SP504 datasheet(28/31 Pages) SIPEX

28 / 31 page

Rev: A Date:1/27/04

SP504 Multi–Mode Serial Transceivers

SEL A

SEL B

LOOPBACK

SHUTDOWN

TX4

TI4

RI1

RX1

RI2

RX2

RI3

RX3

RI4

RX4

TX1

TI1

TX2

TI2

TX3

TI3

TX1 6

TI1

TI2

TX2 7

RI1

RX1

RX2

RI2 16

TX3

TX4

TI3

RI4

RI3

21 RX3

TX1

TI1

TX2

RI1

RX1

RI2

TX4

TI4

TX3

TI3

RI3

RX3

RI4

RX4

TX1

TI1

TX2

TX3

TX4

TI3

RI1

RX1

RI2

RI4

RI3

21 RX3

Figure 28. Mode selection for the SP332

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-

ceivers1. Although many applications do not

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

CIRCUIT

CIRCUIT NAME

CIRCUIT

MNEMONIC

DIRECTION

TYPE

SIGNAL GROUND

--------------

SEND COMMON

TO DCE

RECEIVE COMMON

FROM DCE

TERMINAL IN SERVICE

TO DCE

INCOMING CALL

FROM DCE

TERMINAL READY

TO DCE

DATA MODE

FROM DCE

SEND DATA

TO DCE

RECEIVE DATA

FROM DCE

TERMINAL TIMING

TO DCE

SEND TIMING

FROM DCE

RECEIVE TIMING

FROM DCE

REQUEST TO SEND

TO DCE

CLEAR TO SEND

FROM DCE

RECEIVER READY

FROM DCE

SIGNAL QUALITY

FROM DCE

NEW SIGNAL

TO DCE

SELECT FREQUENCY

TO DCE

SIGNAL RATE SELECTOR

TO DCE

SIGNAL RATE INDICATOR

FROM DCE

SSD

SECONDARY SEND DATA

TO DCE

SRD

SECONDARY RD

FROM DCE

SRS

SECONDARY RS

TO DCE

SCS

SECONDARY CS

FROM DCE

SRR

SECONDARY RR

FROM DCE

LOCAL LOOPBACK

TO DCE

REMOTE LOOPBACK

TO DCE

TEST MODE

FROM DCE

SELECT STANDBY

TO DCE

STANDBY INDICATOR

FROM DCE

COMMON

CONTROL

DATA

TIMING

CONTROL

DATA

CONTROL

1 RS-449 Interchange Circuits Table

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

OC = ±4V to ±6V adheres to

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.

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