STV5342 datasheet(6/20 Pages) STMICROELECTRONICS

6 / 20 page

ELECTRICAL CHARACTERISTICS (continued)

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

Symbol

Parameter

Min

Typ

Max

Unit

TIMING

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

tLOW

Low Period Clock

µs

tHIGH

High Period Clock

µs

tSU , DAT

Data Set-up Time

250

tHD , DAT

Data Hold Time

170

tSU ,sTO

Stop Set-up Time from Clock High

µs

tBUF

Start Set-up Time Following a Stop

µs

tHD , STA

Start Hold Time

µs

tSU , STA

Start Set-up Time Following Clock Low to High Transition

µs

character display clock input

to timing chain

teletext 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

STV5342

6/20

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