CD54AC161, CD74AC161

4-BIT SYNCHRONOUS BINARY COUNTERS

SCHS239C – SEPTEMBER 1998 – REVISED MARCH 2003

8

POST OFFICE BOX 655303

timing requirements over recommended operating free-air temperature range (unless otherwise

noted)

VCC

–55

°C to

125

°C

–40

°C to

85

°C

UNIT

CC

MIN

MAX

MIN

MAX

1.5 V

7

8

fclock

Clock frequency

3.3 V

± 0.3 V

64

73

MHz

5 V

± 0.5 V

90

103

1.5 V

69

61

CLK high or low

3.3 V

± 0.3 V

7.7

6.8

t

Pulse duration

5 V

± 0.5 V

5.5

4.8

ns

tw

Pulse duration

1.5 V

63

55

ns

CLR low

3.3 V

± 0.3 V

7

6.1

5 V

± 0.5 V

5

4.4

↑

1.5 V

63

55

↑

A, B, C, or D

3.3 V

± 0.3 V

7

6.1

t

Setup time before CLK

↑

5 V

± 0.5 V

5

4.4

ns

tsu

Setup time, before CLK

↑

1.5 V

75

66

ns

LOAD

3.3 V

± 0.3 V

8.4

7.4

5 V

± 0.5 V

6

5.3

↑

1.5 V

0

0

↑

A, B, C, or D

3.3 V

± 0.3 V

0

0

th

Hold time after CLK

↑

5 V

± 0.5 V

0

0

ns

th

Hold time, after CLK

↑

1.5 V

0

0

ns

ENP or ENT

3.3 V

± 0.3 V

0

0

5 V

± 0.5 V

0

0

↑

↑

1.5 V

75

66

trec

Recovery time, CLR

↑ before CLK↑

3.3 V

± 0.3 V

8.4

7.4

ns

5 V

± 0.5 V

6

5.3