NSC DM54LS273J-883, DM54LS273J-MLS Datasheet

TL/F/9825

DM54LS273/DM74LS273 8-Bit Register with Clear

April 1992

DM54LS273/DM74LS273
8-Bit Register with Clear

General Description

The ’LS273 is a high speed 8-bit register, consisting of eight
D-type flip-flops with a common Clock and an asynchronous
active LOW Master Reset. This device is supplied in a 20­pin package featuring 0.3 inch row spacing.

Features

Y

Edge-triggered

Y

8-bit high speed register

Y

Parallel in and out

Y

Common clock and master reset

Connection Diagram

Dual-In-Line Package

TL/F/9825– 1

Order Number DM54LS273E, DM54LS273J,

DM54LS273W, DM74LS273M or DM74LS273N

See NS Package Number E20A, J20A, M20B,

N20A or W20A

Pin Names Description

CP Clock Pulse Input (Active Rising Edge)
D0–D7 Data Inputs
MR

Asynchronous Master Reset Input
(Active LOW)

Q0–Q7 Flip-Flop Outputs

C

1995 National Semiconductor Corporation RRD-B30M115/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

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

DM54LS273 DM74LS273

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

0.4

b

0.4 mA

I

OL

Low Level Output Current 4 8 mA

T

A

Free Air Operating Temperature

b

55 125 0 70

§

C

ts(H) Setup Time HIGH or LOW 15 15

ns

t

s

(L) Dnto CP 15 15

th(H) Hold Time HIGH or LOW 5 5

ns

th(L) Dnto CP 5 5

tw(H) CP Pulse Width HIGH or LOW 20 20

ns

t

w

(L) 20 20

tw(L) MR Pulse Width LOW 20 20 ns

t

rec

Recovery Time

15 15 ns

MR

to CP

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

V

OH

High Level Output V

CC

e

Min, I

OH

e

Max, DM54 2.5

V

Voltage V

IL

e

Max

DM74 2.7 3.4

V

OL

Low Level Output V

CC

e

Min, I

OL

e

Max, DM54 0.4

Voltage V

IH

e

Min

DM74 0.35 0.5 V

I

OL

e

4 mA, V

CC

e

Min DM74 0.25 0.4

I

I

Input Current@Max V

CC

e

Max, V

I

e

7V

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

0.4 mA

I

OS

Short Circuit V

CC

e

Max DM54

b

20

b

100

mA

Output Current (Note 2)

DM74

b

20

b

100

I

CC

Supply Current V

CC

e

Max 27 mA

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