M54HC182
M74HC182
March 1993
FUNCTION LOOK AHEAD CARRY GENERATOR
B1R
(Plastic Package)
ORDER CODES :
M54HC182F1R
M74HC182M1R
M74HC182B1R
M74HC182C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
DESCRIPTION
.
HIGH SPEED
t
PD
= 14 ns (TYP.) at V
CC
= 5 V
.
LOW POWER DISSIPATION
I
CC
= 4
A (MAX.) at T
A
= 25
C
.
HIGH NOISE IMMUNITY
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
IOH
= I
OL
= 4 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
.
WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V to 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS182
The M54/74HC182 is a high speed CMOS FUNC-
TION LOOK AHEAD CARRY
GENERATOR
fabricated in silicon gate C
2
MOS technology. It has
the same high speed performance of LSTTL com-
bined with true CMOS low power consumption.
These circuit are capable of anticipating a carry
across four binary adders or group of adders. They
are cascadable to perform full look-ahead across n-
bit
adders.
Carry,
generate-carry,
and
propagate-carry functions are provided as shown in
the pin connection table. When used in conjunction
with the HC181 arithmetic logic unit, these gener-
ators
provide
high-speed
carry
look-ahead
capability for any word length. Each HC182 gener-
ates the look-ahead (anticipated carry) across a
group of four ALU's and, in addition, other carry look-
ahead circuits may be employed to anticipate carry
across sections of four look-ahead packages up to
n-bits. The method of cascading circuits to perform
multi-level look-ahead is illustrated under typical ap-
plication data.
Carry input and output of the ALUs are in their true
form, and the carry propagate (P) and carry gener-
ate (G) are in negated form ; therefore, the carry
functions (inputs, outputs, generate, and propagate)
of the look-ahead generators are implemented in
the compatible forms for direct connection to the
ALU. Reinterpretation of carry functions as ex-
plained on the HC181 data sheet are also applicable
to and compatible with the look-ahead generator. All
inputs are equipped with protection circuits against
static discharge and transient excess voltage.
1/12
FUNCTION TABLES
FOR G OUTPUT
INPUTS
OUTPUT
G3
G2
G1
G0
P3
P2
P1
G
L
X
X
X
X
X
X
L
X
L
X
X
L
X
X
L
X
X
L
X
L
L
X
L
X
X
X
L
L
L
L
L
ALL OTHER COMBINATIONS
H
FOR P OUTPUT
INPUTS
OUTPUT
P3
P2
P1
P0
P
L
L
L
L
L
ALL OTHER COMBINATIONS
H
FOR Cn+x OUTPUT
INPUTS
OUTPUT
G0
P0
Cn
Cn+x
L
X
X
H
X
L
H
H
ALL OTHER COMBINATIONS
L
FOR Cn+y OUTPUT
INPUTS
OUTPUT
G1
G0
P1
P0
Cn
Cn+y
L
X
X
X
X
H
X
L
L
X
X
H
X
X
L
L
H
H
ALL OTHER COMBINATIONS
L
FOR Cn+z OUTPUT
INPUTS
OUTPUT
G2
G1
G0
P2
P1
P0
Cn
Cn+z
L
X
X
X
X
X
X
H
X
L
X
L
X
X
X
H
X
X
L
L
L
X
X
H
X
X
X
L
L
L
H
H
ALL OTHER COMBINATIONS
L
Cn+x = G0 + P0Cn
Cn+y = G1 + P1G0 + P1P0Cn
Cn+z = G2 + P2G1 + P2P1G0 + P2P1P0Cn
G
= G3 + G3 + P3G2 + P3P2G1 + P3P2P1G0
P
= P3P2P1P0
or
Cn+x = Y0 + (X0 + Cn)
Cn+y = Y1 + [X1 + Y0(X0 + Cn)]
Cn+z = Y2 + {X2 + Y1[X1 + Y0(X0 +Cn)]}
G
= Y3 + (X3 + Y2)(X3 + X2 + Y1)(X3 + X2 + X1 + Y0)
P
= X3 + X2 + X1 + X0
M54/M74HC182
2/12
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
3, 1, 14, 5
G0 to G3
Carry Generate Inputs
(Active LOW)
4, 2, 15, 6
P0 to P3
Carry Propagate Inputs
(Active LOW)
7
P
Carry Propagate Output
(Active LOW)
9
Cn+z
Function Output
10
G
Carry Generate Output
(Active LOW)
11
Cn+y
Function Output
12
Cn+x
Function Output
13
Cn
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
IEC LOGIC SYMBOLS
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Source Sink Current Per Output Pin
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
P
D
Power Dissipation
500 (*)
mW
T
stg
Storage Temperature
-65 to +150
o
C
T
L
Lead Temperature (10 sec)
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
(*) 500 mW:
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
M54/M74HC182
4/12
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
Value
Unit
V
CC
(V)
T
A
= 25
o
C
54HC and 74HC
-40 to 85
o
C
74HC
-55 to 125
o
C
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
2.0
1.5
1.5
1.5
V
4.5
3.15
3.15
3.15
6.0
4.2
4.2
4.2
V
IL
Low Level Input
Voltage
2.0
0.5
0.5
0.5
V
4.5
1.35
1.35
1.35
6.0
1.8
1.8
1.8
V
OH
High Level
Output Voltage
2.0
V
I
=
V
IH
or
V
IL
I
O
=-20
A
1.9
2.0
1.9
1.9
V
4.5
4.4
4.5
4.4
4.4
6.0
5.9
6.0
5.9
5.9
4.5
I
O
=-6.0 mA
4.18
4.31
4.13
4.10
6.0
I
O
=-7.8 mA
5.68
5.8
5.63
5.60
V
OL
Low Level Output
Voltage
2.0
V
I
=
V
IH
or
V
IL
I
O
= 20
A
0.0
0.1
0.1
0.1
V
4.5
0.0
0.1
0.1
0.1
6.0
0.0
0.1
0.1
0.1
4.5
I
O
= 6.0 mA
0.17
0.26
0.37
0.40
6.0
I
O
= 7.8 mA
0.18
0.26
0.37
0.40
I
I
Input Leakage
Current
6.0
V
I
= V
CC
or GND
0.1
1
1
A
I
OZ
3 State Output
Off State Current
6.0
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
0.5
5.0
10
A
I
CC
Quiescent Supply
Current
6.0
V
I
= V
CC
or GND
4
40
80
A
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2 to 6
V
V
I
Input Voltage
0 to V
CC
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
o
C
o
C
t
r
, t
f
Input Rise and Fall Time
V
CC
= 2 V
0 to 1000
ns
V
CC
= 4.5 V
0 to 500
V
CC
= 6 V
0 to 400
M54/M74HC182
5/12
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