HT604L/614/692
3
18
Series of Decoders
1
April 24, 2000
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 Holteks 3
18
series of encoders
9~10 address pins
2~8 data pins
Trinary address setting
Two times of receiving check
Built-in oscillator needs only a 5% resistor
Valid transmission indicator
Easy interface with an RF or an infrared
transmission medium
Minimal external components
Package information: refer to Selection
Table
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 for-
mat should be selected (refer to the encoder/de-
coder cross reference tables).
The 3
18
series of decoders receive serial address
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 se-
rial input data twice continuously with its local
address. If no errors or unmatched codes are
encountered, the input data codes are decoded
and then transferred to the output pins. The VT
pin also goes high to indicate a valid transmis-
sion.
The 3
18
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 ad-
dress pin whose range is from 8 to 18. In addi-
tion, the 3
18
decoders provide various
combinations of address/data number in differ-
ent 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
Selection Table
Function Address
No.
Data
VT
Oscillator
Trigger
Package
Part No.
No. Type
HT604L
10
4
L
RC oscillator DIN active Hi 20 DIP/SOP
HT614
10
4
M
RC oscillator DIN active Hi 20 DIP/SOP
HT692
10
2
M
RC oscillator DIN active Hi 18 DIP
Note: Data type: M stands for momentary type data output.
L stands for latch type data output.
VT can be used as a momentary data output.
Block Diagram
Note: The address/data pins are available in various combinations (refer to the address/data table).
HT604L/614/692
2
April 24, 2000
D a t a S h i f t
R e g i s t e r
O s c i l l a t o r
B u f f e r
S y n c . D e t e c t o r
D i v i d e r
C o m p a r a t o r
C o m p a r a t o r
B u f f e r
T r a n s m i s s i o n G a t e C i r c u i t
D a t a D e t e c t o r
C o n t r o l L o g i c
O S C 1
O S C 2
D I N
V D D
V S S
V T
D a t a
L a t c h C i r c u i t
A d d r e s s
Pin Assignment
Latch series
Momentary series
Pin Description
Pin Name I/O
Internal
Connection
Description
A0~A12
I
TRANSMISSION
GATE
Input pins for address A0~A12 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
Negative power supply, ground
VDD
Positive power supply
Approximate internal connections
HT604L/614/692
3
April 24, 2000
1 0 - A d d r e s s
4 - D a t a
H T 6 1 4
2 0 D I P / S O P
A 1 1
D 1 2
D 1 3
D 1 4
D 1 5
V T
D I N
O S C 2
O S C 1
V S S
1
2
3
4
5
6
7
8
9
1 0
V D D
A 9
A 8
A 7
A 6
A 4
A 3
A 2
A 1
A 0
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
H T 6 9 2
1 8 D I P
1 0 - A d d r e s s
2 - D a t a
A 1 1
A 1 2
D 1 4
D 1 5
V T
D I N
O S C 2
O S C 1
V S S
1
2
3
4
5
6
7
8
9
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
1 0
V D D
A 9
A 8
A 7
A 6
A 3
A 2
A 1
A 0
H T 6 0 4 L
2 0 D I P / S O P
1 0 - A d d r e s s
4 - D a t a
A 1 1
D 1 2
D 1 3
D 1 4
D 1 5
V T
D I N
O S C 2
O S C 1
V S S
1
2
3
4
5
6
7
8
9
1 0
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
V D D
A 9
A 8
A 7
A 6
A 4
A 3
A 2
A 1
A 0
T R A N S M I S S I O N
G A T E
C M O S O U T
O S C I L L A T O R
O S C 1
O S C 2
C M O S I N
E N
Absolute Maximum Ratings
Supply Voltage...............................-0.3V to 13V
Storage Temperature.................-50C to 125C
Input Voltage.................V
SS
-0.3V to V
DD
+0.3V
Operating Temperature ..............-20C to 75C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maxi-
mum Ratings may cause substantial damage to the device. Functional operation of this de-
vice at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
Electrical Characteristics
Ta=25C
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
mA
12V
2
4
mA
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
=330kW
100
kHz
HT604L/614/692
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April 24, 2000
HT604L/614/692
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April 24, 2000
Functional Description
Operation
The 3
18
series of decoders provide 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
18-N bits as data (where N is the address code
number). A signal on the DIN pin then acti-
vates the oscillator which in turns decodes the
incoming address and data. The decoders will
check the received address twice continuously.
If all the received address codes match the con-
tents of the decoders 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 ad-
dress code is incorrect or no signal has been re-
ceived. The output of the VT pin is high only
when the transmission is valid. Otherwise it is
always low.
Output type
There are two 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.
Y e s
C o d e i n ?
S t o r e d a t a
N o
Y e s
N o
N o
N o
Y e s
S t a n d b y m o d e
D i s a b l e V T &
i g n o r e t h e r e s t o f
t h i s w o r d
Y e s
N o
Y e s
A d d r e s s o r
d a t a e r r o r ?
L a t c h / M o m e n t a r y
d a t a t o o u t p u t &
a c t i v a t e V T
A d d r e s s b i t s
m a t c h e d ?
M a t c h
p r e v i o u s s t o r e d
d a t a ?
2 t i m e s
o f c h e c k i n g
c o m p l e t e d ?
P o w e r o n
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