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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 (C
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:
n+x
, C
n+y, Cn+z
) across four groups of binary adders. The
C
= Y0 (X0 + Cn)
n+x
C
= Y1 {X1 + Y0 (X0 + Cn)}
n+y
C
= Y2 [X2 + Y1 {X1 + Y0 (X0 + Cn)}]
n+z
Y = Y3 (X3 + Y2) (X3 + X2 + Y1) (X3 + X2 + X1 + Y0)
X = X3 + X2 + X1 + X
0
or
C
= G0 + P0C
n+x
C
= G1 + P1G0 + P1P0C
n+y
C
= G2 + P2G1 + P2P1G0 + P2P1P0C
n+z
G = G3 + P3G2 + P3P2G1 + P3P2P1G
P = P3P2P1P
n
n
n
0
0
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.
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HD74HC182
Features
• High Speed Operation: tpd (Pn to P) = 11 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Pin Designations
Item Pin No. Functions
, G1, G2, G
G
0
P0, P1, P2, P
C
n
C
, C
n+x
n+y
, C
3
3
n+z
G 10 Active-low carry propagate output
P 7 Active-low carry propagate output
V
CC
GND 8 Ground
3, 1, 14, 5 Active-low carry generate inputs
4, 2, 15, 6 Active-low carry propagate inputs
13 Carry input
12, 11, 9 Carry outputs
16 Supply voltage
2
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Pin Arrangement
HD74HC182
Logic Diagram
Inputs
Output
G1
P1
C0
P0
G3
P3
GND
1
2
3
4
5
6
7
P
P1
G
P0
G3
P3
P
0
G1
Cn+z
P2
G
Cn
Cn+x
Cn+y
2
G
8
16
15
14
13
12
11
10
V
CC
P2
G2
Inputs
Cn
Cn+x
Cn+y
Outputs
G
9
C
n+z
(Top view)
P
P
G3
P2
G2
P1
G1
P0
G0
Cn
G
3
n+z
C
Cn+y
Cn+x
3
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HD74HC182
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
IL
2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –4 mA
6.0 5.68 — — 5.63 — IOH = –5.2 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 4 mA
6.0 — — 0.26 — 0.33 IOL = 5.2 mA
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
I
CC
6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
current
+85°C
4
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AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol V
Propagation delay t
time t
PLH
PHL
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 140 — 175 ns Pn to P
4.5 — 11 28 — 35
6.0 — — 24 — 30
2.0 — — 150 — 190 ns Cn to output
4.5 — 15 30 — 38
6.0 — — 26 — 33
2.0 — — 185 — 230 ns Pn or Gn to output
4.5 — 17 37 — 46
6.0 — — 31 — 39
Output rise/fall t
time t
TLH
THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
+85°C
HD74HC182
5
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19.20
20.00 Max
16 9
1.3
Unit: mm
6.30
7.40 Max
81
1.11 Max
2.54 ± 0.25
0.48 ± 0.10
5.06 Max
2.54 Min
0.51 Min
Hitachi Code
JEDEC
EIAJ
Weight
7.62
+ 0.13
0.25
– 0.05
0° – 15°
(reference value)
DP-16
Conforms
Conforms
1.07 g
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16
Unit: mm
10.06
10.5 Max
9
5.5
1
0.80 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.12
0.10 ± 0.10
0.15
M
2.20 Max
7.80
0.20 ± 0.04
*0.22 ± 0.05
0.70 ± 0.20
Hitachi Code
JEDEC
EIAJ
(reference value)
Weight
+ 0.20
– 0.30
1.15
0° – 8°
FP-16DA
—
Conforms
0.24 g
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16
Unit: mm
9.9
10.3 Max
9
1
1.27
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.25
+ 0.11
– 0.04
0.14
0.15
3.95
1.75 Max
M
6.10
1.08
0.20 ± 0.03
*0.22 ± 0.03
0.60
Hitachi Code
JEDEC
EIAJ
Weight
+ 0.10
– 0.30
0° – 8°
+ 0.67
– 0.20
(reference value)
FP-16DN
Conforms
Conforms
0.15 g
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received the latest product standards or specifications before final design, purchase or use.
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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
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for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
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failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
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products.
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