View upd6456gs-620 datasheet:

( ) UPD6456GS-620 1/2 IL00 ********** C-MOS ON SCREEN CHARACTER DISPLAY –TOP VIEW– 3 11 DATA VC1 CK IN 1 16 IN HSYNC 13 VC2 1 12 CKIN VBLK1 STB IN 2 15 IN VSYNC 2 14 STB VBLK2 DATA IN 3 14 VBLK2 OUT 16 HSYNC 15 9 VSYNC CK OUT IN 4 13 VC2 OUT PCL 7 6 OSC IN OSC OUT VDD 5 (+5V) 12 VBLK1 OUT PCL OSC OUT 6 11 VC1 OUT 4 OSC IN 7 NC 10 8 GND 9 CK OUT INPUT CK IN ; CLOCK FOR DATA READ DATA ; SERIAL DATA ; HORIZONTAL SYNC HSYNC OSC IN ; OSCILLATOR FOR DOT CLOCK GENERATOR ; POWER ON CLEAR PCL STB ; STROBE ; VERTICAL SYNC VSYNC OUTPUT CK OUT ; CLOCK FOR CHECK OSC OUT ; OSCILLATOR FOR DOT CLOCK GENERATOR VBLK1 ; VIDEO BLANKING 1 VBLK2 ; VIDEO BLANKING 2 VC1 ; CHARACTER SIGNAL 1 VC2 ; CHARACTER SIGNAL 2 ( ) U