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PDF LTC1444CN Data sheet ( Hoja de datos )
| Número de pieza | LTC1444CN | |
| Descripción | Ultralow Power Quad Comparators with Reference | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1443/LTC1444/LTC1445
Ultralow Power Quad
Comparators with Reference
FEATURES
s Ultralow Quiescent Current: 8.5µA Max
s Wide Supply Range
Single: 2V to 11V
Dual: ±1V to ±5.5V
s Input Voltage Range Includes the Negative Supply
s Reference Output Drives 0.01µF Capacitor
s Adjustable Hysteresis (LTC1444/LTC1445)
s TTL/CMOS Compatible Outputs
s Propagation Delay: 12µs (Typ) (10mV Overdrive)
s No Crowbar Current
s 40mA Continuous Source Current
s Pin Compatible Upgrades for MAX924 (LTC1443)
U
APPLICATIO S
s Battery-Powered System Monitoring
s Threshold Detectors
s Window Comparators
s Oscillator Circuits
DESCRIPTIO
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.
TYPICAL APPLICATIO
Reference Settling Test Circuit
VIN
3.4M
1%
1.21M
1%
5V
TO 8V
R1
10k
R2
2.4M
3
V+
5 IN A+ +
4 IN A– –
2
OUT
14 HYST
8 REF
LTC1445
R3
430Ω
C1
1.0µF
V–
9
LTC1443/44/45 • TA01
8V
V+
5V
VREF
OUT
Reference Settling
2ms/DIV
LTC1443/1444/1445 • TA02
1
1 page  
LTC1443/LTC1444/LTC1445
TYPICAL PERFOR A CE CHARACTERISTICS
Comparator Response Time vs
Input Overdrive
5
TA = 25°C
4
100mV
10mV
3
50mV
2
20mV
1
0
0
100
–1 0
24
68
RESPONSE TIME (µs)
10
LTC1443/44/45 • TPC10
Comparator Response Time vs
Input Overdrives
5
4 TA = 25°C
100mV 50mV
3 20mV
2 10mV
1
0
100
0
–1 0 2 4 6 8 10 12 14 16 18
RESPONSE TIME (µs)
LTC1443/44/45 • TPC11
Comparator Short-Circuit Sink
Current vs Supply Voltage
200
180 TA = 25°C
160
140 OUT CONNECTED TO V+
120
100
80
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10
SUPPLY VOLTAGE (V)
LTC1443/44/45 • TPC12
Comparator Short-Circuit Source
Current vs Supply Voltage
160
Comparator Response Time vs
Load Capacitance
12
140
120
100
OUT CONNECTED TO
V– = GND = 0V
80
60
10 tPHL
8
6 tPLH
40
4
20
0
0 1 2 3 45
SUPPLY VOLTAGE (V)
LTC1443/44/45 • TPC13
2
0 20 40 60 80 100
LOAD CAPACITANCE (nF)
LTC1443/44/45 • TPC14
Supply Current vs
Comparator Input Frequency
10000
Comparator Response Time at
Low Supply Voltage
10000
1000
100
10
1
1
COUT = 55pF
COUT = 15pF
COUT = 5pF
10 100 1k 10k
INPUT FREQUENCY (Hz)
100k
LTC1329 • TPC15
1000
100
20mV OVERDRIVE
10 100mV OVERDRIVE
1
1 1.1 1.2 1.3 1.4 1.5 1.6
SUPPLY VOLTAGE (V)
LTC1443/44/45 • TPC16
5
5 Page 
PACKAGE DESCRIPTIO
LTC1443/LTC1444/LTC1445
Dimensions in inches (millimeters) unless otherwise noted.
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
16 15 14 13 12 11 10 9
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
1 2 34 5 6 7 8
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.016 – 0.050
(0.406 – 1.270)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.014 – 0.019
(0.355 – 0.483)
TYP
0.050
(1.270)
BSC
S16 1098
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1444CN.PDF ] | |
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