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參數(shù)資料
| 型號： | XRT7300IVTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 53/55頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E3/DS3/STS-1 SGL 44TQFP |
| 標準包裝： | 1,000 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | DS3，E3，STS-1 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LQFP |
| 供應(yīng)商設(shè)備封裝： | 44-TQFP（10x10） |
| 包裝： | 帶卷 (TR) |
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XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
3
PIN DESCRIPTION
PIN #
SYMBOL
TYPE
DESCRIPTION
1
TXLEV
I
Transmit Line Build-Out Enable/Disable Select:
This input pin is used to enable or disable the Transmit Line Build-Out circuit in
the XRT7300.
Setting this pin to “High” disables the Line Build-Out circuit. In this mode, the
XRT7300 outputs partially shaped pulses onto the line via the TTIP and TRING
output pins.
Setting this pin to “Low” enables the Line Build-Out circuit. In this mode, the
XRT7300 outputs partially-shaped pulses onto the line via the TTIP and TRING
output pins.
To comply with the isolated DSX-3/STSX-1 Pulse Template Requirements per
Bellcore GR-499-Core or Bellcore GR-253-Core:
1. Set this input pin to a "1" if the cable length between the Cross-Connect and
the transmit output of the XRT7300 is greater than 225 feet.
2. Set this input pin to a "0" if the cable length between the Cross-Connect and
the transmit output of the XRT7300 is less than 225 feet.
This pin is active only if both of the following are true:
(a) The XRT7300 is configured to operate in either the DS3 or SONET STS-1
modes and
(b) The XRT7300 is configured to operate in the Hardware Mode.
NOTE: This pin should be tied to GND if the XRT7300 is to be operated in the
HOST mode.
2
TAOS
I
Transmit All Ones Select:
A “High” on this pin causes a continuous AMI all “1’s” pattern to be transmitted
onto the line. The frequency of this “1’s” pattern is determined by TCLK.
NOTES:
1. This input pin is ignored if the XRT7300 is operating in the HOST Mode.
2. Tie this pin to GND if the XRT7300 is going to be operating in the HOST
Mode.
3
VDD
****
Transmit Digital Power Supply
4
DMO
O
Drive Monitor Output:
If no transmitted AMI signal is present on MTIP and MRING input pins for
128±32 TCLK periods, then the DMO pin toggles and remains “High” until the
next AMI signal is detected.
5
GND
****
Transmit Digital GND
6
GND
****
Analog GND (Substrate)
7
GND
****
Receive Analog GND
8
RTIP
I
Receive TIP Input:
This input pin along with RRING is used to receive the line signal from the
Remote DS3/E3/STS-1 Terminal.
9
RRING
I
Receive RING Input:
This input pin along with RTIP is used to receive the line signal from the Remote
DS3/E3/STS-1 Terminal.
10
VDD
****
Receive Analog VDD
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