MAS9138 MAS, MAS9138 Datasheet - Page 7

• Manufacturer Part Number: MAS9138
• Description: ASYNCHRONOUS TO SYNCHRONOUS CONVERTER
• Manufacturer: MAS

APPLICATION INFORMATION
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.
Another application is a synchronous serial interface for uP which uses UART as a data source. The concept is
illustrated below.
RS232C
INTERFACE
Synchronous modem with asynchronous interface
Synchronous serial interface with uP interface
TXD
RXD
uP-INTERFACE
UART
RDO
TDI
TDO
RDI
MAS9138
M AS9138
TDO
TXC
RDI
RXC
T TL/V.28
MODEM CIRCUITS
RxD
RxC
TxD
TxC
RS-232-C
V.24
PHONE LINE
12 April, 2006
DA9138.005
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