MK53761D [STMICROELECTRONICS]

REPERTORY DIALER; 储存拨号器


型号：	MK53761D
厂家：	ST
描述：	REPERTORY DIALER 储存拨号器晶体电信集成电路电信电路电话电路光电二极管
文件：	总11页 (文件大小：199K)
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MK53761

REPERTORY DIALER

SINGLE CHIP DTMF AND PULSE DIALER

SOFTSWITCH CHANGES SIGNALING MODE

FROM PULSE TO TONE

NINE NUMBER REPERTORY PLUS RECALL

OF LAST NUMBER DIALED (18 digits each)

FLASH KEY INPUT INITIATES TIMED HOOK

FLASH

8 TONE PER SECOND DIALING IN TONE

MODE AND 10 PPS IN PULSE MODE

DTMF ACTIVE UNTIL KEY RELEASE

MINIMUM DTMF DURATION/SEPARATION

GUARANTEED (74/54 ms)

PACIFIER TONE PROVIDES AUDIBLE INDI-

CATION OF VALID KEY INPUT FOR NON-

DTMF KEY ENTRIES

DIP18

SO20

ORDERING NUMBERS :

MK53761N00

MK53761D

Figure 1 : Pin Connections.

POWERED FROM TELEPHONE LINE, LOW

OPERATINGVOLTAGEFOR LONGLOOPAP-

PLICATIONS

V+

MODE

PULSE OUTPUT

HKS

V-

OSC1

OSC2

MUTE OUTPUT

PACIFIER TONE/

CHIP DISABLE

DTMF OUTPUT

DESCRIPTION

The MK53761 is a Silicon Gate CMOS IC that pro-

videsnecessarysignalsforeitherDTMF orloop dis-

connect(pulse) dialing. The MK53761 buffersup to

18 digits into memory that can be later redialedwith

a single key input. Up to nine repertory numbers

maybestored. Users can storeall12 signalingkeys

and accessseveral uniquefunctionswith singlekey

entries. These functions include : Last Number Di-

aled (LND), Softswitch, and Flash. Figure 2 shows

the keypad configuration.

A LND key inputautomaticallyredials the last num-

ber dialed. The PROG key provides an easy way to

program a number into any memory location (1-9)

whetheron-hook on off-hook.The MEM key allows

easy redialing of the number stored in memory lo-

cations (1-9).

D93TL017

DIP18

V+

PULSE OUTPUT

MODE

HKS

V-

OSC1

OSC2

MUTE OUTPUT

PACIFIER TONE/

CHIP DISABLE

DTMF OUTPUT

N.C.

D93TL018

The FLASH key simulates a 560 ms hook flash to

transfer calls or to activate other special features

provided by the PABX or a centraloffice.

SO20

1/11

July 1993

MK53761

Figure 2 : Keypad Configuration.

In thetone mode, if 2 or more keys in the same row

or if 2 or more keys in the same column are de-

pressed a single tone will be output. The tone will

corres-pond to the row or column for which the 2

keyswere pushed. This featureis for test purposes,

and single tones will not be redialed.

Alsoin the tonemode, the outputtoneis continuous

is manual dialing as long as the key is pushed. The

outputtone duration follows the table 1.

Table 1 : OutputTone Duration.

Key-Push Time, T*

T ≤ 32ms

Tone Output*

No Output Ignored by

MK53761

FUNCTIONAL PIN DESCRIPTION (DIP18 only)

32ms ≤ T ≤ 75ms + T_KD75ms Duration Output

T ≥ 75ms + T_KDOutput Duration = T – T_KD

V+

Pin 1. V+ is the positive supply for the circuit and

must meet the maximum and minimum voltage re-

quirements. (see electrical specifications).

TKD is the key pad debounce time which is typically 32 ms.

Whenredialingin thetonemode,eachDTMFoutput

is 75ms duration,and the tone separation (intersig-

nal delay) is 50ms.

MODE

Input.Pin 2. MODE determines the dialer’s default

operatingmode. When the device is powered up or

thehookswitchinputis switchedfromon-hook,(V+),

to off-hook,(V–), the default determines the signal-

ing mode. A V+ connection defaults to tone mode

operation and a V– connection defaults to pulse

mode operation.

When dialing in thepulsemode, asoftswitchfeature

will allow a changeto the tone mode whenever the

* key, orsoftswitch, is depressed.Subsequent* key

inputswill causetheDTMFcodeforan*tobedialed.

Thesoftswitchwillonlyswitchfrompulsetotone.Af-

ter returning to on-hook and back to off-hook, the

partwillbe inpulsemode.Redial bytheLND keywill

repeat the softswitch.

V–

Input. Pin 6 is the negativesupply input to the de-

vice. This is the voltage reference for all specifica-

tions.

OSC1, OSC2

Pin 7 (input), pin 8 (output). OSC1 and OSC2 are

connections to an on-chip inverter used as the tim-

ingreferenceforthecircuit. Ithassufficientloopgain

to oscillate when used with a low-cost television

color-burst crystal. Thenominal crystal frequencyis

3.579545MHz andanydeviationfrom this standard

is directly reflected in the Tone output frequencies.

Thecrystal oscillatorprovides thetime referencefor

all circuit functions.A ceramic resonatorwith toler-

ance of ± 0.25 % may also be used.

C1, C2, C3, C4, R4, R3, R2, R1

Keyboard inputs. The MK53761 interfaces with

either the standard2-of-8 with negativecommon or

the singlecontact(Form A) keyboard.

DTMF OUTPUT

Output.Pin 10. An NPNtransistoremitter with acol-

lector tied to V+drives the DTMF OUTPUT pin. The

transistor base is connected to an on-chip opera-

tional amplifier that mixes the Row and Column

tones. Figure 7 shows the timing at this pin.

The DTMF OUTPUT is the summation of a single

Row frequency and a single Column frequency. A

typical single tone sine wave is shown in Figure 4.

This waveform is synthesized using a resistor tree

with sinusoidally weighted taps.

The MK53761 is designed to operate from an un-

regulatedsupply ; the TONE LEVELis supply inde-

pendent,and thesingle row toneoutputlevelwill be

typically :

T_oi= –12 dBm ± 1 dB

TheDC componentof the DTMFoutputwhile active

is described by the following equation:

VDC₁= 0.3 V+ + 0.5 Volts

A valid keypad entry is either a single Row con-

nectedtoa singleColumn orV–simultaneouslypre-

sentedto both a single Row and Column. In its qui-

escent or standbystate, during normal off-hookop-

eration, either the Rows or the Columns are at a

logic level 1 (V+). Pulling one input low enablesthe

on-chip oscillator. Keyboard scanning then begins.

Scanningconsistsof RowsandColumnsalternately

switching high through on-chip pullups. Afterboth a

Row and Column key have been detected, the de-

bouncecounteris enabledandany noise(bouncing

contacts, etc.) is ignored for a debounce period

(TK_D) of32ms. At thistime, thekeyboardis sampled

and if both Row and Column information are valid,

the information is buffered into the LND location. If

switched on-hook(pin 17 to pin 1), the keyboard in-

puts all pull high through on-chip pullup resistors.

2/11

MK53761

Figure 3 : MK53761 Functional Block Diagram.

Figure 4 : Typical Single Tone.

Figure 5 : Typical Dual Tone.

3/11

MK53761

Figure 6 : Typical Spectral Response.

feed-back, confirming that the key has been prop-

erly entered and accepted. A 500 Hz square wave

isactivated uponacceptanceofa validkey input,af-

ter the 32 ms debouncetime. The square wave ter-

minatesaftera maximum of30 ms orwhen thevalid

key is no longer present. In pulse mode, all key en-

tries activate the pacifier tone. In tone mode, any

non-DTMF key (LND, FLASH, MEM, PROG) entry

activates the pacifier tone. When programming the

chip,all valid key entries activatethe pacifier tone in

either pulse or tone mode.

The CHIP DISABLE is an input. When pin 11 is

switched low througha resistor (10 K to 100 K), the

MK53761is enabled.Whenpin 11 isswitched toV+

through the resistor, all keypad inputs are pulled

high, and theMK53761will ignore all keypadinputs.

When the chip is disabled, it will notdial, and it can-

not be programmed. The chip can only be disabled

when the circuit is inactive (not dialing)and Pin 12

is switched high.

PACIFIER TONE OUTPUT/CHIP DISABLE

INPUT

Output. Pin 11. The pacifier tone provides audible

Table 2 : DTMFOutput Frequency.

Key Input

Standard Frequency

Actual Frequency

% Deviation

ROW

697

770

852

941

699.1

766.2

847.4

948.0

+ 0.31

– 0.49

– 0.54

+ 0.74

COL

1209

1336

1477

1215.9

1331.7

1471.9

+ 0.57

– 0.32

– 0.35

MUTE OUTPUT

naling and Figure 7 for tone mode signaling. MUTE

OUTPUT is active during each digit, and not active

during the interdigit time. In both tone and pulse

modes, MUTE OUTPUT goes active 40 ms before

PULSEOUTPUT for a FLASH. Figure 8 illustrates

the timing for this pin.

Output.Pin 12. This pin is the MUTE OUTPUT for

both tone and pulse modes. Timing is dependent

upon mode.

The MUTE OUTPUT consists of an open drain N-

channeldevice. During standby, the output is high

impedanceand generallyhas an externalpullup re-

sistor to the positive supply.

In the tone mode, MUTE OUTPUT is used to re-

move the transmitter and the receiver from the net-

work during DTMF signaling. During dialing, MUTE

OUTPUT is active continuouslyuntil dialingis com-

pleted.MUTE OUTPUT goes active when any key

is pushed.

HKS

Input.Pin 17. Pin 17 is the hookswitch input to the

MK53761.This is a high-impedanceinput and must

be switched high foron-hookoperationorlow foroff-

hookoperation.Atransition on this input causesthe

on-chip logic to initialize, terminating any operation

in progress atthe time.Thesignaling mode defaults

to the mode selected at pin 2.

In the pulse mode, MUTE OUTPUT is used to re-

movethereceiverandthenetworkfromthe line.Dif-

ferent circuitry is required for tone and pulsemuting

externaltotheICandapplicationsusingbothmodes

would not necessarily share circuitry. MUTE OUT-

PUT timing is shownin Figure 8 for pulsemode sig-

PULSEOUTPUT

Output. Pin 18. This is an output consisting of an

opendrain N-channel device.Ineitherpulse ortone

mode, the FLASH key will cause a 560 ms output

pulse at pin 18.

4/11

MK53761

Figure 7 : Tone Mode Timing.

Notes : 1. For this example, key entries are ≤ 75ms, but ≥ 32 ms.

2. MUTE goes active after any key is depressed.

Figure 8 : Pulse Mode Timing.

5/11

MK53761

DEVICE OPERATION

Flash consists of a timed Break of 560 ms. The

FLASH function is stored in memory, but it will not

be redialed assuch.Whena FLASHkey ispressed,

no furtherkey inputswill be accepteduntil thehook-

flash function(560 ms break) has beendialed. The

keyinput following a FLASH will be stored as thein-

itial digit of a new number (overwriting the number

dialed prior to the FLASH) unless it is another

FLASH.ConsecutiveFLASH entriesafteranumber

is dialedwill bestored sequentiallyin theLND mem-

oryandasubsequentLND entrywillcausetheredial

of that number with a delay, but not hookflash

breaks, at the end of the redialing sequence.When

redialing in tone mode, MUTE OUTPUT will remain

active during the flash delay period.

When the MK53761 is not actively dialing, it con-

sumes very little current. Row and Column inputs

assumeoppositestatesoff-hook.The circuitverifies

that a valid key has been entered by alternately

scanningthe Row and Column inputs. If the input is

still valid following 32 ms of debounce, the digit is

stored into memory, and dialing begins after a pre-

signal delay of approximately 40 ms (measured

from initial key closure). Output tone duration is

shown in Table 1.

The MK53761allows manualdialing of an indefinite

numberof digits,but ifmore than18 digits aredialed

per number, the 53761 will ”wrap around”. That is,

the extra digits beyond 18 will be stored at the be-

ginning of the LND buffer, and the first 18 digits will

no longer be available for redial. During autodial

fromLNDoranymemorylocation,key inputsarenot

accepted, but they will suspend dialing until re-

leased.

SOFTSWITCH

Whendialing inthe pulsemode, asoftswitchfeature

will allow a changeto the tone mode whenever the

* key is depressed. Subsequent * key inputs will

causetheDTMF codefor an* tobedialed. The soft-

switch will only switch from pulse to tone. After re-

turningtoon-hook andback to off-hook,thepart will

be in pulse mode. Redial by the LND key will repeat

the softswitch.

NORMAL DIALING (off-hook)

...ETC

PROGRAMMING AND REPERTORY DIALING

Programming is independent of HKS (pin 17) and

MODE (pin 2).

Normal dialing is straightforward, all keyboard en-

tries will be stored in the buffer and signaled in suc-

cession.

To program, enter the following :

PROG, Digit 1, Digit 2, ..., MEM, Location (1-9).

When programming, dialing in inhibited.

LAST NUMBER DIALED (LND)

Todail a numberfrom repertory memory(HKS must

be low) enter the following :

LND

MEM, Location (1-9).

To save the last number dialed : PROG, MEM, Lo-

cation (1-9).

Lastnumberdialingis accomplishedbyenteringthe

LND key.

HOOK FLASH

FLASH

...ETC

Hookflashmay beenteredinto thedialedsequence

at any point by keying in the function key, FLASH.

6/11

MK53761

Table 3 : Special Function Delays.

Each delay shown below represents the time required from after the special functionkey is depresseduntil

a new digit can be dialed.

The time is considered”FIRST” key is all previousinputshavebeencompleteddialed. The time is considered

”AUTO” if in redial, or previous dialing is still in progress.

Function

First/Auto

Pulse

Tone

SOFTSWITCH

FIRST

AUTO

0.40

1.10

ABSOLUTE MAXIMUM RATINGS*

Parameter

Value

Unit

DC Supply Voltage

6.5

Operating Temperature

– 20 to +60

– 55 to + 125

500

°C

Storage Temperature

Maximum Power Dissipation (25 °C)

Maximum Voltage on any Pin

(V⁺) + .3 ; (V^–) – .3

* All specifications are for 2.5 Volt operation and full operating temperature range unless otherwise stated.

ELECTRICAL CHARACTERISTICS (T_amb= 25°C unless otherwise specified)

DC CHARACTERISTICS

Symbol

Parameter

Min.

2.5

Typ.

Max.

6.0

Unit

Notes

V+

TONE

DC Operating Voltage

(tone mode)

V_MR

I_S

Memory Retention Voltage

Standby Current

1.5

1. 6

0.4

1.0

µA

I_MR

V_MUTE

I_T

Memory Retention Current

Mute Output Operating Voltage

Operating Current (tone)

Operating Current (pulse)

0.15

0.75

5. 6

1.8

300

150

600

250

µA

I_P

Operating Current On-hook Program Mode

Key Operated

No-key Operated

200

µA

I_ML

Mute Output (2.5 Volts)

Sink Current (4.0 Volts)

1.0

3.0

I_PL

I_PC

Pulse Output Sink Current

Pacifier Tone Sink/Source

Keypad Pullup Resistance

Keypad Pulldown Resistance

Keypad Input Level-low

1.0

2.0

500

100

500

µA

kΩ

Ω

250

K_RU

K_RD

V_IL

0.3 V

V_IH

Keypad Input Level-high

0.7 V

V +

V_PULSE

Operating Voltage (pulse mode)

1.8

6.0

Notes : 1. All inputs unloaded. Quiescent mode (oscillator off).

2. All outputs unloaded, singlekey input.

3. V_OUT=0.4 Volts.

4. Sink current for V_OUT= 0.5 Volts,Source Current for V_OUT= 2.0 Volts.

5. Memory Retention Voltage is the point where memory is guaranteed but circuit operation is not.

6. Propermemoryretention isguaranteed ifeitherthe minimumI_MRisprovidedor the minimumV_MR. Thedesign does not have to provide

both the minimum current or voltage simultaneously.

7. Minimum voltage where activation of mute output with key entry is ensured.

7/11

MK53761

ELECTRICAL CHARACTERISTICS (continued)

AC CHARACTERISTICS – TONE MODE

N°

Symbol

Parameter

Min.

Typ.

Max.

Unit

Notes

T_NK

Tone Output no Key Down

– 80

dBm

– 13

173

– 12

194

– 11

218

dBm

1, 2

T_Oi

PE_i

DC_i

Tone Output (independent)

Pre-emphasis, High Band

mV_rms

1.4

2.0

2.6

Tone Output DC Bias

V + = 2.5

V + = 3.5

1.25

1.5

R_E

T_RIS

DIS

Tone Output Load

1.0

5.0

8.0

kΩ

Tone Output Rise Time

Output Distortion

8.0

Tone Signaling Rate

Pre-signal Delay

1/sec

T_PSD

T_ISD

T_DUR

Inter-signal Delay (repertory)

Tone Output Duration (repertory)

Notes : 1. O dBm equals 1 mW power into 600 Ω or 775 mVolts.Important note : the MK53761 is designed to drive a 10 kΩ load. The 600 Ω

load is only for reference.

2. Single tone(low group), as measured at pin 10, T_A= 25°C.

3. Supply voltage = 2.5V; R_E= 10 kΩ. T_Oiincreases typically of 10mVrms with V_S= 6V.

4. Supply voltage = 2.5 volts.

5. Time frombeginning oftoneoutput waveform to 90 %offinal magnitude of eitherfrequency. Crystal parameters suggested forproper

operation areR_s< 100 Ω, L_m= 96 mH, C_m= 0.02 pF, C_h= 5 pF, f = 3.579545 MHz, and C_L= 18 pF.

6. Time from initial key input until beginnig of signaling.

AC CHARACTERISTICS – KEYPAD INPUTS, PACIFIER TONE

(numbers in left hand column refer to the timing diagrams.)

N°

Symbol

T_KD

Parameter

Keypad Debounce Time

Min.

Typ.

Max.

Unit

Notes

F_KS

Keypad Scan Frequency

Frequency Pacifier Tone

Pacifier Tone Duration

Hookflash Timing

250

500

F_PT

T_PT

T_HFP

560

Note : 1. Crystal oscillator accuracy directly affects these times

AC CHARACTERISTICS – PULSE MODE OPERATION

N°

Symbol

P_R

Parameter

Min.

Typ.

Max.

Unit

PPS

Notes

Pulse Rate

PDP

IDP

T_MO

T_B

Predigital Pause

Interdigital Pause

740

Mute Overlap Time

Break Time

T_M

Make Time

Notes : 1. 10 PPSis the nominal rate.

2. Figure 8 illustratesthis relationship.

8/11

MK53761

SO20 PACKAGE MECHANICAL DATA

inch

Typ.

DIM.

Min.

Typ.

Max.

2.65

0.2

Min.

Max.

0.104

0.008

0.096

0.019

0.013

0.1

0.004

2.45

0.49

0.32

0.35

0.23

0.014

0.009

0.5

0.020

45^o(typ.)

12.6

13.0

0.496

0.394

0.510

0.419

10.65

1.27

0.050

0.450

11.43

7.4

0.5

7.6

0.291

0.020

0.300

0.050

0.030

1.27

0.75

8^o(max.)

9/11

MK53761

DIP18 PACKAGE MECHANICAL DATA

inch

TYP.

DIM.

MIN.

0.254

1.39

TYP.

MAX.

MIN.

0.010

0.055

MAX.

1.65

0.064

0.46

0.25

0.018

0.010

23.24

0.914

8.5

0.335

0.100

0.800

2.54

20.32

7.1

0.280

0.155

3.93

3.3

0.130

0.050

1.27

1.59

0.062

10/11

MK53761

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for

the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its

use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica-

tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre-

viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or

systems without express written approval of SGS-THOMSON Microelectronics.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.

11/11

MK53761D [STMICROELECTRONICS]

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