54F182DMQB. National Semiconductor, 54F182DMQB. Datasheet - Page 2

• Manufacturer Part Number: 54F182DMQB.
• Manufacturer: National Semiconductor

Specifications of 54F182DMQB.

• Operating Temperature (max): 125C
• Package Type: CDIP
• Pin Count: 14
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Not Compliant

Unit Loading Fan Out
Functional Description
The ’F182 carry lookahead generator accepts up to four
pairs of Active LOW Carry Propagate (P
Generate (G
(C
C
’F182 also has Active LOW Carry Propagate (P) and Carry
Generate (G) outputs which may be used for further levels
of lookahead The logic equations provided at the outputs
are
C
C
C
G
P
ALUs may be either ’F181 or ’F381
n
n
n
n
C
G
G
G
P
P
P
C
G
P
n
a
a
a
a
Pin Names
) and provides anticipated Active HIGH carries (C
0
2
3
n
n
0
1
3
y
x
y
z
a
P
G
x
1
C
2
b
e
e
e
e
e
n
C
a
G
G
G
G
P
n
z
2
3
0
0
1
2
a
) across four groups of binary adders The
P
–G
a
a
a
a
z
2
P
3
P
1
P
P
P
) signals and an Active HIGH Carry input
3
P
0
1
2
G
0
C
G
G
Carry Input
Carry Generate Inputs (Active LOW)
Carry Generate Input (Active LOW)
Carry Generate Input (Active LOW)
Carry Propagate Inputs (Active LOW)
Carry Propagate Input (Active LOW)
Carry Propagate Input (Active LOW)
Carry Outputs
Carry Generate Output (Active LOW)
Carry Propagate Output (Active LOW)
2
n
0
1
a
a
a
FIGURE 1 32-Bit ALU with Rippled Carry between 16-Bit Lookahead ALUs
P
P
P
3
1
2
P
P
P
2
0
1
G
C
G
1
Description
n
0
a
a
P
P
3
P
2
P
2
P
1
0
P
1
– P
G
0
C
0
3
n
) and Carry
n
a
x
HIGH LOW
2
1 0 14 0
1 0 16 0
50 33 3
50 33 3
50 33 3
1 0 2 0
1 0 8 0
1 0 8 0
1 0 6 0
1 0 4 0
U L
(Figure 1) to and from the ALU to the carry lookahead gen-
Also the ’F182 can be used with binary ALUs in an active
LOW or active HIGH input operand mode The connections
erator are identical in both cases Carries are rippled be-
tween lookahead blocks The critical speed path follows the
circled numbers There are several possible arrangements
for the carry interconnects but all achieve about the same
speed A 28-bit ALU is formed by dropping the last ’F181 or
’F381
54F 74F
20 A
20 A
20 A
20 A
20 A
20 A
20 A
Output I
b
b
b
Input I
1 mA 20 mA
1 mA 20 mA
1 mA 20 mA
b
b
b
b
b
b
b
IH
OH
1 2 mA
8 4 mA
9 6 mA
4 8 mA
4 8 mA
3 6 mA
2 4 mA
I
IL
I
OL
TL F 9492– 5