4.6 Timing Requirements (continued)

over recommended operating free-air temperature range (unless otherwise noted)

VCC

–55°C to 125°C

–40°C to 85°C

UNIT

MIN

MAX

MIN

MAX

tsu

Setup time, before CLK↑

A, B, C, or D

1.5 V

63

55

ns

3.3 V ± 0.3 V

7

6.1

5 V ± 0.5 V

5

4.4

LOAD

1.5 V

75

66

ns

3.3 V ± 0.3 V

8.4

7.4

5 V ± 0.5 V

6

5.3

th

Hold time

A, B, C, or D

1.5 V

0

0

ns

3.3 V ± 0.3 V

0

0

5 V ± 0.5 V

0

0

ENP or ENT

1.5 V

0

0

ns

3.3 V ± 0.3 V

0

0

5 V ± 0.5 V

0

0

trec

Recovery time, CLR↑ before CLK↑

1.5 V

75

66

3.3 V ± 0.3 V

8.4

7.4

5 V ± 0.5 V

6

5.3

4.7 Switching Characteristics

over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Parameter Measurement

Information)

PARAMETER

FROM (INPUT)

TO (OUTPUT

VCC

–55°C to 125°C

–40°C to 85°C

UNIT

MIN

MAX

MIN

MAX

fmax

1.5 V

7

8

MHz

3.3 V ± 0.3 V

64

73

5 V ± 0.5 V

90

103

tpd

CLK

RCO

1.5 V

–

209

–

190

ns

3.3 V ± 0.3 V

6

23.4

6

21

5 V ± 0.5 V

4.3

16.7

4.3

15.2

Any Q

1.5 V

–

207

–

188

3.3 V ± 0.3 V

5.9

23.1

5.9

21

5 V ± 0.5 V

4.2

16.5

4.2

15

ENT

RCO

1.5 V

–

129

–

117

3.3 V ± 0.3 V

3.6

14.4

3.7

13.1

5 V ± 0.5 V

2.6

10.3

2.7

9.4

CLR

Any Q

1.5 V

–

207

–

188

3.3 V ± 0.3 V

5.9

23.1

5.9

21

5 V ± 0.5 V

4.2

16.5

4.2

15

RCO

1.5 V

–

207

–

188

3.3 V ± 0.3 V

5.9

23.1

5.9

21

5 V ± 0.5 V

4.2

16.5

4.2

15

4.8 Timing Diagrams

The following sequence is illustrated below:

CD54AC161, CD74AC161

SCHS239D – NOVEMBER 1998 – REVISED MAY 2024

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