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74F181 Fiches technique(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce 74F181
Description  4-Bit Arithmetic Logic Unit
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F181 Fiches technique(HTML) 2 Page - National Semiconductor (TI)

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Logic Symbols
Active-HIGH Operands
TLF9491 – 3
Active-LOW Operands
TLF9491 – 4
IEEEIEC
TLF9491 – 10
Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW Output IOH IOL
A0–A3
A Operand Inputs (Active LOW)
1030
20 mA b18 mA
B0–B3
B Operand Inputs (Active LOW)
1030
20 mA b18 mA
S0–S3
Function Select Inputs
1040
20 mA b24 mA
M
Mode Control Input
1010
20 mA b06 mA
Cn
Carry Input
1050
20 mA b30 mA
F0–F3
Function Outputs (Active LOW)
50333
b
1 mA20 mA
A e B
Comparator Output
OC
333
20 mA
G
Carry Generate Output (Active LOW)
50333
b
1 mA20 mA
P
Carry Propagate Output (Active LOW)
50333
b
1 mA20 mA
Cn a 4
Carry Output
50333
b
1 mA20 mA
OC-Open Collector
Functional Description
The ’F181 is a 4-bit high-speed parallel Arithmetic Logic
Unit (ALU) Controlled by the four Function Select inputs
(S0–S3) and the Mode Control input (M) it can perform all
the 16 possible logic operations or 16 different arithmetic
operations on Active HIGH or Active LOW operands The
Function Table lists these operations
When the Mode Control input (M) is HIGH all internal car-
ries are inhibited and the device performs logic operations
on the individual bits as listed When the Mode Control input
is LOW the carries are enabled and the device performs
arithmetic operations on the two 4-bit words The device
incorporates full internal carry lookahead and provides for
either ripple carry between devices using the Cn a 4 output
or for carry lookahead between packages using the signals
P (Carry Propagate) and G (Carry Generate) In the Add
mode P indicates that F is 15 or more while G indicates
that F is 16 or more In the Subtract mode P indicates that F
is zero or less while G indicates that F is less than zero P
and G are not affected by carry in When speed require-
ments are not stringent the ’F181 can be used in a simple
Ripple Carry mode by connecting the Carry output (Cna4)
signal to the Carry input (Cn) of the next unit For high speed
operation the device is used in conjunction with a carry look-
ahead circuit One carry lookahead package is required for
each group of four ’F181 devices Carry lookahead can be
provided at various levels and offers high speed capability
over extremely long word lengths
The AeB output from the device goes HIGH when all four F
outputs are HIGH and can be used to indicate logic equiva-
lence over four bits when the unit is in the Subtract mode
The AeB output is open collector and can be wired AND
with other AeB outputs to give a comparison for more than
four bits The AeB signal can also be used with the Cna4
signal to indicate AlB and AkB
The Function Table lists the arithmetic operations that are
performed without a carry in An incoming carry adds a one
to each operation Thus select code LHHL generates A
minus B minus 1 (2s complement notation) without a carry
in and generates A minus B when a carry is applied Be-
cause subtraction is actually performed by complementary
addition (1s complement) a carry out means borrow thus a
carry is generated when there is no underflow and no carry
is generated when there is underflow As indicated this de-
vice can be used with either active LOW inputs producing
active LOW outputs or with active HIGH inputs producing
active HIGH outputs For either case the table lists the oper-
ations that are performed to the operands labeled inside the
logic symbol
2


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