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PDF HD74HC182 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC182 | |
| Descripción | Look-Ahead Carry Generator | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74HC182
Look-Ahead Carry Generator
Description
The HD74HC182 is a high-speed Carry Lockahead Generator. It is used with the HD74HC181 4-Bit
Arithmetic Logic Unit to provide high-speed lockahead over World lengths of more than four bits. The
device 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 carries (Cn+x, Cn+y, Cn+z) across four groups of binary adders. The
HD74HC182 also has active-low Carry Propagate (P) and Carry Generate (G) outputs which may be used
for further levels of lockahead.
The logic equations provided at the outputs are:
Cn+x = Y0 (X0 + Cn)
Cn+y = Y1 {X1 + Y0 (X0 + Cn)}
Cn+z = Y2 [X2 + Y1 {X1 + Y0 (X0 + Cn)}]
Y = Y3 (X3 + Y2) (X3 + X2 + Y1) (X3 + X2 + X1 + Y0)
X = X3 + X2 + X1 + X0
or
Cn+x = G0 + P0Cn
Cn+y = G1 + P1G0 + P1P0Cn
Cn+z = G2 + P2G1 + P2P1G0 + P2P1P0Cn
G = G3 + P3G2 + P3P2G1 + P3P2P1G0
P = P3P2P1P0
Also, the HD74HC182 can 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 lookahead generator are identical in both cases.
1 page  
HD74HC182
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Symbol
Propagation delay tPLH
time
t PHL
VCC (V)
2.0
4.5
6.0
Min Typ Max Min
— — 140 —
— 11 28 —
— — 24 —
Max Unit
175 ns
35
30
2.0 — — 150 — 190 ns
4.5 — 15 30 — 38
6.0 — — 26 — 33
2.0 — — 185 — 230 ns
4.5 — 17 37 — 46
6.0 — — 31 — 39
Output rise/fall
time
t TLH
t THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
Test Conditions
Pn to P
Cn to output
Pn or Gn to output
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74HC182.PDF ] | |
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