參數(shù)資料
型號: LM1881
廠商: National Semiconductor Corporation
英文描述: LM1881 Video Sync Separator
中文描述: LM1881視頻同步分離器
文件頁數(shù): 3/12頁
文件大?。?/td> 303K
代理商: LM1881
Electrical Characteristics LM1881–X
V
CC
= 5V; R
SET
= 680 k
; T
A
= –40C to +85C by correlation with 100% electrical testing at T
A
=25C
Parameter
Conditions
Supply Current
Outputs at
Logic 1
DC Input Voltage
Pin 2
Input Threshold Voltage
Input Discharge Current
Pin 2; V
IN
= 2V
Input Clamp Charge Current
Pin 2; V
IN
= 1V
R
SET
Pin Reference Voltage
Pin 6;
Composite Sync. & Vertical
Outputs
Logic 1
I
OUT
= 1.6 mA
Logic 1
Burst Gate & Odd/Even
Outputs
Logic 1
Composite Sync. Output
I
OUT
= 1.6 mA; Logic 0; Pin 1
Vertical Sync. Output
I
OUT
= 1.6 mA; Logic 0; Pin 3
Burst Gate Output
I
OUT
= 1.6 mA; Logic 0; Pin 5
Odd/Even Output
I
OUT
= 1.6 mA; Logic 0; Pin 7
Vertical Sync Width
Burst Gate Width
2.7 k
from Pin 5 to V
CC
Vertical Default Time
Min
Typ
5.2
5.5
1.5
70
11
0.8
1.22
4.5
Max
10
12
1.8
85
16
Units
V
CC
= 5V
V
CC
= 12V
mA
1.3
55
6
0.2
1.10
4.0
11.0
2.4
10.0
4.0
11.0
V
mV
μA
mA
V
1.35
I
OUT
= 40 μA;
V
CC
= 5V
V
CC
= 12V
V
CC
= 5V
V
CC
= 12V
V
CC
= 5V
V
CC
= 12V
V
3.6
V
I
OUT
= 40 μA;
4.5
V
0.2
0.2
0.2
0.2
230
4
65
0.8
0.8
0.8
0.8
588
4.7
90
V
V
V
V
μs
μs
μs
140
2.2
32
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the
Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed.
Note 2:
For operation in ambient temperatures above 25C, the device must be derated based on a 150C maximum junction temperature and a package thermal
resistance of 110C/W, junction to ambient.
Note 3:
ESD susceptibility test uses the “human body model, 100 pF discharged through a 1.5 k
resistor”.
Note 4:
Typicals are at T
J
= 25C and represent the most likely parametric norm.
Note 5:
Relative difference between the input clamp voltage and the minimum input voltage which produces a horizontal output pulse.
Note 6:
Careful attention should be made to prevent parasitic capacitance coupling from any output pin (Pins 1, 3, 5 and 7) to the R
SET
pin (Pin 6).
Note 7:
Delay time between the start of vertical sync (at input) and the vertical output pulse.
Typical Performance Characteristics
R
Value Selection
vs Vertical Serration
Pulse Separation
Vertical Default
Sync Delay Time
vs R
SET
00915007
00915008
L
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