SN54AHCT74, SN74AHCT74

DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS

WITH CLEAR AND PRESET

SCLS263N – DECEMBER 1995 – REVISED JULY 2003

4

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C

SN54AHCT74

SN74AHCT74

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

VOH

IOH = –50 mA

45 V

4.4

4.5

4.4

4.4

V

VOH

IOH = –8 mA

4.5 V

3.94

3.8

3.8

V

VOL

IOL = 50 mA

45 V

0.1

0.1

0.1

V

VOL

IOL = 8 mA

4.5 V

0.36

0.44

0.44

V

II

VI = 5.5 V or GND

0 V to 5.5 V

±0.1

±1*

±1

mA

ICC

VI = VCC or GND,

IO = 0

5.5 V

2

20

20

mA

∆ICC†

One input at 3.4 V,

Other inputs at VCC or GND

5.5 V

1.35

1.5

1.5

mA

Ci

VI = VCC or GND

5 V

2

10

10

pF

* On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.

† This is the increase in supply current for each input at one of the specified TTL voltage levels, rather than 0 V or VCC.

(unless otherwise noted) (see Figure 1)

PARAMETER

TA = 25°C

SN54AHCT74

SN74AHCT74

UNIT

PARAMETER

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

t

Pulse duration

PRE or CLR low

5

5

5

ns

tw

Pulse duration

CLK

5

5

5

ns

t

Setup time before CLK

↑

Data

5

5

5

ns

tsu

Setup time before CLK

↑

PRE or CLR inactive

3.5

3.5

3.5

ns

th

Hold time, data after CLK

↑

0

0

0

ns

switching characteristics over recommended operating free-air temperature range,

PARAMETER

FROM

TO

LOAD

TA = 25°C

SN54AHCT74

SN74AHCT74

UNIT

PARAMETER

(INPUT)

(OUTPUT)

CAPACITANCE

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

f

CL = 15 pF

100**

160**

80**

80

MHz

fmax

CL = 50 pF

80

140

65

65

MHz

tPLH

PRE or CLR

QorQ

CL =15 pF

7.6**

10.4**

1**

12**

1

12

ns

tPHL

PRE or CLR

Q or Q

CL = 15 pF

7.6**

10.4**

1**

12**

1

12

ns

tPLH

CLK

QQ

CL =15 pF

5.8**

7.8**

1**

9**

1

9

ns

tPHL

CLK

Q or Q

CL = 15 pF

5.8**

7.8**

1**

9**

1

9

ns

tPLH

PRE

CLR

QQ

CL =50 pF

8.1

11.4

1

13

1

13

ns

tPHL

PRE or CLR

Q or Q

CL = 50 pF

8.1

11.4

1

13

1

13

ns

tPLH

CLK

QorQ

CL =50 pF

6.3

8.8

1

10

1

10

ns

tPHL

CLK

Q or Q

CL = 50 pF

6.3

8.8

1

10

1

10

ns

** On products compliant to MIL-PRF-38535, this parameter is not production tested.