MK53761 Datasheet, PDF (1/11 Pages) STMicroelectronics – REPERTORY DIALER

MK53761
. 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
DES CRI P TI O N
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.
July 1993
REPERTORY DIALER
DIP18
SO20
ORDERING NUMBERS :
MK53761N00
MK53761D
Figure 1 : Pin Connections.
V+
MODE
C1
C2
C3
V-
OSC1
OSC2
C4
1
18
2
17
3
16
4
15
5
14
6
13
7
12
8
11
9
10
D93TL017
DIP18
PULSE OUTPUT
HKS
R1
R2
R3
R4
MUTE OUTPUT
PACIFIER TONE/
CHIP DISABLE
DTMF OUTPUT
V+
MODE
C1
C2
C3
V-
OSC1
OSC2
C4
N.C.
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
D93TL018
SO20
PULSE OUTPUT
HKS
R1
R2
R3
R4
MUTE OUTPUT
PACIFIER TONE/
CHIP DISABLE
DTMF OUTPUT
N.C.
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