Need help on old parts??

From: Sipke de Wal <sipke_at_wxs.nl>
Date: Tue Sep 5 19:17:28 2000

This is from the National Semiconductor TTL/DTL databook
from 1976 (Radio Shack edition)

NS lists them as DM946, 949,961,963 being direct replacements for the
SNxxxxx types

These are DTL of either the low power type (6k pullup) or the
normal type (2k pullup) The manual does not state the partnumbers
that are 6k or 2k but this must be evident from your circuit.

Pinouts
DM 946,949 (Same pinout) Quad two-input NAND
Gate1 IN = 1, 2 / OUT=3
Gate2 IN = 4,5 / OUT=6
Gate3 IN = 9,10 / OUT=8
Gate4 IN = 12,13/ OUT=11

DM961 Dual 4-input NAND with extension input (E)
Gate1 IN=1,2,4,5, / E=3 / OUT=6
Gate2 IN=9,10,12,13 / E=11/ OUT=8

DM963 Tripple 3-input NAND
Gate1 IN=1,2,13 / OUT=12
Gate2 IN=3,4,5 / OUT=6
Gate3 IN=9,10,11/ OUT=8

I suspect lead-7 being the GND and lead-14 being the Vcc
but I will not vouch for that. It will be obvious from the circuit.

Good luck

Sipke de Wal

 





----- Original Message -----
From: Dwight Elvey <elvey_at_hal.com>
To: <classiccmp_at_classiccmp.org>
Sent: Tuesday, September 05, 2000 6:25 PM
Subject: Need help on old parts??


> Hi
> I need some pinouts for some old TTL? or DTL? parts
> These are in my computer and I think one of them is
> causing a failure. These are all TI parts:
>
> SN15846
> SN15849
> SN15861
> SN15863
>
> I am especially interested in the
> SN15861 and SN15849.
> Thanks
> Dwight
>
Received on Tue Sep 05 2000 - 19:17:28 BST