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
* 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
* 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
ORDERING INFORMATION
Part
SC91214/15A
SC91214/15B
SC91214/15C
SC91214/15D
Package
DIP-16 Package
DIP-18 Package
DIP-18 Package
DIP-20 Package
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 1 of 16
SC91214/91215 SERIES
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
(T
amb
=25°C, All voltage referenced to V
SS
, unless otherwise specified)
Characteristics
Power Supply Voltage
Input Voltage
Output Voltage
Output Voltage (DP, XMIT MUTE)
Tone Output Current
Power Dissipation
Operating Temperature
Storage Temperature
Symbol
V
DD
V
IN
V
OUT
V
OUT
I
TONE
P
D
T
opr
T
stg
Value
6.0
-0.3~V
DD
+0.3
-0.3~V
DD
+0.3
1.2
50
500
-25~+70
-55~+150
Unit
V
V
V
V
mA
mW
°C
°C
Note:
Stresses above those listed under “
Absolute Maximum Ratings”may cause permanent damage to this
device. These are stress ratings only. Functional operation of this device at these or any other conditions
above those indicated in the operational sections of this specification is not implied or intended. Exposure
to the absolute maximum rating conditions for extended periods may affect device reliability.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 2 of 16
SC91214/91215 SERIES
AC ELECTRICAL CHARACTERISTICS
(T
op
=25°C, V
DD
=3.5V, V
SS
=0V, f
osc
=3.579545MHz, All voltage
referenced to V
SS
, unless otherwise specified)
Characteristics
Operating Voltage
Memory Retention Voltage
Memory Retention Current
Operating Current
Symbol
V
DD
V
MR
I
MR
I
DDP
I
DDT
I
SO
V
IH
V
IL
I
R
V
OC
V
OR
| I
HFI
|
| I
OH1
|
Column
Row
V
DD
=3.5V, R
L
=5K
584
456
V
DD
=1.0V,
HK
=V
DD
All outputs unloaded
Pulse mode
Tone mode
HK
=V
SS
Conditions
Tone mode
Pulse mode
Min.
2.0
2.0
1
Typ.
--
--
Max.
5.5
5.5
Unit
V
V
Test
KT.
A
--
--
A
0.05
0.32
0.6
0.03
0.5
0.8
0
115
730
570
5
0.4
2
0.4
1.0
2.0
0.05
10
1
0.2
µA
mA
µA
V
DD
µA
All outputs unloaded
Standby Current
HK
=V
DD
=1.5V All outputs unloaded,
no key selected
A
Input Voltage
R1
-
R4
Input Current
C
D
Tone out Voltage
HFI
Pull Low Current
876
684
mV
p-p
µA
mA
V
DD
=3.5V (Note 1)
HFI
pin connected to 0V
B
B
HFO Drive Current
HFO,
KT
, MODEOUT
XMITMUTE
Sink Current
V
DD
=3.5V
V
OH
=V
DD
-0.4V
V
DD
=3.5V
V
OL
=0.4V
V
DD
=3.5V, V
OL
=0.4V
* see note below
+
Vn )
2 1/2
I
OL1
I
OL2
DIS%
0.9
1.1
5.3
5.3
1
5
mA
mA
%
B
B
DP
Sink Current
Distortion
2
* Note:
DIS%
=
100 X ( V1
+
V 2
+
( VIL
+
VIH )
2
2
2 1/2
1. V
1
…
V
n
are the intermediation or the harmonic frequencies in the 500Hz to 3400Hz band.
2. V
IL
and V
IH
are the individual frequency components of the DTMF signal.
AC CHARACTERISTICS
(T
op
=25°C, V
DD
=3.5V, V
SS
=0V, f
osc
=3.579545MHz, All voltage referenced to V
SS
,
unless otherwise specified)
Characteristics
Symbol
Conditions
10pps
Make Time
T
M
20pps
M/B=1/2
M/B=2/3
M/B=1/2
M/B=2/3
Min.
Typ.
33.3
40.0
16.7
20.0
(To be continued)
Max.
Unit
ms
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 3 of 16
SC91214/91215 SERIES
(Continued)
Characteristics
Symbol
Conditions
10pps
M/B=1/2
M/B=2/3
M/B=1/2
M/B=2/3
10pps
20pps
Min.
Typ.
66.6
60.0
33.3
30.0
824
458
2.2
2.2
0
21
5.2
23
437
90
100
90
100
Max.
Unit
Break Time
T
B
20pps
ms
Inter-digit Pause Time
Pause Time
Auto-redial Break Time
Delay Time Key Valid to Signal
Out
Key-in Debounce
Key Release Debounce Time
Key-in Tone Duration
Key-in Tone Frequency
Minimum Tone Duration Time
Min. Tone Inter-digit Pause
Redial Tone Duration
Redial Tone Inter-digit Duration
T
IDP
T
PAU
T
AOBK
T
D
T
KD
T
KLD
T
KTD
F
KT
T
MFD
T
TIDP
T
MFDR
T
TIDPR
ms
sec
sec
ms
ms
ms
ms
Hz
ms
ms
ms
ms
COMPARISONS OF SPECIFIED VS ACTUAL TONE FREQUENCIES
(f
osc
=3.579MHz)
R/C
R1
R2
R3
Spec.
697
770
852
941
1,29
1,336
1,477
Actual
699.1
771.5
852.3
942.0
1,215.7
1,331.7
1,471.9
Error (%)
+0.31
+0.19
+0.03
+0.10
+0.57
-0.32
-0.35
Unit
Hz
Hz
Hz
Hz
Hz
Hz
Hz
R4
C1
C2
C3
KEYBOARD ASSIGNMENT
1) */T: In PULSE mode this key works as Pulse→DTMF key (T key). In DTMF mode the key works as * key.
*/T key will occupy one memory digit in either use.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 4 of 16
SC91214/91215 SERIES
2) F1: Flash key. The break time is 297 ms or 96 ms (SC91214/15 respectively)
3) F2: Flash key for break time 640 ms
4) P: Pause key (2.2 seconds)
5) RD: One key redial key
6) EMn: One touch memory key
7) #: In PULSE mode this key input is neglected. In DTMF mode this key works as # key.
PIN CONFIGURATION
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 5 of 16
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