HITACHI HD74HC182

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 (P 0, P1, P 2, P 3) and Carry Generate (G0, G1,
G 2, G3) signals and an active-high carries (C n+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:
C n+x = Y0 (X0 + Cn)
C n+y = Y1 {X 1 + Y0 (X0 + Cn)}
C n+z = Y2 [X2 + Y1 {X 1 + Y0 (X0 + Cn)}]
Y = Y3 (X3 + Y2) (X3 + X2 + Y1) (X3 + X2 + X1 + Y0)
X = X3 + X2 + X1 + X0
or
C n+x = G0 + P0Cn
C n+y = G1 + P1G0 + P1P0C n
C n+z = G2 + P2G1 + P2P1G0 + P2P1P 0C n
G = G3 + P3G2 + P3P2G1 + P3P2P 1G0
P = P3P2P 1P 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.
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
G0, G1, G2, G3
3, 1, 14, 5
Active-low carry generate inputs
P0, P1, P2, P3
4, 2, 15, 6
Active-low carry propagate inputs
Cn
13
Carry input
Cn+x, Cn+y, Cn+z
12, 11, 9
Carry outputs
G
10
Active-low carry propagate output
P
7
Active-low carry propagate output
VCC
16
Supply voltage
GND
8
Ground
2
HD74HC182
Pin Arrangement
G1 1
Inputs
Output
16 VCC
G1
P2
15 P2
G0
G2
14 G2
P0 4
P0
Cn
13 Cn
G3 5
G3
Cn+x
12 Cn+x
P3 6
P3
Cn+y
11 Cn+y
P 7
P
P1 2
P1
C0 3
Cn+z
G
GND 8
10 G
Inputs
Outputs
9 Cn+z
(Top view)
Logic Diagram
P
G
P3
G3
Cn+z
P2
G2
Cn+y
P1
G1
P0
G0
Cn+x
Cn
3
HD74HC182
DC Characteristics
Ta = –40 to
+85°C
Ta = 25°C
Item
Symbol
VCC (V) Min Typ Max Min
Max
Unit
Input voltage
VIH
2.0
1.5 —
—
1.5
—
V
4.5
3.15 —
—
3.15
—
6.0
4.2 —
—
4.2
—
2.0
—
—
0.5
—
0.5
4.5
—
—
1.35 —
1.35
6.0
—
—
1.8
—
1.8
2.0
1.9 2.0 —
1.9
—
4.5
4.4 4.5 —
4.4
—
6.0
5.9 6.0 —
5.9
—
4.5
4.18 —
—
4.13
—
I OH = –4 mA
6.0
5.68 —
—
5.63
—
I OH = –5.2 mA
2.0
—
0.0 0.1
—
0.1
4.5
—
0.0 0.1
—
0.1
6.0
—
0.0 0.1
—
0.1
4.5
—
—
0.26 —
0.33
I OL = 4 mA
6.0
—
—
0.26 —
0.33
I OL = 5.2 mA
VIL
Output voltage
VOH
VOL
Test Conditions
V
V
V
Vin = VIH or VIL I OH = –20 µA
Vin = VIH or VIL I OL = 20 µA
Input current
Iin
6.0
—
—
±0.1 —
±1.0
µA
Vin = VCC or GND
Quiescent supply
current
I CC
6.0
—
—
4.0
40
µA
Vin = VCC or GND, Iout = 0 µA
4
—
HD74HC182
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
+85°C
Ta = 25°C
VCC (V) Min Typ Max Min
Max
Unit
Test Conditions
Propagation delay t PLH
2.0
—
—
140 —
175
ns
Pn to P
time
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
Item
Symbol
t PHL
Output rise/fall
t TLH
2.0
—
—
75
—
95
time
t THL
4.5
—
5
15
—
19
6.0
—
—
13
—
16
—
—
5
10
—
10
Input capacitance
Cin
ns
pF
5
Unit: mm
19.20
20.00 Max
1
7.40 Max
9
6.30
16
8
1.3
0.48 ± 0.10
2.54 Min 5.06 Max
2.54 ± 0.25
0.51 Min
1.11 Max
7.62
+ 0.13
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
16
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DA
—
Conforms
0.24 g
Unit: mm
9.9
10.3 Max
9
1
8
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
0.15
*0.22 ± 0.03
0.20 ± 0.03
1.27
0.11
0.14 +– 0.04
1.75 Max
3.95
16
0.10
6.10 +– 0.30
1.08
0° – 8°
0.67
0.60 +– 0.20
0.25 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DN
Conforms
Conforms
0.15 g
Cautions
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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.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
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
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
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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