PBL38650/2QNT Infineon Technologies, PBL38650/2QNT Datasheet - Page 41

• Manufacturer Part Number: PBL38650/2QNT
• Description: IC LINE INTERFACE SLIC PLCC-28
• Manufacturer: Infineon Technologies
• Series: FlexiSLIC™r

Specifications of PBL38650/2QNT

• Function: Subscriber Line Interface Concept (SLIC)
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 2.8mA
• Power (watts): 730mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Includes: Current Feeding, Ground Key Detector, Ring Relay Driver
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Other names: PBL38650/2QNTT; SP000007905

6.3
The widely varying environmental conditions in which SLICs operate may lead to the
chip temperature limitations being exceeded. The PBL 38650/2 SLIC reduces the DC
line current when the chip temperature reaches approximately 145
current again automatically when the temperature drops. Accordingly transmission is not
lost under high ambient temperature conditions.
The detector output, DET, is forced to a logic low level when the temperature guard is
active.
7
The loop current, ground key and ring-trip detectors report their status through a
common output, DET. The particular detector to be connected to the detector pin, DET,
is selected via the three bit control interface C1, C2 and C3. Please refer to Chapter 9
for a description of the control interface.
7.1
The loop current detector indicates that the telephone is off-hook and that DC current is
flowing in the loop by setting the output pin DET to a logic low level when selected. The
loop current detector threshold value,
state, is programmable with the
and is calculated according to:
The loop current detector is internally filtered and is not influenced by the AC signal at
the two-wire side.
7.2
The ground key detector indicates when the ground key is pressed (active) by setting the
output pin DET to a logical high level when selected. The ground key detector circuit
senses the difference in TIPX and RINGX currents. When the current at the RINGX side
exceeds the current at the TIPX side with the threshold value the detector is triggered.
For threshold current values, please refer to the datasheet.
7.3
Ring trip detection is accomplished by connecting an external network to a comparator
in the SLIC with inputs DT and DR. The ringing source can be balanced or unbalanced
superimposed on
Data Sheet
R
LD
=
500
--------- -
I
Lth
Analog Temperature Guard
Loop Monitoring Functions
Loop Current Detector
Ground Key Detector
Ring Trip Detector
V
B
or GND. The unbalanced ringing source may be applied to either
R
LD
resistor.
I
LTh
41
, where the loop current detector changes
R
LD
connects between pin PLD and ground
Loop Monitoring Functions
o
C and increases line
Rev. 2.0, 2005-04-14
PBL 38650/2
FlexiSLIC
[17]