W91F810ALN datasheet(4/26 Pages) WINBOND

Part #	W91F810ALN

Description	23-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

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Manufacturer	WINBOND [Winbond]

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W91F810N SERIES

- 4 -

Pin Description, continued

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

LOCK

(W91F810LN/

F810ALN/

F811ALN only)

6

7

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

FUNCTION

VDD

VSS

Floating

"0", "9" dialing inhibited

Normal dialing Mode

"0" dialing inhibited

H/P MUTE

7

8

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.

DP

13

15

18

O

N-channel open drain dialing pulse output.

Flash key will cause DP to be active in either tone

mode or pulse mode.

The timing diagram for pulse mode is shown in

Figure 1(a, b).

DTMF

14

16

19

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).

R1

R2

R3

R4

C1

C2

C3

Specified

697

770

852

941

1209

1336

1477

699

766

848

948

1216

1332

1472

Actual

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

Error %

OUTPUT FREQUENCY

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