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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
4-Bit Arithmetic Logic Unit
The MC14581B is a CMOS 4–bit ALU capable of providing 16 functions of
two Boolean variables and 16 binary arithmetic operations on two 14–bit
words. The level of the mode control input determines whether the output
function is logic or arithmetic. The desired logic function is selected by
applying the appropriate binary word to the select inputs (S0 thru S3) with
the mode control input high, while the desired arithmetic operation is
selected by applying a low voltage to the mode control input, the required
level to carry in, and the appropriate word to the select inputs. The word
inputs and function outputs can be operated with either active high or active
low data.
Carry propagate (P) and carry generate (G) outputs are provided to allow
a full look–ahead carry scheme for fast simultaneous carry generation for the
four bits in the package. Fast arithmetic operations on long words are
obtainable by using the MC14582B as a second order look ahead block. An
inverted ripple carry input (C n ) and a ripple carry output (C n+4 ) are included
for ripple through operation.
When the device is in the subtract mode (LHHL), comparison of two 4–bit
words present at the A and B inputs is provided using the A = B output. It
assumes a high–level state when indicating equality. Also, when the ALU is
in the subtract mode the C n+4 output can be used to indicate relative
magnitude as shown in this table:
Data
Level
Active
High
Active
Low
Functional and Pinout Equivalent to 74181.
Diode Protection on All Inputs
All Outputs Buffered
Supply Voltage Range = 3.0 Vdc to 18 Vdc
Capable of Driving Two Low–power TTL Loads or One Low–power
Schottky TTL Load over the Rated Temperature Range
Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î
MAXIMUM RATINGS*
(Voltages Referenced to V SS )
Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î
Symbol
Parameter
V DD
DC Supply Voltage
V in , V out
Input or Output Voltage (DC or Transient)
I in , I out
Input or Output Current (DC or Transient),
per Pin
P D
Power Dissipation, per Package†
T stg
Storage Temperature
T L
Lead Temperature (8–Second Soldering)
* Maximum Ratings are those values beyond which damage to the device may occur.
†Temperature Derating:
Plastic "P and D/DW" Packages: – 7.0 mW/ _ C From 65 _ C To 125 _ C
Ceramic "L" Packages: – 12 mW/ _ C From 100 _ C To 125 _ C
MOTOROLA CMOS LOGIC DATA
C n
C n+4
Magnitude
v
H
H
A
B
L
H
A < B
H
L
A > B
w
L
L
A
B
v
L
L
A
B
H
L
A < B
L
H
A > B
w
H
H
A
B
Value
– 0.5 to + 18.0
– 0.5 to V DD + 0.5
500
– 65 to + 150
260
T A = – 55 to 125 C for all packages.
Unit
V
V
10
mA
mW
_ C
_ C
MC14581B
L SUFFIX
CERAMIC
CASE 623
P SUFFIX
PLASTIC
CASE 709
DW SUFFIX
SOIC
CASE 751E
ORDERING INFORMATION
MC14XXXBCP
Plastic
MC14XXXBCL
Ceramic
MC14XXXBDW
SOIC
PIN ASSIGNMENT
B0
1
24
V DD
A0
2
23
A1
3
B1
S3
22
S2
4
21
A2
S1
5
20
B2
S0
6
19
A3
C n
7
18
B3
MC
8
17
G
F0
9
16
C n+4
F1
10
15
P
F2
11
14
A = B
V SS
12
13
F3
MC14581B
6–489
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