SN74AHCT74QQ1

DUAL POSITIVEEDGETRIGGERED DTYPE FLIPFLOP

WITH CLEAR AND PRESET

SGDS008B − MAY 1998 − REVISED APRIL 2008

4

POST OFFICE BOX 655303

timing requirements over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 1)

PARAMETER

TA = 25°C

MIN

MAX

UNIT

PARAMETER

MIN

MAX

MIN

MAX

UNIT

tw

Pulse duration

PRE or CLR low

5

5

ns

tw

Pulse duration

CLK

5

5

ns

tsu

Setup time before CLK

↑

Data

5

5

ns

tsu

Setup time before CLK

↑

PRE or CLR inactive

3.5

3.5

ns

th

Hold time, data after CLK

↑

0

0

ns

switching characteristics over recommended operating free-air temperature range,

PARAMETER

FROM

TO

LOAD

TA = 25°C

MIN

MAX

UNIT

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

LOAD

CAPACITANCE

MIN

TYP

MAX

MIN

MAX

UNIT

fmax

CL = 15 pF

100

160

80

MHz

fmax

CL = 50 pF

80

140

65

MHz

tPLH

PRE or CLR

Q or Q

CL = 15 pF

7.6

10.4

1

12

ns

tPHL

PRE or CLR

Q or Q

CL = 15 pF

7.6

10.4

1

12

ns

tPLH

CLK

Q or Q

CL = 15 pF

5.8

7.8

1

9

ns

tPHL

CLK

Q or Q

CL = 15 pF

5.8

7.8

1

9

ns

tPLH

PRE or CLR

Q or Q

CL = 50 pF

8.1

11.4

1

13

ns

tPHL

PRE or CLR

Q or Q

CL = 50 pF

8.1

11.4

1

13

ns

tPLH

CLK

Q or Q

CL = 50 pF

6.3

8.8

1

10

ns

tPHL

CLK

Q or Q

CL = 50 pF

6.3

8.8

1

10

ns

PARAMETER

MIN

MAX

UNIT

VOL(P)

Quiet output, maximum dynamic VOL

0.8

V

VOL(V)

Quiet output, minimum dynamic VOL

−0.8

V

VOH(V)

Quiet output, minimum dynamic VOH

4

V

VIH(D)

High-level dynamic input voltage

2

V

VIL(D)

Low-level dynamic input voltage

0.8

V

NOTE 4: Characteristics are for surface-mount packages only.

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance

No load,

f = 1 MHz

32

pF