HITACHI HD74AC182

HD74AC182/HD74ACT182
Carry Lookhead Generator
Description
The HD74AC182/HD74ACT182 is a high-speed carry lookahead generator. It is generally used with the
HD74AC181 or HD74AC381 4-bit arithmetic logic unit to provide high-speed lookahead over word
lengths of more than four bits.
Features
• Outputs Source/Sink 24 mA
• HD74ACT182 has TTL-Compatible Inputs
Pin Arrangement
G1 1
16 VCC
P1 2
15 P2
G0 3
14 G2
P0 4
13 Cn
G3 5
12 Cn+X
P3 6
11 Cn+y
10 G
P 7
GND 8
9 Cn+z
(Top view)
HD74AC182/HD74ACT182
Logic Symbol
P0 G0
P1 G1
P2 G2
P3 G3
G
Cn
P
Cn+x
Cn+y
Pin Names
Cn
G0, G2
G1
G3
P 0, P 1
P2
P3
C n + x to Cn + z
G
P
2
Carry Input
Carry Generate Inputs (Active Low)
Carry Generate Input (Active Low)
Carry Generate Input (Active Low)
Carry Propagate Inputs (Active Low)
Carry Propagate Input (Active Low)
Carry Propagate Input (Active Low)
Carry Outputs
Carry Generate Output (Active Low)
Carry Propagate Output (Active Low)
Cn+z
HD74AC182/HD74ACT182
Logic Diagram
Cn G0 P0
Cn+x
G1 P1
G2 P2
Cn+y
G3 P3
Cn+z
G
P
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Functional Description
The HD74AC182/HD74ACT182 carry lookahead generator accepts up to four pairs of Active Low Carry
Propagate (P 0 to P 3) and Carry Generate (G 0 to G 3) signals and an Active High Carry input (Cn) and
provides anticipated Active High carries (Cn + x, C n + y , Cn + z ) across four groups of binary adders. The
HD74AC182/HD74ACT182 also has Active Low Carry Propagate ( P) and Carry Generate (G) outputs
which may be used for further level of lookahead. The logic equations provided at the outputs are:
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
= P3P 2P 1P 0
Also, the HD74AC182/HD74ACT182 can be used with binary ALUs in an active Low or active High input
operand mode. The connections (Figure a) to and from the ALU to the carry lookahead generator are
identical in both cases. Carries are rippled between 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 HD74AC182/HD74ACT182.
3
HD74AC182/HD74ACT182
Truth Table
Inputs
Outputs
Cn
G0
P0
X
H
H
L
L
H
X
L
X
L
X
H
H
X
L
H
X
X
X
H
H
L
X
H
H
H
X
L
L
H
X
H
X
L
X
X
X
L
X
H
X
L
X
X
L
H
H
X
L
X
L
H
X
X
X
X
X
H
H
L
X
X
X
H
H
H
X
L
X
H
H
H
X
H
X
L
L
H
X
H
X
H
X
L
X
X
X
X
X
L
X
H
X
X
X
L
X
X
L
H
X
L
X
X
L
X
L
H
H
X
L
X
L
X
L
H
X
X
X
X
X
H
H
H
X
X
X
H
H
H
X
H
X
H
H
H
X
H
X
H
H
H
X
H
X
H
X
H
X
X
X
X
X
L
X
L
X
X
X
L
X
X
L
L
X
L
X
X
L
X
L
L
L
X
L
X
L
X
L
L
H :
L :
X :
4
G1
P1
G2
P2
G3
P3
Cn + x
Cn + y
Cn + z
G
P
H
X
X
X
H
X
H
X
X
H
X
X
H
X
H
X
X
X
H
H
L
L
L
L
L
High Voltage Level
Low Voltage Level
Immaterial
HD74AC182/HD74ACT182
DC Characteristics (unless otherwise specified)
Item
Symbol
Max
Unit
Condition
Maximum quiescent supply current
I CC
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
I CC
8.0
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
Maximum ICC/input (HD74ACT182)
I CCT
1.5
mA
VIN = VCC – 2.1 V, VCC = 5.5 V,
Ta = Worst case
AC Characteristics: HD74AC182
Ta = +25°C
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
t PLH
3.3
1.0
8.0
10.5
1.0
11.5
ns
5.0
1.0
5.5
8.0
1.0
9.0
3.3
1.0
8.0
10.5
1.0
11.5
5.0
1.0
5.5
8.0
1.0
9.0
3.3
1.0
9.5
12.0
1.0
13.0
5.0
1.0
7.5
10.0
1.0
11.0
3.3
1.0
9.0
12.0
1.0
13.0
5.0
1.0
7.0
10.0
1.0
11.0
3.3
1.0
10.5
13.0
1.0
14.0
5.0
1.0
8.0
10.5
1.0
11.5
3.3
1.0
11.5
14.0
1.0
15.5
5.0
1.0
9.0
11.5
1.0
12.5
Pn to P
Propagation delay
t PHL
Pn to P
Propagation delay
t PLH
Cn to Cn + x, y, z
Propagation delay
t PHL
Cn to Cn + x, y, z
Propagation delay
t PLH
Pn or Gn to Cn + x, y, z
Propagation delay
Pn or Gn to Cn + x, y, z
Note:
t PHL
ns
ns
ns
ns
ns
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
5
HD74AC182/HD74ACT182
AC Characteristics: HD74ACT182
Ta = +25°C
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
Pn to P
t PLH
5.0
1.0
7.0
9.0
1.0
10.0
ns
Propagation delay
Pn to P
t PHL
5.0
1.0
8.0
10.0
1.0
11.0
ns
Propagation delay
Cn to Cn + x, y, z
t PLH
5.0
1.0
9.0
11.0
1.0
12.0
ns
Propagation delay
Cn to Cn + x, y, z
t PHL
5.0
1.0
9.0
11.0
1.0
12.0
ns
Propagation delay
Pn or Gn to Cn + x, y, z
t PLH
5.0
1.0
9.0
11.0
1.0
12.0
ns
Propagation delay
Pn or Gn to Cn + x, y, z
t PHL
5.0
1.0
10.0
12.5
1.0
13.5
ns
Note:
1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
Typ
Unit
Condition
Input capacitance
CIN
4.5
pF
VCC = 5.5 V
Power dissipation capacitance
CPD
50.0
pF
VCC = 5.0 V
6
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
Unit: mm
4.40
5.00
5.30 Max
16
9
1
8
0.65
0.13 M
1.10 Max
0.65 Max
0.10
*Dimension including the plating thickness
Base material dimension
6.40 ± 0.20
0.07 +0.03
–0.04
0.20 ± 0.06
1.0
*0.17 ± 0.05
0.15 ± 0.04
0.08
*0.22 +– 0.07
0° – 8°
0.50 ± 0.10
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
TTP-16DA
—
—
0.05 g
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contact Hitachi’s sales office before using the product in an application that demands especially high
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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
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