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參數(shù)資料
| 型號(hào)： | MAX3831 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +3.3V, 2.5Gbps, SDH/SONET, 4-Channel Interconnect Mux/Demux ICs with Clock Generator |
| 中文描述： | +3.3V、2.5Gbps、SDH/SONET、4通道互連復(fù)用/解復(fù)用IC，帶有時(shí)鐘發(fā)生器 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大小： | 285K |
| 代理商： | MAX3831 |
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_______________Detailed Description
The MAX3831/MAX3832 use a 4:1 mux and 1:4 demux
with an elastic store buffer to simplify SDH/SONET
interconnect I/O routing. The 622Mbps low-voltage dif-
ferential signal (LVDS) parallel inputs pass through the
10-bit elastic store buffer, which accommodates ±7.5ns
skew on any single input relative to the 155MHz refer-
ence clock input RCLKI. This reference clock is
required to synthesize the internal 2.488GHz clock
used to drive the elastic store and 4:1 multiplexer. All
TTL and LVDS outputs can be placed in a high-imped-
ance state. See Figure 4 for a functional diagram.
The 4:1 mux bit-interleaves the parallel data, providing
a 2.488Gbps CML serial output to the optical or electri-
cal driver. The CML serial input receives the
2.488Gbps data, the demux deinterleaves it to
622Mbps and sends the data to the frame detector.
The frame detector monitors one 622Mbps channel and
rolls the demux into the proper channel assignment.
The MAX3831/MAX3832 include high-speed, built-in
self-test (BIST), which also allows testing of the
622Mbps parallel-system loopback and the 2.488Gbps
line loopback.
Elastic Store Buffer
Each parallel-data input, PDI1 to PDI4, passes through
its respective 10-bit elastic store buffer. Following an
elastic store reset, this buffer accommodates ±7.5ns of
skew on any input relative to the 155MHz reference
clock. Figure 5 illustrates the elastic store buffer rela-
tionship with RCLKI. The Elastic Store Range graph in
the
Typical Operating Characteristics
shows the
amount of data skew tolerated.
Following a 10μs power-up period, the locations of the
individual data-channel bit transitions are acquired,
guaranteeing data preservation. The output of this
block passes directly into the 4:1 mux. After power-up,
the elastic store buffer must be reset by applying a low
pulse on
RSETES
for at least 10ns.
Due to the inherent uncertainty of the data transitions
between the parallel-data inputs there is no bit or frame
alignment between these inputs. However, the demux
ensures proper channel assignment is maintained.
Bit-Interleaved Multiplexer/
Demultiplexer
The MAX3831/MAX3832 use a bit interleave/deinterleave
mux/demux. To guarantee channel assignment, one of
the four channels is inverted before multiplexing to pro-
vide a reference for the frame detector during demulti-
plexing. After demultiplexing, the same channel is
inverted back to the original data format.
Frame Detector
After a 2.5Gbps serial data is bit deinterleaved into four
622Mbps channels, an SDH/SONET frame detector
monitors the fourth channel, looking for the 32-bit pat-
tern (A1A1A2A2) in the OC-12 header. To maintain cor-
rect channel assignment, the demux outputs rotate until
this 32-bit overhead pattern is reliably detected. A loss-
of-frame output,
LOF
, indicates when the received data
is in or out of frame. When
LOF
goes high, the frame
pattern is detected and the demux outputs are correct-
ly assigned. When
LOF
is low, the frame detection cir-
cuitry is searching for the correct frame. A
RSETFR
(TTL, active low) is included to reset the frame detector
when necessary.
The frame detector uses an algorithm to detect an in-
frame condition and a loss-of-frame condition; this algo-
rithm is implemented to meet the SONET in-frame and
false-frame specs. The frame_search state will occur
upon start-up or reset. In this state, the frame detector
scans through the incoming serial data searching for the
framing pattern in the channel 4 output of the demux.
While in this state, if the framing pattern is not found
within 250μs, the demux channels are shifted (rolled)
and the frame search continues (Figure 6).
In-frame will be declared if two consecutive framing
patterns are found at the correct byte locations within
the SONET frame (9720 bytes). If this pattern is not pre-
M
+3.3V, 2.5Gbps, SDH/SONET, 4-Channel
Interconnect Mux/Demux ICs with Clock Generator
_______________________________________________________________________________________________________
7
Pin Description (continued)
PIN
FUNCTION
NAME
58
Elastic Store Reset. The elastic buffer is centered on a rising edge of
RSETES
, maximizing
the elastic store range. Data must be present for 10μs before applying a pulse of at least
10ns. An internal 15k
pull-up resistor pulls
RSETES
high for normal operation.
RSETES
62
61
Negative PLL Filter Capacitor Input. Connect a 0.33μF capacitor between FIL+ and FIL-.
Positive PLL Filter Capacitor Input. Connect a 0.33μF capacitor between FIL+ and FIL-.
FIL-
FIL+
EP
Ground. This must be soldered to a circuit board for proper thermal performance (see
Package Information
).
Exposed Paddle
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3831UCB | +3.3V, 2.5Gbps, SDH/SONET, 4-Channel Interconnect Mux/Demux ICs with Clock Generator |
| MAX3832UCB | Dual LVDS Transmitter/Receiver 16-SOIC -40 to 85 |
| MAX3841 | Dual LVDS Transmitter/Receiver 16-TSSOP -40 to 85 |
| MAX3841ETG | Dual LVDS Transmitter/Receiver 16-TSSOP -40 to 85 |
| MAX385EJE | Precision, Low-Voltage Analog Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3831EVKIT | 功能描述:其他開(kāi)發(fā)工具 RoHS:否 制造商:Parallax 產(chǎn)品:ELEV-8 Hex Upgrade Kits 類(lèi)型:Robotics 工具用于評(píng)估:ELEV-8 Quadcopter 工作電源電壓: |
| MAX3831UCB-D | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| MAX3831UCB-TD | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| MAX3832EVKIT | 功能描述:其他開(kāi)發(fā)工具 RoHS:否 制造商:Parallax 產(chǎn)品:ELEV-8 Hex Upgrade Kits 類(lèi)型:Robotics 工具用于評(píng)估:ELEV-8 Quadcopter 工作電源電壓: |
| MAX3832UCB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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