參數(shù)資料
型號(hào)： Z86228
廠商： ZiLOG, Inc.
英文描述： LINE 21 CLOSED CAPTION CONTROLLER (L21C)
中文描述： 第21行閉合字幕控制器（L21C）
文件頁(yè)數(shù)： 4/7頁(yè)
文件大小： 87K
代理商： Z86228
4
Z86228
CPS DC-4243-00
P R E L I M I N A R Y
AC AND TIMING CHARACTERISTICS*
(Reference Line 21 AC/DC Timing)
Composite Video Input
Amplitude:
Polarity:
Bandwidth
1.0 V p-p,
±
3 dB
Sync tips negative
600 kHz
Horizontal Signal Input (preferably H Flyback)
Amplitude:
Polarity:
Frequency:
CMOS level signal, Low
≤
0.2V
CC
, High
≥
0.7V
CC
Any
15,734.263 Hz,
±
3%
Line 21
1
Input Parameters (at 1.0 V p-p)
Code Level:
Clock Run-in Start
2
:
50 IRE
±
10 IRE
10.5
μ
s,
±
0.5
μ
s
Input Signal-to-Random Noise Performance
Unit will function down to a 25 dB ratio (CCIR weighted) with one error per row or better at that level.
Internal Sync Circuits
The internal sync circuits will lock to all 525 line signals having a vertical sync pulse that meets the following conditions:
I
It is at least 2.5H long.
I
It starts at the proper 2H boundary for its field.
I
If equalizing pulse serrations are present they must be less than 0.125H in width.
Timing Signals
Dot Clock:
Dot Period:
Character Cell Width:
Width of Row (Box):
Width of Row (Char):
768 x FH = 12.0839 MHz
82.75 nsec
1.324
μ
sec
45.018
μ
sec
42.370
μ
sec
*All values are nominal and not fully characterized.
DC CHARACTERISTICS
T
A
= 0
°
C to +70
°
C; V
CC
= +4.75V to +5.25V
Sym
Parameter
Min
Max
Units
Conditions
V
IL
V
IH
V
OL
Input Voltage Low
Input Voltage High
Output Voltage Low
0
0.7V
CC
0.2V
CC
V
0.4
1
V
V
V
V
V
μ
A
mA
I
OL
= 1.00 mA
I
OL
= 50
μ
A [1]
I
= 0.75 mA [2]
0V, V
CC
[3]
V
OH
I
IL
I
CC
Output Voltage High
Input Leakage
Supply Current
V
–0.4
–.0
3.0
25
Notes:
[1] Pin 13 (HLF)
[2] Pin 17 (CT/SDA) is Open-Drain.
[3] V
DD
Digital + V
DD
Analog combined.
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