Z86230 Datasheet, PDF(49/61 Page) Zilog, Inc. – ADVANCED VIOLENCE BLOCKING AND NTSC 21 XDS

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Z86230 Datasheet, PDF (49/61 Pages) Zilog, Inc. – ADVANCED VIOLENCE BLOCKING AND NTSC 21 XDS

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ELECTRICAL CHARACTERISTICS

8.5.3 Line 21 Input Parameters (at 1.0V p-p)

Line 21 must be in its proper position to the leading edge of the Vertical Sync sig-

nal.

TABLE 40. LINE 21 INPUT PARAMETERS

Parameter

Conditions

Code Amplitude 50 IRE*

Code Zero Level 5 IRE, +15 IRE relative to Back Porch

Start of Code

10.5 Â±0.5 Âµs (measure from the midpoint of the leading

edge of the composite video Hsync pulse to the

midpoint of the rising edge of the ï¬rst clock run-in

cycle.)

Start of the Data 3.972 ms, â0.00 Âµs, +0.30 Âµs (measure from the

midpoint of the falling edge of the most recent clock

run-in cycle to the midpoint of the rising edge of the

start bit.)

NOTE: *A relative unit of measure developed by the Institute of Radio Engineers (IRE).

One IRE equals 1/140th of the composite video signal's peak-to-peak voltage. IRE is

the former name of what is now known as the Institute of Electrical and Electronics

Engineers (IEEE).

PS000400-TVC0499

Z86230âPRELIMINARY

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