Table 2-3: GS4981 Electrical Characteristics (Continued)
Parameter
Conditions
Min
Typ
Max
Units
(a) Delay from Rising Edge of Sync
(b) Pulse Width
CL = 15p
400
2.0
H
500
2.5
H
650
3.2
H
ns
μs
–
(c) Occurrence Rate
Vertical Sync Out (Pin 3)
(a) Pulse Width
Serrations during vertical interval
No serrations during vertical interval
197.7
48
197.7
65
197.7
82
μs
μs
(b) Default Starting Time
Horizontal Sync Out (Pin 7)
(a) Delay From Video
CL = 15p
90
190
290
ns
(b) Pulse Width
5.0
15
7.0
–
9.0
μs
Horizontal Scan Rate
Modified RSET
130
kHz
Logic Outputs
(a) VOH
Ι
OH = 40μA
VCC = 5V
VCC = 12V
VCC = 5V
4.2
11.2
2.4
4.6
11.6
3.4
–
–
–
V
V
V
Ι OH
=
1.6mA
See Note 3.
V
CC = 12V
9.4
–
10.4
0.3
–
V
V
(b) VOL
NOTES:
Ι
OL = 1.6mA
0.6
1. When placing the RSET resistor and the 0.1μF decoupling capacitor, careful attention should be made to ensure that they are as close as
possible to Pin 6. Care should also be taken to avoid parasitic capacitive coupling from any output pin (Pins 1, 3, 5 and 7) to Pin 6.
2. Measured from slicing point of input falling edge to 50% point of composite sync falling edge.
3. Applies only to composite sync, vertical sync, and back porch outputs. Horizontal sync has a passive 10kΩ pull-up to VCC
.
GS1881, GS4881, GS4981 Monolithic Video Sync
Separators
7 of 29
Proprietary & Confidential
Data Sheet
6926 - 5
November 2009
GENNUM [ GENNUM CORPORATION ]
