SP504 Sipex, SP504 Datasheet - Page 28

• Manufacturer Part Number: SP504
• Description: WAN Multi-Mode Serial Transceiver
• Manufacturer: Sipex

ADDITIONAL TRANSCEIVERS
WITH THE SP504
Serial ports usually can have two data signals
(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 re-
ceivers
use all these signals, some applications may
need to support extra functions such as diagnos-
tics. 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/receiv-
ers. 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 re-
ceiver. For a DTE design, the two drivers are
used for LL and RL signals and the receiver is
used for the TM signal. This configuration was
selected because the two RS-232 drivers can be
Figure 28. Mode selection for the SP332
Rev: A Date:1/27/04
SEL A
SEL B
LOOPBACK
SHUTDOWN
1
. Although many applications do not
22
26
27
28
19
21
20
1
TI1
TI2
TI3
TI4
RX1
RX2
RX3
RX4
T1
T2
T3
T4
0
0
1
0
R2
R3
R1
R4
TX1
TX3
TX4
TX2
RI1
RI2
RI3
RI4
17
18
15
16
7
6
4
3
26
28
19
27
20
21 RX3
TI1
TI2
TI3
RX1
RX2
SP504 Multi–Mode Serial Transceivers
T3
T1
T2
0
1
1
0
R1
R3
R2
28
TX1 6
TX3
TX4
TX2 7
RI1
RI3
RI4
RI2 16
used for RS-423 by connecting a zener clamp-
ing diode to ground on the two driver outputs.
The diodes will limit the voltage swing on the
outputs so that the V
the RS-423 specification. The differential re-
ceiver can be easily configured to RS-423 by
grounding the non-inverting input. The receiver
will adhere to the RS-423 specifications.
1
15
18
17
4
MNEMONIC
3
CIRCUIT
RS-449 Interchange Circuits Table
SG
SC
RC
I S
I C
TR
DM
SD
RD
TT
ST
RT
RS
CS
RR
SQ
NS
SF
SR
S I
SSD
SRD
SRS
SCS
SRR
L L
RL
TM
SS
SB
19
26
28
21
22
1
RX4
TI1
TI3
TI4
RX1
RX3
SIGNAL GROUND
SEND COMMON
RECEIVE COMMON
TERMINAL IN SERVICE
INCOMING CALL
TERMINAL READY
DATA MODE
SEND DATA
RECEIVE DATA
TERMINAL TIMING
RECEIVE TIMING
REQUEST TO SEND
CLEAR TO SEND
RECEIVER READY
SIGNAL QUALITY
NEW SIGNAL
SELECT FREQUENCY
SIGNAL RATE SELECTOR
SIGNAL RATE INDICATOR
SECONDARY SEND DATA
SECONDARY RD
SECONDARY RS
SECONDARY CS
SECONDARY RR
LOCAL LOOPBACK
REMOTE LOOPBACK
TEST MODE
SELECT STANDBY
STANDBY INDICATOR
CIRCUIT NAME
SEND TIMING
T1
T3
T4
R1
R3
R4
1
0
1
0
TX3
TX1
TX2
TX4
RI1
RI2
RI3
RI4
OC
15
16
17
18
4
3
7
6
© Copyright 2004 Sipex Corporation
= ±4V to ±6V adheres to
26
28
21 RX3
19
DIRECTION
CIRCUIT
- - - - - - - - - - - - - -
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
RX1
TI3
TI1
1
1
1
0
T3
T1
R1
R3
CONTROL
CONTROL
CONTROL
CONTROL
TIMING
COMMON
CONTROL
DATA
DATA
CIRCUIT
TYPE
TX2
TX1
TX3
TX4
RI1
RI3
RI4
RI2
15
16
18
6
7
17
4
3