W91820ALN データシートの表示（PDF） - Winbond

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W91820ALN

13-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

Winbond 

W91820N SERIES

Pin Description, continued

SYMBOL 20-PIN 22-PIN I/O

FUNCTION

LOCK

5

(W91820LN/

820ALN only)

5

I The function of this terminal is to prevent "0" dialing and "9"

dialing under PABX system long distance call control. When

the first key input after reset is 0 or 9, all key inputs,

including the 0 or 9 key, become invalid and the chip

generates no output. The telephone is reinitialized by a

reset.

The function of the LOCK pin is shown below:

LOCK PIN

VDD

Floating

VSS

FUNCTION

"0", "9" dialing inhibited

Normal dialing Mode

"0" dialing inhibited

H/P MUTE

6

DP

12

DTMF

13

6

I The H/P MUTE is a conventional inverter output. During

pulse dialing, flash break or hold period, this output is active

high; otherwise, it remains in low state.

14 O N-channel open drain dialing pulse output.

Flash key will cause DP to be active in either tone mode or

pulse mode.

In lock mode, the DP remains low for 300 mS durint off-

hook delay time.

The timing diagram for pulse mode is shown in Figure 1(a,

b).

15 O During pulse dialing, this pin remains in a low state

regardless of the keypad input. In tone mode, it will output a

dual or single tone.

A detailed timing diagram for tone mode is shown in Figure

2(a, b).

OUTPUT FREQUENCY

Specified

Actual Error %

R1

697

699

+0.28

R2

770

766

-0.52

R3

852

848

-0.47

R4

941

948

+0.74

C1

1209

1216

+0.57

C2

1336

1332

-0.30

C3

1477

1472

-0.34

VDD, VSS

15, 7

17, 7

I Power input pins for the dialer chip. VDD is the power and

VSS is the ground.

-4-

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