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PDF MAS7838S Data sheet ( Hoja de datos )
| Número de pieza | MAS7838S | |
| Descripción | SYNCHRONOUS TO ASYNCHRONOUS CONVERTER SAC CMOS | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAS7838S (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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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
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• 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
CL1
CL2
XESR
TMG
OSC
TSL
TXC
TDO
RXC
RDI
XASY
XHST
VSS
CONTROL
O
S
C
ASYNC
TO
SYNC
SYNC
TO
ASYNC
_> 1
VDD
TDI
RDO
1 (9)
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The MAS7838 requires clock signals in order to function
properly. The synchronous data transfer always
requires the TXC clock. The clock is used internally for:
-shifting data out from the TX buffer (to pin TDO)
-shifting data into the RX buffer (via pin RDI)
-detection of the bit rate in order to adjust the internal
baud rate generator (only if TSL = 1)
DA7838.002
20 September, 2000
The asynchronous data transfer (pins TDI, TDO) is
accomplished by generating an internal timing signal for
the asychronous circuits. This internal timing signal
(16T) is 16 times the TXC bit rate in order to sample the
asynchronous data stream (TDI) at the proper speed.
Timing Circuits
16 x TXC
MAS 7838
TXC
EXTERNALLY GENERATED 16T CLOCK
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The MAS7838 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
TXD
RXD
TDI
RDO
MAS9138
TDO
TXC
RDI
RXC
MODEM CIRCUITS
PHONE LINE
5 (9)
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAS7838S.PDF ] | |
Hoja de datos destacado
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