1445 Reference
Voltage vs Temperature
1.224
V
+
= 5V
1.186
1.184
REFERENCE VOLTAGE (V)
REFERENCE VOLTAGE (V)
1.182
1.180
1.178
1.176
1.174
1.172
REFERENCE VOLTAGE (V)
1.220
1.216
1.212
1.208
–60 –40 –20
0 20 40 60 80 100 120
TEMPERATURE (°C)
LTC1443/44/45 • TPC04
LTC1443 Reference Output
Voltage vs Output Load Current
1.194
1.192
1.190
1.188
1.186
1.184
1.182
1.180
0
5
10
15 20 25 30 35
LOAD CURRENT (µA)
40
45
SINK
V
+
= 5V
V
–
= GND
T
A
= 25°C
REFERENCE OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE HIGH (V)
4.0
OUTPUT VOLTAGE HIGH (V)
LTC1443/44/45 • TPC07
4
U W
Supply Current vs Supply Voltage
5.8
Supply Current vs Temperature
IN
+
= (IN
–
+ 100mV)
V
–
= GND (LTC1443)
V
+
= 5V
V
–
= 0V
V
+
= 5V
V
–
= –5V
V
+
= 3V
V
–
= 0V
4.8
4.6
4.4
4.2
4.0
1.0
1.5
2.0
2.5
SUPPLY VOLTAGE (V)
3.0
0 20 40 60 80 100 120
TEMPERATURE (°C)
LTC1443/44/45 • TPC03
LTC1443/44/45 • TPC02
LTC1443 Reference Voltage
vs Temperature
1.184
V
+
= 5V
V
–
= GND
LTC1443 Reference Output
Voltage vs Output Load Current
V
+
= 5V
V
–
= GND
T
A
= 25°C
1.183
1.182
1.181
1.180
1.179
1.178
0 20 40 60 80 100 120 140
TEMPERATURE (°C)
LTC1443/44/45 • TPC05
SOURCE
1.170
–60 –40 –20
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (mA)
LTC1443/44/45 • TPC06
Comparator Output Voltage High
vs Load Current
5.0
T
A
= 25°C
V
+
= 5V
2.0
2.5
Comparator Output Voltage Low
vs Load Current
T
A
= 25°C
1.5
3.0
V
+
= 3V
2.0
V
+
= 2V
V
+
= 2V
V
+
= 3V
V
+
= 5V
1.0
0.5
1.0
0
10
20
30
40
LOAD CURRENT (mA)
50
60
0
0
10
50 60
20 30 40
LOAD CURRENT (mA)
70
80
LTC1443/44/45 • TPC08
LTC1443/44/45 • TPC09
LTC1443/LTC1444/LTC1445
TYPICAL PERFOR A CE CHARACTERISTICS
Comparator Response Time vs
Input Overdrive
OUTPUT VOLTAGE (V)
4
3
2
1
0
T
A
= 25°C
OUTPUT VOLTAGE (V)
5
100mV
50mV
10mV
20mV
SINK CURRENT (mA)
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
0
100
–1
0
2
4
6
RESPONSE TIME (µs)
8
10
LTC1443/44/45 • TPC10
Comparator Short-Circuit Source
Current vs Supply Voltage
160
140
10
12
SOURCE CURRENT (mA)
100
80
60
40
20
0
0
1
OUT CONNECTED TO
V
–
= GND = 0V
RESPONSE TIME (µs)
120
3
SUPPLY VOLTAGE (V)
Supply Current vs
Comparator Input Frequency
10000
10000
SUPPLY CURRENT (µA)
RESPONSE TIME (µs)
1000
100
10
C
OUT
= 5pF
1
1
10
100
1k
10k
INPUT FREQUENCY (Hz)
100k
U W
2
Comparator Response Time vs
Input Overdrives
5
4
3
2
1
0
T
A
= 25°C
100mV
50mV
20mV
10mV
200
180
160
140
120
100
80
60
40
20
Comparator Short-Circuit Sink
Current vs Supply Voltage
T
A
= 25°C
OUT CONNECTED TO V
+
100
0
–1
0
2
4 6 8 10 12 14 16 18
RESPONSE TIME (µs)
LTC1443/44/45 • TPC11
0
0
1
2
3 4 5 6 7 8
SUPPLY VOLTAGE (V)
9
10
LTC1443/44/45 • TPC12
Comparator Response Time vs
Load Capacitance
t
PHL
8
6
t
PLH
4
2
4
5
0
20
60
80
40
LOAD CAPACITANCE (nF)
100
LTC1443/44/45 • TPC13
LTC1443/44/45 • TPC14
Comparator Response Time at
Low Supply Voltage
1000
20mV OVERDRIVE
100
C
OUT
= 55pF
C
OUT
= 15pF
10
100mV OVERDRIVE
1
1
1.1
1.2
1.3
1.4
1.5
1.6
SUPPLY VOLTAGE (V)
LTC1443/44/45 • TPC16
LTC1329 • TPC15
5
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