Heathkit IO-4550 - Page 47

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Gegurmarrrrire Page 45
Integrated Circuits (cont’d.)
INTEGRATED
HEATH
MAY
BE
DESCRIPTION
LEAD
CONFIGURATION
CIRCUITS
PART
NUMBER
|
REPLACED
BY
(TOP
VIEW)
4B
4A
4Y 3B 3A 3Y
QUADRUPLE
2-INPUT
POSITIVE-
NAND GATES
1C202,
1C208
1c204,
SN7400N
AND-GATED J-K
MASTER-SLAVE
FLIP-FLOPS
WITH PRESET
AND CLEAR
SN7472N
1Q 10 GND 2K 2Q
20
DUAL J-K
FLIP-FLOPS
WITH PRESET
AND CLEAR
1C 203 1 443-16 SN7476N
1CK 1PR lJ 2CK 2PR
Vcc
1
CLR
Rext/
vec Cext nc Cext nc Rint Q
RETRIGGERABLE
MONOSTABLE
MULTIVIBRATORS
WITH CLEAR
(C205, 1€206 SN74122N