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