Heathkit H9 Manual page 77

Integrated Circuits (cont'd.)
HEATH PART
NUM BER
MAY BE
REPLACED
WITH
DESCRIPTION
IDENTIFICATION
443-22
74121
MONOSTABLE MULTIVIBRATOR
Re x l/
v CC
r ,l C N C C ex t C ex t Ri nt
N C
NC AI A2
B
Q GN D
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
IN PU IS IN PUTS
/ji^ft-kA;\
ouTpuTs fo'AD j-fiATi-f
9A I A ULE At r
vcce6 6il6 ili FfrI?cD
D ATA 0 n 0 a C0 UN 1 C OU\I 0 c On G l\ D
B
*rJ DOWN UP
'-ar:
INPUT INPUTS
\-----vJ
INPUTS
OUTPUTS
CT EAR BO R RO W CAR RY L O AD
COUNT COUNT
o A
D ow N uP
o6