W91031S Winbond Electronics, W91031S Datasheet - Page 25

• Manufacturer Part Number: W91031S
• Manufacturer: Winbond Electronics

Specifications of W91031S

• Process Technology: CMOS
• Operating Frequency (max): 3580kHz
• Mounting: Surface Mount
• Supply Current: 2.5mA
• Lead Free Status / Rohs Status: Not Compliant

Notes:
1. In a CPE where AC power is not available, the designer may choose to switch over to line power when the CPE goes
2. The FSKE pin should be set low to enable the alert tone detector when the dual tone alert signal is expected. The CPE has
3. FSKE may be set high as soon as the CPE has finished sending the acknowledge signal ACK.
4. FSKE should be set low when FCDN has become inactive.
5. For unsuccessful attempts where the end office does not send the FSK signal, the CPE should disable FSKE, unmute the
off-hook and use battery power while on-hook.
the capability to disable the CAS detection by setting FSKE always high during the on-hook state.
handset and enable the keypad after this interval has elapsed.
Tip/Ring
SLEEP
INTN
ALGO
FSKE
FCDN
FDRN
DCLK
DATA
CPE goes off-hook
Note 1
Figure 9-4. Input and Output Timing of Bellcore Off-hook Data Transmission
Note 2
t
A = 75 85 mS
C = 55 65 mS
E = 58 75 mS
G
REC
50 mS
CAS
A
CPE mutes handset & disables keypad
B
t
ABS
CPE sends
ACK
C
B = 0 100 mS
D = 0 500 mS
F = Depends on data length
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Note 3
Note 5
D
Mark
E
Publication Release Date: August 2000
Preliminary W91031
Message
Data
...
...
F
CPE unmutes handset
and enables keypad
Note 4
G
Revision A1