Datasheet SN74ls640 Datasheet

INPUTS

LS640

LS641

SN54/74LS640 SN54/74LS641

OCTAL BUS TRANSCEIVERS

These octal bus transceivers are designed for asynchronous two-way communication between data buses. Control function implementation minimizes external timing requirements. These circuits allow data transmission from the A bus to B or from the B bus to A bus depending upon the logic level of the direction control (DIR) input. Enable input (G device so that the buses are effectively isolated.

DEVICE OUTPUT LOGIC

LS640 3-State Inverting LS641 Open-Collector True LS642 Open-Collector Inverting LS645 3-State True

FUNCTION TABLE

CONTROL

LS640 LS641

G DIR

L L B data to A bus B data to A bus L H A data to B bus A data to B bus

H X Isolation Isolation

H = HIGH Level, L = LOW Level, X = Irrelevant

LS642

OPERATION

) can disable the

LS645

SN54/74LS642 SN54/74LS645

OCT AL BUS TRANSCEIVERS

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

20

1

20

1

20

1

CASE 732-03

N SUFFIX

PLASTIC

CASE 738-03

DW SUFFIX

CASE 751D-03

SOIC

ENABLE

V

CC

20 19

123456

DIR

B1 B2 B3 B5B4 B6

G

18 17 16 15 14 13

A1 A2 A3 A4 A5 A6 A7

SN54/74LS640 SN54/74LS642

CONNECTION DIAGRAMS DIP (TOP VIEW)

ENABLE

V

CC

20 19

123456

DIR

B1 B2 B3 B5B4 B6

G

18 17 16 15 14 13

A1 A2 A3 A4 A5 A6 A7

7

B7 B8

8

12 11

910

A8 GND

SN54/74LS641 SN54/74LS645

FAST AND LS TTL DATA

5-1

ORDERING INFORMATION

SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC

B7 B8

12 11

8

7

910

A8 GND

SN54/74LS640 • SN54/74LS645

OH

pg

VILI

LOW Volt

V

Guaranteed Input LOW Voltage for VOHOutput HIGH Volt

VOLOutput LOW Volt

V

IH

p

CL 45 pF,

C

F

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

T

A

I

OH

I

OL

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Symbol Parameter

V

IH

V

IK

I

OZH

I

OZL

I

IH

I

IL

I

OS

I

CC

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

AC CHARACTERISTICS (T

Symbol Parameter

t

PLH

t

PHL

t

PLH

t

PHL

t

PZL

t

PZH

t

PZL

t

PZH

t

PLZ

t

PHZ

t

PLZ

t

PHZ

Supply Voltage 54

Operating Ambient Temperature Range 54

Output Current — High

Output Current — Low 54

Limits

Min Typ Max

Input HIGH Voltage 2.0 V

nput

Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA

Output Off Current HIGH 20 µA VCC = MAX, V Output Off Current LOW –400 µA VCC = MAX, V

Input HIGH Current

Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V Output Short Circuit Current (Note 1) –40 –225 mA VCC = MAX Power Supply Current

Total Output HIGH Total, Output LOW Total at HIGH Z

Propagation Delay A to B

Propagation Delay B to A

Output Enable Time G

, DIR to A

Output Enable Time G, DIR to B

Output Disable Time G

, DIR to A

Output Disable Time G

, DIR to B

age

A or B, DIR or G DIR or G A or B

= 25°C, VCC = 5.0 V)

A

54 0.5 74 0.6

54, 74 2.4 3.4 V VCC = MIN, IOH = 3.0 mA 54, 74 2.0 V

54, 74 0.25 0.4 V IOL = 12 mA

74 0.35 0.5 V IOL = 24 mA

Limits

LS640 LS645

Min Typ Max Min Typ Max

6.0

8.01015

6.0

8.01015 312340

40

312340

40

151525

25

151525

25

74

54, 74 –3.0 mA

54 74

74

20 µA VCC = MAX, VIN = 2.7 V

0.1 mA VCC = MAX, VIN = 7.0 V

0.1 mA VCC = MAX, VIN = 5.5 V

70 90 95

8.01115

312640

151525

4.5

4.75 –55

0

Unit Test Conditions

Guaranteed Input HIGH Voltage for All Inputs

Guaranteed Input LOW Voltage for All Inputs

VCC = MIN, IOH = MAX

mA VCC = MAX

Unit Test Conditions

ns

15

ns

15

ns

40

ns

40

ns

25

ns

25

5.0

5.0 25

25

5.25 125

–12 –15

VCC = VCC MIN,

=

IN

per Truth Table

= 2.7 V

OUT

= 0.4 V

OUT

CL = 45 pF, RL = 667 Ω

= 5.0 p

L

5.5

70

12 24

or

IL

IH

V

°C

mA

FAST AND LS TTL DATA

5-2

SN54/74LS641 • SN54/74LS642

VILI

LOW Volt

V

pg

VOLOutput LOW Volt

V

IIHI

HIGH C

t

L

p,

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

T

A

V

OH

I

OL

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Symbol Parameter

V

IH

V

IK

I

OH

I

IL

I

CC

Supply Voltage 54

Operating Ambient Temperature Range 54

Output Current — High 54, 74 5.5 V Output Current — Low 54

Limits

Min Typ Max

Input HIGH Voltage 2.0 V

nput

Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA Output HIGH Current 54, 74 100 µA VCC = MIN, VOH = MAX

nput

Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V Power Supply Current

Total, Output HIGH Total, Output LOW Total at HIGH Z

age

urren

54 0.5 74 0.6

54, 74 0.25 0.4 V IOL = 12 mA

74 0.35 0.5 V IOL = 24 mA

74

20 µA VCC = MAX, VIN = 2.7 V

–0.1 mA VCC = MAX, VIN = 7.0 V

70 90 95

4.5

4.75 –55

0

Unit Test Conditions

Guaranteed Input HIGH Voltage for All Inputs

Guaranteed Input LOW Voltage for All Inputs

mA VCC = MAX

5.0

5.0 25

25

5.5

5.25 125

70

12 24

VCC = VCC MIN,

=

IN

IL

per Truth Table

or

IH

V

°C

mA

AC CHARACTERISTICS (T

Symbol Parameter

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

Propagation Delay, A to B

Propagation Delay, B to A

Propagation Delay, G, DIR to A

Propagation Delay, G, DIR to B

= 25°C, VCC = 5.0 V)

A

Min Typ Max Min Typ Max

Limits

LS641 LS642

171625

25

171625

25

233440

50

253740

50

191425

264340

283940

FAST AND LS TTL DATA

5-3

Unit Test Conditions

ns

25

ns

25

ns

60

ns

60

CL = 45 pF, RL = 667 Ω