Heathkit H9 - Page 77

Integrated
Circuits
(cont'd.)
HEATH PART
NUMBER
MAY BE
REPLACED
WITH
DESCRIPTION
IDENTIFICATION
443-22
74121
MONOSTABLE
MULTIVIBRATOR
Rexl/
vCC
r,lC NC Cext Cext
Rint NC
NC
AI
A2
B
Q GND
443-26
74S00
QUADRUPLE 2-INPUT
POSITIVE.NAND
GATE
IA IB
443-46
7402
QUADRUPLE
2-INPUT
POSITIVE-NOR
GATE
443-612
74193
SYNCHRONOUS UP/DOWN
DUAL CLOCK COUNTER
BINARY WITH
CLEAR
INPUIS
INPUTS
/ji^ft-kA;\
ouTpuTs
fo'AD
j-fiATi-f
9AIA ULEAtr
vcce66il6iliFfrI?cD
DATA 0n 0a
C0UN1
COU\I
0c On Gl\D
B
*rJ DOWN
UP
'-ar:
INPUT INPUTS
\-----vJ
INPUTS
OUTPUTS
CTEAR
BORROW
CARRY
LOAD
COUNT COUNT
oA
DowN uP
o6