SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, SN54AS163

SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163

SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS

SDAS276A – DECEMBER 1994 – REVISED JULY 2000

10

POST OFFICE BOX 655303

timing requirements over recommended operating conditions (see Figure 1)

SN54AS161

SN54AS163

SN74AS161

SN74AS163

UNIT

MIN

MAX

MIN

MAX

fclock

Clock frequency

65

75

MHz

t

Pulse duration

CLR high or low

7.7

6.7

ns

tw

Pulse duration

’AS161

CLR low

10

8

ns

↑

A, B, C, D

10

8

↑

LOAD

10

8

t

Setup time before CLK

↑

ENP, ENT

10

8

ns

tsu

Setup time, before CLK

↑

’AS161

CLR inactive

10

8

ns

’AS163

CLR low

14

12

’AS163

CLR high (inactive)

10

9

th

Hold time, all synchronous inputs after CLK

↑

2

0

ns

switching characteristics over recommended operating conditions (see Figure 1)

PARAMETER

FROM

TO

SN54AS161

SN74AS161

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

UNIT

fmax

65*

75

MHz

tPLH

CLK

RCO (with LOAD high)

1

8.5

1

8

ns

tPLH

CLK

RCO (with LOAD low)

3

17.5

3

16.5

ns

tPHL

CLK

RCO

2

14

2

12.5

ns

tPLH

CLK

Any Q

1

7.5

1

7

ns

tPHL

CLK

Any Q

2

14

2

13

ns

tPLH

ENT

RCO

1.5

10

1.5

9

ns

tPHL

ENT

RCO

1

9.5

1

8.5

ns

tPHL

CLR

Any Q

2

14

2

13

ns

tPHL

CLR

RCO

2

14

2

12.5

ns

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

switching characteristics over recommended operating conditions (see Figure 1)

PARAMETER

FROM

TO

SN54AS163

SN74AS163

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

UNIT

fmax

65*

75

MHz

tPLH

CLK

RCO (with LOAD high)

1

8.5

1

8

ns

tPLH

CLK

RCO (with LOAD low)

3

17.5

3

16.5

ns

tPHL

CLK

RCO

2

14

2

12.5

ns

tPLH

CLK

Any Q

1

7.5

1

7

ns

tPHL

CLK

Any Q

2

14

2

13

ns

tPLH

ENT

RCO

1.5

10

1.5

9

ns

tPHL

ENT

RCO

1

9.5

1

8.5

ns

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