W91F820N Datasheet, PDF (8/20 Pages) Winbond – 13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

Preliminary W91F820N SERIES
(F2), 73 mS (F3) or 100 mS (F4) and a pause time of 1.0 second, after which the next digit is dialed
out.
2. The flash key has the first priority of the keyboard function only one flash key will be released to
the user.
3. When the flash key is key in, the system will return to the initial state after the flash pause time is
finished.
4. The flash function timing diagram is shown in Figure 8.
Cascaded Dialing
OFF HOOK (or ON HOOK & _HFI
)
1. Normal Dialing + Repertory Dialing + Normal Dialing
(1st sequence)
(2nd sequence)
2. Repertory Dialing + Normal Dialing + Repertory Dialing
(1st sequence)
(2nd sequence)
3. Redialing + Normal Dialing + Repertory Dialing
(1st sequence)
(2nd sequence)
Redialing is valid only for the first key-in.
The second sequence should not be operated until the first sequence is dialed out completely.
Mute
OFF HOOK , MUTE
MUTE has an on/off toggle function. The functional timing diagram is shown in Figure 8 .
ABSOLUTE MAXIMUM RATING
PARAMETER
DC Supply Voltage
Input/Output Voltage
Power Dissipation
Operation Temperature
Storage Temperature
SYMBOL
VDD-VSS
VIL
VIH
VOL
VOH
PD
TOPR
TSTG
RATING
-0.3 to +7.0
VSS -0.3
VDD +0.3
VSS -0.3
VDD +0.3
120
-20 to +70
-55 to +150
UNIT
V
V
V
V
V
mW
°C
°C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
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