SN54ALS161B, SN54ALS163B, SN54AS161, SN54AS163

SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163

SYNCHRONOUS 4-BIT BINARY COUNTERS

SDAS024A – D2661, APRIL 1982 – REVISED MAY 1986

POST OFFICE BOX 655303

3

9

LOAD

CLR

1

ENT

10

ENP

7

CLK

2

A

3

B

4

C

5

D

6

CTRDIV16

3CT = 15

15

RCO

QA

14

QB

13

QC

12

QD

11

5CT=0

M1

M2

G3

G4

C5/2,3,4+

1,5D [1]

[2]

[4]

[8]

[8]

[4]

[2]

[1]

1,5D

C5/2,3,4+

G4

G3

M2

M1

CT=0

11

QD

12

QC

13

QB

14

QA

RCO

15

3CT = 15

CTRDIV16

6

D

5

C

4

B

3

A

2

CLK

7

ENP

10

ENT

1

CLR

LOAD

9

’ALS161B AND ’AS161 BINARY

COUNTERS WITH DIRECT CLEAR

’ALS163B AND ’AS163 BINARY

COUNTERS WITH SYNCHRONOUS CLEAR

’ALS163B and ’AS163 logic diagram (positive logic)

10

6

D

C

5

4

B

11

QD

1D

C1

12

QC

1D

C1

C1

1D

15

RCO

QA

14

QB

13

9

LOAD

CLR

1

ENT

ENP

7

CLK

2

A

3

1D

C1

† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for D, J, and N packages.

’ALS161B and ’AS161 synchronous binary counters are similar; however the clear is asynchronous as shown for the ’ALS160B and ’AS160 decade

counters.