EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

GENERAL DESCRIPTION

The EM91710A/B are Tone/Pulse switchable dialer which are fabricated in CMOS 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.
· Uses 3.579545 MHz crystal or ceramic resonator.
· Many options can be selected.

Mode (10 PPS ; 20 PPS ; Tone)
M/B ratio (40 : 60 ; 33 : 66)
Pause time (3.6s)

· Flash function (RESET)

T pause time (3.6s)

Flash time (600ms; 300ms; 100ms; or 80ms).

· Mixed dialing.
· Handfree function is provided for speaker phone application.
· Power on reset circuit is provided.
· Package in DIP18 or DIP16.

PIN ASSIGNMENTS

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

C2
C3
C4
C1

OSCI

OSCO

XMUTE

16
15
14
13
12
11
10

1
2
3
4
5
6
7
8

EM91710A

R3
R2
R1
R4
TONE
PO
HKS
V

C2
C3
C4
C1

OSCI

OSCO

XMUTE

HFI

18
17
16
15
14
13
12
11
10

1
2
3
4
5
6
7
8
9

EM91710B

R3
R2
R1
R4
TONE
PO
HKS
V
HFO

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

KEYBOARD ASSIGNMENT

*or*/T

1). P

T : In pulse mode, execute P

T function.

2). F

: Flash key.

3). RD

: Redial key.

4). P

: Pause key.

5). */T

: In pulse mode, execte P

T function

In tone mode, execte "*" key.

FUNCTIONAL BLOCK DIAGRAM

DIALING SIGNAL OPTION :

(820K

typically)

Row3 Row4 flash time(ms)

600

300

100

a]:Flash time:

Note: NR:no resistance.

R : A resistance connect to Vss

UR: A resistance connect to V

MODE

PULSE RATE

M/B

TONE

PULSE

20PPS

40:60

PULSE

20PPS

33:66

PULSE

10PPS

40:60

PULSE

10PPS

33:66

Row1 Row2

b).

c]:Tone function:

Tone Duration

inter-Tone

Pause

98 ms

83 ms

98 ms

83 ms

Col1

*/T

Col2

*or*/T
select

d]:Key type select

ROW2

OSC.

COLUMN

INTERFACE CKT.

DIVIDER

KERNEL CONTROL CKT.

ROW/COLUMN

PROGRAMMING

COUNTER

ROW

INTERFACE CKT.

LNB MEMORY

DECODER &

DATA LATCH

PULSE

GENERATOR

D/A CONVERTER

INPUT INTERFACE CKT.

OUTPUT INTERFACE CKT.

COL1

COL2

COL3

COL4

OSCI

OSCO

ROW1

ROW3

ROW4

HKS

HFI

TONE

XMUTE

HFO

V DD

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

PIN DESCRIPTION

Symbol

Function

C1
C2
C3
C4

R1
R2
R3
R4

OSCI
OSCO

XMUTE

HKS

Figure 1a : Single contact form keyboard configuration

Row

Column

VSS

VDD

VSS

Figure 1b : Dual contact form keyboard configuration

Figure 1c : Electronic signal input keyboard configuration

Row

Column

Row

Column

Provides keyboard scanning .
a. Keyboard scanning:
HKS pin is LOW, the column group stays in "HIGH" stays and row group stays in "LOW" state.
The key pad is compatible with the standard dual contact matrix keyboard (as Figure 1b.), 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 show 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 = 20 ms.)

Oscillator input & Oscillator output pins.
The 3.579545 MHz oscillator is formed by a built-in inverter inside of this chip and by connecting a
3.579545 MHz crystal or a ceramic resonator across the OSCI and OSCO pins. (built-in 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.
The output is in "low" state during dialing sequence (both Pulse and Tone mode) otherwise this pin
is "high-impedance" .
Long (continue) Mute.
Negative power supply pin.
Positive power supply pin.
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 HKS pin must be pulled "low" state for 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".

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

Symbol

Function

TONE

HFI

HFO

Dual Tone Multi-frequency output pin.
In TONE mode, when a entry of digit key (include * , # key), this pin will sent out a corresponding
DTMF signal.
The TONE pin provides minimum tone duration (t

),& minimum intertone pause time to support rapid

key-in. If key-in time is less than t

, DTMF signal will last for t

, otherwise the tone duration will

last as long as the key is pressed.
Handfree input control pin.
Toggle input sturcture, 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 up resistor is 200K typical.
Handfree output pin.
Inverter output structure (normally "low", active "high").
When a HFI pin is active, Handfree function will be enabled (HFO=1) or disabled (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.

FUNCTION DESCRIPTION

Keyboard Operation

Symbol definitions:

a).

: OFF-HOOK or enable Hand Free function.

b).

: ON-HOOK or disable Hand Free function.

c). D

.....D

: Digit key; 1,2,3,4,5,6,7,8,9,0,*,# (C

.....C

is same as D

.....D

d). D

... D

: Pulse digit ; 1,2,3,4,5,6,7,8,9,0, (C

... C

is same as D

... D

e). D

....D

: Tone digit ; 1,2,3,4,5,6,7,8,9,0,*, # (C

....C

is same as D

....D

f). t

: Flash time.

g). t

: Pause time.

h). t

: Pulse to Tone wait time.

i). t

: Pause time for flash.

j). t

: Pause time for redial.

k). 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

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

2. Dialing with flash key

Procedure :

F,D1,D2 . . . . . ., Dn

Dial out

: t

, Dt1,Dt1 . . . . . . ., Dtn in tone mode

Dial out

: t

,Dp1,Dp1 . . . . . . ., Dpn in pulse mode

LNB

: D1, D2 . . . . . . . Dn

3. Dialing with P

T key

Procedure :

D1, D2 . . . . . .,P

T, . . . . . , Dn

Dial out

: Dp1, Dp2, . . . . t

, . . . . . , Dtn in pulse mode

LNB

: D1, D2 . . . . . ,P

T, . . . . Dn

Note : If key in digit over maximum digit stored in LNB, then RD is inhibited even after on/off hook.

B. Mixed dialing

Procedure :

D1, D2 . . . . . .,P

T, D9,D10, . . . . . , Dn

Dial out

: Dp1, Dp2, . . . . t

, Dt9,Dt10 . . . . . , Dtn

LNB

: D1, D2 . . . . . ,P

T, D9,D10 . . . . Dn

C. Redial

LNB

: D1, D2 . . . . . Dn

Procedure :

Dial out

: Dt1, Dt2, . . . . Dtn in tone mode

Dial out

: Dp1, Dp2, . . . . Dpn in pulse mode

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

D. 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

E. Flash Function

1. Reset
Procedure :

D1, D2, . . . .Dn, F, C1 . . . . .Cn

Dial out

: Dt1, Dt2, . . . . Dtn , t

,Ct1 . . . . . . . . . Ctn in tone mode

Dial out

: Dp1, Dp2, . . . . Dpn, t

,Cp1 . . . . . . . . .Cpn in pulse mode

LNB

: C1, C2 . . . . . Cn

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").

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

Operating flow chart of Handfree

* F : Floating (Hi-impedance)

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

STATE NO.

PO XMUTE

HFO

(0) INITIAL STATE

(1) ON HKS HF LINE

(2) OFF HKS LINE

(3) OFF HKS HF LINE

OFF HKS

LINE

OFF

ON HKS
HF LINE

OFF HKS

HF LINE

(2)

(3)

(1)

ON HKS
INITIAL (0)

OFF

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

TEST CIRCUIT

Operation current

Tone output voltage

Standby current

Tone distortion

(V1)**2+(V2)**2+..+(Vn)**2

DIST.(dB)= 20log

(VL)**2+(VH)**2

a. V1....Vn are extraneous frequencies (ie, inter modulation and

harmonic)
c o m p o n e n t s i n t h e 5 0 0 H z t o 3 4 0 0 H z b a n d .

b. VL,VH are the individual frequency components of the

DTMF signal

c. Whether keyboard is pushed refer to the TONE mode time

diagram

V+

HKS

V+

KEY

BOARD

MODE

HKS

DP
DP
DT

V+

HKS

TONE

10K

KEYBOARD
ENTRY

COUNTER
AND
AC METER

V+

10K

SPECTRUM
ANALYZER

KEYBOARD

ENTRY

HKS

TONE

HKS

Flash Key

VEXT

Pulse output sink current(
open drain structure)

MODE

R *

HKS

ROW

Keypad input

Isink=I/(1-Duty Cycle) I is the net DC current measured from
ampere meter.

HKS

MODE

Column

R* , C* mean others column and row.

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

ABSOLUTE MAXIMUM RATINGS

(Ambient Temperature is 25

C, All voltage referenced to V

. )

Parameter

Sym.

Ratings

Unit

Power Supply Voltage

6.0

Input Voltage Range

-0.3 ~ V

+ 0.3

Operating Temperature

OPR

0 ~ 50

°C

Storage Temperate

STO

-55 ~125

°C

Power Dissipation

500

ELECTRICAL CHARACTERISTICS

(I) (Ambient Temperature is 25

C, All voltage referenced to V

, V

= 2.5V,

unless otherwise noted

)

(General purpose specification, fosc. = 3.579545 MHz)

Parameter

Sym.

Conditions

Min.

Typ.

Max.

Unit

Tone

2.5

5.5

Pulse

2.0

5.5

Memory retension

1.0

5.5

Tone

0.6

Pulse

0.2

0.5

ON-HOOK, No Keypad entry

0.1

ON-HOOK, V

= 1.0V

0.1

0.2

0.3V

0.7V

Vxmute = 6.0V

Vxmute = 0.5V

0.2

0.5

Vhks = 2.5V

0.1

*Vn = 0V,

*Vn = 2.5V,

200

400

800

Vhfi=0

200

Vhfo = 2.0V

0.5

Vhfo = 0.5V

0.5

OFF-HOOK, Keypad entry

Operating Voltage

Operating Current

Iop

Standby Current

Memory retention current

Imr

Control pin input voltage

Vil

Vih

XMUTE pin

leakage current

Imth

sink current

Imtl

HKS pin input current

Ihks

Keyboard scanning pin

drive current

Ikbd

sink current

Ikbs

Key-in debounce time

HFI pin input resistor

Rhfi

HFO pin

drive current

Ihdoh

sink current

Ihdol

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

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

ELECTRICAL CHARACTERISTICS

(II) (Ambient Temperature is 25

C, All voltage referenced to V

, V

= 2.5V,

unless otherwise noted

)

(Pulse mode specification, fosc. = 3.579545 MHz)

Parameter

Sym.

Conditions

Min.

Typ.

Max.

Unit

Pulse output pin,SDO pin

leakage current

Ipoh

sink current

Ipol

Pulse rate

fpr

Make/Break ratio

TM:TB

Pre-digit Pause

PDP

Inter-digit Pause

IDP

Vpo = 2.5V

0.1

Vpo = 0.5V

0.5

pps

40:60

33:66

M/B ratio = 40:60

M/B ratio = 33:66

Pulse rate = 10pps

800

Pulse rate = 20pps

500

Parameter

Sym.

Conditions

Min.

Typ.

Max.

Unit

= 2.0V~5.5V

0.5V

0.7V

Vdtmf = 0.5V

0.2

Row group, RL = 10K

130

155

170

mVrms

Dist.

-23dB

= 2.0~5.5V, Column-Row group

RL = 10K

-30

-23

Auto redial

98/83

Auto redial

98/83

ELECTRICAL CHARACTERISTICS

(III) (Ambient Temperature is 25

C, All voltage referenced to V

, V

= 2.5V,

unless otherwise noted

)

(TONE mode specification, fosc. = 3.579545 MHz)

TONE output pin

DC level

Vdc

sink current

Itl

AC level

Vdtmf

Load resistor

DTMF signal:

pre-emphasis

twist

*distortion

Dist.

Minimum tone duration

Minimum intertone

ITP

pause

* Distortion (dB) = 20 log { [(V

+ V

+...+V

)

1/2

] / [(V

+ V

)

1/2

]}.

, V

: Row group and Column group signal.

,...., V

: Harmonic signal (BW = 300 Hz~ 3500 Hz).

* Actual frequency output (fosc. = 3.579545 MHz)

KEYBOARD SCANNING PIN

STANDARD (Hz)

OUTPUT (Hz)

DEVIATION (%)

697

699

+0.28

770

766

-0.52

852

848

-0.47

941

948

+0.74

1209

1216

+0.57

1336

1332

-0.30

1477

1472

-0.34

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

NORMAL DIALING

Figure 2: Tone Mode Timing Diagram

- - - - - - High impedance

Figure 3: Pulse Mode Timing Diagram

TONE

OSCO

HKS

KEY IN

XMUTE

ITP

- - - - - - High impedance

NORMAL DIALING

HKS

KEY IN

OSCO

XMUTE

TONE

IDP

PDP

IDP

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

Figure 5: Tone Mode Redial Timing Diagram

AUTO DIALING

- - - - - - High impedance

Figure 4: Timing Waveform for mixed dialing Operation (by P

T key entry)

- - - - - - High impedance

HKS

KEY IN

OSCO

TONE

ITP

XMUTE

HKS

KEY IN

P->T

XMUTE

TONE

OSCO

PDP

IDP

ITP

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

- - - - - - High impedance

Figure 6: Pulse Mode Redial Timing Diagram

Figure 7: Pause key operating timing

- - - - - - High impedance

KEY IN

XMUTE

HKS

TONE

OSCO

XMUTE

IDP

HKS

KEY IN

XMUTE

*PULSE MODE:

PDP

IDP

OSCO

IDP

TONE

OSCO

*TONE MODE:

XMUTE

TONE

ITP

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

APPLICATION CIRCUIT

OSCI

OSCO

HKS

TONE

2 WIRE TO 4 WIRE

SPEECH NETWORK

1µ

100K

TO HANDSEET

220K

100µ/16V

C945

470K

2K7

Z.D.

5V1

IN4148

100µ

16V

.1µ

IN4148

330K

100K

MPSA42

2K2

MPSA92

100K

OFF

240K

HOOK SW

22M

ZNR

120V

IN4004*4

Tip

Ring

R/P

820k*6

3.579545MHz

568

XMUTE

EM91710A

EM91710A Application Example

TONE

20PPS

10PPS

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

APPLICATION CIRCUIT

.02µ

200

C945

IN4148

EM91710B Application Example

2K2

IN4148

C945

3K3

ZNR

120V

HOOK ON

MPSA92

100K

22M

Ring

Tip

IN4004*4

0.1µF

47K

TONE

XMUTE

HKS

2 TO 4 WIRE

SPEECH NETWORK &

AUDIO AMPLIFIER

EM91710B

OSCO

OSCI

C4 C3 C2

HFI

HFO

TO HANDSET

100K

1µ

470K

100µ

16V

.1µ

5V1

C945

200K

.1µ

240K

820K*6

330K

100K

47K

HFO

KEY

3.579545 MHz

TONE

20PPS

10PPS

2K7

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

16 PDIP

MILIMETERS

INCHES

DIM

MIN.

MAX. MIN. MAX.

5.334

.210

0.381

.015

0.356

0.558

.014

.022

1.150

1.778

.045

.070

0.204

0.381

.008

.015

19.05

20.07

.750

.790

7.620

8.255

.300

.325

6.096

7.112

.240

.280

2.286

2.794

.090

.110

10.92

.430

2.921

4.064

.115

.160

Example :

91710 P

(1)

(2)

(3)

(1) ELAN MICRO. pefix
(2) Type number
(3) Package code:

PDIP

Skinny

SDIP

PACKAGE INFORMATION

16 Lead Plastic Package

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

18 PDIP

MILIMETERS

INCHES

DIM

MIN.

MAX. MIN. MAX.

5.334

.210

0.381

.015

0.356

0.558

.014

.022

1.150

1.778

.045

.070

0.204

0.381

.008

.015

22.35

23.37

.880

.920

7.620

8.255

.300

.325

6.096

7.112

.240

.280

2.286

2.794

.090

.110

10.92

.430

2.921

4.064

.115

.160

20 PDIP

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

5.334

.210

0.381

.015

0.356

0.558

.014

.022

1.150

1.778

.045

.070

0.204

0.381

.008

.015

25.40

26.67

1.000

1.050

7.620

8.255

.300

.325

6.096

7.112

.240

.280

2.286

2.794

.090

.110

10.92

.430

2.921

4.064

.115

.160

28 PDIP

MILIMETERS

INCHES

DIM

MIN.

MAX. MIN.

MAX.

6.350

.250

0.381

.015

0.356

0.558

.014

.022

1.016

1.778

.040

.070

0.204

0.381

.008

.015

35.56

37.85 1.400

1.490

15.24

15.88

.600

.625

13.21

14.73

.520

.580

2.286

2.794

.090

.110

17.78

.700

2.921

5.080

.115

.200

18/20/28 Lead Plastic Package

* This specification are subject to be changed without notice.

EM91710A/B

TONE/PULSE SWITCHABLE DIALER

9.30.1997

22/24 Lead Plastic Package-Skinny

22 PDIP (skinny)

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

4.752

.180

0.381

.015

0.356

0.558

.014

.022

1.27

1.778

.050

.070

0.204

3.556

.008

.014

25.90

26.67

1.02

1.05

7.620

8.255

.300

.325

6.223

6.604

.245

.260

2.286

2.794

.090

.110

8.382

10.16

.330

.400

2.921

4.064

.115

.160

24 PDIP (skinny)

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

4.572

.180

0.381

.015

0.356

0.558

.014

.022

1.27

1.778

.050

.070

0.204

0.381

.008

.015

31.24

32.26

1.23

1.270

7.620

8.255

.300

.325

6.223

6.731

.245

.265

2.286

2.794

.090

.110

8.636

9.652

.340

.380

2.921

4.064

.115

.160

EM91710A/B

TONE/PULES SWITCHABLE DIALER

* This specification are subject to be changed without notice.

9.30.1997

42 SDIP Package

A A2

42 SDIP

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

5.08

0.200

0.381

0.015

3.937

4.191

0.155

0.165

0.356

0.559

0.014

0.022

0.914

1.116

0.036

0.044

0.204

0.304

0.008

0.012

36.70

37.34

1.445

1.470

13.84

14.10

0.545

0.555

1.727

1.829

0.068

0.072

15.24

17.78

0.600

0.70

0.127

0.005

2.921

3.429

0.115

0.135

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