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W91442N

10-MEMORY TONE/PULSE DIALER WITH SAVE FUNCTION

Winbond 

W91440N SERIES

AC Characteristics, continued

PARAMETER

SYMBOL

CONDITIONS

MIN. TYP. MAX. UNIT

Flash Pause Time

TFP F1, F2, F3, F4

-

1.0

-

S

Pause Time

TP

-

3.6

-

S

On-hook Debounce

Time

TOHD

-

150

-

S

Notes:

1. Crystal parameters suggested for proper operation are Rs < 100 ohms, Lm = 96 mH, Cm = 0.02 pF, Cn = 5 pF, Cl = 18 pF,

FOSC. = 3.579545 MHz ±0.02%.

2. Crystal oscillator accuracy directly affects these times.

TIMING WAVEFORMS

HKS

KEY IN

DP

T/P MUTE

DTMF

OSC.

3

TKID

4

TIDP M B

TPDP

2

TIDP M B

TIDP

TKRD

2

TKID

TIDP

TPDP

Low

OSCILLATION

OSCILLATION

Figure 1(a) Normal Dialing Timing Diagram

Publication Release Date: May 1997

-9-

Revision A3

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