M66312P/FP

REJ03F0178-0201 Rev.2.01 Mar 31, 2008

Page 3 of 8

Functional Description

As M66312 uses silicon gate CMOS process, it realizes high-speed and high-output currents sufficient for LED drive

while maintaining low power consumption and allowance for high noises.

Each bit of a shiftregister consists of two flip-flops having independent clocks for shifting and latching.

operations being made when “L” changes to “H”.

Serial data input A is the data input of the first-step shiftregister and the signal of A shifts shiting registers one by one

When reset input

R is low, shift register and SQ

changed from low-level to high-level after the shift register is reset by

R.

When output-enable input

OE is high, Q

Even if

OE is changed, shift operation is not affected.

Function Table

(Note)

Operation Mode

Reset

Shift

latch

operation

3 state

Input

Parallel Data Output

R

L

X

H

H

H

H

X

CK

S

X

X

↑

X

↑

X

X

CK

L

X

↑

X

↑

X

↑

X

A

X

X

H

X

L

X

X

OE

L

L

L

L

L

L

H

Q

A

Q

A

0

L

Q

A

0

H

Q

A

0

L

Z

Q

B

Q

B

0

L

Q

B

0

q

A

0

Q

B

0

q

A

0

Z

Q

C

Q

C

0

L

Q

C

0

q

B

0

Q

C

0

q

B

0

Z

Q

D

Q

D

0

L

Q

D

0

q

C

0

Q

D

0

q

C

0

Z

Q

E

Q

E

0

L

Q

E

0

q

D

0

Q

E

0

q

D

0

Z

Q

F

Q

F

0

L

Q

F

0

q

E

0

Q

F

0

q

E

0

Z

Q

G

Q

G

0

L

Q

G

0

q

F

0

Q

G

0

q

F

0

Z

Q

H

Q

H

0

L

Q

H

0

q

G

0

Q

H

0

q

G

0

Z

Shift t1

Latch t2

Shift t1

Latch t2

Shift t1

Latch t2

Serial Data

Output SQ

H

L

L

q

G

0

q

G

0

q

G

0

q

G

0

q

H

Note

↑: Change from low-level to high-level

Q

X: Irrelevant

q

q: Contents of shift register

Z: High impedance