SN54273, SN54LS273, SN74273, SN74LS273

OCTAL D-TYPE FLIP-FLOP WITH CLEAR

SDLS090 – OCTOBER 1976 – REVISED MARCH 1988

4

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

switching characteristics, VCC = 5 V, TA = 25°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fmax

Maximum clock frequency

C

30

40

MHz

tPHL

Propagation delay time, high-to-low-level output from clear

CL = 15 pF,

RL = 400 Ω

18

27

ns

tPLH

Propagation delay time, low-to-high-level output from clock

RL = 400 Ω,

See Note 3

17

27

ns

tPHL

Propagation delay time, high-to-low-level output from clock

See Note 3

18

27

ns

NOTE 3: Load circuits and voltage waveforms are shown in Section 1.

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

Supply voltage, VCC (see Note 1)

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage

7 V

. . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, TA: SN54LS273

– 55

°C to 125°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74LS273

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

– 65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NOTE 1: Voltage values are with respect to network ground terminal.

recommended operating conditions

SN54LS273

SN74LS273

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

Supply voltage, VCC

4.5

5

5.5

4.75

5

5.25

V

High-level output current, IOH

– 400

– 400

µA

Low-level output current, IOL

4

8

mA

Clock frequency, fclock

0

30

0

30

MHz

Width of clock or clear pulse, tw

20

20

ns

Setup time t

Data input

20

↑

20

↑

ns

Setup time, tsu

Clear inactive state

25

↑

25

↑

ns

Data hold time, th

5

↑

5

↑

ns

Operating free-air temperature, TA

–55

125

0

70

°C

↑ The arrow indicates that the rising edge of the clock pulse is used for reference.