Document
LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference
FEATURES
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DESCRIPTIO
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Ultralow Quiescent Current: 8.5µA Max Wide Supply Range Single: 2V to 11V Dual: ± 1V to ± 5.5V Input Voltage Range Includes the Negative Supply Reference Output Drives 0.01µF 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.
U APPLICATIO S
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Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits
TYPICAL APPLICATIO
VIN 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
VREF
–
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
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Reference Settling
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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
U U W PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT B 1 OUT A 2 V+ 3 IN A– 4 IN A+ IN B– 5 6 16 OUT C 15 OUT D 14 GND 13 IN D+ 12 IN D–
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ORDER PART NUMBER LTC1443CN LTC1443CS LTC1443IN LTC1443IS
11 IN C V–
IN B+ 7 REF 8 N PACKAGE 16-LEAD PDIP
10 IN C– 9
S PACKAGE 16-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 90°C/ W (N) TJMAX = 150°C, θJA = 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 TA = 25°C. V+ = 5V, V – = GND = 0V, unless otherwise noted.
SYMBOL PARAMETER Power Supply V+ Supply Voltage Range ICC Supply Current Comparator VOS Comparator Input Offset Voltage IIN Input Leakage Current (IN+, IN –) Input Leakage Current (HYST) VCM Comparator Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio Noise Voltage Noise VHYST Hysteresis Input Voltage Range CONDITIONS
q
ELECTRICAL CHARACTERISTICS
IN+ = IN – = 80mV HYST = REF (LTC1444/LTC1445) VCM = 2.5V VIN+ = VIN– = 2.5V LTC1444/LTC1445 V – to (V+ – 1.3V) V+ = 2V to 11V 100Hz to 100kHz LTC1444, LTC1445
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W W
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(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+ IN B– IN B+ 5 6 7 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
REF 8 N PACKAGE 16-LEAD PDIP
S PACKAGE 16-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 90°C/ W (N) TJMAX = 150°C, θJA = 150°C/ W (S)
MIN 2.0
TYP
MAX 11.0 8.5
UNITS V µA
q
5.5
q q q q
± 3.0 ± 0.01 ± 0.02 V– 0.1 0.1 20
± 10.0 ± 1.0 ± 1.0 V+ – 1.3V 1.0 1.0 REF
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REF – 50mV
mV nA nA V mV/V mV/V µVRMS V
LTC1443/LTC1444/LTC1445
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V – = GND = 0V, unless otherwise n.