MC14LC5447

5

DOR

Data Out Raw (Pin 14)

This pin presents the output of the demodulator whenever

CDO is low. This data stream includes the alternate 1 and 0

pattern, and the 150 ms of marking, which precedes the

data. At all other times, DOR is held high.

DOC

Data Out Cooked (Pin 15)

This output presents the output of the demodulator when-

ever CDO is low, and when an internal validation sequence

has been successfully passed. The output does not include

the alternate 1 and 0 pattern. At all other times, DOC is held

high.

VDD

Positive Power Supply (Pin 16)

The digital supply pin, which is connected to the positive

side of the power supply.

APPLICATIONS INFORMATION

The MC14LC5447 has been designed to be one of the

main functional blocks in products targeted for the CLASS

(Custom Local Area Signaling Service) market. CLASS is a

set of subscriber features now being presented to the con-

sumer by the RBOCs (Regional Bell Operating Companies)

and independent TELCOs. Among CLASS features, such as

distinctive ringing and selective call forwarding, the subscrib-

er will also have available a service known as Calling Num-

ber Delivery (CND) and message waiting. With these

services, a subscriber will have the ability to display at a mini-

mum, a message containing the phone number of the calling

party, the date, and the time. A message containing only this

information is known as a single format message, as shown

in Figure 9. An extended message, known as multiple format

message, can contain additional information as shown in

Figure 10.

The interface should be arranged to allow simplex data

transmission from the terminating central office, to the CPE

(Customer Premises Equipment), only when the CPE is in an

on–hook state. The data will be transmitted in the silent peri-

od between the first and second power ring after a voice path

has been established.

The data signaling interface should conform to Bell 202,

which is described as follows:

The transmission level from the terminating C.O. will be

– 13.5 dBm

± 1.0. The expected worst case attenuation

through the loop is expected to be – 20 dB. The receiver

therefore, should have a sensitivity of approximately

– 34.5 dBm to handle the worst case installations.

Additional information on CLASS services can be obtained

from:

BELLCORE CUSTOMER SVS.

1–800–521–2673

201–699–5800 FOREIGN CALLS

201–699–0936 FAX

The document number is: TA–NWT–000030

Title: “Voice Band Data Transmission Interface Generic

Requirements”

Figure 7 is a conceptual design of how the MC14LC5447

can be implemented into a product which will retrieve the in-

coming message and convert it to EIA–232 levels for trans-

mission to the serial port of a PC. With this message and

appropriate software, the PC can be used to look up the

name and any additional information associated with the call-

er that had been previously stored.

Figure 8 is a conceptual design of an adjunct unit in paral-

lel with an existing phone. This arrangement gives the sub-

scriber CND service without having to replace existing

equipment.

Table 1. Oscillator Specifications

Clock Select Pin 11 = 1

Crystal Mode

Parallel

Frequency

3.579 MHz or 3.6864 MHz

Rf

10 M

Ω

C1 and C2

30 pF

Source:

Fox Electronics

5570 Enterprise Pkwy.

Ft. Myers, FL 33905

Tel. 813–693–0099

Clock Select Pin 11 = 0

Resonator

#CSB455J

Frequency

455 kHz

± 0.5%

Rf

1.0 M

Ω

C1 and C2

100 pF

Source:

Murata Manufacturing Co. Ltd.

2200 Lake Park Dr.

Smyma, GA 30080

Tel. 404–436–1300

RF

OSCin

C1

C2

OSCout

NOTE: Motorola cannot recommend one supplier over another

and in no way suggests that this is a complete listing.

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