Pin Assignment

No. 5561-2/11

LC73701M

Pin Functions

Pin No.

Pin

I/O

Pin function

1

CE

I

Set high when data is valid. This signal is also used when DTMF signals are issued consecutively in DTMF mode. The last

DTMF signal is output until CE goes low.

2

CK

I

Data acquisition clock. Data is acquired on the rising edge of this signal.

3NC

4

DATA

I

Input for the 8-bit data.

5

RES

I

Reset input. Apply a low level to this input to reset dialer operation when, for example, power is first applied.

6

BUSYOUT

O

Outputs a high level during dialer operation, including during pauses. This is a complementary output.

7

OSCI

I

Oscillator circuit connections. Connect either a crystal or ceramic 4.194304 MHz oscillator element to these pins.

8

OSCO

O

Power supply

10

11

BMR

I

Make ratio switching input. High: 33%, Low: 39%

12

NC

13

TEST

I

LSI internal test pin. This pin either must be left open or must be tied low during normal operation.

14

DTMF

O

DTMF output. This is an npn emitter-follower output.

15

MUTE2

O

DTMF mute output. This is an n-channel open-drain output.

16

MUTE

O

DP and DTMF mute output. This is an n-channel open-drain output.

17

MUTE1

O

DP mute output. This is an n-channel open-drain output.

18

DP

O

DP output. This can be either an n-channel open-drain output or a complementary output.

DTMF