[SI-LIST] Re: PC Parallel port to 3V3

Ian,

I have used Fairchild's 74LVXZ161284 to interface between a p.c.'s 
parallel port and an 
FPGA's 3.3V I/O.  The device is a bidirectional translating transceiver 
that has 5V tolerant
inputs as well as separate vcc_cable supply pins that allow the outputs on 
the cable side
to be driven by a higher supply voltage.

The 74LVXZ161284 also has a power-up protection feature and internal 
termination for the cable:
http://www.fairchildsemi.com/pf/74/74LVXZ161284.html

There is also a 74LVX161284 "no Z" that is essentially the same device 
without the power-up 
protection feature:
http://www.fairchildsemi.com/pf/74/74LVX161284.html

Sincerely,
Chris





"Robert Plant" <rplantsprint@xxxxxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
03/27/03 06:20 AM
Please respond to rplantsprint

 
        To:     <ilewis@xxxxxxxxxxxxxx>, "SI List (E-mail)" 
<si-list@xxxxxxxxxxxxx>
        cc: 
        Subject:        [SI-LIST] Re: PC Parallel port to 3V3



Hello Ian,

I've used the following buffer IC from TI for parallel port interface
applications:
74LVC16245A

It handles two banks of 8-bits, can drive or receive on either bank
(bi-directional)
and operates at 1.8V to 3.3V.  Its inputs are also 5V compliant, which 
makes
it nice
for interfacing with the parallel port.

You'll need to verify whether the number of pins are sufficient for your 
DSP
(probably
so is my guess.)

Regards,
Drew

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ian Lewis
Sent: Thursday, March 27, 2003 2:17 AM
To: SI List (E-mail)
Subject: [SI-LIST] PC Parallel port to 3V3



Hello everyone,

I would like to interface a microprocessor bus running from 3.3V to a PC
parallel port. The parallel port outputs on my PC seems to be more-or-less
5V levels. I haven't tried putting a voltage source in and reading the 
port,
but as there are bound to be lots of different implementations of the 
port,
I wouldn't want to assume that mine is representative. Has anyone tried to
do this in an application? (successfully or otherwise...) What kind of
buffering did you use?

The bus in question is actually the HPI of a Texas Instruments 55x DSP, in
case anyone's interested.

Thanks in advance,

Ian.

Ian Lewis
Applied Technology UK Ltd

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