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PDF EL5485CS Data sheet ( Hoja de datos )

Número de pieza EL5485CS
Descripción Quad 4ns High Speed Comparators
Fabricantes Elantec Semiconductor 
Logotipo Elantec Semiconductor Logotipo



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No Preview Available ! EL5485CS Hoja de datos, Descripción, Manual

EL5485C, EL5486C - Preliminary
Quad 4ns High Speed Comparators
Features
• 4ns typ. propagation delay
• 5V to 12V input supply
• +2.7V to +5V output supply
• True-to-ground input
• Rail-to-rail outputs
• Separate analog and digital
supplies
• Active low latch
• Single (EL5185C) available
• Dual (EL5285C) available
• Window available (EL5287C)
• Pin-compatible 8ns family
available (EL5x81C, EL5283C &
EL5482C)
Applications
• Threshold detection
• High speed sampling circuits
• High speed triggers
• Line receivers
• PWM circuits
• High speed V/F converters
Ordering Information
Part No
EL5485CS
EL5485CS-T7
EL5485CS-T13
EL5486CU
EL5486CU-T13
Package
16-Pin SO
16-Pin SO
16-Pin SO
24-Pin QSOP
24-Pin QSOP
Tape & Reel
-
7”
13”
-
13”
Outline #
MDP0027
MDP0027
MDP0027
MDP0040
MDP0040
General Description
The EL5485C and EL5486C comparators are designed for operation
in single supply and dual supply applications with 5V to 12V between
VS+ and VS-. For single supplies, the inputs can operate from 0.1V
below ground for use in ground sensing applications.
The output side of the comparators can be supplied from a single sup-
ply of 2.7V to 5V. The rail-to-rail output swing enables direct
connection of the comparator to both CMOS and TTL logic circuits.
The latch input of the EL5485C and EL5486C can be used to hold the
comparator output value by applying a low logic level to the pin.
The EL5485C is available in the 16-pin SO package and the EL5486C
in the 24-pin QSOP package. Both are specified for operation over the
full -40°C to +85°C temperature range. Also available are single
(EL5185C), dual (EL5285C), and window comparator (EL5287C)
versions.
Pin Configurations
INA- 1
INA+ 2
GND 3
+-
OUTA 4
OUTB 5
VS- 6
INB+ 7
+-
INB- 8
16 IND-
15 IND+
-+
14 VS+
13 OUTD
12 OUTC
11 VSD
-+
10 INC+
9 INC-
EL5485CS
(16-Pin SO)
INA- 1
INA+ 2
NC 3
GND 4
+-
LATCHA 5
OUTA 6
OUTB 7
LATCHB 8
VS- 9
NC 10
+-
INB+ 11
INB- 12
24 IND-
23 IND+
22 NC
-+
21 VS+
20 LATCHD
19 OUTD
18 OUTC
17 LATCHC
16 VSD
-+
15 NC
14 INC+
13 INC-
EL5486CU
(24-Pin QSOP)
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.

1 page




EL5485CS pdf
EL5485C, EL5486C - Preliminary
Quad 4ns High Speed Comparators
Typical Performance Curves
Propagation Delay vs Load Capacitance
VIN=1VSTEP
9
VS=±5V
8.5 VSD=5V
VOD=50mV
8 RL=2.2k
7.5 TPD-
7
6.5
TPD+
6
5.5
5
0 10 20 30 40 50 60 70 80 90 100
CLOAD (pF)
Output with 50MHz Input
VIN=1VP-P
Power Dissipation vs Ambient Temperature
1.4
1.2 1087mW
1
0.8 909mW
0.6
0.4
SO16
QSOP24 115°C/W
θJA =110°C/W
0.2
0
0
25
50
75 85 100
125
Ambient Temperature (°C)
150
Output with 50MHz Input
VIN=3VP-P
Output
(5ns/div,
2V/div)
Input
(5ns/div,
0.5nV/div)
Output
(5ns/div,
2V/div)
Input
(5ns/div,
2V/div)
5

5 Page





EL5485CS arduino
EL5485C, EL5486C - Preliminary
Quad 4ns High Speed Comparators
output changes state. The non-inverting and inverting
inputs may be reversed.
VIN
VREF
+
-
VOUT
back to the non-inverting input. The circuit will operate
with most AT-cut crystal from 1MHz to 8MHz over a
2V to 7V supply range. The output duty cycle for this
circuit is roughly 50% at 5V VCC, but it is affected by
the tolerances of the resistors. The duty cycle can be
adjusted by changing VCC value.
Crystal Oscillator
A simple crystal oscillator using one comparator of an
EL5485C and EL5486C is shown below. The resistors
R1 and R2 set the bias point at the comparator's non-
inverting input. Resistors R3, R4, and C1 set the invert-
ing input node at an appropriate DC average voltage
based on the output. The crystal's path provides resonant
positive feedback and stable oscillation occurs.
Although the EL5485C and EL5486C will give the cor-
rect logic output when an input is outside the common
mode range, additional delays may occur when it is so
operated. Therefore, the DC bias voltages at the inputs
are set about 500mV below the center of the common
mode range and the 200resistor attenuates the feed-
5V
R1 5k
R2 1.5k
C1
0.01µF
200
+
-
R4
2k
1MHz to
8MHz
R3
2k
VOUT
11

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