KS58006 TONE/PULSE DIALER WITH REDIAL

INTRODUCTION

The KS58006 is DTMF/PULSE switchable dialer with a 32-digit redial which

can be done using a slide switch. All necessary dual-tone frequencies are
derived from a 3.579545 MHz TV crystal or ceramic resonator providing very
high accuracy and stability. The required sinusoidal wave form for each in-
dividual tone is digitally synthesized on the chip. The generated wave form
has very low total harmonic distortion (7% max). A voltage reference is
generated on the chip which is stable over the operating voltage and tem-
perature range and regulates the single levels of the dual tone to meet telephone
industry specifications. CMOS technology is applied to this device, for very
low power requirements high noise immunity, and easy interface to a variety
of telephones requiring external components.

FEATURES

Tone/Pulse switchable (slide switch)

32-digit capacity for redial

Automatic mix redialing ( last number dial ) of
PULSE

DTMF with multiple auto access pause

PABX auto-pause for 3.5 sec.

4 X 4 or ( 2 of 8 ) keyboard available

Two key single tone operation

Operating Voltage : 2.0 ~ 5.5V

Numbers dialed manually after redial are cascadable

and stored as additional numbers for next redialing

Uses inexpensive TV crystal or ceramic resonator

(3.579545MHz)

Make/Break ratio (33.3 / 66.6) pin selectable

Touch key hooking (604ms)

Low standby current

Improved EMI characteristic

Improved redial memory quality

PIN CONFIGURATION

Fig. 1

Device

Package

Operating Temperature

KS58006N

18-DIP-300A

- 20

C ~ + 70

KA58006

M/B

MDS

OSC IN

OSC OUT

TONE OUT

MUTE

18-DIP-300A

ORDERING INFORMATION

KS58006 TONE/PULSE DIALER WITH REDIAL

BLOCK DIAGRAM

Fig. 2

ARRANGEMENT OF KEYBOARD

TONE FREQUENCIES

C1 C2 C3 C4

* KEYBOARD DESCRIPTION

: HOOKING (604ms)

: PAUSE (3.5 second)

: REDIAL

KEYBOARD

LOGIC

RED IAL

MEMORY

32 DIGIT

INPUT LOGIC

CONTROL

LOGIC

OSC

DTMF

GENERATOR

OUPUT

LOGIC

R1
R2
R3
R4

MUTE

MDO

OSC IN

OSC OUT

TONE OUT

MUTE

KIT

M/B MDS OPERATION

Input

Specified

Actual

% Error

697

699.1

+ 0.31

770

766.2

- 0.49

852

847.4

- 0.54

941

948.0

+ 0.74

1209

1215.7

+ 0.57

1336

1331.7

- 0.32

1477

1471.9

- 0.35

KS58006 TONE/PULSE DIALER WITH REDIAL

PIN DESCRIPTION

Pin No

Symbol

Description

1- 4

15 -18

R1 - R4
C1 - C4

Keyboard (R1, R2, R3, R4, C1, C2, C3, C4)
These inputs can be interfaced to an XY matrix keyboard.
C1-C4 & R1-R4 are set to low at On Hook (HS = high). C1-C4 key inputs are set
to low and R1-R4 are set to high at OFF HOOK (HS = low) which enables the key-
input operation. The oscillator starts running when a keypress is detected. Scanning
signals are presented at both column and row inputs (TYP : 437Hz) until the
input key is released. Key inputs are compatible with standard 2-of-8 form or
single-contact keyboard. Debouncing is provided to avoid false entry (TYP : 4mS).

Hook Switch
This input detects the state of the hook switch contack. "Off Hook"
corresponds to V

condition. "On Hook" corresponds to V

condition.

M/B

Make/Break Ratio
This input provides the selection of the Make/Break ratio (33.3: 66.6/40:60)
when M/B is connected to V

Mode Select Input
Pulse/DTMF mode is selected as shown is the following table.
Initial Mode means the state after going Off Hook (HS

MDS

Pulse

MDS

Input = V

Tone

N/A

8 - 9

OSC IN

OSC OUT

Oscillator Input/Output
These pins are provided to connect an external 3.58MHz crystal. Oscillator
starts (at Off Hook) and is sustained unitl pulse or DTMF signals are finished.

10 - 11

, V

Power
These are the power supply inputs. The device is designed to be operated on
2.0V to 5.5V

TONE OUT

DTMF Signal Output
When a valid keypress is detected in DTMF mode, appropriate low and high
group frequencies are generated which hybrid the Dual Tone Output.
Tone out is Off State in pulse mode.
X'MUTE Output

X'MUTE Output

X'MUTE

"ON"

Normally "OFF"

"ON" during pulse and DTMF dialing

(N channel open drain)

Dial Pulse Out
DP : The normal output will be "ON" during break and "OFF" during make at
"OFF HOOK". The output will be "OFF" at "ON HOOK".

MDS

INITAL
MODE

SWITCHING
ENTRY MODE

KS58006 TONE/PULSE DIALER WITH REDIAL

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= 0V, V

= 3.5V, f

X'TAL

= 3.579545MHz, Ta = 25

C, unless otherwise noted)

Characteristic

Symbol

Value

Unit

Supply Voltage
Input Voltage
Output Voltage
Output Voltage
Tone Output Current
Power Dissipation
Operating Temperature
Storage Temperature

O (DXM)

O (TONE)

OPR

STG

6.0

- 0.3, V

+ 0.3

- 0.3, V

+ 0.3

(DP, X'MUTE, MUTE)

500

- 20 ~ + 70

- 40 ~ + 125

V
V
V
V

Characteristic

Symbol

Test Conditions

Min

Typ

Max

Unit

Operating Voltage Range

2.0

5.5

Memory Retention Voltage

1.0

Memory Retention Current

HS = V

= 1.0V

0.05

0.1

DD (PULSE)

MDS = V

0.1

0.3

DD (TONE)

MDS = V

0.4

0.7

OL1

DP,

= 3.5V

1.7

5.0

OL2

X'MUTE

= 2.5V

0.5

1.5

R1-R4, C1-C3, HS, M/B

0.8V

MDS

0.2V

= 3.5V, V

= 0V

= 2.5V, V

= 0V

Valid Key Entry Time

Key Release Time

Tone Duration

110

Tone Interdigit Pause Time

TIDP

110

Column and Row
Scanning Frequency

437

Auto Access Pause Time

3.5

sec

= 2.5V, R

= 5K

-14.0

-12.0

= 3.5V, R

= 5K

-14.0

-12.0

Ratio of Column to Row Tone

= 3.5V

1.0

2.0

3.0

Distortion

THD

= 3.5V

Tone Output Delay Time

D(TONE)

1.5

Operating Current

Standby Current

Output Current

Input Voltage

Input Current

Tone Output

O(TONE)

One key selected

HS=V

, All outputs

Unloaded

HS = V

No key selected.

All outputs

unloaded

= 0.4V

R1-R4

dBV

ROW TONE

ONLY

KS58006 TONE/PULSE DIALER WITH REDIAL

APPLICATION INFORMATION

KEYBOARD OPERATION

1. SINGLE MODE OPERATION

Pulse Mode Operation

. . .

The pulse mode is defined by the initial mode after going off Hook and latched at key entry. This is the condition
under MDS = V

Tone Mode Operation

. . .

The tone mode is defined by the initial mode after going off Hook and latched at key entry. This is the condition
under MDS = V

Manual Dialing with Automatic Access Pause

. . .

Multiple Pause key entries can be accepted and stored in the redial memory, each as a digit. Each key provides
3.5 seconds pause time, but the P key entry as the first digit after going Off Hook is ignored. The key can also
be used as a pause key in the pulse mode. Pause (2) can be cancelled with the or key during pause time
in redialing.
= Any numeric key.

Redialing

Up to 32 digits can be dialed with the key. The key is disabled while pulse or DTMF signals are transmitted.
When more than 32 digits are stored, redial is also inhibited.
The key can be used as the key in the pulse mode.

Inhibiting Redial

. . .

Redial can be inhibited by depressing the key twice after DTMF or pulse signals are transmitted.

Off Hook

KS58006 TONE/PULSE DIALER WITH REDIAL

2. PULSE/TONE SWITCHABLE OPERATION

Mode Switching by MDS Input

. . . . . .

Pulse Mode DTMF Mode

The pulse mode is initially defined MDS = V

, mode switching to the DTMF mode can be accepted by MDS = V

the DTMF mode will be set up after the pulse mode is finished. In this mode, digits Dn + 1 ... Dn + m are transmitted
from Tone Out as DTMF signals by depressing the corresponding keys.
If no P key is contained serially before or after mode switching, the following condition is obtained.

. . . . . .

Pulse Mode DTMF Mode

(Dn+1

Pause)

If digit is depressed after the pulse mode is finished, the DTMF mode will be set up after last the pulse signal
( ) is generated. In this mode,digits ... are transmitted from Tone Out as DTMF signals by depress-
ing the corresponding keys. If digit is depressed during dialing pulse signals. What happens? When the DTMF
mode is set, the Hold State will be set after last pulse signal Dn is finished. MDO

will flash to indicate this Hold

State, ... are stored in redial memory as DTMF DATA and not transmitted from Tone Out. When it is
ready to transmit DTMF data in redial memory, the or key is depressed to reset this Hold State and
... data are serially transmitted.

Off Hook

Switching MDS to V

Dn+1

DN+m

Off Hook

Switching MDS to V

Dn+1

Dn+m

Dn+1

Dn+m

Dn+

Dn+1

Dn+m

Dn+1

Dn+m

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