FLLXT384BE.A5 Intel, FLLXT384BE.A5 Datasheet - Page 54

• Manufacturer Part Number: FLLXT384BE.A5
• Manufacturer: Intel

Specifications of FLLXT384BE.A5

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

Intel
6.4.2.1
6.4.2.2
54
Caution:
Table 20. Line Length Equalizer Inputs
®
LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
Note:
In the Hardware mode, if TCLK is connected high 16 consecutive MCLK clock cycles and MCLK
is:
When the pulse-shaping circuit is disabled, it is possible to overheat and damage the LXT384
Transceiver by leaving transmit inputs connected high continuously. For example, if a
programmable ASIC is used in a system that uses the LXT384 Transceiver, the ASIC outputs
might be left high until the ASIC is fully programmed. To prevent damage to the LXT384
Transceiver, use either one of the following practices:
LXT384 Transceiver Hardware Mode
In hardware mode, pins LEN0-2 of the LXT384 Transceiver determine the pulse shaping as
described in
In hardware mode, all eight ports will share the same pulse shaping setting. Independent pulse
shaping for each channel is available in host mode.
LXT384 Transceiver Host Mode
In Host Mode, the contents of the Pulse Shaping Data Register (PSDAT) on the LXT384
Transceiver determines the shape of pulse output at TTIP/TRING. Refer to
LEN2
1. Line length from LXT384 Transceiver to DSX-1 cross-connect point.
2. Maximum cable loss at 772KHz.
•
•
•
•
0
1
1
1
1
0
Not supplied (or ‘low’), the transmit pulse-shaper circuit shown in
is, disabled). In this case, TPOS and TNEG control the pulse width and polarity on TTIP and
TRING.
Supplied, the driver enters into a special mode known as Transmit All Ones, or ‘TAOS’. For
more information on the TAOS mode, see
Chapter 8.0,
Apply a clock to one of these signals: TPOS, TNEG, TCLK, or MCLK.
Set one of these signals low: TPOS, TNEG, TCLK, or OE.
LEN1
1
0
0
1
1
0
Table
LEN0
“Registers”.
1
0
1
0
1
0
20. The LEN settings also determine whether the operating mode is T1 or E1.
0 - 133 ft. ABAM
133 - 266 ft. ABAM
266 - 399 ft. ABAM
399 - 533 ft. ABAM
533 - 655 ft. ABAM
E1 G.703, 75Ω coaxial cable and 120 Ω twisted pair
cable.
Line Length
1
Section 6.8, “Transmit All Ones Operations”
Cable Loss
0.6 dB
1.2 dB
1.8 dB
2.4 dB
3.0 dB
2
Figure 1
Revision Date: November 28, 2005
Table 44
Document Number: 248994
Operation Mode
is bypassed (that
Revision Number: 005
and
T1
E1
Table
and
45.