參數(shù)資料
型號(hào)： XR-T7288
廠商： Exar Corporation
英文描述： CEPT1 Line Interface
中文描述： CEPT1線路接口
文件頁(yè)數(shù)： 4/24頁(yè)
文件大小： 293K
代理商： XR-T7288
XR-T7288
4
Rev. 1.01
PIN DESCRIPTION (CONT’D)
Pin #
Symbol
Type
Description
11
LP3
I
Loopback 3 Enable (Active-Low).
This pin is cleared for a digital local loopback. Only the
transmit and receive digital sections are exercised in this loopback (internal pull-up is in-
cluded).
12
ALMT
I
Alarm Test Enable (Active-Low).
This pin is cleared, forcing LOS = 0, LOC= 0, and VIO =
1 for testing without affecting data transmission (internal pull-up is included).
Receive Blue Control.
This pin is set to insert the blue signal (AIS) on the receive side (in-
ternal pull-down is included).
Transmit Blue Control.
This pin is set to insert the blue signal (AIS) on the transmit side.
This control has priority over a loopback 2 if both are operated (internal pull-down is included).
13
RBC
I
14
TBC
I
15
BClk
I
Blue Clock.
Blue clock (AIS) input signal (2.048MHz
dent of the transmit clock.
80ppm). This clock can be indepen-
16
SR/DR
I
Single-Rail (Active-Low)/Dual-Rail Operation.
If SR/DR = 0 (internal pull-down is in-
cluded), single-rail operation is selected; if SR/DR = 1, dual-rail operation is selected (see
Tables 3-5).
17
FLM
I
Framer Logic Mode.
If FLM = 0 (internal pull-down is included), logic mode 1 operation oc-
curs. If FLM = 1, logic mode 2 operation occurs (see Tables 3-5).
No Connection.
Test pin for manufacturing purposes only. This pin must be left floating or
tied to GNDD.
Digital Ground.
18
NC
19
GNDD
20
R2
O
Transmit Bipolar Ring.
Negative bipolar transmit output.
21
V
DD
D
T2
5V Digital Supply (
10%).
22
O
Transmit Bipolar Tip.
Positive bipolar transmit output.
Impedance Select.
This pin is cleared for 75
coaxial cable operation and set for 120
shielded twisted-pair operation (internal pull-down is included)
23
ZS
I
24
V
DD
A
GNDA
5V Analog Supply (
10%).
25
Analog Ground.
26
SD
I
Shutdown Enable.
If this pin is high, a loss-of-signal detection (LOS= 0)
forces LOC low and causes the following (see Table 2):
For single-rail operation: RClk high, RDATA low.
For dual-rail, logic mode 1 operation RClk high, RPDATA and RNDATA low.
For dual-rail, logic mode 2 operation: RClk low, RPDATA and RNDATA high (internal pull-
down is included).
27
R1
I
Receive Bipolar Ring.
Negative bipolar receive input
28
T1
I
Receive Bipolar Tip.
Positive bipolar receive input.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT7288IP 制造商:Exar Corporation 功能描述: 制造商:Exar Corporation 功能描述:DATACOM, PCM TRANSCEIVER, PDIP28
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XR-T7288IW 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCM Transceiver
XR-T7295 制造商:EXAR 制造商全稱:EXAR 功能描述:DS3/Sonet STS-1 Integrated Line Receiver
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