mc14560b Freescale Semiconductor, Inc, mc14560b Datasheet - Page 8

• Manufacturer Part Number: mc14560b
• Description: Nbcd Adder
• Manufacturer: Freescale Semiconductor, Inc

SUMMARY
numbers, addition, and complement subtraction were dis-
cussed in detail. Using the basic Adder and Complementer
MSI blocks, adder/subtracters for both signed and unsigned
numbers were illustrated with examples.
MC14560B
8
The concepts of binary code representations for decimal
LSD
ADD/SUBTRACT
C in
C
(“1”/“0”)
A1
SUBTRACT
Figure 7. Adder/Subtracter for Unsigned NBCD Numbers
BLOCK
BASIC
R1
B1
C out
Typical Add/Subtract Time = 0.6 + 0.4 n s
1/6 MC14572
1/6 MC14572
C in
C
where n = Number of Decades
A2
OVERFLOW = “1”
R2
REFERENCES
1. Chu, Y.: Digital Computer Design Fundamentals , New
2. McMOS Handbook , Motorola Inc., 1st Edition.
3. Beuscher, H.: Electronic Switching Theory and Circuits ,
4. Garrett, L.: CMOS May Help Majority Logic Win De-
5. Richards, R.: Digital Design , New York, Wiley–
B2
C out
York, McGraw–Hill, 1962.
New York, Van Nostrand Reinhold, 1971.
signer’s Vote, Electronics , July 19, 1973.
Interscience, 1971.
MSD
(NEGATIVE RESULT)
C in
C
UNDERFLOW = “1”
A n
MOTOROLA CMOS LOGIC DATA
R n
B n
C out