STV5345/H Просмотр технического описания (PDF) - STMicroelectronics
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STV5345/H Datasheet PDF : 25 Pages
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Figure 1 : F6, TTC, TTD Input Internal Connections
STV5345 - STV5345/H - STV5345/T
F6 9
character display clock input
to timing chain
TTC 7
TTD
6
C EXT
teletex t clock input
to data acquistion circuit
V
VI(p-p)
teletext data input
to data acquisition circuit
0
clamping pulses from timing circuit
from time 4µs to 8µs of each television
line to maintain correct D.C. level
following external A.C. coupling
50%
duty cycle
level
VP
VP
t
shaded regions equal in area
F6, TTC, TTD INPUT CIRCUITRY
INPUT WAVEFORM PARAMETERS
Figure 2 : Teletext Data Input Timing
t CY
144ns typ.
TTC
t DS
t DH
40ns min. 40ns min.
TTD
Data Stable
90%
10%
tr
80ns max.
90%
10%
tf
80ns max.
Data Stable
data may change
Data Stable : 1 if ≥ 2V , 0 if ≤ 0.8V
Figure 3 : Synchronization Timing
F1
TCS
SAND
0
4.67
1.5
8.5
All timings in µs
data may change
data may change
continuous internal 1MHz clock
Phase lock
Phase lock off
33.5
64
7/25
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