Datasheet 74 hct182 DATASHEETS (Philips)

INTEGRATED CIRCUITS

DATA SH EET

For a complete data sheet, please also download:

•The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Information

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines

74HC/HCT182

Look-ahead carry generator

Product speciﬁcation File under Integrated Circuits, IC06

December 1990

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

FEATURES

• Provides carry look-ahead across a group of four ALU’s

• Multi-level look-ahead for high-speed arithmetic

operation over long word length

• Output capability: standard

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT182 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC

anticipated active HIGH carries (C four groups of binary adders.

The “182” also has active LOW carry propagate (P) and carry generate (G) outputs which may be used for further levels of look-ahead.

The logic equations provided at the outputs are: C

n+x=G0+P0Cn

C

n+y=G1+P1G0+P1P0Cn

C

n+z=G2+P2G1+P2P1G0+P2P1P0Cn

GG PP

=

standard no. 7A. The 74HC/HCT182 carry look-ahead generators accept

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). The devices provide

The “182” can also be used with binary ALU’s 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.

QUICK REFERENCE DATA

GND = 0 V; T

=25°C; tr=tf= 6 ns

amb

SYMBOL PARAMETER CONDITIONS

t

PHL

/ t

PLH

propagation delay

CL= 15 pF; VCC=5 V Pn to P Cn to any output Pn or Gn to any output

C

I

C

PD

input capacitance 3.5 3.5 pF power dissipation capacitance per

notes 1 and 2

package

P3G2P3P2G1P3P2P1G

++ +=

3

P2P1P

3

0

TYPICAL

HC HCT

11 17 14

50 50 pF

n+x

, C

14 21 17

n+y

O

, C

) across

n+z

ns ns ns

UNIT

Notes

1. C

is used to determine the dynamic power dissipation (PD in µW):

PD

PD=CPD× V

2

× fi+∑(CL× V

CC

2

× fo) where:

CC

fi= input frequency in MHz fo= output frequency in MHz ∑ (CL× V

2

× fo) = sum of outputs

CC

CL= output load capacitance in pF VCC= supply voltage in V

2. For HC the condition is VI= GND to V

CC

For HCT the condition is VI= GND to VCC− 1.5 V

ORDERING INFORMATION

“74HC/HCT/HCU/HCMOS Logic Package Information”

See

December 1990 2

.

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

PIN DESCRIPTION

PIN NO. SYMBOL NAME AND FUNCTION

3, 1, 14, 5 4, 2, 15, 6 7 8 GND ground (0 V) 9C 10 11 C 12 C 13 C 16 V

G0 to G P0 to P

3

carry generate inputs (active LOW) carry propagate inputs (active LOW)

P carry propagate output (active LOW)

n+z

function output

G carry generate output (active LOW)

n+y n+x n CC

function output function output carry input (active HIGH) positive supply voltage

Fig.1 Pin configuration. Fig.2 Logic symbol.

December 1990 3

Fig.3 IEC logic symbol.

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

Fig.4 Functional diagram.

Fig.5 Logic diagram.

December 1990 4

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

FUNCTION TABLE

INPUTS OUTPUTS

G

C

n

X

H

L

H

X

L

H

X

H

L

H

X

L

H

X

H

L

H

X

L

H

X X

X X H

X X X L

P

0

H X X L

X H X X X L

X X H X

X X X L

H X X X L

G

0

P

1

G

1

P

2

G

2

P

3

C

3

n+x

C

n+y

C

n+z

G P

L L H H

H H H L X X

X H H H

X L X X

X X H H

X X L X

H X X X L L

X H X X

X X L L

X X H X

X X X L

X H X X L

H H H H

L X X X

X H H H

X L X X

H X X X

X L L L

X H X X

X X L L

X X H X L

H H H H

L X X X

H X X X

X L L L

X X X H L

L L L H H H

L L L L

H H H H

L L L L

H H H H L

Notes

1. H = HIGH voltage level L = LOW voltage level X = don’t care

December 1990 5

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”

Output capability: standard ICC category: MSI

AC CHARACTERISTICS FOR 74HC

GND = 0 V; t

= 6 ns; CL= 50 pF

r=tf

SYMBOL PARAMETER

t

PHL

/ t

propagation delay

PLH

Pn to P

t

PHL

/ t

propagation delay

PLH

Cn to any output

t

PHL

/ t

propagation delay

PLH

Pn to G

t

PHL

t

PHL

t

PHL

/ t

propagation delay

PLH

Pn to C

propagation delay

PLH

Gn to C

propagation delay

PLH

n+n

Gn to G

t

THL

/ t

output transition time 19

TLH

(°C)

T

amb

74HC

+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

30 14 11

55 20 16

47 17 14

44 16 13

41 15 12

7 6

120 24 20

170 34 29

145 29 25

135 27 23

75 15 13

150 30 26

215 43 37

180 36 31

170 34 29

95 19 16

180 36 31

255 51 43

220 44 38

205 41 35

110 22 19

.

UNIT

ns 2.0

TEST CONDITIONS

WAVEFORMS

V

CC

(V)

Fig.6

4.5

6.0 Fig.6

4.5

6.0 Fig.6

4.5

6.0 Fig.6

4.5

6.0 Fig.6

4.5

6.0 Fig.6

4.5

6.0 Fig.6

4.5

6.0

December 1990 6

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”

.

Output capability: standard ICC category: MSI

Note to HCT types

The value of additional quiescent supply current (∆I

) for a unit load of 1 is given in the family specifications.

CC

To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

INPUT UNIT LOAD COEFFICIENT

G0, G1, P0, P1, P G

3

G2, P3, C

n

1.50

2

0.30

1.25

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; t

= 6 ns; CL= 50 pF

r=tf

T

amb

(°C)

TEST CONDITIONS

74HCT

SYMBOL PARAMETER

+25 −40 to +85 −40 to +125

UNIT

V

(V)

CC

min. typ. max. min. max. min. max.

t

PHL

/ t

propagation delay

PLH

17 28 35 42 ns 4.5 Fig.6

Pn to P

t

PHL

/ t

propagation delay

PLH

26 43 54 65 ns 4.5 Fig.6

Cn to any output

t

PHL

/ t

propagation delay

PLH

20 33 41 50 ns 4.5 Fig.6

Pn to G

t

PHL

t

PHL

t

THL

/ t

propagation delay

PLH

Pn to C

propagation delay

PLH

Gn to C

output transition time 7 15 19 22 ns 4.5 Fig.6

TLH

n+n

, Gn to G

n+n

20 33 41 50 ns 4.5 Fig.6

18 32 40 48 ns 4.5 Fig.6

WAVEFORMS

December 1990 7

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

AC WAVEFORMS

(1) HC : VM= 50%; VI= GND to VCC.

= 1.3 V; VI= GND to 3 V.

HCT: V

M

Fig.6 Waveforms showing the input (Pn, Cn, Gn) to any output propagation delays and the output transition times.

APPLICATION INFORMATION

A and B inputs and F outputs of “181” are not shown.

Fig.7 16-bit ALU two-level look-ahead.

A and B inputs and F outputs of “181” are not shown.

Fig.8 32-bit ALU two-level look-ahead over 16-bit groups.

December 1990 8

Philips Semiconductors Product speciﬁcation

Look-ahead carry generator 74HC/HCT182

A and B inputs and F outputs of “181” are not shown.

Fig.9 Combined two-level look-ahead and ripple-carry ALU.

A and B inputs and F outputs of “181” are not shown.

Fig.10 64-bit ALU full-carry three-level look-ahead.

PACKAGE OUTLINES

See

“74HC/HCT/HCU/HCMOS Logic Package Outlines”

December 1990 9

.