MOTOROLA SN74LS245H, SN74LS245M, SN74LS245MEL, SN74LS245ML1, SN74LS245ML2 Datasheet

 Semiconductor Components Industries, LLC, 1999

December, 1999 – Rev. 6

1 Publication Order Number:

SN74LS245/D

SN74LS245

Octal Bus Transceiver

The SN74LS245 is an Octal Bus Transmitter/Receiver designed for
8-line asynchronous 2-way data communication between data buses.
Direction Input (DR) controls transmission of Data from bus A to bus
B or bus B to bus A depending upon its logic level. The Enable input
(E

) can be used to isolate the buses.

• Hysteresis Inputs to Improve Noise Immunity

• 2-Way Asynchronous Data Bus Communication

• Input Diodes Limit High-Speed Termination Effects

• ESD > 3500 Volts

LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)

18 17 16 15 14 13

123456

7

20 19

8

V

CC

DIR

E

B1 B2 B3 B5B4 B6

A1 A2 A3 A4 A5 A6 A7

910

A8 GND

12 11

B7 B8

TRUTH TABLE

INPUTS
E DIR

OUTPUT

L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X Isolation

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

Supply Voltage 4.75 5.0 5.25 V

T

A

Operating Ambient

T emperature Range

0 25 70 °C

I

OH

Output Current – High

–3.0 mA

–15 mA

I

OL

Output Current – Low 24 mA

LOW

POWER

SCHOTTKY

Device Package Shipping

ORDERING INFORMATION

SN74LS245N 16 Pin DIP 1440 Units/Box
SN74LS245DW 16 Pin

SOIC
DW SUFFIX
CASE 751D

http://onsemi.com

2500/Tape & Reel

PLASTIC
N SUFFIX
CASE 738

20

1

20

1

SN74LS245

http://onsemi.com

2

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol Parameter

Min Typ Max

Unit Test Conditions

V

IH

Input HIGH Voltage 2.0 V

Guaranteed Input HIGH Voltage for
All Inputs

V

IL

Input LOW Voltage

0.8
V

Guaranteed Input LOW Voltage for
All Inputs

VT+–V

T–

Hysteresis 0.2 0.4 V VCC = MIN

V

IK

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

p

2.4 3.4 V VCC = MIN, IOH = –3.0 mA

VOHOutput HIGH Voltage

2.0 V VCC = MIN, IOH = MAX

p

0.25 0.4 V IOL = 12 mA

VCC = VCC MIN,

VOLOutput LOW Voltage

0.35 0.5 V IOL = 24 mA

V

IN

=

V

IL

or

V

IH

per Truth Table

I

OZH

Output Off Current HIGH 20 µA VCC = MAX, V

OUT

= 2.7 V

I

OZL

Output Off Current LOW –200 µA VCC = MAX, V

OUT

= 0.4 V

A or B, DR or
E

20 µA VCC = MAX, VIN = 2.7 V

I

IH

Input HIGH Current

DR or E 0.1 mA VCC = MAX, VIN = 7.0 V
A or B 0.1 mA VCC = MAX, VIN = 5.5 V

I

IL

Input LOW Current –0.2 mA VCC = MAX, VIN = 0.4 V

I

OS

Output Short Circuit Current (Note 1) –40 –225 mA VCC = MAX
Power Supply Current

Total, Output HIGH

70

I

CC

Total, Output LOW 90

mA VCC = MAX

Total at HIGH Z 95

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

AC CHARACTERISTICS (T

A

= 25°C, VCC = 5.0 V, T

RISE/TFALL

≤ 6.0 ns)

Limits

Symbol Parameter

Min Typ Max

Unit Test Conditions

t

PLH

t

PHL

Propagation Delay , Data to Output

8.0

8.0

12
12

ns

=

p

t

PZH

Output Enable Time to HIGH Level 25 40 ns

C

L

= 45 F,

R

L

= 667 Ω

t

PZL

Output Enable Time to LOW Level 27 40 ns

t

PLZ

Output Disable Time from LOW Level 15 25 ns

CL = 5.0 pF,

t

PHZ

Output Disable Time from HIGH Level 15 25 ns

L

RL = 667 Ω