ITT - Index of

ITT54181.ITT74181
ARITHMETIC LOGIC UNITS/FUNCTION GENERATORS
The ITT54181/1TT74181 is designed with a Darlington
output configuration (54H/74H type) to reduce
the high-logic-level output impedance and
thereby improve the turn-off propagation delay
time. All outputs are rated at a normalized fan-out
of ten at the low logic level and increased to a fanout
of 20 at the high logic level. The increased highlogic-level
fan-out allows the system designer more
freedom in tying unused inputs to driven inputs.
The ITT54181 is characterized for operation over
the full military temperature range of -55°C to
125° C; the ITT74181 is characterized for operation
from O°C to 70°C.
ALU Signal Designations
The ITT54181 and ITT74181 can be used with
either the signal designations as shown in Figures
lor II.
The logic functions and arithmetic operations obtained
with signal designations as in Figure'l are
given in Table I; those obtained with the signal designations
of Figure II are given in Table II.
(7) en
121 (1) 1231 (22) (21H20) (1911181
FIGURE I
(FOR TABLE I)
171
Co
121 (H
12311221 (211(20) (1IH1a)
FIGURE II
(FOR TABLE II)
'"
181
54f14181
114l
(91 nOl nll (131 !l61 1111115)
I I
191 no)
lit) (1711151
I I
Illi
171
(131
nOI
54fl4182
110)
171
1121
Ill)
191
1121
1111 191
TABLE I
Selection
S1 S2 S1 So
M=H
Logic
Functions
L L L L F=A
L L L H F=A+B
L L H L F = AB
L L H H F=O
L H L L F = AB
LH L HF=B
LH H LF=A@B
L H H H F = AS
H L L L F=A+B
H L L H F=AEt>B
H L H L F=B
H L H H F = AB
H H L L F=1 _
H H L H F=A+B
H H H L F=A+B
H H H H F=A
F = A
C = 0 _n
Cn = 1 = H
F = A + B
F= A+ B
F = MINUS 1 (2's COMPL)
F= A PLUSAB
F = (A + B) PLUS AS
F = A MINUS B MINUS 1
F = AB MINUS 1
F = A PLUSAS
F = A PLUS S
F = (A + Bi PLUS AS
F=ASMINUS1
F=APLUSA'
F = (A + B) PLUS A
F = (A + "B"i PLUS A
F = A MINUS 1
• Each bit is shifted to the next more significant position.
Active-High Data
M = L. Arithmetic Operations
F = A PLUS 1
F = (A - S) PLUS 1
F = (A + S) PLUS 1
F = ZERO
F = A PLUS ABPLUS 1
F = (A + S) PLUS AS PLUS 1
F=AMINUSB
F= AS
F = A PLUS AS PLUS 1
F = A PLUS S PLUS 1
F = (A + B) PLUS AB PLUS 1
F = AS
F = A PLUS A PLUS 1
F = (A + B) PLUS A PLUS 1
F = (A + B) PLUS A PLUS 1
F = A
3 - 216