NSC DM54LS240W-883, DM54LS240W-MLS, DM54LS240J-883, DM54LS240J-MLS, DM54LS240E-883 Datasheet

TL/F/6411

DM54LS240/DM74LS240, DM54LS241/DM74LS241

Octal TRI-STATE Buffers/Line Drivers/Line Receivers

April 1992

DM54LS240/DM74LS240,
DM54LS241/DM74LS241
Octal TRI-STATE

É

Buffers/Line Drivers/Line Receivers

General Description

These buffers/line drivers are designed to improve both the
performance and PC board density of TRI-STATE buffers/
drivers employed as memory-address drivers, clock drivers,
and bus-oriented transmitters/receivers. Featuring 400 mV
of hysteresis at each low current PNP data line input, they
provide improved noise rejection and high fanout outputs
and can be used to drive terminated lines down to 133X.

Features

Y

TRI-STATE outputs drive bus lines directly

Y

PNP inputs reduce DC loading on bus lines

Y

Hysteresis at data inputs improves noise margins

Y

Typical IOL(sink current)

54LS 12 mA
74LS 24 mA

Y

Typical IOH(source current)

54LS

b

12 mA

74LS

b

15 mA

Y

Typical propagation delay times

Inverting 10.5 ns
Noninverting 12 ns

Y

Typical enable/disable time 18 ns

Y

Typical power dissipation (enabled)

Inverting 130 mW
Noninverting 135 mW

Connection Diagrams

Dual-In-Line Package

TL/F/6411– 1

Dual-In-Line Package

TL/F/6411– 2

Order Number DM54LS240J,
DM54LS240W, DM54LS240E,

DM74LS240WM or DM74LS240N

See NS Package Number E20A, J20A,

M20B, N20A or W20A

Order Number DM54LS241J,

DM54LS241W, DM54LS241E,

DM74LS241WM or DM74LS241N

See NS Package Number E20A, J20A,

M20B, N20A or W20A

Function Tables

LS240

Inputs Output

G AY

LL H
LH L

HX Z

LS241

Inputs Outputs

GG1A 2A 1Y 2Y

XL L X L
XL H X H
XH X X Z
HX X L L
HX X H H

LX X X Z

L

e

Low Logic Level

H

e

High Logic Level

X

e

Either Low or High Logic Level

Z

e

High Impedance

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 7V

Operating Free Air Temperature Range

DM54LS, 54LS

b

55§Ctoa125§C

DM74LS 0

§

Ctoa70§C

Storage Temperature Range

b

65§Ctoa150§C

Note:

The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran­teed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.

Recommended Operating Conditions

Symbol Parameter

DM54LS240, 241 DM74LS240, 241

Units

Min Nom Max Min Nom Max

V

CC

Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

V

IH

High Level Input Voltage 2 2 V

V

IL

Low Level Input Voltage 0.7 0.8 V

I

OH

High Level Output Current

b

12

b

15 mA

I

OL

Low Level Output Current 12 24 mA

T

A

Free Air Operating Temperature

b

55 125 0 70

§

C

Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

Typ

Max Units

(Note 1)

V

I

Input Clamp Voltage V

CC

e

Min, I

I

eb

18 mA

b

1.5 V

HYS Hysteresis (V

T

a

b

V

T

b

)V

CC

e

Min

0.2 0.4 V

Data Inputs Only

V

OH

High Level Output Voltage V

CC

e

Min, V

IH

e

Min DM74

2.7

V

IL

e

Max, I

OH

eb

1mA

V

CC

e

Min, V

IH

e

Min DM54/DM74

2.4 3.4 V

V

IL

e

Max, I

OH

eb

3mA

V

CC

e

Min, V

IH

e

Min DM54/DM74

2

V

IL

e

0.5V, I

OH

e

Max

V

OL

Low Level Output Voltage V

CC

e

Min I

OL

e

12 mA DM74 0.4

V

IL

e

Max

I

OL

e

Max DM54 0.4 V

V

IH

e

Min

DM74 0.5

I

OZH

Off-State Output Current, V

CC

e

Max V

O

e

2.7V
20 mA

High Level Voltage Applied V

IL

e

Max

I

OZL

Off-State Output Current,

V

IH

e

Min

V

O

e

0.4V

b

20 mA

Low Level Voltage Applied

I

I

Input Current at Maximum V

CC

e

Max, V

I

e

7V (DM74)

0.1 mA

Input Voltage V

I

e

10V (DM54)

I

IH

High Level Input Current V

CC

e

Max, V

I

e

2.7V 20 mA

I

IL

Low Level Input Current V

CC

e

Max, V

I

e

0.4V

b

0.2 mA

I

OS

Short Circuit Output Current V

CC

e

Max (Note 2)

b

40

b

225 mA

I

CC

Supply Current V

CC

e

Max, Outputs High LS240, LS241 13 23

Outputs Open

Outputs Low LS240 26 44

LS241 27 46 mA

Outputs Disabled LS240 29 50

LS241 32 54

Note 1: All typicals are at V

CC

e

5V, T

A

e

25§C.

Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.

2