INTEGRAL IN74ALS273N, IN74ALS273DW Datasheet

TECHNICAL DATA

OCTAL D-TYPE FLIP-FLOP WITH CLEAR

• Contains Eight Flip-Flops with Single-Rail Outputs

• Buffered Clock and Direct Clear Inputs

• Individual Data Input to Each Flip-Flop

• Applications Include:

Buffer/Storage Registers
Shift Registers
Pattern Generators

DESCRIPTION

This monolithic, positive-edge-triggered flip-flop
utilizes TTL circuitry to implement D-type flip-flop
logic with a direct clear input.
Information at the D inputs meeting the setup time
requirements is transferred to the Q outputs on the
positive-going edge of the clock pulse. Clock
triggering occurs at a particular voltage level and is not
directly related to the transition time of the positive­going pulse. When the clock inputs is at either the high
or low level, the D input signal has no effect at the
output.
The IN74ALS273 is characterized for operation from
0oC to 70oC.

ORDERING INFORMATION

IN74ALS273N Plastic

IN74ALS273DW SOIC

T

A

= 0° to 70° C for all

packages

Function Table and Logic Symbol

(each flip-flop)

INPUTS OUTPUT

CLEAR CLOCK D Q

L
H
H
H

X

I
I

L

X
H

L

X

L

H

L

Q

o

IN74ALS273

CLR

CLK

(1)

(18)

(11)

(3)

(4)

(7)

(17)

(8)

(13)

(14)

(2)

(5)

(6)
(9)

(12)

(15)

(16)

(19)

1D
2D

3D
4D

5D
6D

8Q

7D
8D

7

Q

6Q

5Q

4Q

3

Q

2

Q

1Q

1D

IN74ALS273

2

ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR
TEMPERATURE RANGE

Supply voltage, Vcc 7V
Input voltage, Vl 7V
Operating free-air temperature range, TA 0oC to 70oC
Storage temperature range-65

o

C to 150oC

RECOMMENDED OPERATING CONDITIONS

MIN NOM MAX UNIT

V

CC

Supply voltage 4.5 5 5.5 V

V

IH

High-level input voltage2V

V

IL

Low-level input voltage 0.8 V

I

OH

High-level output current -2.6 mA

I

OL

Low-level output current 24 mA

f

clock

Clock frequenc

y

035MHz

CLR low 10

t

W

Pulse duration CLK high 14 ns
CLK low 14

t

su

Setup time Data 10 ns
before CLKI Clear inactive state 15 ns

t

l

y

Hold time, data after CLKI 0 ns

T

A

Operating free-air temperature 0 70

o

C

ELECTRICAL CHARACTERISTICS OVER RECOMMENDED OPERATING FREE­AIR TEMPERATURE RANGE

Parameter Test Conditions MIN TYP** MAX UNIT
V

IK

VCC= 4.5V II =-18mA -1.5 V

V

OH

VCC= 4.5V to 5.5V IOH =-0.4mA VCC-2 V
VCC= 4.5V IOH =-2.6mA 2.4 3.2

V

OL

VCC= 4.5V IOL =12mA 0.25 0.4 V

IOL =24mA 0.35 0.5 V

I

I

VCC= 5.5V VI =7V 0.1 mA

I

IH

VCC= 5.5V VI =2.7V 20

µ

A

I

IL

VCC= 5.5V VI =0.4V -0.2 mA

IO*V

CC

= 5.5V VO=2.25V -30 -112 mA

I

CCH

VCC= 5.5V 11 20 mA

I

CCL

VCC= 5.5V 19 29 mA

*-The output conditions have been chosen to produce a current that closely approximates one half of the true
short-circuit output current, I

OS

**-All typical values are at VCC=5V, TA=25oC