SP502 datasheet(10/32 Pages) SIPEX

10 / 32 page

Rev. 7/21/03

SP502 Multi-Mode Serial Transceiver

VCC = +5V

–5V

+5V

–5V

VSS Storage Capacitor

VDD Storage Capacitor

–

Figure 4. Charge Pump Phase 3.

VCC = +5V

+10V

VSS Storage Capacitor

VDD Storage Capacitor

–

Figure 5. Charge Pump Phase 4.

Table 1. SP502 Drivers

Pin Label

Mode:

RS-232

V.35

RS-422

RS-485

RS-449

EIA-530

TDEC

3–TDEC0

0000

0010

1110

0100

0101

1100

1101

SD(a)

tri–state

RS-232

V.35–

RS-422–

RS-485–

RS-422–

SD(b)

tri–state

V.35+

RS-422+

RS-485+

RS-422+

TR(a)

tri–state

RS-232

RS-422–

RS-485–

RS-422–

TR(b)

tri–state

RS-422+

RS-485+

RS-422+

RS(a)

tri–state

RS-232

RS-422–

RS-485–

RS-422–

RS(b)

tri–state

RS-422+

RS-485+

RS-422+

RL(a)

tri–state

RS-232

RS-422–

RS-485–

RS-423

RL(b)

tri–state

RS-422+

RS-485+

tri–state

LL(a)

tri–state

RS-232

RS-422–

RS-485–

RS-423

LL(b)

tri–state

RS-422+

RS-485+

tri–state

ST(a)

tri–state

RS-232

V.35–

RS-422–

RS-485–

RS-422–

ST(b)

tri–state

V.35+

RS-422+

RS-485+

RS-422+

TT(a)

tri–state

RS-232

V.35–

RS-422–

RS-485–

RS-422–

TT(b)

tri–state

V.35+

RS-422+

RS-485+

RS-422+

power supplies should provide a power

supply sequence of: +l0V, then +5V, followed

by –l0V.

Drivers

The SP502 has six (6) drivers which can be

programmed in six different modes of opera-

tion. One of the drivers for the SP502 is inter-

nally connected to an internal receiver input to

make up a half-duplex configuration. As shown

in the Mode Diagrams, the driver input of the

half-duplex channel is shared with an adjacent

driver such that when one is active the other is

disabled.

Control for the mode selection is done via a

four–bit control word. The SP502 does not have

a latch; the control word must be externally

latched either high or low to write the appropri-

ate code into the SP502. The drivers are pre-

arranged such that for each mode of operation

the relative position and functionality of the

drivers are set up to accommodate the selected

interface mode. As the mode of the drivers is

changed, the electrical characteristics will change

to support the requirements of clock, data, and

control line signal levels. Table 1 shows a sum-

mary of the electrical characteristics of the driv-

ers in the different interface modes. Unused

driver inputs can be left floating; however, to

ensure a desired state with no input signal, pull–

up resistors to +5V or pull–down resistors to

ground are suggested. Since the driver inputs

are both TTL or CMOS compatible, any value

resistor less than 100k

Ω will suffice.

There are three basic types of driver circuits —

RS-232, RS-423, and RS-485. The RS-232 driv-

ers output a minimum of

±5V level single–ended

signals (with 3k

Ω and 2500pF loading), and

*The ST and TT driver outputs cannot be enabled simultaneously.

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