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SC91214 Schematic ( Datenblatt PDF ) - Silan Microelectronics

Teilenummer SC91214
Beschreibung TONE/PULSE DIALER
Hersteller Silan Microelectronics
Logo Silan Microelectronics Logo 



Gesamt 16 Seiten
		
SC91214 Datasheet, Funktion
SC91214/91215 SERIES
T/P SWITCHABLE DIALER WITH REDIAL HANDFREE FUNCTION
DESCRIPTION
The SC91214/15 Series is a single-chip, silicon gate, CMOS
integrated circuit with an on-chip oscillator for a 3.58MHZ crystal or
ceramic resonator. It provides a dialing pulse (DP) or dual tone multi-
frequency (DTMF) dialing. A standard 4 X4 matrix keyboard can be used
to support either DP or DTMF modes.
FEATURES
* One touch redial operation
* Tone/Pulse switchable
* 32 digit capacity for redialing
* Automatic mixed redialing (last number redial) of pulse to DTMF with
multiple automatic access pauses
* PABX auto-pause is 2.2 seconds
ORDERING INFORMATION
* DTMF Timing:
Manual dialing: minimum duration for bursts and pauses
Redialing: calibrated timing
* Hands-Free control function
* Wide operating voltage range: 2V to 5.5V
* Key-in beep tone output
Part
SC91214/15A
SC91214/15B
SC91214/15C
SC91214/15D
Package
DIP-16 Package
DIP-18 Package
DIP-18 Package
DIP-20 Package
* Digits dialed manually after redialing are cascadable and stored as
additional digits for the next redialing
* Uses inexpensive ceramic resonator (3.58 MHZ)
* Two versions for different telephone systems
* Built-in power up reset circuit
* Four extra function keys: flash, pause, redial and DP or DTMF mixed
dialing
* 4 X 4 (or 2 X 8) keyboard can be used
* Low standby current
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0 2004.08.03
Page 1 of 16






SC91214 Datasheet, Funktion
SC91214/91215 SERIES
PIN DESCRIPTION
SC9121
4A
3
4
Pin No.
SC9121 SC9121
4B 4C
34
45
SC9121
4D
4
5
2233
Pin
Name
OSCI
OSCO
MODE
IN
Description
Oscillator Input and Output pins.
The time base for the SC91214/15 is a crystal
controlled on-chip oscillator, which is completed by
connecting a 3.58MHz crystal or ceramic
resonator between the OSCI and OSCO pins.
TRI-STATE mode select pin.
There ate two versions of the SC91214/15 as
follows:
a. SC91215 Series is for European and American
systems.
MODE IN
Tone/
Pulse
Dial
Rate
M/B
Ratio
VDD
Pulse 10pps
2/3
VSS
Tone
--
--
Floating
Pulse 10pps
1/2
b. The SC91214 Series is for the Japanese
system.
MODE IN
Tone/
Pulse
Dial
Rate
M/B
Ratio
VDD Pulse 10pps 1/2
VSS
Tone
--
--
Floating Pulse 20pps 1/2
The mode selection pin is checked for tone/pulse
dialing as each digit key entery. In the PULSE
mode, the dialing rate is checked, along with the
make/break ratio, at first key entry.
1122
(N.A.)
10
(N.A.)
11
HK Hook switch input
This inverter input pin detects the state of the hook
switch contact. “Off Hook”is represented by a VDD
condition.
KT Key-in tone output
This N-channel open drain pin sends out a “beep”
tone for each PULSE mode key entry, along with
entries of accepted function keys (RD, T, F1 F2,
an P keys). The tone output frequency is 437Hz
and tone duration is 23 ms.
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0 2004.08.03
Page 6 of 16

6 Page







SC91214 pdf, datenblatt
3. Timing diagram for SWITCHING mode operation:
(i) By mode selection pin switches
SC91214/91215 SERIES
(ii) By */T key entry
TPAU: Pause time (2.2 secs)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0 2004.08.03
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