ROHM BU8244F, BU8242F, BU8241FS, BU8241F Datasheet

Communication ICs

Cross point mixer for telephones

BU8241F / BU8241FS / BU8242F / BU8244F

The BU8241F, BU8241FS, BU8242F, and BU8244F are ICs developed for use with cordless telephones, and are
equipped with switching and mixing functions. In addition, these ICs are provided with an internal power save function
which enables the circuit to be run on line current if the power supply fails, by connecting a switch between the circuit
and a new handset, reducing line current consumption. A series of these ICs is also under development, based on the
number of circuits.

Applications
Telephones, telephone answering machines, cordless
telephones

Features

1) Eight input signals are selected and mixed by a
cross-point, and output to eight pins (BU8241F /
BU8241FS).

2) A power save mode enables the circuit to run on line
current if the power supply fails.

1. Line current consumption reduced

(I

DD2 = 580µA)

2. IN1  OUT1 and IN2  OUT2 only are on

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3) Serial binary data input.

4) Low voltage and current consumption.

Communication ICs BU8241F / BU8241FS / BU8242F / BU8244F

Block diagram

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Communication ICs BU8241F / BU8241FS / BU8242F / BU8244F

FAbsolute maximum ratings (Ta = 25_C)

FRecommended operating range (Ta = 25_C)

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Communication ICs BU8241F / BU8241FS / BU8242F / BU8244F

FElectrical characteristics (unless otherwise noted, Ta = 25_C, VDD = 5V)

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