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PDF HT693 Data sheet ( Hoja de datos )
| Número de pieza | HT693 | |
| Descripción | 318 Series of Decoders | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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318 Series of Decoders
Features
• 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’s 318 series of encoders
• 8~18 address pins
• 0~8 data pins
• 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
Applications
• Burglar alarm system
• Smoke and fire alarm system
• Garage door controllers
• Car door controllers
• Car alarm system
• Security system
• Cordless telephones
• Other remote control systems
General Description
The 318 decoders are a series of CMOS LSIs for
remote control system applications. They are
paired with the 318 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 318 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 318 decoders are capable of decoding 18 bits
of information that consists of N bits of address
and 18–N 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 318 decoders provide various com-
binations of address/data number in different
packages.
Selection Table
Function Address
Item
No.
Data
No. Type
VT
Oscillator
Trigger
Package
HT602L
HT604L
HT605L
HT611
12 2 L √ RC oscillator DIN active “Hi” 20 DIP/20 SOP
10 4 L √ RC oscillator DIN active “Hi” 20 DIP/20 SOP
9 5 L √ RC oscillator DIN active “Hi” 20 DIP/20 SOP
14 0 — √ RC oscillator DIN active “Hi” 20 DIP/20 SOP
1 2nd Oct ’97
1 page  
318 Series of Decoders
Functional Description
Operation
The 318 series of decoders provides various com-
binations of address and data pins in different
packages. It is paired with the 318 series of
encoders. The decoders receive data transmit-
ted by the encoders and interpret the first N
bits of the code period as address and the last
18–N bits as data (where N is the address code
number). A signal on the DIN pin then activates
the oscillator which in turns decodes the incom-
ing address and data. The decoders will check
the received address twice continuously. If all
the received address codes match the contents
of the decoder’s local address, the 18–N bits of
data are decoded to activate the output pins,
and the VT pin is set high to indicate a valid
transmission. That will last until the address
code is incorrect or no signal has been received.
The output of the VT pin is high only when the
transmission is valid. Otherwise it is low al-
ways.
Output type
There are 2 types of output to select from:
• Momentary type
The data outputs follow the encoder during a
valid transmission and then reset.
• Latch type
The data outputs follow the encoder during a
valid transmission, and are then latched in
this state until the next valid transmission
occurs.
Flowchart
Note: The oscillator is disabled in the
standby state and activated as long as
a logic “high” signal is applied to the
DIN pin. i.e., the DIN should be kept
“low” if there is no signal input.
5 2nd Oct ’97
5 Page 
Momentary series
318 Series of Decoders
11 2nd Oct ’97
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet HT693.PDF ] | |
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