W91031 Datasheet, PDF (9/29 Pages) Winbond – LOW POWER CMOS INTERGRATED CIRCUIT

Preliminary W91031
Dual tone detected
W91031
Capacitor
Charge/Discharge
Control Circuit
+
-
Comparator
V ^CPth
VDD
Discharge
Switch
ALGRC
VDD
C
R
Charge
Switch
ALGR
ALGO
Figure 7-4. Guard Time Circuit of Dual Tone Alert Signal Detection
Tip/Ring
ALGR
ALGRC
ALGO
Discharge
Switch
Charge
Switch
Alerting Signal
t DP
t GP
VCPth
t REC
ON
ON
t DA
t GA
V CPth
t ABS
ON
Figure 7-5. Guard Time Waveform of ALGR, ALGRC and ALGO Pins
Publication Release Date: August 2000
-9-
Revision A1