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PDF LTC1540C Data sheet ( Hoja de datos )
| Número de pieza | LTC1540C | |
| Descripción | Nanopower Comparator with Reference | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1540
Nanopower Comparator
with Reference
FEATURES
s Ultralow Quiescent Current: 0.3µA Typ
s Reference Output Drives 0.01µF Capacitor
s Adjustable Hysteresis
s Wide Supply Range: 2V to 11V
s Input Voltage Range Includes the Negative Supply
s Reference Output Sources Up to 1mA
s TTL/CMOS Compatible Outputs
s 60µs Propagation Delay with 10mV Overdrive
s No Crowbar Current
s 40mA Continuous Source Current
s Pin Compatible with LTC1440, MAX921, MAX931
U
APPLICATIONS
s Battery-Powered System Monitoring
s Threshold Detectors
s Window Comparators
s Oscillator Circuits
TYPICAL APPLICATION
Nanopower 2.9V VCC Threshold Detector
3.3V
R1
4.32M
1%
R2
3M
1%
3 IN+
4 IN–
7
V + LTC1540
+
8
–
OUT
5 HYST
6 REF
V–
2
GND
1
1540 • TA01
DESCRIPTION
The LTC®1540 is an ultralow power, single comparator
with built-in reference. The comparator’s features
include less than 0.6µA supply current over the commer-
cial temperature range, a 1.182V ±2% reference, pro-
grammable hysteresis and TTL/CMOS outputs that sink
and source current. The reference output can drive a
bypass capacitor of up to 0.01µF without oscillation.
The comparator operates from a single 2V to 11V supply
or a dual ±1V to ±5.5V supply. Comparator hysteresis is
easily programmed by using two resistors and the HYST
pin. Each comparator’s input operates from the negative
supply to within 1.3V of the positive supply. The compara-
tor output stage can continuously source up to 40mA. By
eliminating the cross-conducting current that normally
occur when the comparator changes logic states, power
supply glitches are eliminated.
The LTC1540 is available in the 8-pin MSOP and SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1540 Supply Current vs Temperature
0.50
V+ = 5V
0.45 V– = GND = 0V
0.40
0.35
0.30
0.25
0.20
0.15
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1540 • TA02
1
1 page  
LTC1540
PIN FUNCTIONS
GND (Pin 1): Ground. Connect to V – for single supply
operation.
V – (Pin 2): Negative Supply. Potential should be more
negative than GND. Connect to ground for single supply
operation.
IN + (Pin 3): Noninverting Comparator Input. Input com-
mon mode range from V – to V + – 1.3V. Input current
typically 10pA at 25°C.
IN – (Pin 4): Inverting Comparator Input. Input common
mode range from V – to V + – 1.3V. Input current typically
10pA at 25°C.
HYST (Pin 5): Hysteresis Input. Connect to REF if not
used. Input voltage range is from VREF to VREF – 50mV.
REF (Pin 6): Reference Output. 1.182V with respect
to V –. Can source up to 1mA and sink 10µA at 25°C. Drive
0.01µF bypass capacitor without oscillation.
V + (Pin 7): Positive Supply operating voltage is from 2V
to 11V.
OUT (Pin 8): Comparator CMOS Output. Swings from
GND to V +. Output can source up to 40mA and sink 5mA.
1
GND
2 V–
3 IN+
4 IN–
LTC1540
+
–
OUT 8
V+ 7
REF 6
HYST 5
1540 • PD
APPLICATIONS INFORMATION
The LTC1540 is a nanopower comparator with a built-in
1.182V reference. Features include programmable hyster-
esis, wide supply voltage range (2V to 11V) and the ability
of the reference to drive up to a 0.01µF capacitor without
oscillation. The comparator’s CMOS outputs can source
up to 40mA while supply current glitches that normally
occur when switching logic states, have been eliminated.
Power Supplies
The comparator operates from a single 2V to 11V supply.
The LTC1540 includes a separate ground for the compara-
tor output stage, allowing a split supply ranging from ±1V
to ±5.5V. Connecting V – to GND will allow single supply
operation. If the comparator output is required to source
more than 1mA, or the supply source impedance is high,
V + should be bypassed with a 0.1µF capacitor.
Comparator Inputs
The comparator inputs can swing from the negative supply,
V –, to within 1.3V (max) of the positive supply V+. The
inputs can be forced 300mV below V– or above V+ without
damage and the typical input leakage current is only ±10pA.
Comparator Output
The comparator output swings between GND and V + to
assure TTL compatibility with a split supply. The output is
capable of sourcing up to 40mA and sinking up to 5mA
while still maintaining nanoampere quiescent currents.
The output stage does not generate crowbar switching
currents during transitions which helps minimize parasitic
feedback through the supply pins.
Voltage Reference
The internal bandgap reference has a voltage of 1.182V
referenced to V –. The reference accuracy is ±2.0% from
0°C to 70°C. It can source up to 1mA and sink up to 10µA
with a 5V supply. The reference can drive a bypass
capacitor of up to 0.01µF without oscillation and by
inserting a series resistor, capacitance values up to 10µF
can be used (Figure 1).
Figure 2 shows the resistor value required for different
capacitor values to achieve critical damping. Bypassing
the reference can help prevent false tripping of the com-
parators by preventing glitches on V + or reference load
transients from disturbing the reference output voltage.
5
5 Page 
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
LTC1540
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8 765
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)
1
0°– 8° TYP
0.053 – 0.069
(1.346 – 1.752)
2
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*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
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 0996
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 LTC1540C.PDF ] | |
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