504/505AppNote/03

New SP504/505 Evaluation Board

© Copyright 2000 Sipex Corporation

11

SP504

from

function

to

function

SP505

pin 2

RDEC0

TTL Input

/SDEN

TTL Input

pin 2

pin 3

RDEC1

TTL Input

/TREN

TTL Input

pin 3

pin 4

RDEC2

TTL Input

/RSEN

TTL Input

pin 4

pin 5

RDEC3

TTL Input

/LLEN

TTL Input

pin 5

pin 8

N/C

N/C

/LATCH

TTL Input

pin 8

pin 9

TDEC3

TTL Input

DEC3

TTL Input

pin 9

pin 10

TDEC2

TTL Input

DEC2

TTL Input

pin 10

pin 11

TDEC1

TTL Input

DEC1

TTL Input

pin 11

pin 12

TDEC0

TTL Input

DEC0

TTL Input

pin 12

pin 18

V35_STAT

TTL Output

/RLEN

TTL Input

pin 18

Summary

In the SP504, pins 2-5 control the Mode Input Word used to configure the receivers. Pin 8 is

No Connection and pin 18 is the V35_STAT status notification output which is often used to

control the V.35 150 ohm termination resistor switches. Pins 9-12 are for the driver Mode Input

Word.

In the SP505, the 4 receiver Mode Input Bits and the 4 driver Mode Input Bits are combined into

a single 4 bit Mode Input Word. Pins 2-5 control the ENABLE (active low) function for the drivers

TxD, DTR, RTS & LL, respectively. Pin 8 controls the transparent latch /LATCH (active low)

function, used to latch in the last Mode Input Word. Pin 18 controls the ENABLE (active low)

function for the RL driver. Pins 9-12 control the combined Mode Input Word DEC3, DEC2, DEC1

& DEC0, respectively.

SP504  SP505

Pinout Changes