MC5474F181 Datasheet, PDF (5/5 Pages) Motorola, Inc – 4-BIT ARITHMETIC LOGIC UNIT

MC54/74F181
FUNCTION TABLE
Mode Select
Inputs
Active-LOW Operands
& Fn Outputs
Active-HIGH Operands
& Fn Outputs
Logic Arithmetic**
S3 S2 S1 S0 (M = H) (M = L) (Cn = L)
Logic Arithmetic**
(M = H) (M = L) (Cn = H)
L L L LA
A minus 1
L L L H AB
AB minus 1
L L H L A + B AB minus 1
L L H H Logic 1 minus 1
A
A+B
AB
Logic 0
A
A+B
A+B
minus 1
L H L L A + B A plus (A + B)
L H L HB
AB plus (A + B)
L H H L A ⊕ B A minus B minus 1
L H H H A+B A+B
AB
B
A⊕B
AB
A plus AB
(A + B) plus AB
A minus B minus 1
AB minus 1
H L L L AB
A plus (A + B)
H L L H A ⊕ B A plus B
H L H LB
AB plus (A + B)
H L H H A+B A+B
A+B
A⊕B
B
AB
A plus AB
A plus B
(A + B) plus AB
AB minus 1
H H L L Logic 0 A plus A*
H H L H AB
AB plus A
H H H L AB
AB minus A
H H H HA
A
*Each bit is shifted to the next more significant position.
**Arithmetic operations expressed in 2s complement notation.
Logic 1
A+B
A+B
A
A plus A*
(A + B) plus A
(A + B) plus A
A minus 1
H = HIGH Voltage Level
L = LOW Voltage Level
FAST AND LS TTL DATA
4-96