ROHM BU8307CS, BU8307CF Datasheet

Communication ICs

Pulse / tone dialer for telephone set

BU8307CS / BU8307CF

The BU8307CS and BU8307CF are large scale integrated circuits with a pulse dialer and tone dialer integrated on a single chip. These products are capable of dialing in either pulse or tone mode, and can redial up to 32 digits.

Applications Telephones and cordless telephones

Features

1) The chip includes both a pulse and tone dialer, making it possible to dial in either pulse or tone mode.

2) A wide operating voltage range enables direct powering by line current. The voltage range guaranteed for both pulse and tone dialing is 2.5V to 5.5V.

3) A built-in memory enables redialing of up to 32 digits. Note: In tone mode, the memory itself uses one digit, so please be aware that a maximum of 31 digits can be redialed.

4) The chip conforms to the standards of Japan, Ameri-

ca, Canada, England, Korea, Taiwan, and Australia.

5) The V

6) There is little deviation in the frequency dividing for

DD power supply voltage is independent of the

DTMF output level.

the DTMF output frequency. The maximum on the + side is + 0.15%, and on the - side is – 0.08%.

Block diagram

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