SC91710A/B
T/P SWITCHABLE DIALER WITH REDIAL HANDFREE FUNCTION
DESCRIPTION
The SC91710A/B are Tone/Pulse switchable dialer which are fabricated
in COMS technology with wide operating voltage for both tone and pulse
mode, and consumes very low memory retention current in ON-HOOK
state.
FEATURES
* Tone/Pulse switchable dialer
* One 32-digit last number redial memory
* Pulse-to-tone (P→T) is provided for PBX operation
* Flash key is available
* Minimum tone duration is 98ms or 83ms
* Minimum intertone pause is 98ms or 83ms
* Redial Pause time (0ms)
* Uses 3.579549MHz crystal or ceramic resonator
* Many options can be selected
Mode (10PPS; 20PPS; Tone)
M/B ratio (40:60;33:66)
Pause time (3.6s)
* Flash function (RESET)
(P→T) pause time (3.6s)
Flash time (600ms; 300ms; 100ms; or 80ms)
* Power on reset circuit is provided
* Handfree function is provided for speaker phone application
* Packaged in 16-DIP or 18-DIP
ORDERING INFORMATION
Device
SC91710A
Package
DIP-16-300-2.54
SC91710AS SOP-16-225-1.27
SC91710B
DIP-18-300-2.54
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.03.07
Page 1 of 18
SC91710A/B
BLOCK DIAGRAM
Kernel Control CKT.
KEYBOARD ASSIGNMENT
C1
R1
R2
R3
R4
1
4
7
*
C2
2
5
8
0
C3
3
6
9
#
C4
P→T
F
P
RD
1) P→T: In pulse mode, execute P→T function.
2) P: Pause key.
3) F: Flash key
4) RD: Redial key
DIALING SIGNAL OPTION
A: Flash time
Row3
Row4
B:
Flash time(ms)
600
300
100
80
Row1
Row2
LNB
memory
MODE
TONE
TONE
PULSE
PULSE
PULSE
PULSE
PULSE RATE
--
--
20PPS
20PPS
10PPS
10PPS
M/B
--
--
40:60
33:66
40:60
33:66
NR
NR
R
R
NR
R
NR
R
R
R
NR
NR
UR
UR
NR
R
NR
R
NR
R
C: Tone function
Col1
Tone Duration
98ms
83ms
Inter-Tone Pause
98ms
83ms
NR
R
Note:
NR: no resistance
R: A resistance connect to V
SS
(820kΩ typically)
UR: A resistance connect to V
DD
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.03.07
Page 2 of 18
SC91710A/B
ABSOLUTE MAXIMUM RATING
(T
amb
=25°C, All voltage referenced to V
SS
, unless otherwise specified)
Characteristics
Power Supply Voltage
Input Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Symbol
V
DD
V
IN
P
D
T
opr
T
stg
Ratings
6.0
-0.3~V
DD
+0.3
500
-25~+70
-55~+150
Unit
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(T
amb
=25°C, V
DD
=2.5V, fosc=3.579545MHz, unless otherwise specified)
Characteristics
DC Characteristics
Tone
Operating Voltage
V
DD
Pulse
Memory retention
Operating Current
Standby Current
Memory Retention Current
Control Pin Input Low Voltage
Control Pin Input High Voltage
XMUTE
Pin Leakage Current
Symbol
Conditions
Min.
2.5
2.0
1.0
--
--
--
--
V
SS
0.7V
DD
--
0.2
--
4
200
--
--
0.5
0.5
0.1
0.5
--
--
--
--
Typ.
--
--
0.6
0.2
0.1
0.1
Max.
5.5
5.5
5.5
2
0.5
1
0.2
0.3V
DD
V
DD
Unit
V
I
OP
I
S
I
mr
V
il
V
ih
I
mth
I
mtl
I
hks
I
kbd
I
kbs
t
DB
R
hfi
I
hdoh
I
hdol
I
poh
I
pol
f
pr
t
M
t
B
Tone
Pulse
entry
OFF-HOOK,
Keypad entry
mA
µA
µA
V
µA
mA
µA
µA
ms
kΩ
mA
mA
µA
mA
pps
%
ms
ON-HOOK No keypad
ON-HOOK V
DD
=1.0V
--
--
V
XMUTE
=6.0V
V
XMUTE
=0.5V
V
hks
=2.5V
V
n
=0V note1
V
n
=2.5 note1
--
V
DD
=2.5
V
hfo
=2.0V
V
hfo
=2.5V
V
po
=2.5V
V
po
=0.5V
--
0.5
--
10
400
20
200
--
--
--
--
10
20
40:60
33:66
40
33
1
--
0.1
30
800
--
--
--
--
--
--
--
--
--
--
--
--
XMUTE
Pin Sink Current
HKS
Pin Input Current
Keyboard
Scanning Pin
Drive Current
Sink Current
Key-in Debounce Time
HFI pin input resistor
HFO pin drive current
HFO pin sink current
Pulse Mode
Pulse Output Pin Leakage Current
Pulse Output Pin Sink Current
Pulse Rate
Make/Break Ratio
Pre-digit Pause
t
PDP
M/B ratio=40:60
M/B ratio=33:66
--
--
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.03.07
Page 3 of 18
SC91710A/B
(Continued)
Characteristics
Inter-digit Pause
Tone Mode
DC Level
Tone
Sink Current
Load Resistor
DTMF
Signal
Pre-emphasis
Distortion(note 2)
Output Pin AC level
Symbol
t
IDP
Conditions
Pulse rate=10pps
Pulse rate=20pps
V
DD
=2.0V~5.5V
V
dtmf
=0.5V
Row group R
L
=10KΩ
Dist.≤ -23dB
V
DD
=2.0~5.5 V,
Column-Row group
R
L
=10KΩ
Auto redial
Auto redial
Min.
--
--
0.5V
DD
0.2
130
10
1
--
--
--
Typ.
800
500
--
--
155
--
2
-30
98/83
98/83
Max.
--
--
0.7V
DD
--
170
--
3
-23
--
--
Unit
ms
V
dc
I
tl
V
dtmf
R
I
twist
Dist.
t
TD
t
ITP
V
mA
mV
rms
KΩ
dB
dB
ms
ms
Minimum tone duration Time
Minimum Intertone Pause Time
Note: 1. Vn: Input voltage of any keyboard scanning pin (Row group, Column group)
2 Distortion (dB) = 20log{[V
12
+V
22
+V
32
+… Vn
2
)
1/2
]/[(V
L2
+V
H2
)
1/2
]}
V
L
,V
H
: Row group and Column group signal , V1 V2…
Vn: Harmonic signal (BW = 300Hz~3500Hz)
ACTUAL FREQUENCY OUTPUT
(f
osc
=3.579545MHz)
Keyboard Scanning Pin
R1
R2
R3
R4
C1
C2
C3
f1
f2
f3
f4
f5
f6
f7
Standard(Hz)
697
770
852
941
1209
1336
1477
Output
699
766
848
948
1216
1332
1472
Deviation(%)
+0.28
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
PIN CONFIGURATION
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.03.07
Page 4 of 18
SC91710A/B
PIN DESCRIPTION
Pin No.
SC91710A/AS
4
SC91710B
4
Pin Name
Description
* Provides keyboard scanning.
C1
HIGH”state and
*
HKS
pin is LOW, the column group stays in “
row group stays in “
LOW”state.
* The keypad is compatible with the standard dual contact matrix
1
1
C2
keyboard (as figure1b), the inexpensive single contact keyboard
(as figure 1a), and electronic input (as figure 1c).
* When
HKS
is “
LOW” a valid key entry is defined by related Row
,
& Column connection or by electronic input (as shown in figure
1c).
* Activation of two or more keys will result in no response, except
for single key.
* To avoid keyboard-bouncing error, this chip provides built-in
2
2
C3
3
3
C4
14
16
R1
debounce circuit. (The debounce time = 20ms)
Row
Column
Row
Column
Figure1a: Single contact form
keyboard configuration
Figure1b: Dual contact form
keyboard configuration
V
DD
V
SS
Column
V
DD
V
SS
Figure1c: Electronic signal input keyboard configuration
15
17
R2
16
18
R3
Row
13
15
R4
* Oscillator input & output pins.
5
5
OSCI
* 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
6
6
OSCO
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.
7
7
XMUTE
* The output is in “
LOW”state during dialing sequence (both Pulse
and Tone mode) otherwise this pin is “
high-impedance”
.
* Long (continue) Mute.
8
9
8
11
V
SS
V
DD
* Negative power supply pin.
* Positive power supply pin.
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.03.07
Page 5 of 18
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