Motorola CMOS Logic, Руководство пользователя, Страница: 456 / 571

MOTOROLA CMOS LOGIC DATA MC14554B
6–418
2-Bit by 2-Bit Parallel
Binary Multiplier
The MC14554B 2 x 2–bit parallel binary multiplier is constructed with
complementary MOS (CMOS) enhancement mode devices. The multiplier
can perform the multiplication of two binary numbers and simultaneously add
two other binary numbers to the product. The MC14554B has two
multiplicand inputs (X0 and X1), two multiplier inputs (Y0 and Y1), five
cascading or adding inputs (K0, K1, M0, M1, and M2), and five sum and
carry outputs (S0, S1, S2, C1 [S3], and C0). The basic multiplier can be
expanded into a straightforward m–bit by n–bit parallel multiplier without
additional logic elements.
Application areas include arithmetic processing (multiplying/adding,
obtaining square roots, polynomial evaluation, obtaining reciprocals, and
dividing), Fast Fourier Transform processing, digital filtering, communica-
tions (convolution and correlation), and process and machine controls.
•
Diode Protection on All Inputs
•
All Outputs Buffered
•
Straight–forward m–Bit By n–Bit Expansion
•
No Additional Logic Elements Needed for Expansion
•
Multiplies and Adds Simultaneously
•
Positive Logic Design
•
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
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
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
PIN ASSIGNMENT
13
14
15
16
9
10
11
12 5
4
3
2
1
8
7
6
K0
X1
X0
Y0
VDD
S1
K1
S0
C0
M1
M0
Y1
VSS
S2
C1 (S3)
M2
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
MC14554B
This device contains protection circuitry to
guard against damage due to high static
voltages or electric fields. However, pre-
cautions must be taken to avoid applications of
any voltage higher than maximum rated volt-
ages to this high–impedance circuit. For proper
operation, Vin and Vout should be constrained
to the range VSS
v
(Vin or Vout)
v
VDD.
Unused inputs must always be tied to an
appropriate logic voltage level (e.g., either VSS
or VDD). Unused outputs must be left open.
L SUFFIX
CERAMIC
CASE 620
ORDERING INFORMATION
MC14XXXBCP Plastic
MC14XXXBCL Ceramic
MC14XXXBD SOIC
TA = – 55
°
to 125
°
C for all packages.
P SUFFIX
PLASTIC
CASE 648
D SUFFIX
SOIC
CASE 751B
S = (X x Y) + K + M
Where:
x Means Arithmetic Times.
+ Means Arithmetic Plus.
S = S3 S2 S1 S0, X = X1X0, Y = Y1Y0,
K = K1 K0, M = M1 M0 (Binary Numbers).
Example:
Given: X = 2(1), Y = 3(11)
K = 1(01), M = 2(10)
Then: S = (2 x 3) + 1 + 2 = 9
S = (10 x 11) + 01 + 10 = 1001
EQUATIONS
NOTE: C0 connected to M2 for this size
multiplier. See general expansion
diagram for other size multipliers.