82V2088BB IDT, Integrated Device Technology Inc, 82V2088BB Datasheet - Page 16

• Manufacturer Part Number: 82V2088BB
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2088BB

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

OCTAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
3
3.1
channel T1/J1 LIU. In E1 application, the T1E1 bit (GCF0, 40H) should be
set to ‘0’. In T1/J1 application, the T1E1 bit should be set to ‘1’.
3.2
Encoder, an optional Jitter Attenuator, a Waveform Shaper, a set of LBOs,
a Line Driver and a Programmable Transmit Termination.
3.2.1
pin and TDNn pin. In E1 mode, the TCLKn is a 2.048 MHz clock. In T1/J1
mode, the TCLKn is a 1.544 MHz clock. If the TCLKn is missing for more
than 70 MCLK cycles, an interrupt will be generated if it is not masked.
edge of TCLKn. The active edge of TCLKn can be selected by the
TCLK_SEL bit (TCF0, 02H...). And the active level of the data on TDn/TDPn
and TDNn can be selected by the TD_INV bit (TCF0, 02H...).
ways: Single Rail and Dual Rail. In Single Rail mode, only TDn pin is used
for transmitting data and the T_MD[1] bit (TCF0, 02H...) should be set to
‘0’. In Dual Rail Mode, both TDPn and TDNn pins are used for transmitting
data, the T_MD[1] bit (TCF0, 02H...) should be set to ‘1’.
3.2.2
selected to be a B8ZS encoder or an AMI encoder by setting T_MD[0] bit
(TCF0, 02H...).
figured to be a HDB3 encoder or an AMI encoder by setting T_MD[0] bit
(TCF0, 02H...).
T_MD[1] is ‘1’), the Encoder is by-passed. In the Dual Rail mode, a logic ‘1’
on the TDPn pin and a logic ‘0’ on the TDNn pin results in a negative pulse
on the TTIPn/TRINGn; a logic ‘0’ on TDPn pin and a logic ‘1’ on TDNn pin
results in a positive pulse on the TTIPn/TRINGn. If both TDPn and TDNn
are logic ‘1’ or logic ‘0’, the TTIPn/TRINGn outputs a space (Refer to
TDPn, TDNn Pin
3.2.3
before sending it. The first is to use preset pulse templates for short haul
application, the second is to use LBO (Line Build Out) for long haul appli-
cation and the other way is to use user-programmable arbitrary waveform
template.
3.2.3.1 Preset Pulse Templates
the G.703 and the measuring diagram is shown in Figure-5. In internal
impedance matching mode, if the cable impedance is 75 Ω, the PULS[3:0]
The IDT82V2088 can be used as an eight-channel E1 LIU or an eight-
The transmit path of each channel of the IDT82V2088 consists of an
The transmit path system interface consists of TCLKn pin, TDn/TDPn
Transmit data is sampled on the TDn/TDPn and TDNn pins by the active
The transmit data from the system side can be provided in two different
When T1/J1 mode is selected, in Single Rail mode, the Encoder can be
When E1 mode is selected, in Single Rail mode, the Encoder can be con-
In both T1/J1 mode and E1 mode, when Dual Rail mode is selected (bit
The IDT82V2088 provides three ways of manipulating the pulse shape
For E1 applications, the pulse shape is shown in
FUNCTIONAL DESCRIPTION
T1/E1/J1 MODE SELECTION
TRANSMIT PATH
TRANSMIT PATH SYSTEM INTERFACE
ENCODER
PULSE SHAPER
Description).
Figure-4
according to
TDn/
16
bits (TCF1, 03H...) should be set to ‘0000’; if the cable impedance is 120
Ω, the PULS[3:0] bits (TCF1, 03H...) should be set to ‘0001’. In external
impedance matching mode, for both E1/75 Ω and E1/120 Ω cable imped-
ance, PULS[3:0] should be set to ‘0001’.
the T1.102 and the measuring diagram is shown in
meets the requirement of G.703, 2001. The cable length is divided into five
grades, and there are five pulse templates used for each of the cable length.
The pulse template is selected by PULS[3:0] bits (TCF1, 03H...).
Note: 1. For R
For T1 applications, the pulse shape is shown in
-0.2
-0.4
-0.6
1.2
0.8
0.6
0.4
0.2
2. For R
1
0
IDT82V2088
Figure-4 E1 Waveform Template Diagram
0
Figure-5 E1 Pulse Template Test Circuit
1 .2 0
1 .0 0
0 .6 0
0 .4 0
-0 .2 0
0 .8 0
0 .2 0
0 .0 0
Figure-6 DSX-1 Waveform Template
LOAD
LOAD
-0 .6
= 75 Ω (nom), V
=120 Ω (nom), V
250
- 0 .4
TTIPn
TRINGn
- 0 .2
out
500
out
(Peak)=2.37V (nom)
T im e in U n it In te rv a ls
(Peak)=3.00V (nom)
Time (ns)
0
TEMPERATURE RANGES
750
0 .2
Figure-6
R
LOAD
Figure-7.
1000
0 .4
INDUSTRIAL
according to
V
This also
0 .6
OUT
1250