74F381 Datasheet, PDF (5/7 Pages) NXP Semiconductors – Arithmetic Logic Unit

Philips Semiconductors
Arithmetic Logic Unit
Product specification
74F381
FUNCTION SELECT TABLE
SELECT
S0
S1
S2
L
L
L
H
L
L
L
H
L
H
H
L
L
L
H
H
L
H
L
H
H
H
H
H
H = High voltage level
L = Low voltage level
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
C_IN
SELECT
4
4
A
B
Cn
S ^74F381
FQ P
3
3
F0–F3
4
4
A
B
Cn
S ^74F381
FQ P
3
F4–F7
4
4
A
B
Cn
S ^74F381
FQ P
3
F8–F11
4
4
A
B
Cn
Cn+4
S ^74F382
F
3
OVR
F12–F15
G0 P0
Cn
Cn+x
G1 P1 Cn+y
74F182
G2 P2 Cn+z
C_OUT
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
V_CC
V_IN
I_IN
V_OUT
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
–0.5 to +7.0
V
–0.5 to +7.0
V
–30 to +1
mA
–0.5 to V_CC
V
I_OUT
Current applied to output in Low output state
40
mA
T_amb
T_STG
Operating free-air temperature range
Storage temperature range
0 to +70
°C
–65 to +150
°C
1989 Mar 01
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