Pin Functions

No. 5396-4/15

LC74751

Pin no.

Pin

Function

Notes

1

Ground

Ground (digital system ground)

2

Crystal oscillator

Connections for the crystal and capacitors used to form the crystal oscillator for generating

3

internal synchronizing signals.

4

TEST

Test output

Test data output

5

RST

Reset input

System reset input (This input has hysteresis characteristics.)

6

SCLK

Clock input

Clock input for the serial data input function (This input has hysteresis characteristics.)

7

SIN

Data input

Serial data input (This input has hysteresis characteristics.)

Data is input in 16-bit units.

8

CS

Enable input

Serial data input enable input (This input has hysteresis characteristics.)

Serial data input is enabled when this pin is low.

9

LVBK

Blanking level adjustment input

Level input signal used to adjust the blanking level.

10

LVCHA

Character level adjustment input

Level input signal used to adjust the character level.

11

Power supply

Composite video signal adjustment power supply (analog system power supply)

12

Video signal output

Composite video signal output

13

NC

This pin must be either connected to ground or left open.

14

Video signal input

Composite video signal input

15

Power supply

Power supply (+5 V)

16

Sync separator circuit input

Input to the composite sync signal sync separator circuit

17

Sync separator circuit adjustment

Sync separator circuit adjustment

18

Composite sync signal output

Sync separator circuit composite sync signal output

19

Vertical synchronizing signal input

20

LC oscillator

Connections for the coil and capacitor that form the oscillator used to generate the character

21

output dot clock.

22

Power supply (+5 V)

Power supply (+5 V)