STV5345 datasheet(7/25 Pages) STMICROELECTRONICS

Part #	STV5345

Description	TELETEXT DECODER WITH 8 INTEGRATED PAGES

PDF	25 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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7 / 25 page

character display clock input

to timing chain

teletex t clock input

to data acquistion circuit

teletext data input

to data acquisition circuit

clamping pulses from timing circuit

from time 4

µsto 8µs of each television

line to maintain correct D.C. level

following external A.C. coupling

F6, TTC, TTD INPUT CIRCUITRY

INPUT WAVEFORM PARAMETERS

shaded regions equal in area

50%

duty cycle

level

VI(p-p)

TTC

TTD

C EXT

Figure 1 : F6, TTC, TTD Input Internal Connections

144ns typ.

t CY

40ns min. 40ns min.

t DH

t DS

80ns max.

t r

t f

80ns max.

10%

90%

10%

Data Stable

data may change

TTC

TTD

Data Stable : 1 if

≥ 2V , 0 if ≤ 0.8V

Figure 2 : Teletext Data Input Timing

TCS

SAND

4.67

8.5

1.5

33.5

continuous internal 1MHz clock

Phase lock off

All timings in

µs

Phase lock

Figure 3 : Synchronization Timing

STV5345 - STV5345/H - STV5345/T

7/25

STV5345 Datasheet(PDF) 7 Page - STMicroelectronics

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