82V2044BB IDT, Integrated Device Technology Inc, 82V2044BB Datasheet - Page 19

• Manufacturer Part Number: 82V2044BB
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2044BB

• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

Table-13 Transformer Specifications
1.
2.8
are driven through a pair of 9.5
2.9
connected with TTIPn and TRINGn, can detect short circuit failure
between TTIPn and TRINGn pins. Bit SCPB in register GCF decides
whether the output driver short circuit protection is enabled. When the
short circuit protection is enabled, the driver output current is limited to a
typical value: 180 mAp. Also, register DF, DFI and DFM will be available.
When DFMON will detect a short circuit, register DF will be set. With a
short circuit failure detected, register DFI will be set and an interrupt will
be generated on pin INT.
STD Temp.
Pulse T1124 transformer is recommended to be used in Standard (STD) operating temperature range (0°C to 70°C), while Pulse T1114 transformer is recommended to be used in
Extended (EXT) operating temperature range is -40°C to +85°C.
IDT82V2044
Functional Description
All transmit driver power supplies must be 5.0 V or 3.3 V.
In E1 mode, despite the power supply voltage, the 75
An internal power Driver Failure Monitor (DFMON), parallel
T1124
TRANSMIT DRIVER POWER SUPPLY
POWER DRIVER FAILURE MONITOR
Part No.
EXT Temp.
T1114
NOTE:
1. Pulse T1124 transformer is recommended to be used in Standard (STD) operating temperature range (0°C to 70°C), while Pulse T1114
transformer is recommended to be used in Extended (EXT) operating temperature range is -40°C to +85°C. See Transformer Specifications
Table for details.
2. Typical value. Adjust for actual board parasitics to obtain optimum return loss.
3. Common decoupling capacitor for all VDDT and GNDT pins. One per chip.
4. The R
R
Turns Ratio (Pri: sec ± 2%)
and R
Transmit
1:2CT
Ω
R
T
series resistors and a 1:2 transformer.
X
values are listed in Table-12.
T
Line
X
Line
A
B
(1)
Figure-12 External Transmit/Receive Line Circuitry
•
•
Receive
2:1
1CT:2
2:1
1
1
•
•
0.22 µF
Cp
2
•
•
•
Ω
OCL @ 25°C (mH MIN)
Transmit
1 kΩ
R
R
1 kΩ
Electrical Specification @ 25°C
/120
R
R
R
R
1.2
T
T
VDDT
Ω
VDDT
D2
D1
D4
lines
D3
·
·
Receive
19
RRINGn
TRINGn
RTIPn
1.2
TTIPn
One of Four Identical Channels
through a pair of 9.1
mize the power consumption of the device, series resistors are removed
in this case.
harsh cable environment, series resistors are required to improve the
transmit return loss performance and protect the device from surges
coupling into the device.
2.10 TRANSMIT LINE SIDE SHORT CIRCUIT FAILURE
with TTIPn and TRINGn pins and limit the output current. In this case,
the output current is a limited value which is always lower than the
typical line short circuit current 180 mAp, even if the transmit line side is
shorted.
2.11 LINE PROTECTION
the line driver and improve the design robustness. In receive side, the
series resistors of 1 k
In T1 mode, only 5.0 V can be selected. 100
For T1 applications, only 5.0 V operation is supported. However, in
In E1 or T1 with 5 V VDDT, a pair of 9.5
Refer to
In transmit side, the Schottky diodes D1~D4 are required to protect
Transmit
DETECTION
QUAD T1/E1 SHORT HAUL LINE INTERFACE UNIT
.6
L
L
Table-12 External Components Values
(µH MAX)
VDDDn
GNDTn
Receive
.6
Ω
Ω
0.1 µF
are used to protect the receiver against current
series resistors and a 1:2 transformer. To opti-
VDDT
•
•
Transmit
C
35
W/W
(pF MAX)
68 µF
Receive
3
35
Ω
September 22, 2005
serial resistors connect
for details.
Package/Schematic
Ω
lines are driven
TOU/3