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02 Closer Look at ICs

posted Nov 4, 2012, 1:37 AM by Neil Mathew   [ updated Nov 4, 2012, 1:15 AM ]

All The ICs used

> DUAL, QUAD here means how many such components are available in that one IC.

** 74157 IC TTL quad 2-to-1 data selector multiplexer with non-inverted data outputs
(74157 was a unique IC. All four 2:1 MUX had the same select inputs)


IC Number: Name  Where it's used
   
7400
 2-input NAND
 
7402 
 2-input NOR
 
7404
 1-input NOT
 



7408
 2-input AND
 
7432
 2-input OR
 
7486
2-input EXOR 
 
 
 
7483A
4-Bit Binary Full Adder
Adder-Subtractor
Decrementer (add 1111 ~ -1) 
   
74153
Dual 4:1 MUX
 ALU circuit
74157
Quad 2:1 MUX **
 4-bit Shifter
 
 
 
74155
Dual 2:4 DECODER
3:8 Decoder 
Tri State Buffer Bus
 
 
 
74125
Tri-State Buffer 
Tri State Buffer
Tri State Buffer Bus

(CLICK HERE FOR MORE ICs)



ScreenShots of a few good ones


4-bit Full Adder Circuit

Note the last, C0 is the select input (m) or Input Carry. 

Left: A4 A3 A2 A1 B4 B3 B2 B1 C0
Right: C4 SUM4 SUM3 SUM2 SUM1





 DUAL 4:1 MUX
Usually just one 4:1 MUX is used. 
EA' should be supplied 0. 



DUAL 2:4 DECODER
Again, only one of the two decoders is used.
A, B are the Inputs. (Treat as B A as in 1 0 = 2)
G' is the enable (Supply it 0)
C is the store (Supply it 1)




 QUAD 2:1 DATA SELECTOR MUX

STROBE G' (Supply it as 0)
SELECT A'E ( Varying 0 and 1 since its for selection)




Tri State Buffer
Pretty easy this one. 
When C = 1 Output's the same.
When C = 0, Output is Z, due to high impedance (Z).


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