STV5342 Ver la hoja de datos (PDF) - STMicroelectronics

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STV5342

TELETEXT DECODER WITH 4 INTEGRATED PAGES

STMicroelectronics 

STV5342

ELECTRICAL CHARACTERISTICS (continued)

VDD = 5V, VSS = 0V, TA = - 20 to + 70oC

Symbol

Parameter

TIM ING

tLOW

tHIGH

tSU , DAT

tHD , DAT

tSU , sTO

tBUF

tHD , STA

tSU , STA

SERIAL BUS (referred to VIH = 3V, VIL = 1.5V) (see Fig. 6)

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

Figure 1 : F6, TTC, TTD Input Internal Connections

Min Typ Max Unit

4

-

4

-

250

-

170

-

4

-

4

-

4

-

4

-

-

µs

-

µs

-

ns

-

ns

-

µs

-

µs

-

µs

-

µs

F6 9

character display clock input

to timing chain

TTC 7

TTD

6

C EXT

teletext 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

Figure 2 : Teletext Data Input Timing

t CY

144ns typ.

TTC

t DS

t DH

40ns min. 40ns min.

TTD

Data Stable

INPUT WAVEFORM PARAMETERS

90%

10%

tr

80ns max.

90%

10%

tf

80ns max.

Data Stable

data may change

Data Stable : 1 if ≥ 2V , 0 if ≤ 0.8V

data may change

data may change

6/20

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