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PDF MAX978 Data sheet ( Hoja de datos )
| Número de pieza | MAX978 | |
| Descripción | Low-Power Comparators | |
| Fabricantes | Maxim Integrated | |
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19-1299; Rev 3; 3/09
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
________________General Description
The MAX976/MAX978/MAX998 dual/quad/single, high-
speed, low-power comparators are optimized for
+3V/+5V single-supply applications. They achieve a
20ns propagation delay while consuming only 225µA
supply current per comparator. The MAX998 features a
low-power shutdown mode that places the output in a
high-impedance state and reduces supply current
to 1nA.
The MAX976/MAX978/MAX998 inputs have a common-
mode voltage range that extends 200mV below ground.
Their outputs are capable of rail-to-rail operation with-
out external pullup circuitry, making these devices ideal
for interface with CMOS/TTL logic. All inputs and out-
puts can tolerate a continuous short-circuit fault condi-
tion to either rail. The comparators’ internal hysteresis
ensures clean output switching, even with slow-moving
input signals.
For space-critical applications, the single MAX998 is
available in a 6-pin SOT23 package, the dual MAX976
is available in an 8-pin µMAX® package, and the quad
MAX978 is available in a 16-pin QSOP package.
________________________Applications
Battery-Powered Systems
Threshold Detectors/Discriminators
3V Systems
IR Receivers
Digital Line Receivers
___________Typical Operating Circuit
____________________________Features
♦ Single-Supply Operation Down to 2.7V
♦ 20ns Propagation Delay
♦ 225µA Supply Current
♦ 1nA Shutdown Supply Current
♦ Rail-to-Rail Outputs
♦ Ground-Sensing Inputs
♦ Internal Hysteresis Ensures Clean Switching
♦ Available in Space-Saving Packages
SOT23 (MAX998)
µMAX (MAX976)
QSOP (MAX978)
_______________Ordering Information
PART*
PIN-PACKAGE
SOT
TOP MARK
MAX976ESA
8 SO
—
MAX976EUA
8 µMAX
—
MAX978ESE
16 Narrow SO
—
MAX978EEE
16 QSOP
—
MAX998ESA
8 SO
—
MAX998EUT-T
6 SOT23
AAAO
*All devices are specified over the -40°C to +85°C temper-
ature range.
__________________Pin Configurations
VCC
RD
R1
VCC
VCC
0.1μF
VCC OUT
GND SHDN
VCC
R2
MAX998
TOP VIEW
OUT 1
MAX998 6 VCC
GND 2
5 SHDN
+-
IN+ 3
4 IN-
SOT23
IR RECEIVER
Pin Configurations continued at end of data sheet
µMAX a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
1 page  
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
______________________________Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0V, TA = +25°C, unless otherwise noted.)
SHDN
2V/div
SHUTDOWN DELAY TIME
MAX976 TOC16
VIN+ > VIN-
SHDN
2V/div
WAKE-UP FROM SHUTDOWN
MAX976 TOC17
VIN+ > VIN-
VOUT
2V/div
200ns/div
VOUT
2V/div
5μs/div
______________________________________________________________Pin Description
MAX976
SO/µMAX
1, 3
2, 4
5
6, 7
8
—
PIN
MAX978
MAX998
SO/QSOP SOT23-6
SO
1, 3, 5, 7
3
3
2, 4, 6, 8
4
2
9, 13
2
4
10, 11,
14, 15
1
6
12, 16
6
7
— — 1, 5
——
5
8
NAME
FUNCTION
IN_+
IN_-
GND
OUT_
VCC
N.C.
SHDN
Comparator Noninverting Input
Comparator Inverting Input
Ground
Comparator Output
Supply Voltage, +2.7V to +5.5V
No Connection. Not internally connected.
Shutdown Input. Drive low for shutdown mode. Drive high or con-
nect to VCC for normal operation.
__________________Detailed Description
The MAX976/MAX978/MAX998 dual/quad/single com-
parators operate from a single +2.7V to +5.5V supply.
They achieve a 20ns propagation delay while consum-
ing only 225µA of supply current per comparator. The
MAX998 features a low-power shutdown mode that
places the output in a high-impedance state and
reduces supply current to 1nA. Activate shutdown
mode by driving SHDN low.
The MAX976/MAX978/MAX998 comparator inputs have
a common-mode voltage range of -0.2V to (VCC - 1.2V).
Either input can be driven to the Absolute Maximum
Ratings limit without false output inversion, as long as
the other input is within the Common-Mode Voltage
Range. Their push/pull output structure is capable of
rail-to-rail operation without external pull-up circuitry,
making these devices ideal for interfacing with
CMOS/TTL logic. All inputs and outputs can tolerate a
continuous short-circuit fault condition to either supply.
The comparator’s internal hysteresis ensures clean out-
put switching, even with slow-moving input signals.
_______________________________________________________________________________________ 5
5 Page 
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
Revision History
REVISION
NUMBER
0
1
2
3
REVISION
DATE
10/97
1/98
1/07
3/09
DESCRIPTION
Initial release
Adding specs for MAX998
Adding input current ratings to Abs Max
Update Chip Information, Package Info, correct unit measurement in TOC 8, style
changes
PAGES
CHANGED
—
—
—
1, 3, 4, 8
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX978.PDF ] | |
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