GS1881, GS4881, GS4981 Monolithic Video Sync

Separators

Data Sheet

6926 - 5

November 2009

5 of 29

Proprietary & Confidential

2.2 GS4881 Electrical Characteristics

Table 2-2 shows the electrical characteristics of the GS4881 where conditions are

–

0.3

0.6

V

NOTES:

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.

Table 2-1: GS1881 Electrical Characteristics (Continued)

Parameter

Conditions

Min

Typ

Max

Units

Table 2-2: GS4881 Electrical Characteristics

Parameter

Conditions

Min

Typ

Max

Units

Supply Voltage

–

4.5

5

13.2

V

Supply Current

Outputs at

Logic 1

–

4.6

30

mA

–

5.0

6.5

mA

Video Input (Pin 2)

(a) Signal Level

0.5

–

4

Vp-p

(b) Clamp Current

Charge

500

650

850

μA

Discharge - normal

9

11

13

μA

Discharge - Nosync flag raised

65

95

115

μA

(c) Delay to raising of Nosync flag

Video input held high

64

95

130

μs

(d) Sync Tip Clamp Voltage

–

–

1.55

–

V

Sync Slice Level

Relative to sync tip clamp voltage

70

77

84

mV

RSET Pin Reference Voltage (Pin 6)

See Note 1.

1.14

1.24

1.34

V

Composite Sync Out (Pin 1)

See Note 2.

40

60

80

ns

Delay from Video

Back Porch Pulse Out (Pin 5)

(a) Delay from Rising Edge of Sync

400

500

650

ns

(b) Pulse Width

2.0

2.5

3.2

μs

(c) Occurrence Rate

H

H

H

–

Vertical Sync Out (Pin 3)

(a) Pulse Width

Serrations during vertical interval

197.7

197.7

197.7

μs

(b) Default Starting Time

No serrations during vertical interval

48

65

82

μs