Re: Help Ram connections !!!!

On Sep 19, 12:24 am, BSL <bsl...@xxxxxxxxxxxx> wrote:
On Sep 18, 12:07 pm, Eeyore <rabbitsfriendsandrelati...@xxxxxxxxxxx>
wrote:



BSL wrote:
Eeyore wrote:
BSL wrote:
Eeyore wrote:
BSL wrote:
Hi Guys , i have to use a 8 bits SRam to fix a 4 bits design , on the
new ram i will have 4 data lines not use ,so Is it safe to leave
these pins floating ??? can the Ram be unstable if they're not pulled
up or down ???

Pull them one way or the other (it doesn't matter which).

Inputs left open/floating may cause various problems.

Would it be a good idea to tie the not use ones with adjacent use
ones ??? let's say d1 tie to d2 !!!

You'll double the input capacitance that way which might be problematic.

The problem i have is that i must do a small adapter boards and don't
want a put many resistors on it !!!

If you're not driving it very fast, then that may be fine.

Why the problem with resistors though ? Couldn't they be small surface mount
types ?

Graham- Hide quoted text -

- Show quoted text -

:-) yes smt are small !!, just wanted to put less parts as possible ,
btw the max speed of the cpu is merely 1 MHz , it is an old slow
system , the ram is a lo power used to keep status while power off , a
memory cap is the power keeper !!!!

Just ground the unused bits. No resistors needed.

.

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