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PDF MAX966ESA Data sheet ( Hoja de datos )
| Número de pieza | MAX966ESA | |
| Descripción | Single/Dual/Quad / Micropower / Ultra-Low-Voltage / Rail-to-Rail I/O Comparators | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1226; Rev 0; 4/97
Single/Dual/Quad, Micropower,
Ultra-Low-Voltage, Rail-to-Rail I/O Comparators
_______________General Description
The MAX965–MAX970 single/dual/quad micropower
comparators feature Rail-to-Rail® inputs and outputs, and
fully specified single-supply operation down to +1.6V.
These devices draw less than 5µA per comparator and
have open-drain outputs that can be pulled beyond VCC
to 6V (max) above ground. In addition, their rail-to-rail
input common-mode voltage range makes these com-
parators suitable for ultra-low-voltage operation.
A +1.6V to +5.5V single-supply operating voltage range
makes the MAX965 family of comparators ideal for 2-cell
battery-powered applications. The MAX965/MAX967/
MAX968/MAX969 offer programmable hysteresis and
an internal 1.235V ±1.5% reference. All devices are
available in either space-saving 8-pin µMAX or 16-pin
QSOP packages.
________________________Applications
2-Cell Battery-Powered/Portable Systems
Window Comparators
Threshold Detectors/Discriminators
Mobile Communications
Voltage-Level Translation
Ground/Supply-Sensing Applications
_____________________Selector Guide
____________________________Features
o Ultra-Low Single-Supply Operation down to +1.6V
o Rail-to-Rail Common-Mode Input Voltage Range
o 3µA Quiescent Supply Current per Comparator
o Open-Drain Outputs Swing Beyond VCC
o 1.235V ±1.5% Precision Internal Reference
(MAX965/967/968/969)
o 10µs Propagation Delay (50mV overdrive)
o Available in Space-Saving Packages:
8-Pin µMAX (MAX965–MAX968)
16-Pin QSOP (MAX969/MAX970)
______________Ordering Information
PART
MAX965ESA
MAX965EUA
MAX966ESA
MAX966EUA
MAX967ESA
MAX967EUA
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
Ordering Information continued on last page.
Pin Configurations appear at end of data sheet.
__________Typical Operating Circuit
MAX965
Yes
1
Yes
MAX966
No
2
No
MAX967
Yes
2
Yes
MAX968
Yes
2
Yes
MAX969
Yes
4
Yes
MAX970
No
4
No
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
VIN VCC
3 IN+
7
VCC
OUT 8
4 IN-
5 HYST
6 REF
1.235V
MAX965
GND
1
RPULL-UP
VOUT
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
Single/Dual/Quad, Micropower,
Ultra-Low-Voltage, Rail-to-Rail I/O Comparators
_____________________________Typical Operating Characteristics (continued)
(VCC = +3.0V, RPULL-UP = 100kΩ, VCM = 0V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT PER COMPARATOR
vs. OUTPUT TRANSITION FREQUENCY
4.0
3.8
3.6
3.4
3.2
3.0 VCC = 5.5V
2.8
2.6
2.4 VCC = 1.6V
2.2
2.0
0.01 0.1 1 10 100
OUTPUT TRANSITION FREQUENCY (kHz)
PROGRAMMED HYSTERESIS
vs. COMMON-MODE VOLTAGE
40
35
30
25
20
15
10
5 VCC = 5.0V
VHYST = 22mV (PROGRAMMED)
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
COMMON-MODE VOLTAGE (V)
REFERENCE VOLTAGE
vs. SOURCE CURRENT
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0
100 200 300 400 500 600 700
SOURCE CURRENT (µA)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
200
190
180
170
160
150
140
130
120
110
100
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
1.2345
REFERENCE VOLTAGE
vs. TEMPERATURE
1.2340
VCC = 5V
1.2335
1.2330
1.2325
VCC = 2V
VCC = 3V
1.2320
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
IN+
50mV/div
PROPAGATION DELAY (tPD+)
MAX965/70-TOC15
VCC = 3V
OUT
2V/div
2µs/div
INPUT BIAS CURRENT
vs. TEMPERATURE
4.0
3.5 VCC = 5.0V
3.0
2.5
2.0
1.5
1.0
VCC = 3.0V
0.5
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
1.239
1.237
1.235
1.233
1.231
1.229
1.227
1.225
1.223
1.0
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
1.8 2.6 3.4 4.2 5.0
VCC (V)
5.8
IN+
50mV/div
PROPAGATION DELAY (tPD-)
MAX965/70-TOC16b
VCC = 3V
OUT
2V/div
2µs/div
_______________________________________________________________________________________ 5
5 Page 
Single/Dual/Quad, Micropower,
Ultra-Low-Voltage, Rail-to-Rail I/O Comparators
3) Calculate R1: R1 = (R3 + R4) x (VHB / VCC). Putting
in the values for this example, R1 = (2.2MΩ + 10k) x
(50mV / 5.0V) = 22.1kΩ.
4) Choose the trip point for VIN rising. This is the
threshold voltage where the comparator output tran-
sitions from low to high as VIN rises above the trip
point. For this example, choose 3.0V.
5) Calculate R2 as follows:
R2 = 1
VTHR
VREF x
R1
−
1−
R1
1
R3 + R4
R2 = 1 = 14.76k
3.0V
1.2 x 22k
−
1
22k
−
1
2.2M + 10k
where VTHR is the rising-voltage trip threshold.
Choose a standard value of 15kΩ.
6) Verify trip voltages and hysteresis as follows:
VIN rising:
VTHR
=
VREF
x
R1
x
1
R1
+
1
R2
+
R3
1
+
R4
VIN falling:
VTHF
=
VTHR
−
R1 x
R3 +
VCC
R4
Hysteresis = VTHR − VTHF
IR Receiver
Figure 5 shows an application using the MAX965 as an
infrared receiver. The infrared photodiode creates a
current relative to the amount of infrared light present.
This current creates a voltage across R1. When this
voltage level crosses the reference voltage applied to
the inverting input, the output transitions. Optional R3
provides additional hysteresis for noise immunity.
2-Cell to TTL Logic-Level Shifter
Figure 6 shows an application using the MAX965
to convert a 2-cell voltage-level signal into a TTL-
compatible signal. The supply voltage for the compara-
tor comes from the 2-cell supply. The output is pulled
up to a 5V supply.
VCC
RD
R3
VCC
0.1µF
VCC
HYST
GND
VCC
RPULL-UP
OUT
REF MAX965
Figure 5. IR Receiver
where VTHR is the rising-voltage trip point, and VTHF
is the falling-voltage trip point.
Circuit Layout and Bypassing
Power-supply bypass capacitors are not needed if sup-
ply impedance is low, but 100nF bypass capacitors
should be used when supply impedance is high or
when supply leads are long. Minimize signal lead
lengths to reduce stray capacitance between the input
and output that might cause instability.
2 CELLS
INPUT
0.1µF
+5V
VCC
HYST
GND
REF
OUT
MAX965
Figure 6. 2-Cell to TTL Logic-Level Translator
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX966ESA.PDF ] | |
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