Silan
Semiconductorsꢀ
SC91650/1/2 A/B
ꢀ
(continued)
Pin No.
Pin Name
Description
650A/B 651A/B 652A/B
*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)
6
7
7
8
6
7
7
8
6
7
7
8
OSCI
OSCO
*When
is “LOW”, a valid key-in may turn on this oscillator and
HKS
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”.
8
9
9
8
9
9
8
9
9
XMUTE
*Long (continue) Mute.
10
10
10
VSS
VDD
*Negative power supply pin.
10 13 10 13 10 13
*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.
11 14 11 14 11 14
HKS
*When in OFF-HOOK state, th e
for all function operation.
*Pulse output signal pin.
pin must be pulled “low” state
HKS
*Inverter output structure (SC91650).
12 15 12 15 12 15
*The output is “LOW” during pulse dialing and Flash operation,
otherwise this output is “high”.
PO
*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.
13 16 13 16 13 16
TONE
MODE
*The TONE pin provides minimum tone duration (tTD) and minimum
intertone pause time to support rapid key-in. If key-in time is less than
tTD (100ms), DTMF signal will last for tTD (100ms); otherwise the tone
duration will last as long as the key is pressed.
*Mode select pin.
14 17 14 17 14 17
*Tri-state input structure.
*This pin can select following three modes.
(to be continued)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
ꢀ
REV: 1.0
2001.01.15ꢀ
9
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
