LTC1440/LTC1441/LTC1442
Ultralow Power Single/Dual
Comparator with Reference
FEATURES DESCRIPTIO
Ultralow Quiescent Current: 2.1A Typ (LTC1440) The LTC 1440/LTC1441/LTC1442 are ultralow power
Reference Output Drives 0.01F Capacitor single and dual comparators with built-in references. The
Adjustable Hysteresis (LTC1440/LTC1442) comparators feature less than 3.7A supply current over
Wide Supply Range: temperature (LTC1440), a 1.182V 1% reference, pro-
Single: 2V to 11V grammable hysteresis (LTC1440/LTC1442) and TTL/CMOS
Dual: 1V to 5.5V outputs that sink and source current. The reference output
Input Voltage Range Includes the Negative Supply can drive a bypass capacitor of up to 0.01F without
TTL/CMOS Compatible Outputs oscillation.
12s Propagation Delay with 10mV Overdrive
The comparators operate from a single 2V to 11V supply
No Crowbar Current
or a dual 1V to 5.5V supply (LTC1440). Comparator
40mA Continuous Source Current
hysteresis is easily programmed by using two resistors
Pin Compatible Upgrades for MAX921/922/923
and the HYST pin (LTC1440/LTC1442). Each comparators
3mm x 3mm x 0.75mm DFN Package (LTC1440)
input operates from the negative supply to within 1.3V of
U
the positive supply. The comparator output stage can
APPLICATIO S
continuously source up to 40mA. By eliminating the
cross-conducting current that normally happens when the
Battery-Powered System Monitoring
comparator changes logic states, the power supply glitches
Threshold Detectors
are eliminated.
Window Comparators
Oscillator Circuits
The LTC1440 is available in 8-pin PDIP, SO, MSOP and
DFN packages. The LTC1441/LTC1442 are available in
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
8-pin PDIP and SO packages.
TYPICAL APPLICATIO
Micropower 2.9V V Threshold Detector
CC
LTC1440 Supply Current vs Temperature
3.3V
5.0
+
V = 5V
7 V = GND = 0V
4.5
R1
+
1.65M
V
1%
+ 4.0
3 IN
+
8
R2 3.5
OUT
1.13M
4 IN
1%
3.0
2.5
5 HYST
2.0
LTC1440
6 REF
1.5
40 20 0 20 40 60 80 100
TEMPERATURE (C)
V GND
1440/1/2 TA02
21
1440 TA01
144012fd
1
SUPPLY CURRENT (A)
U
ULTC1440/LTC1441/LTC1442
ABSOLUTE MAXIMUM RATINGS
(Note 1)
+
Voltage
OUT Short-Circuit Duration (V 5.5V) .......Continuous
+ +
V to V , V to GND, GND to V ...........12V to 0.3V
Power Dissipation.............................................. 500mW
+ +
IN , IN , HYST ................. (V + 0.3V) to (V 0.3V)
Operating Temperature Range
+
REF ................................... (V + 0.3V) to (V 0.3V)
LTC144XC ............................................... 0C to 70C
+
OUT (LTC1440) .............. (V + 0.3V) to (GND 0.3V)
LTC144XI ........................................... 40C to 85C
+
OUT (LTC1441/LTC1442) ... (V + 0.3V) to (V 0.3V)
Storage Temperature Range ................. 65C to 150C
Current
Storage Temperature Range
+
IN , IN , HYST ................................................. 20mA
(DD Package) ................................... 65C to 125C
REF ................................................................... 20mA
Junction Temperature........................................... 150C
OUT .................................................................. 50mA
Junction Temperature (DD Package) .................... 125C
Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
GND 1 8 OUT
TOP VIEW
GND 1 8 OUT
+
V 2 7 V
+ GND 1 8 OUT
V 2 V
7
+
+
V 2 7 V
IN REF
3 6
+ +
IN 3 6 REF IN 3 6 REF
IN HYST
4 5
IN 4 5 HYST
IN 4 5 HYST
MS8 PACKAGE
DD PACKAGE 8-LEAD PLASTIC MSOP
N8 PACKAGE S8 PACKAGE
8-LEAD (3mm 3mm) PLASTIC DFN
8-LEAD PDIP 8-LEAD PLASTIC SO
T = 150C, = 250C/ W
JMAX JA
T = 125C, = 160C/ W (DD) T = 150C, = 130C/ W (N8)
JMAX JA JMAX JA
UNDERSIDE METAL CONNECTED TO V T = 150C, = 175C/ W (S8)
JMAX JA
(PCB CONNECTION OPTIONAL)
DD8 PART S8 PART
ORDER PART ORDER PART MS8 PART
ORDER PART
MARKING
NUMBER MARKING* NUMBER MARKING*
NUMBER
LTC1440CMS8
LTC1440CDD LBTH LTC1440CN8 1440 LTBX
LTC1440IMS8
LTC1440IDD LTC1440CS8 1440
LTC1440IN8 1440I
LTC1440IS8 1440I
ORDER PART
ORDER PART
TOP VIEW TOP VIEW
NUMBER NUMBER
OUT A 1 8 OUT B OUT A 1 8 OUT B
LTC1441CN8 LTC1442CN8
+
+
V 2 V
V 2 7 V 7
LTC1441CS8 LTC1442CS8
+
+ +
IN A 3 6 REF
IN A 3 6 IN B
LTC1441IN8 LTC1442IN8
IN A 4 IN B IN B 4 5 HYST
5 LTC1441IS8 LTC1442IS8
S8 PART
S8 PART
N8 PACKAGE S8 PACKAGE
N8 PACKAGE S8 PACKAGE
8-LEAD PDIP 8-LEAD PLASTIC SO
8-LEAD PDIP 8-LEAD PLASTIC SO
MARKING
MARKING
T = 150C, = 130C/ W (N8)
T = 150C, = 130C/ W (N8)
JMAX JA JMAX JA
T = 150C, = 175C/ W (S8) 1441 1442
T = 150C, = 175C/ W (S8)
JMAX JA JMAX JA
1441I 1442I
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: