MK53761

July 1993

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

.

POWERED FROM TELEPHONE LINE, LOW

OPERATING VOLTAGE FOR LONG LOOP AP-

PLICATIONS

DESCRIPTION

The MK53761 is a Silicon Gate CMOS IC that pro-

vides necessary signals for either DTMF or loop dis-

connect (pulse) dialing. The MK53761 buffers up to

18 digits into memory that can be later redialed with

a single key input. Up to nine repertory numbers

may be stored. Users can store all 12 signaling keys

and access several unique functions with single key

entries. These functions include : Last Number Di-

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

the keypad configuration.

A LND key input automatically redials the last num-

ber dialed. The PROG key provides an easy way to

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

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

easy redialing of the number stored in memory lo-

cations (1-9).

The FLASH key simulates a 560 ms hook flash to

transfer calls or to activate other special features

provided by the PABX or a central office.

DIP18

SO20

Figure 1 : Pin Connections.

V+

MODE

C1

C2

C3

OSC1

V-

OSC2

C4

1

3

2

4

5

6

7

8

9

DTMF OUTPUT

PACIFIER TONE/

CHIP DISABLE

MUTE OUTPUT

R3

R4

R2

R1

HKS

PULSE OUTPUT

18

17

16

15

14

12

13

11

10

D93TL017

DIP18

ORDERING NUMBERS :

MK53761N00

MK53761D

V+

MODE

C1

C2

C3

OSC1

V-

OSC2

C4

DTMF OUTPUT

PACIFIER TONE/

CHIP DISABLE

MUTE OUTPUT

R3

R4

R2

R1

HKS

PULSE OUTPUT

1

3

2

4

5

6

7

8

9

18

17

16

15

14

12

13

11

19

10

20

N.C.

N.C.

D93TL018

SO20

1/11