GS1881, GS4881, GS4981 Monolithic Video Sync

Separators

Data Sheet

6926 - 5

November 2009

6 of 29

Proprietary & Confidential

2.3 GS4981 Electrical Characteristics

Table 2-2 shows the electrical characteristics of the GS4981 where conditions are

Horizontal Scan Rate

15

–

130

kHz

Logic Outputs

4.2

4.6

–

V

11.2

11.6

–

V

1.6mA

2.4

3.4

–

V

9.4

10.4

–

V

–

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 2-2: GS4881 Electrical Characteristics (Continued)

Parameter

Conditions

Min

Typ

Max

Units

Table 2-3: GS4981 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)