8-41

Pin Descriptions

PIN NO.

SYMBOL

DESCRIPTION

1

XRC

Delay, Genlock to Crystal Oscillator. Resistor, diode and capacitor connection for delay that automatically

turns on the crystal oscillator when the genlock input is removed. When the signal on Terminal 1 is high the crys-

tal oscillator is inhibited. Typical values for R and C are 1M

Ω and 0.001µF. For operation as a crystal controlled

2

XTP

Crystal Oscillator Feedback Tap. Feedback connection (tap) for crystal oscillator. When a crystal (shunted by

a1M

Ω resistor) is connected between this terminal and Terminal 23, and a 100pF capacitor is connected from

ter, the crystal frequency is 504.000kHz (Note 1); and for a 625-line, 25-frame/second raster, the crystal frequen-

cy is 500.000kHz (Note 1).

4HD

Horizontal Drive Output

5MS

Mixed Sync Output

6C

Capacitor Connection for R-C Genlock Oscillator

7

MBB

Mixed Beam Blanking Output

8

VRE

Vertical Counter Reset to First Equalizing Pulse. A low level signal on this terminal resets the vertical counter

9VD

Vertical Drive Output

10

VRV

Vertical Counter Reset to First Vertical Sync Pulse. A low level signal on this terminal resets the sync gen-

erator to the first vertical sync pulse of a field. For genlock operation, Terminal 10 is used as a resistor and ca-

pacitor connection for an integrator network that detects vertical sync pulses in a master sync waveform to which

the sync generator is to be genlocked. R is 22k

Ω, and C is 0.001µF. When not in use this terminal should be

11

HC

Horizontal Clamp Output

12

Negative Power Supply Voltage

13

MPB

Mixed Processing Blanking Output

14

HPB

Horizontal Processing Blanking Output

15

FS2

Frame Sync Output (Odd Field). A pulse coinciding with the first equalizing pulse is produced at the beginning

of every odd field.

16

SVD

Short Vertical Drive Output

17

VPB

Vertical Processing Blanking Output

18

SW

Operation Switch for 525-Line or 625-Line Raster. A high level signal on Terminal 18 causes the sync gener-

ator to generate a 625-line raster. An internal pulldown resistor is connected to Terminal 18, so in the absence

of an applied input to this terminal, a 525-line raster is produced.

19

20

GEN

Genlock Input Composite Sync. A negative going reference mixed sync waveform applied to Terminal 20 dis-

ables the crystal oscillator and locks the R-C genlock oscillator to the horizontal pulses of the reference sync

waveform. Vertical sync detection is achieved by an R-C integrator connected from Terminal 20 to Terminal 10

(vertical reset to first vertical sync pulse). An internal pull-up resistor is connected to Terminal 20 so that in the

absence of an applied input the crystal oscillator is enabled and the R-C genlock oscillator is disabled.

21

XR

Delay, Genlock to Crystal Oscillator, Resistor and Diode Connection for Delay, Genlock to Crystal Oscil-

lator. Automatically turns on the crystal oscillator when the input to Terminal 20 is removed.

22

RC

Resistor and Capacitor Connection for Genlock Oscillator. If the genlock oscillator is not used this terminal

23

XIN

Master Frequency Input.

24

R

Resistor Connection for Genlock Oscillator.

NOTE: 32 times horizontal frequency.

CD22402