SP504MCF-L Exar Corporation, SP504MCF-L Datasheet - Page 29

• Manufacturer Part Number: SP504MCF-L
• Description: IC, WAN MULTIMODE SERIAL TXRX, MQFP-80
• Manufacturer: Exar Corporation

Specifications of SP504MCF-L

• Device Type: Transceiver
• No. Of Drivers: 7
• Supply Voltage Range: 4.75V To 5.25V
• Driver Case Style: MQFP
• No. Of Pins: 80
• Operating Temperature Range: 0°C To +70°C
• Termination Type: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADDITIONAL TRANSCEIVERS
WITH THE SP504
Serial ports usually can have two data sig-
nals (SD, RD), three clock signals (TT, ST,
RT), and at least eight control signals (CS,
RS, etc.). EIA-RS-449 contains twenty six
signal types for a DB-37 connector. A DB-
37 serial port design may require thirteen
drivers and fourteen receivers
many applications do not use all these
signals, some applications may need to
support extra functions such as diagnostics.
The SP504 supports enough transceivers
for the primary channels of data, clock and
control signals. Configuring LL, RL and TM
would require two additional drivers and one
receiver if designing for a DTE (one driver
and two receivers for a DCE).
A programmable transceiver such as the
SP332 is a convenient solution in a design
that requires extra single ended or differential
drivers/receivers. As shown in Figure 28, the
SP332 can be configured to four different
variations.
The SP332 in Figure 29 is configured for two
single-ended drivers and one diffferential
receiver. For a DTE design, the two drivers
are used for LL and RL signals and
SEL A
SEL B
LOOPBACK
SHUTDOWN
Figure 28. Mode selection for the SP332
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
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the receiver is used for the TM signal. This
configuration was selected because the two
RS-232 drivers can be used for RS-423 by
connecting a zener clamping diode to ground
on the two driver outputs. The diodes will
limit the voltage swing on the outputs so that
the V
specification. The differential receiver can
be easily configured to RS-423 by ground-
ing the non-inverting input. The receiver will
adhere to the RS-423 specifications.
MNEMONIC
CIRCUIT
RS-449 Interchange Circuits Table
SG
SC
RC
IS
IC
TR
DM
SD
RD
TT
ST
RT
RS
CS
RR
SQ
NS
SF
SR
SI
SSD
SRD
SRS
SCS
SRR
LL
RL
TM
SS
SB
OC
= ±4V to ±6V adheres to the RS-423
SEND COMMON
SIGNAL GROUND
RECEIVE COMMON
TERMINAL IN SERVICE
INCOMING CALL
TERMINAL READY
DATA MODE
SELECT FREQUENCY
SELECT STANDBY
STANDBY INDICATOR
SEND DATA
RECEIVE DATA
REQUEST TO SEND
CLEAR TO SEND
RECEIVER READY
SIGNAL QUALITY
NEW SIGNAL
SIGNAL RATE SELECTOR
TEST MODE
TERMINAL TIMING
SEND TIMING
SIGNAL RATE INDICATOR
SECONDARY SEND DATA
SECONDARY RS
SECONDARY CS
REMOTE LOOPBACK
RECEIVE TIMING
SECONDARY RD
SECONDARY RR
LOCAL LOOPBACK
CIRCUIT NAME

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0
DIRECTION
--------------
TO DCE
FROM DCE
TO DCE
FROM DCE
TO DCE
FROM DCE
TO DCE
FROM DCE
TO DCE
FROM DCE
FROM DCE
TO DCE
FROM DCE
FROM DCE
FROM DCE
TO DCE
TO DCE
TO DCE
FROM DCE
TO DCE
FROM DCE
TO DCE
FROM DCE
FROM DCE
TO DCE
TO DCE
FROM DCE
TO DCE
FROM DCE
CIRCUIT



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SP504_02_2708
CONTROL
CONTROL
CONTROL
CONTROL
COMMON
CONTROL
DATA
TIMING
DATA
CIRCUIT
TYPE