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
ORDERING INFORMATION
Device
SC91710A
Package
DIP-16-300-2.54
Mode (10PPS; 20PPS; Tone)
SC91710AS SOP-16-225-1.27
M/B ratio (40:60;33:66)
SC91710B
DIP-18-300-2.54
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
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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Page 1 of 18
SC91710A/B
LNB
memory
Kernel Control CKT.
BLOCK DIAGRAM
KEYBOARD ASSIGNMENT
C1
C2
C3
C4
R1
1
2
3
P→T
R2
4
5
6
F
R3
7
8
9
P
R4
*
0
#
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
B:
Row1
Row2
MODE
PULSE RATE
M/B
600
R
NR
TONE
--
--
R
300
R
R
TONE
--
--
R
NR
100
NR
NR
PULSE
20PPS
40:60
R
R
80
NR
R
PULSE
20PPS
33:66
UR
NR
PULSE
10PPS
40:60
UR
R
PULSE
10PPS
33:66
Row3
Row4
NR
NR
NR
Flash time(ms)
C: Tone function
Col1
Tone Duration
Inter-Tone Pause
NR
98ms
98ms
R
83ms
83ms
Note: NR: no resistance
R: A resistance connect to VSS (820kΩ typically)
UR: A resistance connect to VDD
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Page 2 of 18
SC91710A/B
ABSOLUTE MAXIMUM RATING(Tamb=25°C, All voltage referenced to VSS, unless otherwise specified)
Characteristics
Symbol
Ratings
Unit
Power Supply Voltage
VDD
6.0
V
Input Voltage
VIN
-0.3~VDD+0.3
V
Power Dissipation
PD
500
mW
Operating Temperature
Topr
-25~+70
°C
Storage Temperature
Tstg
-55~+150
°C
ELECTRICAL CHARACTERISTICS(Tamb=25°C, VDD=2.5V, fosc=3.579545MHz, unless otherwise specified)
Characteristics
Symbol
Conditions
Min.
Typ.
Max.
Tone
2.5
--
5.5
Pulse
2.0
--
5.5
Memory retention
1.0
Unit
DC Characteristics
Operating Voltage
Operating Current
VDD
IOP
V
5.5
Tone
OFF-HOOK,
--
0.6
2
Pulse
Keypad entry
--
0.2
0.5
--
0.1
1
µA
--
0.1
0.2
µA
ON-HOOK No keypad
mA
Standby Current
IS
Memory Retention Current
Imr
ON-HOOK VDD=1.0V
Control Pin Input Low Voltage
Vil
--
VSS
0.3VDD
Control Pin Input High Voltage
Vih
--
0.7VDD
VDD
XMUTE Pin Leakage Current
Imth
V XMUTE =6.0V
--
--
1
µA
XMUTE Pin Sink Current
Imtl
V XMUTE =0.5V
0.2
0.5
--
mA
HKS Pin Input Current
Ihks
Vhks=2.5V
--
--
0.1
µA
Keyboard
Drive Current
Ikbd
Vn=0V note1
4
10
30
Scanning Pin
Sink Current
Ikbs
Vn=2.5 note1
200
400
800
Key-in Debounce Time
tDB
--
--
20
--
ms
HFI pin input resistor
Rhfi
VDD=2.5
--
200
--
kΩ
HFO pin drive current
Ihdoh
Vhfo=2.0V
0.5
--
--
mA
HFO pin sink current
Ihdol
Vhfo=2.5V
0.5
--
--
mA
Pulse Output Pin Leakage Current
Ipoh
Vpo=2.5V
0.1
--
--
µA
Pulse Output Pin Sink Current
Ipol
Vpo=0.5V
0.5
--
--
mA
Pulse Rate
fpr
--
10
--
--
20
--
--
40:60
--
--
33:66
--
M/B ratio=40:60
--
40
--
M/B ratio=33:66
--
33
--
entry
V
µA
Pulse Mode
Make/Break Ratio
Pre-digit Pause
tM tB
tPDP
pps
%
ms
(To be continued)
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SC91710A/B
(Continued)
Characteristics
Inter-digit Pause
Symbol
tIDP
Conditions
Min.
Typ.
Max.
Unit
Pulse rate=10pps
--
800
--
Pulse rate=20pps
--
500
--
0.5VDD
--
0.7VDD
V
Vdtmf=0.5V
0.2
--
--
mA
Row group RL=10KΩ
130
155
170
mVrms
Dist.≤ -23dB
10
--
--
KΩ
1
2
3
dB
ms
Tone Mode
DC Level
Tone
Vdc
Sink Current
Output Pin AC level
DTMF
Signal
VDD=2.0V~5.5V
Itl
Vdtmf
Load Resistor
RI
Pre-emphasis
twist
Distortion(note 2)
VDD=2.0~5.5 V,
Column-Row group
Dist.
RL=10KΩ
--
-30
-23
dB
Minimum tone duration Time
tTD
Auto redial
--
98/83
--
ms
Minimum Intertone Pause Time
tITP
Auto redial
--
98/83
--
ms
Note: 1. Vn: Input voltage of any keyboard scanning pin (Row group, Column group)
2 Distortion (dB) = 20log{[V12+V22+V32+… Vn2)1/2]/[(VL2+VH2)1/2]}
VL,VH: Row group and Column group signal , V1 V2…
Vn: Harmonic signal (BW = 300Hz~3500Hz)
ACTUAL FREQUENCY OUTPUT (fosc=3.579545MHz)
Keyboard Scanning Pin
Standard(Hz)
Output
Deviation(%)
R1
f1
697
699
+0.28
R2
f2
770
766
-0.52
R3
f3
852
848
-0.47
R4
f4
941
948
+0.74
C1
f5
1209
1216
+0.57
C2
f6
1336
1332
-0.30
C3
f7
1477
1472
-0.34
PIN CONFIGURATION
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SC91710A/B
PIN DESCRIPTION
Pin No.
SC91710A/AS
SC91710B
4
4
Pin Name
Description
* Provides keyboard scanning.
C1
* HKS pin is LOW, the column group stays in “HIGH”state and
row group stays in “LOW”state.
* The keypad is compatible with the standard dual contact matrix
1
1
2
2
C2
C3
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).
3
3
C4
* 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
14
16
R1
debounce circuit. (The debounce time = 20ms)
Row
15
17
R2
Column
Figure1a: Single contact form
keyboard configuration
16
18
Row
Column
R3
Figure1b: Dual contact form
keyboard configuration
Row
VDD
VSS
Column
13
15
R4
VDD
VSS
Figure1c: Electronic signal input keyboard configuration
* 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
8
VSS
* Negative power supply pin.
9
11
VDD
* Positive power supply pin.
(To be continued)
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SC91710A/B
(Continued)
Pin No.
SC91710A SC91710B
Pin Name
Description
* Hook switch input pin.
* When the handset is in ON-HOOK state, this pin must be pulled
10
12
HKS
“high”in order to disable the dialing operation and decrease the
power consumption.
* When in OFF-HOOK state, the HKS pin must be pulled “low”state for
all function operation.
* Pulse output signal pin.
11
13
PO
* NMOS open drain output structure.
* The output is “LOW”during pulse dialing and Flash operation,
otherwise this output is “floating”.
* 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.
12
14
TONE
* The TONE pin provides minimum tone duration and minimum
intertone pause time to support rapid key-in. If key-in time is less than
100ms, DTMF signal will last for 100ms; otherwise the tone duration
will last as long as the key is pressed.
* Handfree input control pin.
* Toggle input structure, falling edge trigger.
9
HFI
* It is used to enable and disable Handfree function.
* With waveshaped by a built-in Schmit trigger, the bounce of input
can be eliminated by external R, C debounce circuit.
* A built-in pull down resistor is 200k typical.
* Handfree output control pin.
* Inverter output structure (normally ‘
low’
, active ‘
high’
).
* When a HFI pin is active, Handfree function will be enabled (HFO=1)
10
HFO
or disable (HFO=0).
* When the Handfree function is enable (HFO=1), after OFF-HOOK
action, it can reset Handfree function and HFO pin return to ‘
low’
state.
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SC91710A/B
KEYBOARD OPERATION
Symbol definitions:
a)
↑
:
OFF-HOOK or enable Hand Free function.
b)
↓
:
ON-HOOK or disable Hand Free function.
c)
:
Input level from low to high.
d)
:
Input level from high to low.
e)
D1~Dn
:
Digit key 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #, (C1~Cn is same as D1~Dn).
f)
Dp1~Dpn
:
Pulse digit 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, (Cp1~Cpn is same as Dp1~Dpn).
g)
Dt1~Dtn
:
Tone digit 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #, (Ct1~Ctn is same as Dt1~Dtn).
h)
tF
:
Flash time.
i)
tP
:
Pause time.
j)
tPT
:
Pulse to Tone wait time.
k)
tFP
:
Pause time for flash.
l)
tRP
:
Pause time for redial.
m)
LNB
:
Last number redial buffer.
A Normal Dialing
1. Digit Dialing
Procedure
:
↑ D1, D2… , Dn↓
Dial out
:
Dt1, Dt2… , Dtn (in Tone mode)
Dial out
:
Dp1, Dp2,… , Dpn (in Pulse mode)
LNB
:
D1, D2… , Dn
2. Dialing with flash key
:
↑ F, D1, D2… , Dn ↓
Dial out
:
tF, tFP, Dt1, Dt2… , Dtn (in Tone mode)
Dial out
:
tF, tFP, Dp1, Dp2, … , Dpn (in Pulse mode)
Procedure
LNB
D1, D2… , Dn
3. Dialing with P→T key
Procedure
:
↑ D1, D2 … , P→T , … , Dn ↓
Dial out
:
Dp1, Dp2, … , tPT, … , Dpn (in Pulse mode)
LNB
:
D1, D2 … , P→T , … , Dn
Note: If key in digit over maximum digit stored in LNB, then RD is inhibit even after on/off hook.
B Redial
LNB
:
D1, D2… , Dn
Procedure
:
↑ RD ↓
Dial out
:
tRP, Dt1, Dt2… , Dtn (in Tone mode)
Dial out
:
tRP, Dp1, Dp2,… , Dpn (in Pulse mode)
Note: If key in digit over maximum digit stored in LNB, then RD is inhibit.
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SC91710A/B
C Pause Function
Procedure
:
↑ D1, D2… , Dn, P, C1 … , Cn ↓
Dial out
:
Dt1, Dt2 ,… , Dtn, tP, Ct1, Ctn (in Tone mode)
Dial out
:
Dp1, Dp2, … Dpn , tP, Cp1 … , Cpn (in Pulse mode)
LNB
:
D1, D2… , Dn, P , C1, C2 … , Cn
Procedure
:
↑ D1, D2… , Dn, F, C1 … , Cn ↓
Dial out
:
Dt1, Dt2,… , Dtn , t F, tFP, Ct1 … , Ctn (in Tone mode)
Dial out
:
Dp1, Dp2,… , Dpn , tF, tFP, Cp1 … , Cpn (in Pulse mode)
LNB
:
C1, C2 … , Cn
D Flash Function
1. Reset
Handfree Function operation:
A) To execute Handfree function: When HFO = ’
low’
, HFI pin is active, the Handfree function will be enabled
(HFO = ’
high’
)
B) Reset Handfree function:
a. OFF-HOOK action.
b. When HFO = ’
high’
, a HFI pin is active again, the Handfree function will be reset (HFO=’
low’
).
Operating flow chart of Handfree
STATE NO.
PO
XMUTE
HFO
(0) INITIAL STATE
F
F
0
(1) ON HKS HF LINE
F
F
1
(2) OFF HKS LINE
F
F
0
(3) OFF HKS HF LINE
F
F
1
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* F: Floating (Hi-impedance)
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Page 8 of 18
SC91710A/B
TEST CIRCUIT
Note: 1. Dist. (dB)=20log{[V12+V22+V32+… Vn2)1/2]/[(VL2+VH2)1/2]}
a. V1… Vn are extraneous frequencies (ie, inter modulation and harmonic), components in the 500Hz to
3400Hz band.
b. VL,VH are the individual frequency components of DTMF signal.
c. Whether keyboard is pushed refer to the TONE mode time diagram.
2. Sink current Isink=I/(1-Duty Cycle), I is the net DC current measured from ampere meter.
3. R*, C* mean other column and row.
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SC91710A/B
TIMING DIAGRAMS
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SC91710A/B
TIMING DIAGRAMS(continued)
HKS
KEY IN
F
tDB
XMUTE
PO
tF
TONE
OSCO
......High impedance
Flash key operating timming
HKS
3
2
RD
KEY IN
tDB
XMUTE
PO
tITP
tITP
tITP
tITP
TONE
tD
OSCO
......High impedance
Tone Mode Redial Timming Diagram
HKS
3
2
RD
KEY IN
tDB
XMUTE
tRP
tIDP
tIDP
PO
tIDP
tIDP
TONE
OSCO
......High impedance
Pulse Mode Redial Timming Diagram
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SC91710A/B
TIMING DIAGRAMS(continued)
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SC91710A/B
TYPACAL APPLICATION CIRCUIT
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SC91710A/B
TYPACAL APPLICATION CIRCUIT
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SC91710A/B
CHIP TOPOGRAPHY
Size: 1.45 x 1.54 mm2
PAD COORDINATES (Unit: µm)
No.
Symbol
X
Y
No.
Symbol
X
Y
1
P1
-542.6
-238.0
10
P10
562.4
88.5
2
P2
-542.6
-468.1
11
P11
562.4
252.4
3
P3
-542.6
-602.5
12
P12
562.4
445.8
4
P4
-315.0
-602.5
13
P13
562.4
603.8
5
P5
-134.8
-602.5
14
P14
148.6
603.8
6
P6
85.5
-602.5
15
P15
-22.4
603.8
7
P7
562.4
-439.1
16
P16
-251.0
603.8
8
P8
562.4
-277.6
17
P17
-542.6
124.7
9
P9
562.4
-93.6
18
P18
-542.6
-102.9
Note: The original point of the coordinate is the die center.
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SC91710A/B
PACKAGE OUTLINE
DIP-16-300-2.54
UNIT: mm
SOP-16-225-1.27
UNIT: mm
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SC91710A/B
PACKAGE OUTLINE(Continued)
DIP-18-300-2.54
UNIT: mm
2.54
1.52
15 Degree
23.12±0.3
0.5MIN
0.46
1.27MAX
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against
electrostatic discharge but they can be damaged if the following precautions are not taken:
• Persons at a work bench should be earthed via a wrist strap.
• Equipment cases should be earthed.
• All tools used during assembly, including soldering tools and solder baths, must be earthed.
• MOS devices should be packed for dispatch in antistatic/conductive containers.
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Page 17 of 18