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MC14581B 数据表(PDF) 1 Page - Motorola, Inc

部件名 MC14581B
功能描述  4-Bit Arithmetic Logic Unit
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制造商  MOTOROLA [Motorola, Inc]
网页  http://www.freescale.com
标志 MOTOROLA - Motorola, Inc

MC14581B 数据表(HTML) 1 Page - Motorola, Inc

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MOTOROLA CMOS LOGIC DATA
1
MC14581B
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
Cn
Cn+4
Magnitude
Active
High
H
L
H
L
H
H
L
L
A
v B
A < B
A > B
A
w B
Active
Low
L
H
L
H
L
L
H
H
A
v B
A < B
A > B
A
w B
• 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
MAXIMUM RATINGS* (Voltages Referenced to VSS)
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),
per Pin
± 10
mA
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
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
© Motorola, Inc. 1995
REV 3
1/94
MC14581B
L SUFFIX
CERAMIC
CASE 623
ORDERING INFORMATION
MC14XXXBCP
Plastic
MC14XXXBCL
Ceramic
MC14XXXBDW
SOIC
TA = – 55° to 125°C for all packages.
P SUFFIX
PLASTIC
CASE 709
DW SUFFIX
SOIC
CASE 751E
PIN ASSIGNMENT
S0
S2
S3
A0
B0
MC
Cn
S1
B2
A2
B1
A1
VDD
P
Cn+4
G
5
4
3
2
1
10
9
8
7
6
14
15
16
17
18
19
20
13
11
12
21
22
23
24
F3
A = B
B3
A3
F2
VSS
F1
F0


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