SC91650A SILAN [Silan Microelectronics Joint-stock], SC91650A Datasheet - Page 9

• Manufacturer Part Number: SC91650A
• Description: 13 MEMORY TONE / PULSE DIALER WITH REDIAL SAVE HANDFREE & HOLD FUNCTION
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

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HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Silan
Semiconductors
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XMUTE
MODE
OSCO
TONE
OSCI
HKS
VSS
VDD
PO
*Oscillator input & output pins.
*The 3.579545MHz oscillator is formed by a built-in inverter inside of
this chip and by connecting a 3.579545MHz crystal or a ceramic
resonator across the OSCI and OSCO pins. (built-in feedback resistor
and capacitor)
*When HKS is “LOW”, a valid key-in may turn on this oscillator and
generates a 3.579545 MHz clock.
*Mute output pins.
*NMOS open drain output structure.
*The output is in “LOW” state during dialing sequence (both Pulse
and Tone mode) and in Hold status otherwise this pin is
“high-impedance”.
*Long (continue) Mute.
*Negative power supply pin.
*Positive power supply pin.
*Hook switch input pin.
*When the handset is in ON-HOOK state, this pin must be pulled
“high” in order to disable the dialing operation and decrease the
power consumption.
*When in OFF-HOOK state, th e HKS pin must be pulled “low” state
for all function operation.
*Pulse output signal pin.
*Inverter output structure (SC91650).
*The output is “LOW” during pulse dialing and Flash operation,
otherwise this output is “high”.
*NMOS open drain output structure.
*Dual Tone Multi-frequency output pin.
*In TONE mode, when an entry of digit key (include *, # key), this pin
will send out a corresponding DTMF signal.
*The TONE pin provides minimum tone duration (t
intertone pause time to support rapid key-in. If key-in time is less than
t
duration will last as long as the key is pressed.
*Mode select pin.
*Tri-state input structure.
*This pin can select following three modes.
TD (
100ms), DTMF signal will last for t
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TD (
100ms); otherwise the tone
REV: 1.0
(to be continued)
TD
) and minimum
2001.01.15