BA823F

Technical Note

3/8

www.rohm.com

2009.06 - Rev.A

© 2009 ROHM Co., Ltd. All rights reserved.

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Block diagram

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Pin descriptions

Pin No.

Pin Name

Symbol

Function

2

SHIFT PULSE

C

Shift pulse of shift register

15

DATA INPUT

Data input of shift register is stored during the shift pulse rise time.

1

STROBE

S

When “1” is effective, the content of shift register is outputted.

12

OUTPUT

“0” is effective when the content of register is “1” on the 1st bit is outputted.

11

OUTPUT

“0” is effective when the content of register is “1” on the 2nd bit is outputted.

10

OUTPUT

“0” is effective when the content of register is “1” on the 3rd bit is outputted.

9

OUTPUT

“0” is effective when the content of register is “1” on the 4th bit is outputted.

8

OUTPUT

“0” is effective when the content of register is “1” on the 5th bit is outputted.

7

OUTPUT

“0” is effective when the content of register is “1” on the 6tht bit is outputted.

6

OUTPUT

“0” is effective when the content of register is “1” on the 7tht bit is outputted.

5

OUTPUT

“0” is effective when the content of register is “1” on the 8th bit is outputted.

3

DATA OUTPUT

Do

16

5.0V .is used normally (±10%)

13

GND

4

GND

14

GND

GND(Dig)

Especially, GND of the logic circuit

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Description of operation

BA823 is configured internally as shown in the block diagram. Terminals of clock C, data D1, and strobe S are used as input.

Data input is synchronized with the clock, read serially during the rise time and latched at the rise time edge of the shifted

shown in the time chart of Fig.5. Pulse width is the same as that of the strobe input pulse.

Data output terminal D0, is a terminal used for cascade connection of the IC, where the output of the final stage of the shift

register has appeared, and is connected to the next data input terminal D1. In this case, when the clock and the strobe are

used in conjunction, output terminal can be increased by 8 bits at a time.

1

15

2

16

3

13

4

14

12

11

10

9

8

7

6

5

GND

(Dig)

STROBE INPUT S

SHIFT PULSE C