SN28835

1/2-INCH NTSC TIMER

SOCS023B – FEBRUARY 1991

4

POST OFFICE BOX 655303

Terminal Functions (Continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

S1

24

O

Serial clock 1

S2

25

O

Serial clock 2

S3

26

O

Serial clock 3

T

23

O

Transfer-gate clock

VCC

22

DC power

VCR

40

I

Vertical-counter reset

VD

16

O

Vertical drive

VDS

42

I

Vertical-dump speed. When VDS is high, the vertical-dump frequency is 3.58 MHz; when VDS is low,

the vertical-dump frequency is 2 MHz.

VD2

17

O

Real-display-area signal. VD2 is a test point and is not used in normal operation.

VGATE

19

O

Decoded V count signal. VGATE is a test point and is not used in normal operation.

WHTA

18

O

WHTA is a test point and is not used in normal operation.

X1

34

Crystal oscillator (see Figure 2)

X2

35

Crystal oscillator (see Figure 2)

12

3

tint

Flush Pulses

Transfer Pulse

GP

Figure 1. GP Flush and Transfer Pulses