MC14581B Datasheet, PDF (1/7 Pages) Motorola, Inc – 4-Bit Arithmetic Logic Unit

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 (Cn) and a ripple carry output (Cn+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 Cn+4 output can be used to indicate relative
magnitude as shown in this table:
Data
Level
Active
High
Active
Low
Cn
H
Cn+4
H
Magnitude
vA B
L
H
A<B
H
L
L
L
L
L
w^{A > B}
AB
vA B
H
L
A<B
L
H
H
H
w^{A > B}
AB
• Functional and Pinout Equivalent to 74181.
• Diode Protection on All Inputs
• All Outputs Buffered
• Supply Voltage Range = 3.0 Vdc to 18 Vdc
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{• Capable of Driving Two Low–power TTL Loads or One Low–power}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{Schottky TTL Load over the Rated Temperature Range}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{MAXIMUM RATINGS* (Voltages Referenced to VSS)}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _Symbol
Parameter
Value
Unit
VDD DC Supply Voltage
– 0.5 to + 18.0
V
Vin, Vout Input or Output Voltage (DC or Transient) – 0.5 to VDD + 0.5 V
Iin, Iout Input or Output Current (DC or Transient),
± 10
mA
per Pin
PD Power Dissipation, per Package†
500
mW
Tstg Storage Temperature
– 65 to + 150
_C
TL
Lead Temperature (8–Second Soldering)
260
_C
* 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
©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
MC14581B
L SUFFIX
CERAMIC
CASE 623
P SUFFIX
PLASTIC
CASE 709
DW SUFFIX
SOIC
CASE 751E
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
Plastic
Ceramic
SOIC
TA = – 55° to 125°C for all packages.
PIN ASSIGNMENT
B0 1
A0 2
S3 3
S2 4
S1 5
S0 6
Cn 7
MC 8
F0 9
F1 10
F2 11
VSS 12
24 VDD
23 A1
22 B1
21 A2
20 B2
19 A3
18 B3
17 G
16 Cn+4
15 P
14 A = B
13 F3
MC14581B
1