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What is N74F381D?

This electronic component, produced by the manufacturer "Philips", performs the same function as "Arithmetic Logic Unit".


N74F381D Datasheet PDF - Philips

Part Number N74F381D
Description Arithmetic Logic Unit
Manufacturers Philips　
Logo Philips Logo　


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Philips Semiconductors
Arithmetic Logic Unit
Product specification
74F381
FEATURES
• Low-input loading minimizes drive requirements
• Performs six arithmetic and logic functions
• Selectable Low (clear) and High (preset) functions
• Carry Generate and Propagate outputs for use with Carry
look-ahead generator
DESCRIPTION
The 74F381 performs three arithmetic and three logic operations on
two 4-bit words, A and B. Three additional Select (S0–S2) input
codes force the Function outputs Low or High. Carry Propagate (P)
and Generate (G) ouputs are provided for use with the 74F182
Carry Look Ahead Generator for high-speed expansion to longer
word lengths. For ripple expansion, refer to the 74F382 ALU data
sheet.
Signals applied to the Select inputs (S0–S2) determine the mode of
operation, as indicated in the Function Select Table. An extensive
listing of input and output function levels is shown in the Function
Table. The circuit performs the arithmetic functions for either
active-HIgh or active-Low operands, with output levels in the same
convention. In the subtract operating modes, it is necessary to force
a Carry (High for active-HIgh operands, Low for active-Low
operands) into the Cn input of the least significant package. The
Carry Generate (G) and Carry Propagate (P) outputs supply input
signals to the 74F182 Carry look-ahead generator for expansion to
longer word length, as shown in Figure 1. Note that a 74F382 ALU is
used for the most significant package. Typical delays for Figure 1
are given in Table 1.
PIN CONFIGURATION
A1 1
B1 2
A0 3
B0 4
S0 5
S1 6
S2 7
F0 8
F1 9
GND 10
20 VCC
19 A2
18 B2
17 A3
16 B3
15 Cn
14 P
13 G
12 F3
11 F2
SF00921
TYPE
74F381
TYPICAL
PROPAGATION
DELAY
6.5ns
TYPICAL SUPPLY
CURRENT (TOTAL)
59mA
ORDERING INFORMATION
DESCRIPTION
20-pin plastic DIP
COMMERCIAL RANGE
VCC = 5V ±10%, Tamb = 0°C to +70°C
N74F381N
20-pin plastic SO
N74F381D
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
A0 – A3
A operand inputs
B0 – B3
A operand inputs
S0 – S2
Function select inputs
Cn Carry input
P Carry Propagate ouptut (active-Low)
G Carry Generate ouptut (active-Low)
F0–F3
Outputs
NOTE:
One (1.0) FAST unit load is defined as 20µA in the High state and 0.6mA in the Low state.
74F (U.L.)
HIGH/LOW
1.0/4.0
1.0/4.0
1.0/1.0
1.0/4.0
50/33
50/33
50/33
LOAD VALUE
HIGH/LOW
20µA/2.4mA
20µA/2.4mA
20µA/0.6mA
20µA/2.4mA
1.0mA/20mA
1.0mA/20mA
1.0mA/20mA
1989 Mar 01
1 853–0418 95907

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N74F381D equivalent
Philips Semiconductors
Arithmetic Logic Unit
Product specification
74F381
FUNCTION SELECT TABLE
SELECT
S0 S1 S2
L LL
H LL
L HL
H HL
L LH
H LH
L HH
HH
H = High voltage level
L = Low voltage level
H
OPERATING
MODE
Clear
B minus A
A minus B
A Plus B
AęB
A+B
AB
Preset
APPLICATION
A0–A3 B0–B3
A4–A7 B4–B7
Table 1. 16-Bit Delay Tabulation
PATH SEGMENT
TOWARD
F
Ai or Bi to P
7.2ns
Pi to Cn+i (74F182)
6.2ns
Cn to F
8.1ns
Cn to Cn+4, OVR
–
Total Delay
21.5ns
A8–A11 B8–B11
A12–A15 B12–B15
OUTPUT
Cn+4, OVR
7.2ns
6.2ns
–
8.0ns
21.4ns
CIN
SELECT
44
AB
Cn
S 74F381
FQ P
3
3
F0–F3
44
AB
Cn
S 74F381
FQ P
3
F4–F7
44
AB
Cn
S 74F381
FQ P
3
F8–F11
44
AB
Cn Cn+4
S 74F382
F
3
OVR
F12–F15
G0 P0
Cn
Cn+x
G1 P1 Cn+y
74F182
G2 P2 Cn+z
COUT
OVERFLOW
Figure 1. 16-bit Look-ahead Carry ALU Expansion
SF00925
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free-air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
VCC
VIN
IIN
VOUT
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
–0.5 to +7.0
–0.5 to +7.0
–30 to +1
–0.5 to VCC
V
V
mA
V
IOUT
Current applied to output in Low output state
40 mA
Tamb
TSTG
Operating free-air temperature range
Storage temperature range
0 to +70
–65 to +150
°C
°C
1989 Mar 01
5


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Featured Datasheets

Part NumberDescriptionMFRS
N74F381DThe function is Arithmetic Logic Unit. PhilipsPhilips
N74F381NThe function is Arithmetic Logic Unit. PhilipsPhilips

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