STV5342 STMICROELECTRONICS [STMicroelectronics], STV5342 Datasheet - Page 6

• Manufacturer Part Number: STV5342
• Description: TELETEXT DECODER WITH 4 INTERGATED PAGES
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STV5342
ELECTRICAL CHARACTERISTICS (continued)
TIMING
Figure 2 : Teletext Data Input Timing
6/20
Figure 1 : F6, TTC, TTD Input Internal Connections
V
Data Stable : 1 if
TTD
DD
Symbol
t
t
t
t
t
TTC
TTD
SU
SU , DAT
HD , DAT
HD , STA
SU , STA
t
t
t
HIGH
LOW
BUF
= 5V, V
, s
C
TTC
TO
F6
EXT
9
7
6
SS
SERIAL BUS (referred to V
Low Period Clock
High Period Clock
Data Set-up Time
Data Hold Time
Stop Set-up Time from Clock High
Start Set-up Time Following a Stop
Start Hold Time
Start Set-up Time Following Clock Low to High Transition
= 0V, T
data may change
F6, TTC, TTD INPUT CIRCUITRY
2V , 0 if 0.8V
144ns typ.
A
= - 20 to + 70
t
CY
40ns min. 40ns min.
clamping pulses from timing circuit
from time 4 s to 8 s of each television
line to maintain correct D.C. level
following external A.C. coupling
teletext clock input
to data acquistion circuit
teletext data input
to data acquisition circuit
character display clock input
to timing chain
t
DS
Data Stable
IH
Parameter
o
C
= 3V, V
t
DH
IL
data may change
= 1.5V) (see Fig. 6)
10%
Data Stable
V
80ns max.
I(p-p)
90%
t
V
0
r
INPUT WAVEFORM PARAMETERS
data may change
Min
shaded regions equal in area
250
170
4
4
4
4
4
4
80ns max.
duty cycle
level
50%
90%
t
Typ
f
-
-
-
-
-
-
-
-
10%
V
Max
P
-
-
-
-
-
-
-
-
V
P
Unit
ns
ns
s
s
s
s
s
s
t