¡ Semiconductor

MSC1164

5/13

PIN DESCRIPTION

Pin

Symbol

Function

Description

26 - 7

HVO1 -

HVO20

Driver Output

Driver output pin, applicable to each bit of shift register.

27

Driver Power Supply

Power supply pin for driver circuit.

28

GND

Driver GND

Logic GND

GND pin for the driver circuit.

GND pin for the logic circuit.

Clear input pin with pull-up resistor. Normally "H" level. In this

condition, the driver outputs "H" or "L" according to the

corresponding latch output level. Setting this pin to "L" enables

the driver output to be fixed at "L" irrespective of latch output.

CL

Clear Input

5

Latch strobe input pin with neither pull-up nor pull-down resistor.

When LS is "H", the output of the shift register becomes that of the

latch circuit.

When LS is "L", the latch circuit holds the contents of the shift

register that are immediately before LS goes "L".

LS

Latch Strobe Input

4

30

DIN

Data Input

Shift register input pin with neither pull-up nor pull-down resistor.

Display data is input in synchronization with clock. (Positive Logic)

6

Logic Power Supply

Power supply pin for logic (except driver).

29

CLK

Clock Input

Clock input pin. Data of shift register is shifted from one stage to

the next at the rising edge of clock.

3

DOUT

Data Output

Serial output pin for shift register.

31

CHG

Test Input

Test input pin with a pull-down resistor. Normally "L". If CL = "H"

in this condition, the driver outputs "H" or "L" according to the

corresponding latch output.

Note:

Pin numbers shown are for 32-pin plastic SSOP.