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Электронный компонент: HT682L

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3
18
Series of Decoders
Selection Table
Function Address
No.
Data
VT
Oscillator
Trigger
Package
Item
No.
Type
HT602L
12
2
L
RC oscillator DIN active "Hi" 20 DIP/20 SOP
HT604L
10
4
L
RC oscillator DIN active "Hi" 20 DIP/20 SOP
HT605L
9
5
L
RC oscillator DIN active "Hi" 20 DIP/20 SOP
HT611
14
0
--
RC oscillator DIN active "Hi" 20 DIP/20 SOP
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 3
18
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
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 18N 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.
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
1
2nd Oct '97
Function Address
No.
Data
VT
Oscillator
Trigger
Package
Item
No.
Type
HT612
12
2
M
RC oscillator DIN active "Hi" 20 DIP/20 SOP
HT614
10
4
M
RC oscillator DIN active "Hi" 20 DIP/20 SOP
HT615
9
5
M
RC oscillator DIN active "Hi" 20 DIP/20 SOP
HT644L
14
4
L
RC oscillator DIN active "Hi" 24 SOP/24 SDIP
HT646L
12
6
L
RC oscillator DIN active "Hi" 24 SOP/24 SDIP
HT648L
10
8
L
RC oscillator DIN active "Hi" 24 SOP/24 SDIP
HT651
18
0
--
RC oscillator DIN active "Hi" 24 SOP/24 SDIP
HT654
14
4
M
RC oscillator DIN active "Hi" 24 SOP/24 SDIP
HT656
12
6
M
RC oscillator DIN active "Hi" 24 SOP/24 SDIP
HT658
10
8
M
RC oscillator DIN active "Hi" 24 SOP/24 SDIP
HT682L
10
2
L
RC oscillator DIN active "Hi" 18 DIP
HT683L
9
3
L
RC oscillator DIN active "Hi" 18 DIP
HT684L
8
4
L
RC oscillator DIN active "Hi" 18 DIP
HT691
12
0
--
RC oscillator DIN active "Hi" 18 DIP
HT692
10
2
M
RC oscillator DIN active "Hi" 18 DIP
HT693
9
3
M
RC oscillator DIN active "Hi" 18 DIP
HT694
8
4
M
RC oscillator DIN active "Hi" 18 DIP
Note: Data type: M represents momentary type of data output.
L represents latch type of data output.
VT can be used as a momentary data output.
3
18
Series of Decoders
2
2nd Oct '97
Block Diagram
Note: The address/data pins are available in various combinations
(refer to the address/data table).
Pin Description
Pin Name
I/O
Internal
Connection
Description
A0~A17
I
TRANSMISSION
GATE
Input pins for address A0~A17 setting
They can be externally set to VDD, VSS, or left open.
D10~D17
O
CMOS OUT
Output data pins
DIN
I
CMOS IN
Serial data input pin
VT
O
CMOS OUT
Valid transmission, active high
OSC1
I
OSCILLATOR
Oscillator input pin
OSC2
O
OSCILLATOR
Oscillator output pin
VSS
I
--
Negative power supply (GND)
VDD
I
--
Positive power supply
3
18
Series of Decoders
3
2nd Oct '97
Approximate internal connection circuits
Absolute Maximum Ratings*
Supply Voltage ............................... 0.3V to 13V
Storage Temperature................. 50
C to 125
C
Input Voltage..................V
SS
0.3V to V
DD
+0.3V
Operating Temperature............... 20
C to 75
C
*Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent
damage to the device. These are stress ratings only. Functional operation of this device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied and exposure to absolute maximum rating conditions for extened
periods may affect device reliability.
Electrical Characteristics
(Ta=25
C)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
--
--
3
--
12
V
I
STB
Standby Current
5V
Oscillator stops
--
0.1
1
A
12V
--
2
4
A
I
DD
Operating Current
5V
No load
F
OSC
=100kHz
--
0.2
1
mA
I
O
Data Output Source Current
(D10~D17)
5V
V
OH
=4.5V
0.5
1
--
mA
Data Output Sink Current
(D10~D17)
V
OL
=0.5V
0.5
1
--
mA
I
VT
VT Output Source Current
5V
V
OH
=4.5V
2
4
--
mA
VT Output Sink Current
V
OL
=0.5V
1
2
--
mA
V
IH
"H" Input Voltage
5V
--
3.5
--
5
V
V
IL
"L" Input Voltage
5V
--
0
--
1
V
F
OSC
Oscillator Frequency
10V
R
OSC
=330k
--
100
--
kHz
3
18
Series of Decoders
4
2nd Oct '97
Functional Description
Operation
The 3
18
series of decoders provides various com-
binations of address and data pins in different
packages. It is paired with the 3
18
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
18N 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 18N 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.
3
18
Series of Decoders
5
2nd Oct '97