SGS Thomson Microelectronics M74HC182 Datasheet
FUNCTION LOOK AHEAD CARRY GENERATOR
.HIGH SPEED
tPD= 14 ns(TYP.) at VCC=5V
.LOWPOWER DISSIPATION
ICC=4µA(MAX.) at TA=25°C
.HIGH NOISE IMMUNITY
V
NIH=VNIL
=28%VCC(MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL= 4 mA(MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.WIDE OPERATING VOLTAGE RANGE
VCC(OPR)= 2 V to 6 V
.PIN ANDFUNCTION COMPATIBLE
WITH 54/74LS182
DESCRIPTION
The M54/74HC182 is a high speed CMOS FUNCTION LOOK AHEAD CARRY GENERATOR
fabricated insilicongate C2MOStechnology. It has
the same high speed performance of LSTTL combined with true CMOS low power consumption.
These circuit are capable of anticipating a carry
acrossfour binary addersor group of adders. They
arecascadable to perform full look-ahead across nbit adders. Carry, generate-carry, and
propagate-carry functions are providedas shown in
the pinconnection table. When used in conjunction
with the HC181 arithmetic logic unit, these generators provide high-speed carry look-ahead
capability for any word length. Each HC182 generates the look-ahead (anticipated carry) across a
groupoffourALU’sand,inaddition, othercarrylookaheadcircuits may be employed toanticipate carry
across sections of four look-ahead packages up to
n-bits. Themethod of cascading circuits to perform
multi-levellook-ahead isillustrated under typical application data.
Carry input and outputof the ALUs are in their true
form, andthe carrypropagate (P) and carrygenerate (G) are in negated form ; therefore, the carry
functions(inputs, outputs,generate, andpropagate)
of the look-ahead generators are implemented in
the compatible forms for direct connection to the
ALU. Reinterpretation of carry functions as explained ontheHC181datasheetarealsoapplicable
toandcompatible withthelook-aheadgenerator. All
inputs areequipped with protection circuits against
staticdischarge and transient excess voltage.
M54HC182
M74HC182
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 182F1R M74H C182M1R
M74HC 182B1R M74HC1 82C1R
PIN CONNECTIONS(top view)
NC =
No Internal
Connection
F1R
(CeramicPackage)
C1R
(Chip Carrier)
March1993
1/12
M54/M74HC182
FUNCTION TABLES
FOR G OUTPUT
INPUTS OUTPUT
G3 G2 G1 G0 P3 P2 P1 G
LXXXXXXL
XLXXLXXL
XXLXLLXL
XXXLLLLL
ALL OTHER COMBINATIONS H
FOR P OUTPUT
INPUTS OUTPUT
P3 P2 P1 P0 P
LLLLL
ALL OTHER COMBINATIONS H
FOR Cn+x OU TPUT
INPUTS OUTPUT
G0 P0 Cn Cn+x
LXXH
XLHH
ALL OTHER COMBINATIONS L
FOR Cn+y OU TPUT
INPUTS OUTPUT
G1 G0 P1 P0 Cn Cn+y
LXXXXH
XLLXXH
XXLLHH
ALL OTHER COMBINATIONS L
FOR Cn+z OU TPUT
INPUTS OUTPUT
G2 G1 G0 P2 P1 P0 Cn Cn+z
LXXXXXXH
XLXLXXXH
XXLLLXXH
XXXLLLHH
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
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LOGIC DIAGRAM
M54/M74HC182
3/12
M54/M74HC182
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
3, 1, 14, 5 G0 to G3 Carry Generate Inputs
4, 2, 15, 6 P0 to P3 Carry Propagate Inputs
7 P Carry Propagate Output
9 Cn+z Function Output
10 G Carry Generate Output
11 Cn+y Function Output
12 Cn+x Function Output
13 Cn
8 GND Ground (0V)
16 V
IEC LOGIC SYMBOLS
CC
(Active LOW)
(Active LOW)
(Active LOW)
(Active LOW)
Positive Supply Voltage
ABSOLU TE MAXI MU M RAT INGS
Symbol Parameter Value Unit
V
CC
V
V
O
I
IK
I
OK
I
O
or I
I
CC
P
D
T
stg
T
AbsoluteMaximumRatings arethose valuesbeyond whichdamage tothedevice mayoccur. Functionaloperation under these conditionisnotimplied.
(*)500 mW:≅ 65oC derate to 300mW by 10mW/oC: 65oCto85oC
4/12
Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V
I
DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA
GND
Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10 sec) 300
L
o
C
o
C
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