spec sheet for a 8308 - test-drb@ccmp.vtda.org

1 Oct 2004

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