November 1984

7

Philips Semiconductors

Product specification

Multistandard decoder

TDA4555

TDA4556

Identification part

Switching voltages for chrominance filters and crystals

at pin 28 (PAL)

at pin 27 (SECAM)

at pin 26 (NTSC 3,58 MHz)

at pin 25 (NTSC 4,43 MHz)

Control voltage OFF state

−−

0,5

V

Control voltage ON state

during scanning; colour OFF

−

2,45

−

V

colour ON

−

5,8

−

V

Output current

3mA

Voltage for forced switching ON

PAL

9

−−

V

SECAM

9

−−

V

NTSC 3,58 MHz

9

−−

V

NTSC 4,43 MHz

9

−−

V

Delay time for

restart of scanning

2 to 3 vertical periods

colour ON

2 to 3 vertical periods

colour OFF

0 to 1 vertical periods

SECAM identification (pin 23)

Input voltage for

horizontal identification (H)

−−

2V

vertical identification (V)

10

−−

V

combined (H) and (V) identification

−

6 (note 3)

−

V

Sequence of standard inquiry

PAL-SECAM-NTSC 3,58 MHz-NTSC 4,43 MHz

Reliable SECAM identification by PAL priority circuit

Scanning time for each standard

4 vertical periods

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT