SN54ALS273, SN74ALS273

OCTAL D-TYPE FLIP-FLOPS

WITH CLEAR

SDAS218A – APRIL 1982 – REVISED DECEMBER 1994

Copyright  1994, Texas Instruments Incorporated

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• Contain 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

• Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic (N)

and Ceramic (J) 300-mil DIPs

description

These octal positive-edge-triggered flip-flops

utilize TTL circuitry to implement D-type flip-flop

logic with a direct-clear (CLR

) input.

Information at the data (D) inputs meeting the

setup-time requirements is transferred to the

Q outputs on the positive-going edge of the clock

(CLK) pulse. Clock triggering occurs at a particular

voltage level and is not directly related to the

transition time of the positive-going pulse. When

CLK is at either the high or low level, the D input

signal has no effect at the output.

The SN54ALS273 is characterized for operation

over the full military temperature range of –55°C

to 125°C. The SN74ALS273 is characterized for

operation from 0°C to 70°C.

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

CLR

CLK D

OUTPUT

Q

L X X L

H ↑ HH

H↑LL

HH or L X Q

0

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

CLR

1Q

1D

2D

2Q

3Q

3D

4D

4Q

GND

V

CC

8Q

8D

7D

7Q

6Q

6D

5D

5Q

CLK

SN54ALS273 ...J PACKAGE

SN74ALS273 . . . DW OR N PACKAGE

(TOP VIEW)

3212019

910111213

4

5

6

7

8

18

17

16

15

14

8D

7D

7Q

6Q

6D

2D

2Q

3Q

3D

4D

1D

1Q

CLR

5Q

5D

8Q

4Q

GND

CLK

V

CC

SN54ALS273 . . . FK PACKAGE

(TOP VIEW)

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

SN54ALS273, SN74ALS273

OCTAL D-TYPE FLIP-FLOPS

WITH CLEAR

SDAS218A – APRIL 1982 – REVISED DECEMBER 1994

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

1D

3

1D

11

CLK

C1

R

1

1Q

2

4

2D

2Q

5

7

3D

3Q

6

8

4D

4Q

9

13

5D

5Q

12

14

6D

6Q

15

17

7D

7Q

16

18

8D

8Q

19

CLR

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

logic diagram (positive logic)

CLK

1D

3

1D

C1

R

1Q

2

2D

4

1D

C1

R

2Q

5

3D

7

1D

C1

R

3Q

6

4D

8

1D

C1

R

4Q

9

5D

13

1D

C1

R

5Q

12

6D

14

1D

C1

R

6Q

15

7D

17

1D

C1

R

7Q

16

8D

18

1D

C1

R

8Q

19

CLR

11

1

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

‡

Supply voltage, V

CC

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, V

I

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

A

: SN54ALS273 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74ALS273 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

SN54ALS273, SN74ALS273

OCTAL D-TYPE FLIP-FLOPS

WITH CLEAR

SDAS218A – APRIL 1982 – REVISED DECEMBER 1994

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

SN54ALS273 SN74ALS273

UNIT

MIN NOM MAX MIN NOM MAX

UNIT

V

CC

Supply voltage 4.5 5 5.5 4.5 5 5.5 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 –1 –2.6 mA

I

OL

Low-level output current 12 24 mA

f

clock

Clock frequency 0 30 0 35 MHz

CLR low 10 10

t

w

Pulse duration

CLK high

16.5 14

ns

CLK low 16.5 14

t

Set p time before CLK↑

Data 10 10

ns

t

su

S

etup t

i

me

b

e

f

ore

CLK↑

CLR inactive state 15 15

ns

t

h

Hold time, data after CLK↑ 0 0 ns

T

A

Operating free-air temperature –55 125 0 70 °C

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS273 SN74ALS273

UNIT

PARAMETER

TEST

CONDITIONS

MIN TYP

†

MAX MIN TYP

†

MAX

UNIT

V

IK

V

CC

= 4.5 V, I

I

= –18 mA –1.5 –1.5 V

V

CC

= 4.5 V to 5.5 V, I

OH

= –0.4 mA V

CC

–2 V

CC

–2

V

OH

V

CC

=45V

I

OH

= –1 mA 2.4 3.3

V

CC

=

4

.

5

V

I

OH

= –2.6 mA 2.4 3.2

V

OL

V

CC

=45V

I

OL

= 12 mA 0.25 0.4 0.25 0.4

V

OL

V

CC

=

4

.

5

V

I

OL

= 24 mA 0.35 0.5

V

I

V

CC

= 5.5 V, V

I

= 7 V 0.1 0.1 mA

I

IH

V

CC

= 5.5 V, V

I

= 2.7 V 20 20 µA

I

IL

V

CC

= 5.5 V, V

I

= 0.4 V –0.2 –0.2 mA

I

O

‡

V

CC

= 5.5 V, V

O

= 2.25 V –20 –112 –30 –112 mA

I

CCH

V

CC

= 5.5 V 11 20 11 20 mA

I

CCL

V

CC

= 5.5 V 19 29 19 29 mA

†

All typical values are at V

CC

= 5 V, T

A

= 25°C.

‡

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

OS

.

Part #	SN54ALS273J
Description	OCTAL D-TYPE FLIP-FLOP, 20PIN CDIP
Category	IC
Availability	In Stock
Qty	1

SN54ALS273J

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