On Oct 1 2004, 11:06, Dwight K. Elvey wrote:
> Hi
> I'm looking for a spec sheet on a 8308. I think it
> is part of the older National Semi series DM8308.
> It might be a 8303 ( the schematic is not to clear ).
> I think it is an inverting 8 channel bus tranceiver.
> I need information on which way the drivers go with
> the direction control and is the enable true or false.
I think you mean DP8303 / DP8308? Both of these are 20-pin DIL 8-bit
bidirectional transceivers; the DP8303 is inverting and the DP8308 is
non-inverting. In both cases, the A port is pins 1-8, and the
corresponding B port pins are 19-12.
On the DP8303 (and DP8304, which is the non-invering equivalent) Chip
Disable (active high to disable) is pin 9; pin 11 is Transmit/-Receive;
"transmit" (pin 11 high) means A is input and B is output.
On the DP8308 (and DP8307, the inverting equivalent), pin 9 is
-Transmit and 11 is -Receive (both active low).
On all of them, port A can sink up to 16mA and port B can sink up to
48mA.
The DP7303/4/7/8 devices are extended-temperature range versions of
DP8303/4/7/8.
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sat Oct 02 2004 - 04:07:34 BST