PSB 21150 F V1.4 Infineon Technologies, PSB 21150 F V1.4 Datasheet - Page 62

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PSB 21150 F V1.4

Manufacturer Part Number
PSB 21150 F V1.4
Description
IC MODULAR ISDN NT INTELL TQFP64
Manufacturer
Infineon Technologies
Datasheet

Specifications of PSB 21150 F V1.4

Function
PC Adapter Circuit
Interface
HDLC, ISDN, SCI
Number Of Circuits
1
Voltage - Supply
3.3V
Current - Supply
30mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
64-LFQFP
Includes
Activation and Deactivation, D-Channel Access Control, Monitor Channel Handler
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
Other names
PSB21150FV1.4XT
PSB21150FV14NP
PSB21150FV14XP
SP000007575
SP000007577
3.3.7
For both the receive and transmit direction a 1:1 transformer is used to connect the
IPAC-X transceiver to the 4 wire S/T interface. Typical transformer characteristics can
be found in the chapter on electrical characteristics. The connections of the line
transformers is shown in
Figure 31
For the transmit direction an external transformer is required to provide isolation and
pulse shape according to the ITU-T recommendations.
3.3.7.1
The ITU-T I.430 specification for both transmitter and receiver impedances in TEs results
in a conflict with respect to external S-protection circuitry requirements:
– To avoid destruction or malfunction of the S-device it is desirable to drain off even
– To meet the 96 kHz impedance test specified for transmitters and receivers (for TEs
This requirement results from the fact that this test is also to be performed with no supply
voltage being connected to the TE. Therefore the second reference point for
overvoltages V
greater than the combined forward voltages of the diodes, a current exceeding the
specified one may pass the protection circuit.
The following recommendations aim at achieving the highest possible device protection
against overvoltages while still fulfilling the 96 kHz impedance tests.
Data Sheet
small overvoltages reliably.
only, ITU-T I.430 sections 8.5.1.2a and
dimensioned such that voltages below 1.2 V (ITU-T I.430 amplitude) x transformer
ratio are not affected.
S/T Interface Circuitry
External Protection Circuitry
Connection of Line Transformers and Power Supply to the IPAC-X
DD
10 µF
, is tied to GND. Then, if the amplitude of the 96 kHz test signal is
3.3 V
GND
Figure
VDD
VSS
IPAC-X
31.
SR1
SR2
SX1
SX2
62
Protection
Protection
Circuit
Circuit
8.6.1.1) the protection circuit must be
Description of Functional Blocks
1:1
1:1
Transmit
Receive
21150_05
Pair
Pair
PSB/PSF 21150
2003-01-30
IPAC-X

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