DA7838.002

20 September, 2000

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The MAS7838 is a single chip duplex synchronous to

asynchronous converter. It converts asynchronous start

stop characters to synchronous character format, with

stop bit deletion when required as defined in the CCITT

recommendation V.14 (V.22). On the receiver channel

the MAS7838 converts the incoming synchronous data

to asynchronous start stop character format with stop bit

insertion when required as defined in the CCITT

recommendation V.14 (V.22).The MAS7838 implements

the data modes for the synchronous interface as

specified in the V.14 (V.22). The device can be

configured to operate at any frequency to maximum

device speed within the above mentioned modes.

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• Implements CCITT recommendations V.14 and

V.22 chapters 4.1, 4.2 and 4.3

• Operates in modes as defined in the CCITT

recommendations V.22 (i), ii), iii), iv) and v)

• Transmission rate up to 64 kbit/s

• CMOS compatible interface

• Low power consumption (typically 25 mW)

• No additional circuitry required to perform the

conversion

• CMOS device

• Single =5V supply

•

Adapts asynchronous terminals to synchronous

modems

•

Full or half card PC modems using UART as a

data source

•

Simplifying data multiplexing in a MUX/DEMUX

system

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CL1

CL2

XESR

TMG

OSC

TSL

TXC

TDO

RXC

RDI

XASY

XHST

VSS

VDD

TDI

RDO

CONTROL

O

S

C

ASYNC

TO

SYNC

SYNC

TO

ASYNC

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