MAS9138S View Datasheet(PDF) - Micro Analog Systems Oy

Part Name

Description

Manufacturer

MAS9138S

Asynchronous to synchronous converter

Micro Analog Systems Oy 

DA9138.003

29 January, 2001

APPLICATION INFORMATION

u Synchronous modem with asynchronous interface

The MAS9138 is intended for applications where an asynchronous and synchronous data source must be linked

together. A typical case appears in a data modem where the terminal interface of the modem has been specified to

be asynchronous but the modem data pump operates in a synchronous fashion.

RS232C

INTERFACE

MAS9138

MODEM CIRCUITS

TXD

RXD

TDI

RDO

TDO

TXC

RDI

RXC

PHONE LINE

u Synchronous serial interface with uP interface

Another application is a synchronous serial interface for uP which uses UART as a data source. The concept is

illustrated below.

UART

MAS9138

T T L /V .2 8

RS-232-C

V.24

TxD

uP-INTERFACE

RDI

TDO

RxD

RxC

TxC

7 (10)

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