JD54F182BFA - NATIONAL SEMICONDUCTOR

54F182,74F182

54F182 74F182 Carry Lookahead Generator

Literature Number: SNOS165A

TL/F/9492

54F/74F182 Carry Lookahead Generator

December 1994

54F/74F182

Carry Lookahead Generator

General Description

The ’F182 is a high-speed carry lookahead generator. It is

generally used with the ’F181 or ’F381 4-bit arithmetic logic

units to provide high-speed lookahead over word lengths of

more than four bits.

Features

YProvides lookahead carries across a group of four

ALUs

YMulti-level lookahead high-speed arithmetic operation

over long word lengths

YGuaranteed 4000V minimum ESD protection

Commercial Military Package Package Description

Number

74F182PC N16E 16-Lead (0.300×Wide) Molded Dual-In-Line

54F182DM (Note 2) J16A 16-Lead Ceramic Dual-In-Line

74F182SJ (Note 1) M16D 16-Lead (0.300×Wide) Molded Small Outline, EIAJ

54F182FM (Note 2) W16A 16-Lead Cerpack

54F182LM (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C

Note 1: Devices also available in 13×reel. Use suffix eSCX and SJX.

Note 2: Military grade device with environmental and burn-in processing. Use suffix eDMQB, FMQB and LMQB

Logic Symbols Connection Diagrams

IEEE/IEC

TL/F/9492–6

TL/F/9492–3

Pin Assignment for

DIP, SOIC and Flatpak

TL/F/9492–1

Pin Assignment

for LCC

TL/F/9492–2

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Obsolete

Unit Loading/Fan Out

54F/74F

Pin Names Description U.L. Input IIH/IIL

HIGH/LOW Output IOH/IOL

CnCarry Input 1.0/2.0 20 mA/b1.2 mA

G0,G

2Carry Generate Inputs (Active LOW) 1.0/14.0 20 mA/b8.4 mA

G1Carry Generate Input (Active LOW) 1.0/16.0 20 mA/b9.6 mA

G3Carry Generate Input (Active LOW) 1.0/8.0 20 mA/b4.8 mA

P0,P

1Carry Propagate Inputs (Active LOW) 1.0/8.0 20 mA/b4.8 mA

P2Carry Propagate Input (Active LOW) 1.0/6.0 20 mA/b3.6 mA

P3Carry Propagate Input (Active LOW) 1.0/4.0 20 mA/b2.4 mA

CnaxbCnazCarry Outputs 50/33.3 b1 mA/20 mA

GCarry Generate Output (Active LOW) 50/33.3 b1 mA/20 mA

PCarry Propagate Output (Active LOW) 50/33.3 b1 mA/20 mA

Functional Description

The ’F182 carry lookahead generator accepts up to four

pairs of Active LOW Carry Propagate (P0–P3) and Carry

Generate (G0–G3) signals and an Active HIGH Carry input

(Cn) and provides anticipated Active HIGH carries (Cnax,

Cnay,C

) across four groups of binary adders. The

’F182 also has Active LOW Carry Propagate (P) and Carry

Generate (G) outputs which may be used for further levels

of lookahead. The logic equations provided at the outputs

are:

CnaxeG0aP0Cn

CnayeG1aP1G0aP1P0Cn

CnazeG2aP2G1aP2P1G0aP2P1P0Cn

GeG3aP3G2aP3P2G1aP3P2P1G0

PeP2P2P1P0

Also, the ’F182 can be used with binary ALUs in an active

LOW or active HIGH input operand mode. The connections

(Figure 1)

to and from the ALU to the carry lookahead gen-

erator are identical in both cases. Carries are rippled be-

tween 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 ’F181 or

’F381.

TL/F/9492–5

FIGURE 1. 32-Bit ALU with Rippled Carry between 16-Bit Lookahead ALUs

*ALUs may be either ’F181 or ’F381

Obsolete

Truth Table

Inputs Outputs

CnG0P0G1P1G2P2G3P3CnaxCnayCnazG P

XHH L

LHX L

XLX H

HXL H

XXXHH L

XHHHX L

LHXHX L

XXXLX H

XLXXL H

HXLXL H

XXXXXHH L

X XXHHHX L

XHHHXHX L

LHXHXHX L

XXXXXLX H

XXXLXXL H

XLXXLXL H

HXLXLXL H

X XXXXHH H

XXXHHHX H

X HHHXHX H

H HXHXHX H

X XXXXLX L

X XXLXXL L

XLXXLXL L

L XLXLXL L

HXXX H

XHXX H

XXHX H

XXXH H

LLLL L

HIGH Voltage Level

LeLOW Voltage Level

XeImmaterial

Logic Diagram

TL/F/9492–4

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

Obsolete

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Storage Temperature b65§Ctoa

150§C

Ambient Temperature under Bias b55§Ctoa

125§C

Junction Temperature under Bias b55§Ctoa

175§C

Plastic b55§Ctoa

150§C

VCC Pin Potential to

Ground Pin b0.5V to a7.0V

Input Voltage (Note 2) b0.5V to a7.0V

Input Current (Note 2) b30 mA to a5.0 mA

Voltage Applied to Output

in HIGH State (with VCC e0V)

Standard Output b0.5V to VCC

TRI-STATEÉOutput b0.5V to a5.5V

Current Applied to Output

in LOW State (Max) twice the rated IOL (mA)

ESD Last Passing Voltage (Min) 4000V

Note 1: Absolute maximum ratings are values beyond which the device may

be damaged or have its useful life impaired. Functional operation under

these conditions is not implied.

Note 2: Either voltage limit or current limit is sufficient to protect inputs.

Recommended Operating

Conditions

Free Air Ambient Temperature

Military b55§Ctoa

125§C

Commercial 0§Ctoa

70§C

Supply Voltage

Military a4.5V to a5.5V

Commercial a4.5V to a5.5V

DC Electrical Characteristics

Symbol Parameter 54F/74F Units VCC Conditions

Min Typ Max

VIH Input HIGH Voltage 2.0 V Recognized as a HIGH Signal

VIL Input LOW Voltage 0.8 V Recognized as a LOW Signal

VCD Input Clamp Diode Voltage b1.2 V Min IIN eb

18 mA

VOH Output HIGH 54F 10% VCC 2.5 IOH eb

1mA

Voltage 74F 10% VCC 2.5 V Min IOH eb

1mA

74F 5% VCC 2.7 IOH eb

1mA

OL Output LOW 54F 10% VCC 0.5 V Min IOL e20 mA

Voltage 74F 10% VCC 0.5 IOL e20 mA

IIH Input HIGH 54F 20.0

mA Max VIN e2.7V

Current 74F 5.0

IBVI Input HIGH Current 54F 100

mA Max VIN e7.0V

Breakdown Test 74F 7.0

ICEX Output HIGH 54F 250

mA Max VOUT eVCC

Leakage Current 74F 50

VID Input Leakage 74F 4.75 V 0.0 IID e1.9 mA

Test All Other Pins Grounded

IOD Output Leakage 74F 3.75 mA 0.0 VIOD e150 mV

Circuit Current All Other Pins Grounded

IIL Input LOW b1.2 VIN e0.5V (Cn)

Current b2.4 VIN e0.5V (P3)

b3.6 mA Max VIN e0.5V (P2)

b4.8 VIN e0.5V (G3,P

)

8.4 VIN e0.5V (G0,G

)

9.6 VIN e0.5V (G1)

IOS Output Short-Circuit Current b60 b150 mA Max VOUT e0V

ICCH Power Supply Current 18.4 28.0 mA Max VOeHIGH

ICCL Power Supply Current 23.5 36.0 mA Max VOeLOW

Obsolete

AC Electrical Characteristics

74F 54F 74F

TAea

25§CTA,V

CC eMil TA,V

CC eCom

Symbol Parameter VCC ea

5.0V CLe50 pF CLe50 pF Units

CLe50 pF

Min Typ Max Min Max Min Max

tPLH Propagation Delay 3.0 6.6 8.5 3.0 12.0 3.0 9.5 ns

tPHL Cnto Cnax,C

z3.0 6.8 9.0 3.0 11.0 3.0 10.0

tPLH Propagation Delay 2.5 6.2 8.0 2.5 11.0 2.5 9.0

tPHL P0,P

,orP

2to 1.5 3.7 5.0 1.0 7.0 1.5 6.0 ns

Cnax,C

,orC

PLH Propagation Delay 2.5 6.5 8.5 2.5 11.0 2.5 9.5

tPHL G0,G

,orG

2to 1.5 3.9 5.2 1.0 7.0 1.5 6.0 ns

Cnax,C

,orC

PLH Propagation Delay 3.0 7.9 10.0 3.0 12.0 3.0 11.0 ns

tPHL P1,P

,orP

3to G 3.0 6.0 8.0 2.5 10.0 3.0 9.0

tPLH Propagation Delay 3.0 8.3 10.5 3.0 12.0 3.0 11.5 ns

tPHL Gnto G 3.0 5.7 7.5 2.5 10.0 3.0 8.5

tPLH Propagation Delay 3.0 5.7 7.5 2.5 10.0 3.0 8.5 ns

tPHL Pnto P 2.5 4.1 5.5 2.5 8.0 2.5 6.5

Ordering Information

The device number is used to form part of a simplified purchasing code where the package type and temperature range are

defined as follows:

74F 182 P C QB

Temperature Range Family Special Variations

74F eCommercial QB eMilitary grade with

54F eMilitary environmental and burn-in

processing shipped in tubes

Device Type

Temperature Range

Package Code CeCommercial (0§Ctoa

70§C)

PePlastic DIP MeMilitary (b55§Ctoa

125§C)

DeCeramic DIP

FeFlatpak

LeLeadless Chip Carrier (LCC)

SJ eSmall Outline SOIC EIAJ

Obsolete

Physical Dimensions inches (millimeters)

20-Lead Ceramic Leadless Chip Carrier (L)

NS Package Number E20A

16-Lead Ceramic Dual-In-Line Package (D)

NS Package Number J16A

Obsolete

Physical Dimensions inches (millimeters) (Continued)

16-Lead (0.300×Wide) Molded Small Outline Package, EIAJ (SJ)

NS Package Number M16D

16-Lead (0.300×Wide) Molded Dual-In-Line Package (P)

NS Package Number N16E

Obsolete

54F/74F182 Carry Lookahead Generator

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Flatpak (F)

NS Package Number W16A

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Obsolete

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