19 Sep
2013
19 Sep
'13
10:30 a.m.
Hi Pete,
No, that's wrong. 7438 guarantees 48mA, still a
little under spec, but
close, and the gates are the wrong way round.
--- I suppose you're basically right, but the TI datasheet doesn't specify the
output voltage at that current. It shows 48mA as being the maximum recommended sink
current, which certainly guarantees being free from damage at that level. The only spec I
find which guarantees the output voltage specifies just 16mA. I conservatively went with
that figure. In contrast, the 7439 datasheet does specify output voltage at 48, 60 and
80mA.
Steve Lafferty
20 Sep
20 Sep
12:36 a.m.
On 19/09/2013 18:30, Steve Lafferty wrote:
--- I suppose you're basically right, but the TI
datasheet doesn't
specify the output voltage at that current. It shows 48mA as being
the maximum recommended sink current
Maybe it depends on the data sheet or data book you're looking at, but
mine (Texas TTL Data Book 5th ed.) clearly states for 7433 and 7438, Iol
max 48mA and then Vol max @ Iol=max 0.4V.
--
Pete Peter Turnbull
Network Manager
University of York
4111
days inactive
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