Table 2-2: GS4881 Electrical Characteristics (Continued)
Parameter
Conditions
Min
Typ
Max
Units
Horizontal Scan Rate
Modified RSET
15
–
130
kHz
Logic Outputs
(a) VOH
Ι
OH = 40μA
VCC = 5V
CC = 12V
VCC = 5V
CC = 12V
4.2
11.2
2.4
9.4
–
4.6
11.6
3.4
–
–
V
V
V
V
V
V
Ι OH
1.6mA
=
–
V
10.4
0.3
–
(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.
2.3 GS4981 Electrical Characteristics
Table 2-2 shows the electrical characteristics of the GS4981 where conditions are
V
= 5V, R = 680kΩ, T =25°C, unless otherwise shown.
SET A
CC
Table 2-3: GS4981 Electrical Characteristics
Parameter
Conditions
Min
Typ
Max
Units
Supply Voltage
Supply Current
–
4.5
–
5
13.2
30
V
Outputs at
Logic 1
V
CC = 5V
4.6
mA
V
CC = 12V
–
5.0
6.5
mA
Video Input (Pin 2)
(a) Signal Level
V
CC = 5V
Charge
Discharge - normal
0.5
–
4
Vp-p
(b) Clamp Current
500
9
650
11
850
13
μA
μA
μA
μs
Discharge - Nosync flag raised
Video input held high
–
65
64
–
95
115
130
–
(c) Delay to raising of Nosync flag
(d) Sync Tip Clamp Voltage
Sync Slice Level
95
1.55
77
V
Relative to sync tip clamp voltage
See Note 1.
70
1.14
40
84
mV
V
RSET Pin Reference Voltage (Pin 6)
Composite Sync Out (Pin 1)
Delay from Video
1.24
60
1.34
80
See Note 2.
CL = 15p
ns
Back Porch Pulse Out (Pin 5)
GS1881, GS4881, GS4981 Monolithic Video Sync
Separators
Data Sheet
6 of 29
Proprietary & Confidential
6926 - 5
November 2009
GENNUM [ GENNUM CORPORATION ]
