LTC1440 LINER [Linear Technology], LTC1440 Datasheet

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LTC1440

Manufacturer Part Number
LTC1440
Description
Ultralow Power Single/Dual Comparator with Reference
Manufacturer
LINER [Linear Technology]
Datasheet

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APPLICATIONS
FEATURES
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
Ultralow Quiescent Current: 2.1 A Typ (LTC1440)
Wide Supply Range:
Input Voltage Range Includes the Negative Supply
Reference Output Drives 0.01 F Capacitor
Adjustable Hysteresis (LTC1440/LTC1442)
TTL/CMOS Compatible Outputs
12 s Propagation Delay with 10mV Overdrive
No Crowbar Current
40mA Continuous Source Current
Pin Compatible Upgrades for MAX921/922/923
Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Oscillator Circuits
Single: 2V to 11V
Dual: 1V to 5.5V
Micropower 2.9V V
R1
1.65M
1%
R2
1.13M
1%
APPLICATION
U
3
4
5
6
IN
IN
HYST
REF
+
V
2
CC
+
3.3V
Threshold Detector
V
+
LTC1440
7
GND
U
1
1440 TA01
8
OUT
Comparator with Reference
Ultralow Power Single/Dual
DESCRIPTION
The LTC
single and dual comparators with built-in references. The
comparators feature less than 3.7 A supply current over
temperature (LTC1440), a 1.182V 1% reference, pro-
grammable hysteresis (LTC1440/LTC1442) and TTL/CMOS
outputs that sink and source current. The reference output
can drive a bypass capacitor of up to 0.01 F without
oscillation.
The comparators operate from a single 2V to 11V supply
or a dual 1V to 5.5V supply (LTC1440). Comparator
hysteresis is easily programmed by using two resistors
and the HYST pin (LTC1440/LTC1442). Each comparator’s
input operates from the negative supply to within 1.3V of
the positive supply. The comparator output stage can
continuously source up to 40mA. By eliminating the
cross-conducting current that normally happens when the
comparator changes logic states, the power supply glitches
are eliminated.
The LTC1440 is available in 8-pin PDIP, SO and MSOP
packages. The LTC1441/LTC1442 are available in 8-pin
PDIP and SO packages.
LTC1440/LTC1441/LTC1442
®
1440/LTC1441/LTC1442 are ultralow power
LTC1440 Supply Current vs Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
–40
V
V
+
–20
= 5V
= GND = 0V
U
0
TEMPERATURE ( C)
20
40
60
1440/1/2 TA02
80
100
1

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LTC1440 Summary of contents

Page 1

... The comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated. The LTC1440 is available in 8-pin PDIP, SO and MSOP packages. The LTC1441/LTC1442 are available in 8-pin PDIP and SO packages. 8 OUT ...

Page 2

... S8 PART MARKING 8-LEAD PDIP 1441 T = 150 C, JMAX T = 150 C, 1441I JMAX + – 5V GND = 0V, T CONDITIONS + – 80mV HYST = REF (LTC1440/LTC1442) + 5.5V) ...... Continuous ORDER PART NUMBER TOP VIEW LTC1440CMS8 8 OUT + REF 5 HYST MS8 PACKAGE MS8 PART MARKING = 150 C, = 250 LTBX ...

Page 3

... C = 100pF Overdrive = 10mV OUT Overdrive = 100mV I = – 13mA 1.8mA LTC1440 O LTC1441/LTC1442 No Load C Temp Range LTC1440/LTC1442 I Temp Range No Load LTC1440 (MSOP) C Temp Range V 1mV (LTC1442) REF V 2.5mV (LTC1442) REF 0 I 2mA (LTC1440) SOURCE (LTC1440) SINK 100Hz to 100kHz + – ...

Page 4

... SUPPLY VOLTAGE (V) 1440/1/2 G04 4 + – 3V GND = 0V, T CONDITIONS No Load C Temp Range LTC1440/LTC1442 I Temp Range No Load LTC1440 (MSOP) C Temp Range V 1mV (LTC1442) REF V 2.5mV (LTC1442) REF 0 I 1mA (LTC1440) SOURCE (LTC1440) SINK 100Hz to 100kHz Comparator Response Time vs Input Overdrives ...

Page 5

... G10 1.186 = 2V CC 1.184 1.182 1.180 1.178 1.176 1.174 1.172 1.170 1440/1/2 G12 LTC1440/LTC1442 Hysteresis Control 80 60 OUTPUT HIGH OUTPUT LOW –20 –40 –60 – – V (mV) REF HYST 1440/1/2 G08 ...

Page 6

... – REF – HYST LTC1440 GND (Pin 1): Ground. Connect to V operation. – V (Pin 2): Negative Supply. Connect to ground for single supply operation. Potential should be more negative than GND (Pin 3): Noninverting Comparator Input. Input com- – + mon mode range from typically 10pA ...

Page 7

... Power Supplies The comparator family operates from a single 2V to 11V supply. The LTC1440 includes a separate ground for the comparator output stage, allowing a split supply ranging – from 1V to 5.5V. Connecting V to GND on the LTC1440 will allow single supply operation ...

Page 8

... LTC1440 GND 1 1440/1/2 F03a Level Detector The LTC1440 is ideal for use as a micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from V and R4 set the hysteresis voltage, and R5 and C1 bypass the reference output. The following design procedure can be used to select the component values: 1 ...

Page 9

... Low Battery Detect Operates Down to 1.5V 7 2-CELL + V 2.6M NiCd + – – 6 REF 20k 5 HYST GND 1. 182 LTC1440 8 OUT + V – V 1440 TA06 2 9 ...

Page 10

... LTC1440/LTC1441/LTC1442 U TYPICAL APPLICATIONS 100k ® LT 1034 1.2V + 365k* 1/2 LTC1441 2N3809 – 1N914 0.033 F POLYSTYRENE 150k 10M *TRW-IRC MRT–5/+120ppm 10-Bit 30 A A/D Converter 32.768kHz 1M 5V 470k + C2 1/2 LTC1441 – 1.2M 10pF C1 VN2222LL Q Q 74C74 74C00 D CLK CONV COMMAND 32.768kHz “Watch Crystal” Oscillator 32 ...

Page 11

... 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. LTC1440/LTC1441/LTC1442 U Dimensions in inches (millimeters) unless otherwise noted. ...

Page 12

... LTC1440/LTC1441/LTC1442 U TYPICAL APPLICATION 10kHz TRIM 200k 1.2M* INPUT 0.01 F 100k = HP5082-2810 = 1N4148 Q5 = 2N2222 = 1% METAL FILM * = POLYSTYRENE ** Q6 RELATED PARTS PART NUMBER DESCRIPTION LT1178/LT1179 Dual/Quad 17 A Precision Single Supply Op Amps LT1351 Single 250 A, 3MHz, 200V Amp with Shutdown LT1352/LT1353 Dual/Quad 250 A, 3MHz, 200V Amps ...

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