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HT6030 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc

Part # HT6030
Description  312 Series of Decoders
Download  10 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT6030 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc

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312 Series of Decoders
6
December 13, 1999
Functional Description
Operation
The 312 series of decoders provide various com-
binations of address and data pins in different
packages. They are paired with 312series of
encoders. The decoders receive data transmit-
ted by the encoders and interpret the first N
bits of the code period as addresses and the last
12-N bits as data (where N is the address code
number). A signal on the DIN pin then acti-
vates the oscillator which in turn decodes the
incoming address and data. The decoders check
the received address twice continuously. If all
the received address codes match the contents
of the decoder¢s local address, the 12-N bits of
data are decoded to activate the output pins
and the VT pin is set high indicating a valid
transmission. That will last until the address
code is incorrect or no signal is received.
The output of the VT pin is high only when the
transmission is valid. Otherwise it is always low.
Output type
The data outputs follow the encoders during a
valid transmission and are then latched in
this state until the next valid transmission
occurs.
Flowchart
The oscillator is disabled in the standby state
and activated as long as a logic ²high² signal is
applied to the DIN pin. i.e., the DIN pin should
be kept ²low² if there is no signal input.
Ye s
Are
C ode i n ?
S t or e dat a
No
Ye s
No
No
No
Ye s
S t andby m ode
D i s abl e V T &
i gnor e t h e r e s t o f
th i s w o r d
Ye s
No
Ye s
Addr es s or
dat a er r o r ?
Lat c h / M om ent a r y
dat a t o o ut put &
ac t i v a t e V T
Addr es s bi t s
m a t c hed ?
Ma t c h
pr ev i ous l y s t o r e d
dat a ?
2 t i m e s
of c hec k i ng
c o m p l e t ed ?
Po w e r o n


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