參數(shù)資料
型號(hào)： 74F182
廠商： National Semiconductor Corporation
英文描述： Carry Lookahead Generator
中文描述： 超前進(jìn)位發(fā)生器
文件頁(yè)數(shù)： 1/6頁(yè)
文件大?。?/td> 56K
代理商： 74F182
Philips Semiconductors
Product specification
74F182
Look-ahead carry generator
2
1991 Apr 15
853–1161 02162
FEATURES
Provides carry look-ahead across a group of four ALUs
Multi-level look-ahead for high speed arithmetic operation over
long word lengths
DESCRIPTION
The 74F182 is a high speed carry look-ahead generator. It accepts
up to four pairs of active-Low Carry Propagate (P0, P1, P2, P3) and
Carry Generate (G0, G1, G2, G3) signals and an active-High Carry
input (Cn) and provides anticipated active-High carries (Cn+x, Cn+y,
Cn+z) across four groups of binary adders. The 74F182 also has
active-Low Carry Propagate (P) Carry Generate (G) outputs which
may be used for further levels of look-ahead.
The logic equations provided at the outputs are:
Cn+x = G0+P0Cn
Cn+y = G1+P1G0+P1P0Cn
Cn+z = G2+P2G1+P2P1G0+P2P1P0Cn
G = G3+P3G2+P3P2G1+P3P2P1G0
P = P3P2P1P0
The 74F182 can also be used with binary ALUs in an active-Low or
active-High input operand mode. The connections to and from the
ALU to the carry look-ahead generator are identical in both cases.
PIN CONFIGURATION
16
15
14
13
12
11
10
7
6
5
4
3
2
1
P
V
CC
Cn+x
Cn+y
G
Cn
P2
G2
G1
P1
P3
G0
P0
G3
9
8
GND
Cn+z
SF00725
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F182
5.0ns
21mA
ORDERING INFORMATION
DESCRIPTION
ORDER CODE
COMMERCIAL RANGE
V
CC
= 5V
±
10%, T
amb
= 0
°
C to +70
°
C
N74F182N
16-pin plastic DIP
16-pin plastic SO
N74F182D
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74FAST (U.L.) HIGH/LOW
LOAD VALUE HIGH/LOW
Cn
Carry input
2.5/2.0
50
μ
A/1.2mA
50
μ
A/8.4mA
50
μ
A/9.6mA
50
μ
A/4.8mA
50
μ
A/4.8mA
50
μ
A/3.6mA
50
μ
A/2.4mA
G0, G2
Carry generate inputs (active-Low)
2.5/14.0
G1
Carry generate input (active-Low)
2.5/16.0
G3
Carry generate input (active-Low)
2.5/8.0
P0, P1
Carry propagate inputs (active-Low)
2.5/8.0
P2
Carry propagate input (active-Low)
2.5/6.0
P3
Carry propagate input (active-Low)
2.5/4.0
Cn+x–Cn+z
Carry outputs
50/33
1.0mA/20mA
G
Carry generate output (active-Low)
50/33
1.0mA/20mA
P
Carry propagate output (active-Low)
50/33
1.0mA/20mA
NOTE:
One (1.0) FAST unit load is defined as: 20
μ
A in the High state and 0.6mA in the Low state.
相關(guān)PDF資料
PDF描述
74F182PC Carry Lookahead Generator
74F182SJ Carry Lookahead Generator
74F182 Carry Lookahead Generator
74F182PC Carry Lookahead Generator
74F182SJ Carry Lookahead Generator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
74F182 WAF 制造商:Fairchild Semiconductor Corporation 功能描述: 制造商:Rochester Electronics LLC 功能描述:
74F182DC 制造商:Freescale Semiconductor 功能描述:LOOK-AHEAD CARRY GENERATOR, 16 Pin, Ceramic, DIP
74F182LC 制造商:Rochester Electronics LLC 功能描述:- Bulk
74F182PC 功能描述:算數(shù)邏輯單元 - ALU Carry Lookahead Gen RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel
74F182SJ 功能描述:算數(shù)邏輯單元 - ALU Carry Lookahead Gen RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel
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