¡ Semiconductor

MSC1164

11/13

FUNCTIONAL DESCRIPTION

Function Table

CLK

R-1

DIN

H

L

H

L

R1n

R1n

R2n

R2n

R3n

R3n

R19n

R19n

R19n

R19n

CL

CHG

LS

X

H

L

L

X

X

H

H

L

H

H

L

X

X

H

L

R.X

HVO.X

L

H

H

H

LL

NC

X

H

DOUT

R-20

•••••••••••••••

R-4

R-3

R-2

L: Low Level, H: High Level, X: Don't Care, NC: Change

NOTES ON USE

1.

The MSC1164 is designed as a grid/anode driver of VFD.

The data applied to the data input pin is read into the shift register at the rising edge of the

clock and shifted sequencially to the shift register synchronizing with the clock.

The shift register output drives the output driver, passing through the latch and the NOR

circuit.

Setting the CL pin to "L" makes all driver outputs go into "L". This function can be used for

setting display blanking.

2.

The contents of the shift register are undefined after power is turned on.

Therefore, two or more driver outputs may go into "H" at the same time after power-on. (If

it happens, an overloading beyond the power dissipation limit may occur to cause a device

break-down.)

To avoid this, take the following procedure:

1) Turn on the power of the logic portion while holding the CL pin to "L".

2) Turn on the power of the driver portion.

3) Apply a "L" level signal to the DIN pin and send clock pulses by the specified number

of grids to reset ("L") the entire contents of the shift register.

4) Initialize the driver outputs to "L".