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參數(shù)資料
| 型號： | MC14490PG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ELIMINATOR BOUNCE HEX 16DIP |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 系列： | 4000 |
| 邏輯類型： | 觸點回彈消除器 |
| 電源電壓： | 3 V ~ 18 V |
| 位數(shù)： | 6 |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-DIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1125 (CN2011-ZH PDF) |
| 其它名稱： | MC14490PGOS |
MC14490
http://onsemi.com
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
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 builtin 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 builtin 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
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