Figure 9. Divide By 20/21 (MC12013)

13

12

10

15

+

–

C

E5

E4

E3

E2

E1

Q4

Q4

2

3

7

MECL

to

MTTL

Trans–

lator

E2 + E3 + E4 + E5 = 0

E2 + E3 + E4 + E5 = 1

To obtain an MTTL output, connect Pins 5 and 4 to Pins 2 and 3 respectively. Termination

resistors for the MECL outputs are not shown, but are required except for the flip–flop driving

the translator section.

The

B 20/21 counter may also be built using an MTTL flip–flop by connecting Pins 5 and

4 to Pins 2 and 3 respectively, and driving the MTTL flip–flop with Pin 7. MC12013 inputs

E4 and E5 are used rather than E1. With E1 + E2 + E3 = 0, operation remains as shown.

Q5

D

C

Q

Q

1/2 MC10131

11

9

5

4

Figure 10. Divide By 40/41 (MC12013)

13

12

11

10

9

15

5

4

+

–

C

E5

E4

E3

E2

E1

Q4

Q4

2

3

7

MECL

to

MTTL

Trans–

lator

D

C

Q

Q

For

B 40 : E4 + E5 = 1

For

B 41 : E4 + E5 = 0

Termination

resistors

for

MECL

outputs are not shown, but are

required except for the flip–flop

driving the translator section.

D

C

Q

Q

MC10131

MC12009 MC12011 MC12013

14

MOTOROLA RF/IF DEVICE DATA

COUNT

Q1

Q2

Q3

Q4

Q4

31

1

1

1

1

1

30

0

1

1

1

1

28

0

0

1

1

1

24

0

0

0

1

1

25

1

0

0

1

1

27

1

1

0

1

1

22

0

1

1

0

1

20

0

0

1

0

1

16

0

0

0

0

1

17

1

0

0

0

1

19

1

1

0

0

1

14

0

1

1

1

0

12

0

0

1

1

0

8

0

0

0

1

0

9

1

0

0

1

0

11

1

1

0

1

0

6

0

1

1

0

0

4

0

0

1

0

0

0

0

0

0

0

0

1

1

0

0

0

0

3

1

1

0

0

0