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74F182SJ 데이터시트(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 74F182SJ
상세설명  Carry Lookahead Generator
Download  8 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F182SJ 데이터시트(HTML) 2 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
Cn
Carry Input
1020
20 mA b12 mA
G0 G2
Carry Generate Inputs (Active LOW)
10140
20 mA b84 mA
G1
Carry Generate Input (Active LOW)
10160
20 mA b96 mA
G3
Carry Generate Input (Active LOW)
1080
20 mA b48 mA
P0 P1
Carry Propagate Inputs (Active LOW)
1080
20 mA b48 mA
P2
Carry Propagate Input (Active LOW)
1060
20 mA b36 mA
P3
Carry Propagate Input (Active LOW)
1040
20 mA b24 mA
CnaxbCnaz
Carry Outputs
50333
b
1 mA20 mA
G
Carry Generate Output (Active LOW)
50333
b
1 mA20 mA
P
Carry Propagate Output (Active LOW)
50333
b
1 mA20 mA
Functional Description
The ’F182 carry lookahead generator accepts up to four
pairs of Active LOW Carry Propagate (P0–P3) and Carry
Generate (G0–G3) signals and an Active HIGH Carry input
(Cn) and provides anticipated Active HIGH carries (Cn a x
Cnay Cnaz) across four groups of binary adders The
’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
Cnax e G0 a P0Cn
Cnay e G1 a P1G0 a P1P0Cn
Cnaz e G2 a P2G1 a P2P1G0 a P2P1P0Cn
G
e
G3 a P3G2 a P3P2G1 a P3P2P1G0
P
e
P2P2P1P0
Also the ’F182 can be used with binary ALUs in an active
LOW or active HIGH input operand mode The connections
(Figure 1) to and from the ALU to the carry lookahead gen-
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
TLF9492 – 5
FIGURE 1 32-Bit ALU with Rippled Carry between 16-Bit Lookahead ALUs
ALUs may be either ’F181 or ’F381
2


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