SEMICONDUCTOR TECHNICAL DATA
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.
L SUFFIX
CERAMIC
CASE 623
P SUFFIX
PLASTIC
CASE 709
DW SUFFIX
SOIC
CASE 751E
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
ORDERING INFORMATION
inverted ripple carry input (C ) and a ripple carry output (C
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
) are included
n
n+4
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
Plastic
Ceramic
SOIC
T
A
= – 55° to 125°C for all packages.
in the subtract mode the C
magnitude as shown in this table:
output can be used to indicate relative
n+4
PIN ASSIGNMENT
Data
Level
C
C
Magnitude
n
n+4
H
H
L
L
B0
A0
S3
S2
S1
S0
1
2
3
4
5
6
24
23
22
21
20
19
V
DD
Active
High
H
A
B
A1
B1
A2
B2
A3
L
H
L
A < B
A > B
A
B
Active
Low
L
H
L
L
L
H
H
A
B
A < B
A > B
H
A
B
C
7
18
17
16
15
14
13
B3
G
n
•
•
•
•
•
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
MC
F0
F1
F2
8
9
C
P
n+4
10
11
12
A = B
F3
V
SS
MAXIMUM RATINGS* (Voltages Referenced to V
)
SS
Symbol
Parameter
DC Supply Voltage
Value
Unit
V
V
DD
– 0.5 to + 18.0
V , V
Input or Output Voltage (DC or Transient)
– 0.5 to V
DD
+ 0.5
V
in out
I , I
Input or Output Current (DC or Transient),
per Pin
± 10
mA
in out
P
Power Dissipation, per Package†
Storage Temperature
500
mW
C
D
T
stg
– 65 to + 150
260
T
Lead Temperature (8–Second Soldering)
C
L
* 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
REV 3
1/94
Motorola, Inc. 1995
MOTOROLA CMOS LOGIC DATA
MC14581B
1