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
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