Document Outline
- FEATURES
- DESCRIPTION
- PIN CONFIGURATION
- ORDERING INFORMATION
- INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
- LOGIC SYMBOL
- IEC/IEEE SYMBOL
- LOGIC DIAGRAM
- FUNCTION TABLE
- APPLICATION
- ABSOLUTE MAXIMUM RATINGS
- RECOMMENDED OPERATING CONDITIONS
- DC ELECTRICAL CHARACTERISTICS
- AC ELECTRICAL CHARACTERISTICS
- AC WAVEFORMS
- TEST CIRCUIT AND WAVEFORMS
Philips Semiconductors
Product specification
74F182
Look-ahead carry generator
2
1991 Apr 15
8531161 02162
FEATURES
Provides carry look-ahead across a group of four ALUs
Multi-level look-ahead for high speed arithmetic operation over
long word lengths
DESCRIPTION
The 74F182 is a high speed carry look-ahead generator. It 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 Carry
input (Cn) and provides anticipated active-High carries (Cn+x, Cn+y,
Cn+z) across four groups of binary adders. The 74F182 also has
active-Low Carry Propagate (P) Carry Generate (G) outputs which
may be used for further levels of look-ahead.
The logic equations provided at the outputs are:
Cn+x = G0+P0Cn
Cn+y = G1+P1G0+P1P0Cn
Cn+z = G2+P2G1+P2P1G0+P2P1P0Cn
G = G3+P3G2+P3P2G1+P3P2P1G0
P = P3P2P1P0
The 74F182 can also 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 look-ahead generator are identical in both cases.
PIN CONFIGURATION
16
15
14
13
12
11
10
7
6
5
4
3
2
1
P
V
CC
Cn+x
Cn+y
G
Cn
P2
G2
G1
P1
P3
G0
P0
G3
9
8
GND
Cn+z
SF00725
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F182
5.0ns
21mA
ORDERING INFORMATION
DESCRIPTION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
10%, T
amb
= 0
C to +70
C
16-pin plastic DIP
N74F182N
16-pin plastic SO
N74F182D
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74FAST (U.L.) HIGH/LOW
LOAD VALUE HIGH/LOW
Cn
Carry input
2.5/2.0
50
A/1.2mA
G0, G2
Carry generate inputs (active-Low)
2.5/14.0
50
A/8.4mA
G1
Carry generate input (active-Low)
2.5/16.0
50
A/9.6mA
G3
Carry generate input (active-Low)
2.5/8.0
50
A/4.8mA
P0, P1
Carry propagate inputs (active-Low)
2.5/8.0
50
A/4.8mA
P2
Carry propagate input (active-Low)
2.5/6.0
50
A/3.6mA
P3
Carry propagate input (active-Low)
2.5/4.0
50
A/2.4mA
Cn+xCn+z
Carry outputs
50/33
1.0mA/20mA
G
Carry generate output (active-Low)
50/33
1.0mA/20mA
P
Carry propagate output (active-Low)
50/33
1.0mA/20mA
NOTE:
One (1.0) FAST unit load is defined as: 20
A in the High state and 0.6mA in the Low state.
Philips Semiconductors
Product specification
74F182
Look-ahead carry generator
1991 Apr 15
3
LOGIC SYMBOL
Cn+y
Cn+z
Cn+x
P1
G1
P2 G2
2
1
15
14
12
11
9
V
CC
= Pin 16
GND = Pin 8
SF00726
G0
3
P0
4
P3
6
G3
5
10
7
13
G
P
Cn
IEC/IEEE SYMBOL
SF00727
CPG
13
4
14
6
5
12
11
9
7
10
C00
C01
C02
CP
CG
3
2
1
15
CI
CP0
CG0
CP1
CG1
CP2
CG2
CP3
CG3
LOGIC DIAGRAM
3
Cn
SF00724
4
13
1
2
14
15
5
6
G0
P0
G1
P1
G2
P2
G3
P3
12
11
9
10
7
G
P
Cn+z
Cn+y
Cn+x
V
CC
= Pin 16
GND = Pin 8
Philips Semiconductors
Product specification
74F182
Look-ahead carry generator
1991 Apr 15
4
FUNCTION TABLE
INPUTS
OUTPUTS
Cn
G0
P0
G1
P1
G2
P2
G3
P3
Cn+x
Cn+y
Cn+z
G
P
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
X
X
X
H
X
H
X
X
H
X
X
H
X
H
X
X
X
H
H
L
L
L
L
L
NOTES:
H = High voltage level
L
= Low voltage level
X = Don't care
Philips Semiconductors
Product specification
74F182
Look-ahead carry generator
1991 Apr 15
5
APPLICATION
SF00728
Cn+y
Cn+z
Cn+x
P1 G1 P2 G2
G0
P0
P3 G3
G
P
Cn
Cn+y
Cn+z
Cn+x
P1 G1 P2 G2
G0
P0
P3 G3
G
P
Cn
C
IN
Cn
Cn+4
G
P
ALU*
Cn
Cn+4
ALU*
Cn
Cn+4
ALU*
Cn
G
P
ALU*
Cn
Cn+4
G
P
ALU*
Cn
G
P
ALU*
Cn
G
P
ALU*
Cn
G
P
ALU*
74F182
74F182
COUT
(C32)
F
A, B
C18
Figure 1. 32-Bit ALU with Ripple Carry Between 16-Bit Look-Ahead ALUs (*ALUs may be either 74F181 or 74F381)
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
V
CC
Supply voltage
0.5 to +7.0
V
V
IN
Input voltage
0.5 to +7.0
V
I
IN
Input current
30 to +5
mA
V
OUT
Voltage applied to output in High output state
0.5 to V
CC
V
I
OUT
Current applied to output in Low output state
40
mA
T
amb
Operating free-air temperature range
0 to +70
C
T
stg
Storage temperature range
65 to +150
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN
NOM
MAX
UNIT
V
CC
Supply voltage
4.5
5.0
5.5
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level input voltage
0.8
V
I
IK
Input clamp current
18
mA
I
OH
High-level output current
1
mA
I
OL
Low-level output current
20
mA
T
amb
Operating free-air temperature range
0
70
C
Philips Semiconductors
Product specification
74F182
Look-ahead carry generator
1991 Apr 15
6
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN
TYP
2
MAX
UNIT
V
OH
High-level output voltage
V
CC
= MIN, V
IL
= MAX,
V
IH
= MIN
I
OH
= MAX
10%V
CC
2.5
V
V
OH
High-level output voltage
V
CC
= MIN, V
IL
= MAX,
V
IH
= MIN
I
OH
= MAX
5%V
CC
2.7
3.4
V
V
OL
Low-level output voltage
V
CC
= MIN, V
IL
= MAX,
V
IH
= MIN
I
OL
= MAX
10%V
CC
0.30
0.50
V
V
OL
Low-level output voltage
V
CC
= MIN, V
IL
= MAX,
V
IH
= MIN
I
OL
= MAX
5%V
CC
0.30
0.50
V
V
IK
Input clamp voltage
V
CC
= MIN, I
I
= I
IK
0.73
1.2
V
I
I
Input current at maximum input voltage
V
CC
= MAX, V
I
= 7.0V
250
A
I
IH
High-level input current
V
CC
= MAX, V
I
= 2.7V
250
A
I
IL
Low-level input current
Cn
V
CC
= MAX, V
I
= 0.5V
1.2
mA
I
IL
Low-level input current
G0, G2
V
CC
= MAX, V
I
= 0.5V
8.4
mA
I
IL
Low-level input current
G1
V
CC
= MAX, V
I
= 0.5V
9.6
mA
I
IL
Low-level input current
G3, P0, P1
V
CC
= MAX, V
I
= 0.5V
4.8
mA
P2
3.6
mA
P3
2.4
mA
I
OS
Short-circuit output current
3
V
CC
= MAX
60
150
mA
I
CC
Supply current (total)
I
CCH
V
CC
= MAX
18
28
mA
I
CC
Supply current (total)
I
CCL
V
CC
= MAX
24
36
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25
C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
OS
tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
TEST
CONDITION
LIMITS
UNIT
SYMBOL
PARAMETER
TEST
CONDITION
V
CC
= +5.0V
T
amb
= +25
C
C
L
= 50pF
R
L
= 500
V
CC
= +5.0V
10%
T
amb
= 0
C to +70
C
C
L
= 50pF
R
L
= 500
UNIT
MIN
TYP
MAX
MIN
MAX
t
PLH
t
PHL
Propagation delay
Cn to Cn+x, Cn+y, Cn+z
Waveform 2
2.5
2.5
5.0
5.0
8.0
7.5
2.5
2.5
8.5
8.5
ns
t
PLH
t
PHL
Propagation delay
P0, P1, or P2 to Cn+x, Cn+y, Cn+z
Waveform 1
2.0
1.5
5.0
3.5
7.0
5.0
1.5
1.5
8.0
6.0
ns
t
PLH
t
PHL
Propagation delay
G0, G1, or G2 to Cn+x, Cn+y, Cn+z
Waveform 1
1.5
1.5
4.0
3.0
7.5
5.0
1.5
1.5
8.5
5.5
ns
t
PLH
t
PHL
Propagation delay
P1, P2, or P3 to G
Waveform 2
2.0
3.0
7.0
5.0
10.0
7.0
1.5
2.5
11.0
8.0
ns
t
PLH
t
PHL
Propagation delay
Gn to G
Waveform 2
1.5
3.0
5.0
5.0
7.0
7.0
1.5
2.5
7.5
8.0
ns
t
PLH
t
PHL
Propagation delay
Pn to P
Waveform 2
1.5
2.5
3.5
4.0
6.0
6.0
1.5
2.5
7.5
6.5
ns
Philips Semiconductors
Product specification
74F182
Look-ahead carry generator
1991 Apr 15
7
AC WAVEFORMS
For all waveforms, V
M
= 1.5V
V
M
V
M
V
M
V
M
V
OUT
V
IN
t
PHL
t
PLH
SF00093
Waveform 1.
Propagation Delay for Inverting Outputs
VM
VM
VM
VM
VOUT
VIN
tPLH
tPHL
SF00092
Waveform 2. Propagation Delay for Non-Inverting Outputs
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
0V
tTHL (tf
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLH
t
THL
1MHz
500ns
2.5ns
2.5ns
Input Pulse Definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for Totem-Pole Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC ELECTRICAL CHARACTERISTICS for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC ELECTRICAL CHARACTERISTICS for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
tTHL (tf
)
tTLH (tr
)
tTLH (tr
)
AMP (V)
amplitude
3.0V
1.5V
V
M
SF00006
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