Datasheet SC91710A, SC91710B Datasheet (SILAN)

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Semiconductors

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TONE / PULSE SWITCHABLE DIALER
WITH 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)

PIN CONFIGURATION

SC91710A/B

DIP-16

DIP-18

*Mixed dialing
*Power on reset circuit is provided
*Handfree function is provided for speaker

phone application

*Packaged in 16-DIP or 18-DIP

ORDERING INFORMATION

SC91710A
SC91710B

DIP-16 Packaged
DIP-18 Packaged

OSCI

OSCO

XMUTE

V

1

OSCI

OSCO

XMUTE

V

HFI

C2

2

C3

3

C4

4

C1

5
6
7

SS

8
9

1

C2

2

C3

3

C4

4

C1

5
6
7
8

SS

16
15
14
13
12

SC91710A

11
10

R3

R2

R1

R4

TONE

PO

HKS

9

V

DD

18
17
16
15
14

SC91710B

13
12
11
10

R3

R2

R1

R4

TONE

PO

HKS

V

DD

HFO

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BLOCK DIAGRAM



XMUTE

HFO

SC91710A/B

VDD

COL1

COL2

COL3

COL4

OSCI

OSCO

ROW1

ROW2

ROW3

ROW4

OSC. DIVIDER

KEYBOARD ASSIGNMENT

C1 C2 C3 C4
R1
R2
R3
R4

123P→T
456F
789P

*or */T 0 # RD

COLUMN

ROW

INPUT INTERFACE CKT.

INTERFACECKT.

LNB MEMORY

KERNEL CONTROL CKT.

INTERFACECKT.

INPUT INTERFACE CKT.

HFI

HKS

PULSE

GENERATOR

DECODER &
DATA LATCH

ROW/COLUMN

PROGRAMMING

COUNTER

D/A CONVERTER

VSS

PO

TONE

1) P→T: In pulse mode, execute P→T function.

2) P: Pause key.

3) F: Flash key

4) RD: Redial key

5) In pulse mode, execute P→T function.
In tone mode, execte “

*

”key

DIALING SIGNAL OPTION

A: Flash time B:

Row3 Row4

Flash time(ms)

Row1 Row2

MODE PULSERATE M/B

NR NR 600 R NR TONE -- -­NR 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

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C: Tonefunction D: Key type select

Col1

NR 98ms 98ms NR *

Note: NR: no resistance

Tone Duration Inter-Tone Pause

R 83ms 83ms R */T

R: A resistance connect to V
UR: A resistance connect to V



(820kΩ typically)

SS
DD

Col2

ABSOLUTE MAXIMUM RATINGS

(Tamb=25°C, All voltage referenced to VSS, unless otherwise specified)

Characteristic Symbol Value Unit

Power Supply Voltage V
Input Voltage V
PowerDissipation P
Operating Temperature Topr -25~+70 °C
Storage Temperature Tstg -55~+150 °C

DD

IN

D

ELECTRICAL CHARACTERISTICS

(Tamb=25°C, VDD=2.5V,fosc=3.579545MHz, unless otherwise specified)

Parameter Symbol Conditions Min Typ Max Unit

DC Characteristics

Operating Voltage V

Operating Current I

Standby Current ISON-HOOKNo keypad entry -- 0.1 1 µA
Memory Retention Current Imr ON-HOOKVDD=1.0V -- 0.1 0.2 µA
Control Pin Input Low Voltage Vil -- V
Control Pin Input High Voltage Vih -- 0.7V

Pin Leakage Current

XMUTE

XMUTE

HKS

Scanning Pin
Key-in Debounce Time t

Pin Sink Current

Pin Input Current Ihks Vhks=2.5V -- -- 0.1 µA

Tone 2.5 -- 5.5

DD

Pulse 2.0 -- 5.5
Memory retention 1.0 5.5
Tone -- 0.6 2

OP

Pulse

V

Imth

V

Imtl

Drive Current Ikbd Vn=0Vnote1 41030Keyboard
Sink Current Ikbs Vn=2.5note1 200 400 800

-- -- 20 -- ms

DB

XMUTE

XMUTE

OFF-HOOK,
Keypad entry

=6.0V
=0.5V

SC91710A/B

*or */T select

6.0 V

-0.3~VDD+0.3 V
500 mW

-- 0.2 0.5

SS

DD

-- -- 1 µA

0.2 0.5 -- mA

0.3V
V

(to be continued)

mA

DD

DD

µA

V

V

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(continued)

Parameter Symbol Conditions Min Typ Max Unit

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 Mode

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

Make/Break Ratio tMt

Pre-digit Pause t

Inter-digit Pause t

B

M/B ratio=40:60 -- 40 --

PDP

M/B ratio=33:66 -- 33 -­Pulse rate=10pps -- 800 --

IDP

Pulse rate=20pps -- 500 --

Tone Mode

DC Level Vdc VDD=2.0V~5.5V 0.5V
Tone
Output Pin

Sink Current Itl Vdtmf=0.5V 0.2 -- -- mA

AC level Vdtmf RowgroupRL=10KΩ 130 155 170 mVrms

Load Resistor RI Dist.≤ -23dB 10 -- -- KΩ

=2.0~5.5 V,

V

DTMF Signal

Pre-emphasis twist

Distortion(note 2) Dist. R
Minimum tone duration Time t
Minimum Intertone Pause Time t

DD

Column-Row group

=10KΩ -- -30 -23 dB

L

Auto redial -- 98/83 -- ms

TD

Auto redial -- 98/83 -- ms

ITP

Note: 1. Vn: Input voltage of any keyboard scanning pin (Row group, Column group)

2

2

2Distortion (dB) = 20log{[V

: Row group and Column group signal , V1V2…Vn: Harmonic signal (BW = 300Hz~3500Hz

V

L,VH

1

+V

2

+V

+…Vn2)

2

3

2

1/2

]/[(V

2

1/2

+V

)

L

]}

H

SC91710A/B

-- 10 --

-- 20 --

-- 40:60 --

-- 33:66 --

DD

-- 0.7V

123dB

DD

pps

%

ms

ms

V

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

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PIN DESCRIPTION

Pin No.

SC91710A SC91710B



SC91710A/B

Pin Name Description

44

11

22

33

14 16

15 17

16 18

13 15

C1

C2

C3

C4

R1

R2

R3

R4

*Provides keyboard scanning.
*

pin is LOW, the column group stays in “HIGH” state and row group

HKS

stays in “LOW” state.

*The keypad is compatible with the standard dual contact matrix keyboard

(as figure1b), the inexpensive single contact keyboard (as figure 1a), and

electronic input (as figure 1c).

*When

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 debounce

circuit. (The debounce time = 20ms)

Figure1a: Single contact form

is “LOW”, a valid key entry is defined by related Row &

HKS

Row

keyboard configuration

Row

Column

Figure1c: Electronic signal input keyboard configuration

Column

Figure1b: Dual contact form

Row

Column

keyboard configuration

V

DD

V

SS

V

DD

V

SS

*Oscillator input & output pins.

55OSCI

66OSCO

*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)
*When
generates a 3.579545 MHz clock.

is “LOW”, a valid key-in may turn on this oscillator and

HKS

(to be continued)

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( continued )

Pin No.

SC91710

SC91710B

A

7

8 8 VSS *Negative power supply pin.
9 11 VDD *Positive power supply pin.

10 12

11 13

12 14 TONE

Pin Name Description

7

XMUTE

HKS

9

10 HFO

PO

HFI



*Mute output pins.
*NMOS open drain output structure.
*The output is in “LOW” state during dialing sequence (both Pulse and
Tone

mode) otherwise this pin is “high-impedance”.

*Long (continue) Mute.

*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.
*When in OFF-HOOK state, the
all function operation.
*Pulse output signal pin.
*NMOS open drain output structure.
*The output is “LOW” during pulse dialing and Flash operation, otherwise

this output is “floating”.
*Dual ToneMulti-frequency output pin.
*In TONE mode, when an entry of digit key (include *, # key), this pin will

send out a corresponding DTMF signal.
*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.
* Toggleinput structure, falling edge trigger.
* 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) 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.

SC91710A/B

pin must be pulled “low” state for

HKS

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KEYBOARD OPERATION

Symbol definitions:

↑

a)

↓

b)
c)

d)
e) D1~Dn :

f) Dp1~Dpn :
g) Dt1~Dtn :
h) t

F

i) t

P

j) t

PT

k) t

FP

l) t

RP

m) LNB : Last number redial buffer.

ANormal Dialing

1. Digit Dialing

: OFF-HOOK or enable Hand Free function.
: ON-HOOK or disable Hand Free function.
:

Input level from low to high.

:

Input level from high to low.
Digit key1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #, (C1~Cn is same as D1~Dn).
Pulse digit1, 2, 3, 4, 5, 6, 7, 8, 9, 0, (Cp1~Cpn is same as Dp1~Dpn).

Tone digit1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #, (Ct1~Ctn is same as Dt1~Dtn).
:Flashtime.
: Pause time.
: Pulse to Tone wait time.
: Pause time for flash.
: Pause time for redial.



SC91710A/B

Procedure  ↑ D1, D2…, Dn↓
Dial out  Dt1, Dt2…, Dtn (in Tonemode)
Dial out  Dp1, Dp2,…, Dpn (in Pulse mode)
LNB  D1, D2…, Dn

2. Dialing with flash key

Procedure  ↑ F,D1,D2…,Dn ↓
Dial out  t
Dial out  t
LNB  D1,D2…,Dn

, Dt1, Dt2…, Dtn (in Tone mode)

F,tFP

, Dp1, Dp2, …, Dpn (in Pulse mode)

F,tFP

3. Dialing with P→Tkey

Procedure  ↑ D1,D2…,P→T,…, Dn ↓
Dial out  Dp1, Dp2, …, t
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.

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, …, Dpn (in Pulse mode)

PT

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BMixed dialing

Procedure  ↑D1, D2…, P→T , D9, D10 …, Dn↓
Dial out  Dp1, Dp2, …, t
LNB  D1, D2…, P→T , D9, D10 …, Dn

CRedial

LNB  D1,D2…,Dn
Procedure  ↑ RD ↓
Dial out  t
Dial out  t

Note: If key in digit over maximum digit stored in LNB, then RD is inhibit.

DPause Function

Procedure  ↑ D1, D2…, Dn, P, C1 …, Cn ↓
Dial out  Dt1, Dt2 ,…, Dtn, t
Dial out  Dp1, Dp2, … Dpn , t
LNB  D1,D2…,Dn,P,C1,C2…,Cn



,Dt9,Dt10…,Dtn

PT

, Dt1, Dt2…, Dtn (in Tone mode)

RP

, Dp1, Dp2,…, Dpn (in Pulse mode)

RP

, Ct1, Ctn (in Tone mode)

P

, Cp1 …, Cpn (in Pulse mode)

P

SC91710A/B

EFlash Function

1. Reset

Procedure  ↑ D1, D2…, Dn, F, C1 …, Cn ↓
Dial out  Dt1, Dt2,…, Dtn , t
Dial out  Dp1, Dp2,…, Dpn , t
LNB  C1,C2…,Cn

, Ct1 …, Ctn (in Tone mode)

F,tFP

, Cp1 …, Cpn (in Pulse mode)

F,tFP

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’).

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Operating flow chart of Handfree

HF

ON HKS
HF LINE

Note: ON: ON HKS; OFF: OFF HKS; HF: Pressed HF key

STATENO.
(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



ON HKS

(0)

INITIAL

HF

(1)

OFF

ON

OFF HKS

HF LINE

PO XMUTE

OFF

HF

(3)

SC91710A/B

ON

OFF HKS

HF

LINE

HFO

(2)

* F: Floating

(Hi-impedance)

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TEST CIRCUIT



Operation

1 2

current

V+

A

Standby

current

SC91710A/B

V+

A

DD

V

ROW

HKS V

V+

V

DD

SS

HKSV

HKS V

MODE

SS

TONE

HKSV

PO

V

V+

V

DD

SS

MODE

keyboard

3

Tone output voltage

keyboard

5 6

Pulse output sink current

(open drain structure)

V+

V

Flash

key

7

DD

SS

Keypad input current (row group)

A

A

VEXT

R*

C*

counter

and

AC meter

10KΩ

DP
DP
DT

HKSV

DD

V

SS

4

Tone distortion

keyboard

V+

HKSV

TONE

Spectrum

analyzer

V

V

DD

SS

Pulse output sink current
(inverter structure)

V+

V

DD

HKS

PO

MODE

A

V

VEXT

R*

C*

V

SS

8

keypad input current (column group)

A

COLUMN

HKS V

V+

V

DD

SS

10KΩ

2

2

2

2

2

Note: 1. Dist. (dB)=20log{[V

+V

+V

1

2

3

+…V

1/2

)

]/[(V

n

2

1/2

+V

)

L

]}

H

a. V1…Vn are extraneous frequencies (ie, inter modulation and harmonic), components in the 500Hz

to

3400Hz band.

b. V

are the individual frequency components of DTMF signal.

L,VH

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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TIMING DIAGRAMS

HKS



SC91710A/B

KEY IN

XMUTE

PO

TONE

OSCO

HKS

KEY IN

XMUTE

PO

TONE

OSCO

3 2 3

t

DB

t

TDtITP

t

ITP

Normal dialing

Tone Mode Timming Diagram

3 2 3

t

DB

t

t

B

PDP

t

TDtIDP

t

M

t

IDP

Normal dialing

t

ITP

......High impedance

t

IDP

......High impedance

Pusle Mode Timming Diagram

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TIMING DIAGRAMS

HKS

(continued)



SC91710A/B

KEY IN

XMUTE

PO

TONE

OSCO

KEY IN

XMUTE

TONE

HKS

PO

t

IDP

P→T

t

PT

3 2 3

t

DB

t

PDP

t

IDP

Timming Waveform for mixed dialing Operation

(by P→T key entry)

F

t

DB

t

F

t

ITP

......High impedance

OSCO

......High impedance

Flash key operating timming

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TIMING DIAGRAMS

HKS

(continued)



SC91710A/B

KEY IN

XMUTE

PO

TONE

OSCO

HKS

KEY IN

XMUTE

PO

TONE

3

t

DB

t

ITP

Tone Mode Redial Timming Diagram

3

t

DB

t

IDP

2

t

ITP

2

t

IDP

RD

t

RP

RD

t

ITP

t

D

......High impedance

t

IDP

t

IDP

t

ITP

OSCO

......High impedance

Pulse Mode Redial Timming Diagram

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TIMING DIAGRAMS

HKS

(continued)



SC91710A/B

KEY IN

*PULSE MODE

XMUTE

3 3

2

t

DB

t

PDP

t

IDP

P

t

t

IDP

t

P

IDP

PO

TONE

OSCO

*TONE MODE

t

DB

XMUTE

PO

t

t

ITP

ITP

t

P

t

ITP

TONE

OSCO

......High impendance

Pause key operating timming

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TYPACAL APPLICATION CIRCUIT

820kΩx5



*

0

#
R/P

SC91710A/B

1

4

7

2

5

8

3

6

9

P

P→T

F

Ring

Tip

1N4004x4

TONE

20pps

10pps

120V

ZNR

MPSA42

14

15

16

13

R1

R2

R3

R4

C4 C3 C2 C1

3 2 1 4 8

VDD

PO

11 9 10

100kΩ

1µF

2.2kΩ

330kΩ

240kΩ

1N4148

HOOK

MPSA92

ON/OFF

100kΩ22MΩ

SC91710A

100µF

V

3.579545MHz

OSCI OSCO

5 6

DD

470kΩ

HKS

V

XMUTE

SS

TO HANDSET

TONE

12

7

Speech network

2wrieto4wire

16V

1N4148x2

5.1V

2kΩ

100µF

16V

C945

1µF

100kΩ

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TYPACAL APPLICATION CIRCUIT

820kΩx6



SC91710A/B

1

4

7

*

2

5

8

0

3

6

9

#
R/P

P

P→T

F

120V

Ring

ZNR

Tip

1N4004x4

20pps

10pps

TONE

14

15

16

13

3 2 1 4 8

VDD

SC91710B

OSCI OSCO

3.579545MHz

5 6

KEY

V

SS

HFI

9

1µF

HF

TO HANDSET

XMUTE

7

PO

HKS

HFO

10

& Audio amplifier

Speech network

2wrieto4wire

R1

R2

R3

R4

C4 C3 C2 C1

47kΩ

13 12 11

47kΩ

100µF

16V

V

DD

TONE

14

0.2µF

100kΩ

1µF

200kΩ

1µF

5.1V

3.3kΩ

240kΩ

C954

330kΩ

200kΩ

C945

470kΩ

2.7kΩ

C954

HOOK ON/OFF

MPSA92

22MΩ

100kΩ

1N4148

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.0 2001-11-13

16

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Silan
Semiconductors



CHIP TOPOGRAPHY



SC91710A/B

Size: 1.45 x 1.54 mm

2

PAD COORDINATES

No. Symbol X Y No. Symbol X Y

1
2
3
4
5
6
7
8
9

Note: The original point of the coordinate is the die center.

P1 -542.6 -238.0
P2 -542.6 -468.1
P3 -542.6 -602.5
P4 -315.0 -602.5
P5 -134.8 -602.5
P6 85.5 -602.5
P7 562.4 -439.1
P8 562.4 -277.6
P9 562.4 -93.6

(Unit: µm)

10
11
12
13 P13
14 P14 148.6
15 P15
16 P16
17 P17
18 P18

P10 562.4 88.5
P11 562.4 252.4
P12 562.4 445.8

562.4 603.8

-22.4

-251.0 603.8

-542.6 124.7

-542.6 -102.9

603.8

603.8

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.0 2001-11-13

17

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

Silan
Semiconductors





PACKAGE OUTLINE

DIP-16-300-2.54 UNIT: mm

2.54

SC91710A/B

0.25

6.40

19.4

3.51

0.46

1.50

7.62

15 degree

5.083.30

DIP-18-300-2.54 UNIT: mm

2.54

0.25

6.40

1.50

22.95

7.62

15 degree

3.51

0.46

5.083.30

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.0 2001-11-13

18

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