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PDF MAX9021AUK-T Data sheet ( Hoja de datos )
| Número de pieza | MAX9021AUK-T | |
| Descripción | Micropower / Ultra-Small / Single/Dual/Quad / Single-Supply Comparators | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1842; Rev 1; 7/01
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
General Description
The MAX9021/MAX9022/MAX9024 single/dual/quad
comparators are optimized for low-power consumption
while still providing a fast output response. They are
designed for single-supply applications from 2.5V to
5.5V, but can also operate from dual supplies. These
comparators have a 3µs propagation delay and con-
sume 2.8µA of supply current per comparator over the
-40°C to +125°C operating temperature range. The
combination of low-power, single-supply operation
down to 2.5V, and ultra-small footprint makes these
devices ideal for portable applications.
The MAX9021/MAX9022/MAX9024 have 4mV of built-in
hysteresis to provide noise immunity and prevent oscil-
lations even with a slow-moving input signal. The input
common-mode range extends from the negative supply
to within 1.1V of the positive supply. The design of the
comparator-output stage substantially reduces switch-
ing current during output transitions, eliminating power-
supply glitches.
The MAX9021 single comparator is available in tiny 5-
pin SC70 and SOT23 packages. The MAX9022 dual
comparator is available in 8-pin SOT23, µMAX, and SO
packages, and the MAX9024 quad comparator is avail-
able in 14-pin TSSOP and SO packages.
Applications
Battery-Powered
Portable Systems
Mobile Communications
Sensor-Signal Detection
Photodiode Preamps
Digital Line Receivers
Keyless Entry Systems
Threshold Detectors/
Discriminators
Features
o Low-Cost Solution Available in Space-Saving
SC70 Packages (Half the Size of SOT23)
o Low 2.8µA Supply Current
o 3µs Propagation Delay
o Internal 4mV Comparator Hysteresis
o Comparator Output Swings Rail-to-Rail®
o 2.5 to 5.5V Single-Supply Voltage Range
o No Phase Reversal for Overdriven Inputs
o Space-Saving Packages
5-Pin SC70 (MAX9021)
8-Pin SOT23 (MAX9022)
8-Pin µMAX (MAX9022)
14-Pin TSSOP (MAX9024)
Ordering Information
PART
MAX9021AXK-T
MAX9021AUK-T
MAX9022AKA-T
MAX9022AUA
MAX9022ASA
MAX9024AUD
MAX9024ASD
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
5 SC70-5
5 SOT23-5
8 SOT23-8
8 µMAX
8 SO
14 TSSOP
14 SO
Typical Application Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
IN+ 1
5 VDD
MAX9021
VSS 2
IN- 3
4 OUT
SC70/SOT23
OUTA 1
INA- 2
INA+ 3
VSS 4
MAX9022
8 VDD
7 OUTB
6 INB-
5 INB+
S0T23/µMAX/SO
OUTA 1
INA- 2
INA+ 3
VDD 4
INB+ 5
INB- 6
OUTB 7
MAX9024
14 OUTD
13 IND-
12 IND+
11 VSS
10 INC+
9 INC-
8 OUTC
TSSOP/SO
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
MAX9021
1
2
3
4
5
—
—
—
—
—
—
—
—
—
—
—
—
PIN
MAX9022
—
4
—
—
8
1
2
3
5
6
7
—
—
—
—
—
—
MAX9024
—
11
—
—
4
1
2
3
5
6
7
8
9
10
12
13
14
Pin Description
NAME
IN+
VSS
IN-
OUT
VDD
OUTA
INA-
INA+
INB+
INB-
OUTB
OUTC
INC-
INC+
IND+
IND-
OUTD
FUNCTION
Comparator Noninverting Input
Negative Supply Voltage
Comparator Inverting Input
Comparator Output
Positive Supply Voltage. Bypass with a 0.1µF capacitor to GND.
Comparator A Output
Comparator A Inverting Input
Comparator A Noninverting Input
Comparator B Noninverting Input
Comparator B Inverting Input
Comparator B Output
Comparator C Output
Comparator C Inverting Input
Comparator C Noninverting Input
Comparator D Noninverting Input
Comparator D Inverting Input
Comparator D Output
Detailed Description
The MAX9021/MAX9022/MAX9024 are single/dual/
quad, low-cost, low-power comparators that consume
only 2.8µA and provide a propagation delay, tPD, typi-
cally 3µs. They have an operating-supply voltage from
2.5V to 5.5V when operating from a single supply and
from ±1.25V to ±2.75V when operating from dual power
supplies. Their common-mode input voltage range
extends from the negative supply to within 1.1V of the
positive supply. Internal hysteresis ensures clean out-
put switching, even with slow-moving input signals.
Applications Information
Adding Hysteresis
Hysteresis extends the comparator’s noise margin by
increasing the upper threshold and decreasing the
lower threshold. A voltage-divider from the compara-
tor’s output sets the trip voltage. Therefore, the trip volt-
age is related to the output voltage.
These comparators have 4mV internal hysteresis.
Additional hysteresis can be generated with two resis-
tors, using positive feedback (Figure 1). Use the follow-
ing procedure to calculate resistor values:
1) Find the trip points of the comparator using these for-
mulas:
VTH = VREF + ((VDD - VREF)R2) / (R1 + R2)
VTL = VREF(1 - (R2 / (R1 + R2))
where VTH is the threshold voltage at which the com-
parator switches its output from high to low as VIN
rises above the trip point. VTL is the threshold volt-
age at which the comparator switches its output from
low to high as VIN drops below the trip point.
_______________________________________________________________________________________ 5
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| PDF Descargar | [ Datasheet MAX9021AUK-T.PDF ] | |
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