13 Mar
2005
13 Mar
'05
10:35 a.m.
Does anyone have a pinout for the Signetics 82S83 BCD full-adder chip (16
pin DIL package)? A google search didn't turn up anything useful that I
could see.
All I can find is a comment in the 74F583 data sheet (which I have) that
said chip is functionally identical to the 82S83. But that doesn't
necessarily mean the same pinout (although, of course, telling me that
those 2 chips are the same pinout would be enough to let me get on).
FWIW, this chip is used in the high-speed language processor option for
the HP9845 (which is what I am currently working on), so it's on-topic here.
-tony
13 Mar
13 Mar
11:49 a.m.
Tony wrote:
Does anyone have a pinout for the Signetics 82S83 BCD
full-adder chip (16
pin DIL package)? A google search didn't turn up anything useful that I
could see.
Happened to have the relevant data book less than three feet from where
I'm sitting.
------ ------
B2 | 1 u 16 | Vcc
B4 | 2 15 | A4
B8 | 3 14 | A2
A8 | 4 13 | A1
Cin | 5 12 | B1
Cout | 6 11 | S1
S4 | 7 10 | S2
GND | 8 9 | S8
-------------
Max prop delay from An, Bn, Cin to Sn is 35 ns.
Max prop delay from An, Bn to Cout is 40 ns.
Max prop delay from Cin to Cout is 25 ns.
Although the pinout wouldn't match, in a pinch you could replace
an 82S83 with a suitably pogrammed 512*8 25ns PROM.
The 82S82 is similar but can also subtract, has an A=B output,
and has G and P outputs for lookahead carry. It's in a 24-pin
package.
Eric
3:46 p.m.
Tony wrote:
Thanks
Does anyone have a pinout for the Signetics 82S83
BCD full-adder chip (16
pin DIL package)? A google search didn't turn up anything useful that I
could see.
Happened to have the relevant data book less than three feet from where
I'm sitting.
------ ------
B2 | 1 u 16 | Vcc
B4 | 2 15 | A4
B8 | 3 14 | A2
A8 | 4 13 | A1
Cin | 5 12 | B1
Cout | 6 11 | S1
S4 | 7 10 | S2
GND | 8 9 | S8
-------------
Assuming you've numbered the pins with their bit-values rather than the
bit-number (which is what is done in the 74F583 data sheet), then the
pinout _is_ the same as the 74F583, altough the latter is much faster.
I am not suprised. I had already found what looked like a carry chain
linking pin 6 on one chip to pin 5 on the next...
[...]
The 82S82 is similar but can also subtract, has an A=B
output,
and has G and P outputs for lookahead carry. It's in a 24-pin
package.
Sounds similar to the 74F582. Maybe even the same pinout
Thanks again for the data
-tony
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ard＠p850ug1.demon.co.uk -
eric＠brouhaha.com