W91473 Datasheet, PDF (17/20 Pages) Winbond – 14-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND LOCK FUNCTION

W91473 SERIES
Timing waveforms, continued
HKS
HFI
H KEY
HFO
ON HOOK
T/P MUTE
HIGH
HPM MUTE
CHIP ENBLE
Figure 3(c).
Note: Changing the state of the HKS signal from high to low will initialize the HFO and HPM MUTE signals.
HKS
LOW
KEY IN
DP
R
TKID
TRB
T_IDP
TPDP
TIDP
T/P MUTE
HPM MUTE
KT
DTMF
TFKP
OSC.
LOW
OSCILLATION
Figure 4. Pulse Mode One-key Redialing Timing Diagram (when not first key)
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Publication Release Date: February 1995
Revision A3