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Part: 74F381
Category:
Logic
-> Arithmetic Functions
-> Bipolar->F Family
Description: Arithmetic Logic Unit
Company: Philips Semiconductors
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Philips Semiconductors
Product specification
Arithmetic Logic Unit
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
PIN CONFIGURATION
A1 1 B1 2 A0 3 B0 4 S0 5 20 V CC 19 A2 18 B2 17 A3 16 B3 15 Cn 14 P 13 G 12 F3 11 F2
DESCRIPTION
The 74F381 performs three arithmetic and three logic operations on two 4-bit words, A and B. Three additional Select (S0S2) 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 (S0S2) 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.
S1 6 S2 7 F0 8
F1 9 GND 10
SF00921
TYPE 74F381
TYPICAL PROPAGATION DELAY 6.5ns
TYPICAL SUPPLY CURRENT (TOTAL) 59mA
ORDERING INFORMATION
DESCRIPTION 20-pin plastic DIP 20-pin plastic SO COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F381N N74F381D
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS A0 A3 B0 B3 S0 S2 Cn P G A operand inputs A operand inputs Function select inputs Carry input Carry Propagate ouptut (active-Low) Carry Generate ouptut (active-Low) DESCRIPTION 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
F0F3 Outputs NOTE: One (1.0) FAST unit load is defined as 20µA in the High state and 0.6mA in the Low state.
1989 Mar 01
1
8530418 95907
Philips Semiconductors
Product specification
Arithmetic Logic Unit
74F381
LOGIC SYMBOL
3 4 1 2 19 18 17 16
IEC/IEEE SYMBOL
5 6 7 A0 B0 A1 B1 A2 B2 A3 B3 15 Cn S0 S1 S2 F0 F1 F2 F3 G P 13 14 3 4 1 2 19 4 (1/2) Bl 3 Cl 0 M 0 7 ALU (1/2/3) CP (1/2/3) CG 14 13
15 5 6 7
P Q P Q P Q P Q [1]
8
[2]
9
VCC = Pin 20 GND = Pin 10
8
9
11 12
SF00922
18 17 16
[4]
11
[8]
12
SF00923
1989 Mar 01
2
Philips Semiconductors
Product specification
Arithmetic Logic Unit
74F381
LOGIC DIAGRAM
Cn 15
A0
3
8
F0
B0 A1
4
1
9
F1
B1
2
A2
19
11 F2
B2
18
A3
17
12
F3
14 P B3 16
13 S0 5
G
S1
6
7 S2 VCC = Pin 20 GND = Pin 10
SF00924
1989 Mar 01
3
Philips Semiconductors
Product specification
Arithmetic Logic Unit
74F381
FUNCTION TABLE
INPUTS S0 L H H H H H H H H L L L L L L L L H H H H H H H H L L L L H H H H L L L L H H H H S1 L L L L L L L L L H H H H H H H H H H H H H H H H L L L L L L L L H H H H H H H H S2 L L L L L L L L L L L L L L L L L L L L L L L L L H H H H H H H H H H H H H H H H Cn X L L L L H H H H L L L L H H H H L L L L H H H H X X X X X X X X X X X X X X X X An X L L H H L L H H L L H H L L H H L L H H L L H H L L H H L L H H L L H H L L H H Bn X L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H F0 L H L L H L H H L H L L H L H H L L H H L H L L H L H H L L H H H L L L H H H H H F1 L H H L H L H L L H L H H L L H L L H H H L L L H L H H L L H H H L L L H H H H H OUTPUTS F2 L H H L H L H L L H L H H L L H L L H H H L L L H L H H L L H H H L L L H H H H H F3 L H H L H L H L L H L H H L L H L L H H H L L L H L H H L L H H H L L L H H H H H G L H L H H H L H H H H L H H H L H H H H L H H H L H H H L H H H H L H L H H H H H P L L L H L L L H L L H L L L H L L H L L L H L L L H H L L H H H L L H L L H H H L Preset AB A+B A B A Plus B A minus B B minus A OPERATING MODE Clear
H = High voltage level L = Low voltage level X = Don't care
1989 Mar 01
4
Philips Semiconductors
Product specification
Arithmetic Logic Unit
74F381
FUNCTION SELECT TABLE
SELECT S0 L H L H L H L S1 L L H H L L H S2 L L L L H H H H OPERATING MODE Clear B minus A A minus B A Plus B A AB Preset B A+B
Table 1. 16-Bit Delay Tabulation
PATH SEGMENT Ai or Bi to P Pi to Cn+i (74F182) Cn to F Cn to Cn+4, OVR Total Delay TOWARD F 7.2ns 6.2ns 8.1ns 21.5ns OUTPUT Cn+4, OVR 7.2ns 6.2ns 8.0ns 21.4ns
H H H = High voltage level L = Low voltage level
APPLICATION
A0A3 B0B3 A4A7 B4B7 A8A11 B8B11 A12A15 B12B15
4 A CIN Cn S F 3 SELECT 3 F0F3 G0 Cn 74F381 Q B
4 A Cn S P 3 F
4 B
4 A Cn
4 B
4 A Cn
4 B
4
Cn+4 74F382
COUT OVERFLOW
74F381 Q P 3
S F
74F381 Q P 3
S F
OVR
F4F7 P0 Cn+x G1 P1 Cn+y
F8F11 G2 P2 Cn+z
F12F15
74F182
SF00925
Figure 1. 16-bit Look-ahead Carry ALU Expansion
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 VCC VIN IIN VOUT IOUT Tamb TSTG Supply voltage Input voltage Input current Voltage applied to output in High output state Current applied to output in Low output state Operating free-air temperature range Storage temperature range PARAMETER RATING 0.5 to +7.0 0.5 to +7.0 30 to +1 0.5 to VCC 40 0 to +70 65 to +150 UNIT V V mA V mA
°C °C
1989 Mar 01
5
Others parts begin by 74
74-1 74-2 74-3 74-4 74-5 74-6 74-7 74-8 74-9 74-10 74-11 74-12 74-13 74-14 74-15 74-16 74-17 74-18 74-19 74-20 74-21 74-22 74-23 74-24 74-25 74-26 74-27 74-28 74-29 74-30 74-31 74-32 74-33 74-34 74-35 74-36 74-37 74-38 74-39 74-40 74-41 74-42 74-43 74-44 74-45 74-46 74-47 74-48 74-49 74-50 74-51 74-52 74-53 74-54 74-55 74-56 74-57 74-58 74-59 74-60 74-61 74-62
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