SN28835

1/2-INCH NTSC TIMER

SOCS023B – FEBRUARY 1991

8

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

GT2

SC,SC(90)

CLK2M

T

PS

S1, S2, S3

HGATE

BCP2

BCP1

BF

CP2

CP1

Horizontal

Scale†

(130)

Continuous

Continuous

20

14

22

0

13

3

68

58

3

123

73

68

8

3

21

0

13

3

70

65

60

55

30

25

20

15

10

5

0

125

120

4.77273 MHz

4.77273 MHz

4.77273 MHz

35

79 11 13

35 7 9 11

1

13 15

CSYNC‡

SH1,GT3/SH2,

GT1/SH3

75

95

98

Case 1

Case 2

Case 3

CBLK

† 130 intervals equal 63.55

µs equals one horizontal-scan line

‡ CSYNC varies depending on which horizontal-scan line of a 262.5-line TV field is being examined:

• Case 1 depicts the equalizing pulses that occur during horizontal-scan lines 1, 2, 3, 7, 8, and 9.

• Case 2 depicts the vertical serration pulses that occur during horizontal-scan lines 4, 5, and 6.

• Case 3 applies to all remaining horizontal-scan lines.

Figure 4. Horizontal Timing