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HT648L Datasheet

  • HT648L

  • 318 Series of Decoders

  • 14頁

  • HOLTEK

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3
Features
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18
Series of Decoders
Trinary address setting
Two times of receiving check
Built-in oscillator needs only a 5% resistor
Valid transmission indictor
Easily interface with an RF or an infrared
transmission medium
Minimal external components
Operating voltage: 2.4V~12V
Low power and high noise immunity CMOS
technology
Low standby current
Capable of decoding 18 bits of information
Pairs with HOLTEK鈥檚 3
18
series of encoders
8~18 address pins
0~8 data pins
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Applications
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Burglar alarm system
Smoke and fire alarm system
Garage door controllers
Car door controllers
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Car alarm system
Security system
Cordless telephones
Other remote control systems
General Description
The 3
18
decoders are a series of CMOS LSIs for
remote control system applications. They are
paired with the 3
18
series of encoders. For
proper operation a pair of encoder/decoder pair
with the same number of address and data
format should be selected (refer to the en-
coder/decoder cross reference tables).
The 3
18
series of decoders receives serial ad-
dress and data from that series of encoders that
are transmitted by a carrier using an RF or an
IR transmission medium. It then compares the
serial input data twice continuously with its
local address. If no errors or unmatched codes
are encountered, the input data codes are de-
coded and then transferred to the output pins.
The VT pin also goes high to indicate a valid
transmission.
The 3
18
decoders are capable of decoding 18 bits
of information that consists of N bits of address
and 18鈥揘 bits of data. To meet various applica-
tions they are arranged to provide a number of
data pins whose range is from 0 to 8 and an
address pin whose range is from 8 to 18. In
addition, the 3
18
decoders provide various com-
binations of address/data number in different
packages.
Selection Table
Function Address
No.
Item
HT602L
HT604L
HT605L
HT611
12
10
9
14
Data
No.
2
4
5
0
VT
L
L
L
Oscillator
Trigger
Package
Type
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RC oscillator DIN active 鈥淗i鈥?20 DIP/20 SOP
RC oscillator DIN active 鈥淗i鈥?20 DIP/20 SOP
RC oscillator DIN active 鈥淗i鈥?20 DIP/20 SOP
RC oscillator DIN active 鈥淗i鈥?20 DIP/20 SOP
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1
2nd Oct 鈥?7

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