MC145436A

MOTOROLA

6

Ain

Vin t VDD

VDD

10 pF

100 k

Ω

0.01

µF

Ain

10 pF

VDD

100 k

Ω

7

7

Figure 2. Analog Input (Operational Information Based on PDIP Package)

Vin u VDD

3.58 MHz

Xin

Xout

VDD

ATB

Xen

1 M

Ω

ATB

Xen

TO OTHER

MC145436As

MC145436A

MC145436A

VDD

Xin

Figure 3. Multiple MC145436As

COL 1

COL 2

COL 3

COL 4

697

770

852

941

STD

DTMF

(Hz)

ROW 1

ROW 2

ROW 3

ROW 4

1209

1336

1477

1633

1

2

3

A

4

5

6

B

7

8

9

C

*

0

#

D

STD DTMF (Hz)

Figure 4. 4

× 4 Keyboard Matrix