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| 型号： | DS3251+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/71页 |
| 文件大小： | 0K |
| 描述： | IC LIU DS3/E3/STS-1 144-CSBGA |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 160 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 1/1 |
| 规程： | DS3 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 144-BGA，CSPBGA |
| 供应商设备封装： | 144-TECSBGA（13x13） |
| 包装： | 托盘 |
| 产品目录页面： | 1429 (CN2011-ZH PDF) |
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DS3251/DS3252/DS3253/DS3254
11 of 71
Table 6-B. Receiver Pin Descriptions
Note: These pins are always active.
NAME
FUNCTION
RXPn,
RXNn
I
Receiver Analog Inputs. These differential AMI inputs are coupled to the inbound 75
coaxial cable
through a 1:2 step-up transformer (Figure 2-1).
RCLKn
O3
Receiver Clock. The recovered clock is output on the RCLK pin. Recovered data is output on the
RPOS/RDAT and RNEG/RLCV pins on the falling edge of RCLK (RCINV = 0) or the rising edge of
RCLK (RCINV = 1). During a loss of signal (
RLOS = 0), the RCLK output signal is derived from the
LIU’s master clock.
RPOSn/
RDATn
O3
Receiver Positive AMI/Receiver Data. When the receiver is configured to have a bipolar interface
(RBIN = 0), RPOS pulses high for each positive AMI pulse received. When the receiver is configured
to have a binary interface (RBIN = 1), RDAT outputs decoded binary data. RPOS/RDAT is updated
either on the falling edge of RCLK (RCINV = 0) or the rising edge of RCLK (RCINV = 1).
RNEGn/
RLCVn
O3
Receiver Negative AMI/Line-Code Violation. When the receiver is configured to have a bipolar
interface (RBIN = 0), RNEG pulses high for each negative AMI pulse received. When the receiver is
configured to have a binary interface (RBIN = 1), RLCV pulses high to flag code violations. See
Section 8.6 for further details on code violations. RNEG/RLCV is updated either on the falling edge of
RCLK (RCINV = 0) or the rising edge of RCLK (RCINV = 1).
RTSn
I
Receiver Tri-State Enable (Active Low).
RTS tri-states the RPOS/RDAT, RNEG/RLCV, and RCLK
receiver outputs. This feature supports applications requiring LIU redundancy. Receiver outputs from
multiple LIUs can be wire-ORed together, eliminating the need for external switches or muxes. The
receiver continues to operate internally when
RTS is low.
0 = tri-state the receiver outputs
1 = enable the receiver outputs
RLOSn
O
Receiver Loss of Signal (Active Low, Open Drain).
RLOS is asserted upon detection of 175
±75
consecutive zeros in the receive data stream.
RLOS is deasserted when there are no excessive zero
occurrences over a span of 175
±75 clock periods. An excessive zero occurrence is defined as three
or more consecutive zeros in the DS3 and STS-1 modes or four or more zeros in the E3 mode. See
Section 8.5 for more information.
PRBSn
O
PRBS Detector Output. This signal reports the status of the PRBS detector. See Section 11 for
further details.
Table 6-C. Transmitter Pin Descriptions
Note: These pins are always active.
NAME
FUNCTION
TCLKn
I
Transmitter Clock. A DS3 (44.736MHz
±20ppm), E3 (34.368MHz ±20ppm), or STS-1 (51.840MHz
±20ppm) clock should be applied at this signal. Data to be transmitted is clocked into the device at
TPOS/TDAT and TNEG either on the rising edge of TCLK (TCINV = 0) or the falling edge of TCLK
(TCINV = 1). See Section 9 for additional details.
TPOSn/
TDATn
I
Transmitter Positive AMI/Transmitter Data. When the transmitter is configured to have a bipolar
interface (TBIN = 0), a positive pulse is transmitted on the line when TPOS is high. When the
transmitter is configured to have a binary interface (TBIN = 1), the data on TDAT is transmitted after
B3ZS or HDB3 encoding. TPOS/TDAT is sampled either on the rising edge of TCLK (TCINV = 0) or
on the falling edge of TCLK (TCINV = 1).
TNEGn
I
Transmitter Negative AMI. When the transmitter is configured to have a bipolar interface (TBIN = 0),
a negative pulse is transmitted on the line when TNEG is high. When the transmitter is configured to
have a binary interface (TBIN = 1), TNEG is ignored and should be wired either high or low. TNEG is
sampled either on the rising edge of TCLK (TCINV = 0) or on the falling edge of TCLK (TCINV = 1).
TXPn,
TXNn
O3
Transmitter Analog Outputs. These differential AMI outputs are coupled to the outbound 75
coaxial cable through a 2:1 step-down transformer (Figure 2-1). These outputs can be tri-stated using
the
TTS pin or the TTS or TPS configuration bits.
TDMn
O
Transmitter Driver Monitor (Active Low, Open Drain).
TDM reports the status of the transmit driver
monitor. When the monitor detects a faulty transmitter,
TDM is driven low. TDM requires an external
TTSn
I
Transmitter Tri-State Enable (Active Low).
TTS tri-states the transmitter outputs (TXP and TXN).
This feature supports applications requiring LIU redundancy. Transmitter outputs from multiple LIUs
can be wire-ORed together, eliminating external switches. The transmitter continues to operate
internally when
TTS is active.
0 = tri-state the transmitter output driver
1 = enable the transmitter output driver
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