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MC14LC5447 Datasheet(PDF) 4 Page - Motorola, Inc

Part No. MC14LC5447
Description  Calling Line Identification (CLID) Receiver with Ring Detector
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MC14LC5447 Datasheet(HTML) 4 Page - Motorola, Inc

 
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MC14LC5447
MOTOROLA
4
12 RDO
13 CDO
14 DOR
3.579 MHz
15 DOC
11 CLKSIN
10 OSCin
9 OSCout
PWRUP 7
RT 6
NC 5
RDI1 3
RI 2
TI 1
30
pF
RDI2 4
OPEN
VDD
0.1
µF
30
pF
10 M
16
8
RT
PWRUP
IDD
OSCin
11
1
µA MAX DISABLE
0
1
2.4 mA TYP ENABLE
X
0
6.2 mA TYP ENABLE
VDD
Figure 1. IDD Test Circuit
PIN DESCRIPTIONS
TI
Tip Input (Pin 1)
This input pin is normally connected to the tip side of the
twisted pair. It is internally biased to 1/2 supply voltage when
the device is in the power–up mode. This pin must be dc iso-
lated from the line.
RI
Ring Input (Pin 2)
This input is normally connected to the ring side of the
twisted pair. It is internally biased to 1/2 supply voltage when
the device is in the power–up mode. This pin must be dc iso-
lated from the line.
RDI1
Ring Detect Input 1 (Pin 3)
This input is normally coupled to one of the twisted pair
wires through an attenuating network. It detects energy on
the line and enables the oscillator and precision ring detec-
tion circuitry.
RDI2
Ring Detect Input 2 (Pin 4)
This input to the precision ring detection circuit is normally
coupled to one of the twisted pair wires through an atte-
nuating network. A valid ring signal as determined from this
input sends the RDO (Pin 12) to a logic 0.
RT
Ring Time (Pin 6)
An RC network may be connected to this pin. The RC time
constant is chosen to hold this pin voltage below 2.2 V be-
tween the peaks of the ringing signal. RT is an internal
power–up control and activates only the circuitry necessary
to determine if the incoming ring is valid.
PWRUP
Power Up (Pin 7)
A logic 0 on the PWRUP input causes the device to be in
the active mode ready to demodulate incoming data. A
logic 1 on this pin causes the device to be in the standby
mode, if the RT input pin is at a logic 1. This pin may be con-
trolled by RDO and CDO for auto power–up operation. For
other applications, this pin may be controlled externally.
VSS
Ground (Pin 8)
Ground return pin is typically connected to the system
ground.
OSCout
Oscillator Output (Pin 9)
This pin will have either a crystal or a ceramic resonator
tied to it with the other end connected to OSCin.
OSCin
Oscillator Input (Pin 10)
This pin will have either a crystal or a ceramic resonator
tied to it with the other end connected to OSCout. OSCin may
also be driven directly from an appropriate external source.
CLKSIN
Clock Select Input (Pin 11)
A logic 1 on this input configures the device to accept ei-
ther a 3.579 MHz or 3.6864 MHz crystal. A logic 0 on this pin
configures the part to operate with a 455 kHz resonator.
For crystal and resonator specifications see Table 1.
RDO
Ring Detect Out (Pin 12)
This open–drain output goes low when a valid ringing
signal is detected. RDO remains low as long as the ringing
signal remains valid. This signal can be used for auto power–
up, when connected to Pin 7.
CDO
Carrier Detect Output (Pin 13)
When low, this open drain output indicates that a valid
carrier is present on the line. CDO remains low as long as
the carrier remains valid. An 8 ms hysteresis is built in to
allow for a momentary drop out of the carrier. CDO may be
used in the auto power–up configuration when connected to
PWRUP.
AR
CH
IVE
D B
Y F
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ES
CA
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MI
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UC
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INC
.


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