Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

7-seg decoder/driver

0 views
Skip to first unread message

John Schuch

unread,
Jan 18, 1993, 10:16:13 AM1/18/93
to
Is anyone aware of a binary to 7-segment display decoder/driver integrated
circuit which understands hexidecimal? I know it could be done with a PAL
or a ROM but I have no programming equipment.

John

--
+--------------------------------------------------------------------------+
| John R. Schuch - Motorola Computer Group - Manufacturing Engineering |
| N7XVS - sch...@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+

Tim Deagan

unread,
Jan 18, 1993, 11:11:09 AM1/18/93
to
In article 26...@phx.mcd.mot.com, sch...@phx.mcd.mot.com (John Schuch) writes:
>Is anyone aware of a binary to 7-segment display decoder/driver integrated
>circuit which understands hexidecimal? I know it could be done with a PAL
>or a ROM but I have no programming equipment.

You bet! The TIL-311 from TI is just exactly what you are looking for.
Even better, in a smaller package from HP is the 4N51 thru 4N54 and
HDSP-078X, HDSP-079X, HDSP-088X and HDSP-098X (designating various
colors, brightness, etc.)

All of these cost around $9-$10 a pice in small lots, but they are
great to work with.

the TI chip is great, but watch out for lawsuits!

--Tim

ti...@fenian.dell.com-My employer is_not responsible for_this.
/ / | | / || \ / | __ | _ \ / || \ | ||__ /
***\ \*| |___*/ /_|| \/ |*|__|*| |_) )/ /_|| |\| |*/ /_***
/_/ |____//_/|_||_|\/|_| |____//_/|_||_| \_|/____|

Joel Kolstad

unread,
Jan 18, 1993, 2:25:17 PM1/18/93
to
In article <1993Jan18.1...@phx.mcd.mot.com> sch...@phx.mcd.mot.com (John Schuch) writes:
>Is anyone aware of a binary to 7-segment display decoder/driver integrated
>circuit which understands hexidecimal? I know it could be done with a PAL
>or a ROM but I have no programming equipment.

There is a circuit to do this, but I don't know what the number is off
hand.

However, you should consider a PROM such as a 74S188 -- 32x8. You don't
really need any programming equipment -- just a few power supplies, a few
DIP switches for setting the address and data, and a push button switch for
pulsing (and perhaps the 7-seg display or LEDs for verifying the data).
This is a _very_ crude method of programming, and you have to be sure you
don't screw it up, because you only get one chance, but it _does_ work. :-)

I programmed about 4 32x8 PROMs this way, before getting real equipment. I
screwed up about 3 in making those 4, so make sure you buy extra PROMs.

---Joel Kolstad

0 new messages