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MC14490DWR2G bảng dữ liệu(PDF) 6 Page - ON Semiconductor

tên linh kiện MC14490DWR2G
Giải thích chi tiết về linh kiện  Hex Contact Bounce Eliminator
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MC14490
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6
Figure 4. Typical “Form A” Contact Debounce Circuit
(Only One Debouncer Shown)
1/2 BIT
DELAY
OSCILLATOR
AND
TWO−PHASE
CLOCK GENERATOR
Cext
OSCout
OSCin
FORM A"
CONTACT
Ain
1
9
7
φ1
φ2
DATA
SHIFT
LOAD
4−BIT STATIC SHIFT REGISTER
φ1 φ2
φ1 φ2
15
Aout
+VDD
PULLUP RESISTOR
(INTERNAL)
OPERATING CHARACTERISTICS
The single most important characteristic of the MC14490
is that it works with a single signal lead as an input, making
it directly compatible with mechanical contacts (Form A
and B).
The circuit has a built−in pullup resistor on each input.
The worst case value of the pullup resistor (determined from
the Electrical Characteristics table) is used to calculate the
contact wetting current. If more contact current is required,
an external resistor may be connected between VDD and the
input.
Because of the built−in pullup resistors, the inputs cannot
be driven with a single standard CMOS gate when VDD is
below 5 V. At this voltage, the input should be driven with
paralleled standard gates or by the MC14049 or MC14050
buffers.
The clock input circuit (pin 7) has Schmitt trigger shaping
such that proper clocking will occur even with very slow
clock edges, eliminating any need for clock preshaping. In
addition, other MC14490 oscillator inputs can be driven
from a single oscillator output buffered by an MC14050 (see
Figure 5). Up to six MC14490s may be driven by a single
buffer.
The MC14490 is TTL compatible on both the inputs and
the outputs. When VDD is at 4.5 V, the buffered outputs can
sink 1.6 mA at 0.4 V. The inputs can be driven with TTL as
a result of the internal input pullup resistors.
Figure 5. Typical Single Oscillator Debounce System
FROM CONTACTS
MC14490
TO SYSTEM
LOGIC
OSCin
OSCout
Cext
1/6 MC14050
9
7
OSCin 7
9OSCout
NO CONNECTION
FROM
CONTACTS
TO SYSTEM
LOGIC
MC14490
NO CONNECTION
9OSCout
OSCin 7
FROM CONTACTS
MC14490
TO SYSTEM
LOGIC


Số phần tương tự - MC14490DWR2G

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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ON Semiconductor
MC14490DWR2G ONSEMI-MC14490DWR2G Datasheet
166Kb / 11P
   Hex Contact Bounce Eliminator
May, 2013 ??Rev. 10
More results

Mô tả tương tự - MC14490DWR2G

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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ON Semiconductor
MC14490 ONSEMI-MC14490 Datasheet
234Kb / 12P
   Hex Contact Bounce Eliminator
May, 2000 ??Rev. 4
MC14490 ONSEMI-MC14490_13 Datasheet
166Kb / 11P
   Hex Contact Bounce Eliminator
May, 2013 ??Rev. 10
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