PSB2186N-V11TR Infineon Technologies, PSB2186N-V11TR Datasheet - Page 47

• Manufacturer Part Number: PSB2186N-V11TR
• Description: IC ISDN SUBSCRIB ACCESS 44-PLCC
• Manufacturer: Infineon Technologies

Specifications of PSB2186N-V11TR

• Controller Type: Subscriber Access Controller (ISDN)
• Interface: 4-Wire SPI Serial
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 17mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Other names: PSB2186N-V11INTR; PSB2186N-V11TR

2.4.2
For both receive and transmit direction, a 2:1 transformer is used to connect the ISAC-S TE
transceiver to the 4 wire S/T interface. The corrections are shown in figure 23.
Figure 23
ISAC-S TE External S-Interface Circuitry
The full-bauded pseudo-ternary pulse shaping is achieved with the integrated transmitter
which is realized as a current limited voltage source. A voltage of 2.1 V is delivered between
SX1-SX2, which yields a current of 7.5 mA over 280 .
The receiver is designed as a threshold detector with adaptively switched threshold levels. Pin
SR1 delivers 2.5 V as an output, which is the virtual ground of the input signal on pin SR2.
The external transformer of ratio 2:1 is needed in both receive and transmit direction to provide
for isolation and transform voltage levels according to CCITT recommendations.
The equivalent circuits of the integrated receiver and transmitter are shown in figure 24.
Figure 24
Equivalent Internal Circuits of Receiver and Transmitter Stages
Semiconductor Group
Analog Functions
ISAC
R
-S TE PSB 2186
50 k
10 µF
+ 5 V
2.5 V
GND
-
+
50 k
40
40 k
V
V
V
DD
ISAC -S TE
SSD
SSA
k
ITS05939
PEB 2086
PSB 2186
SR1
SR2
SR2
SX2
SR1
SX1
47
switch position shown for negative pulses
2.1
2.1
V
V
2 : 1
2 : 1
ISAC
¾
Transmit
Receive
R
ITS05640
13.4
-S TE PSB 2186
Pair
Pair
Functional Description
mA
ITS05940
SX1
SX2