z86131 ZiLOG Semiconductor, z86131 Datasheet - Page 6

• Manufacturer Part Number: z86131
• Description: Ntsc Line 21 Decoder
• Manufacturer: ZiLOG Semiconductor

Z86129/130/131
NTSC Line 21 Decoder
AC AND TIMING CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
Nonstandard Video Signals must exhibit the characteristics
indicated in Table 5.
Horizontal Signal Input (preferably H Flyback and refer to
1 and 2 to use external XTAL or clock input for Z86130/131
only)
6
Parameter
Amplitude
Polarity
Bandwidth
Signal Type
Max Input R
DC Offset
Parameter
Sync Amplitude
Vertical Pulse Width
Vertical Pulse Tilt
H Timing
Vertical Sync Signal
Minimum Signal-to-Noise
Ratio to Composite Video
Parameter
Amplitude
Video Lock Mode
HIN Lock Mode
Conditions
1.0V p-p ±3 dB
Sync tips negative
600 kHz
Interlaced
470 ohms
Signal to be AC coupled with a minimum series capacitance of 0.1 µF
Conditions
200 mV minimum
3H ±0.5H
20 mV maximum
Phase Step (Head Switch) ±10 µs maximum
Fh Deviation (long term) ±0.5% maximum
Fh p-p Deviation (short term) ±0.3% maximum
The internal sync circuits lock to all 525 or 625 line signals having a vertical sync pulse
that meets the following conditions:
¥ It is at least 2H wide
¥ It starts at the proper 2H boundary for its Þeld
¥ If equalizing pulse serrations are present, they must be less than 0.125H in width.
The Z86129/130/131 functions down to a 25 dB signal-to-noise ratio (CCIR-weighted)
with one error per row or better at that level.
Input
Conditions
CMOS level signal where Low <= 0.2 V
Polarity
Frequency
Polarity
Frequency
Table 4. Composite Video Input
Table 6. Horizontal Signal Input
Table 5. Characteristics
Any
15,734.263 Hz ±3%
Any
Same as Display Horizontal Flyback Pulse (HFB) pulse
P R E L I M I N A R Y
CC
DS007200-TVX0199
ZiLOG