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8T49N287A-DDDNLGI中文资料
8T49N287A-DDDNLGI数据手册规格书PDF详情
Description
The 8T49N287 has two independent, fractional-feedback PLLs that
can be used as jitter attenuators and frequency translators. It is
equipped with six integer and two fractional output dividers, allowing
the generation of up to 8 different output frequencies, ranging from
8kHz to 1GHz. Four of these frequencies are completely independent
of each other and the inputs. The other four are related frequencies.
The eight outputs may select among LVPECL, LVDS, HCSL, or
LVCMOS output levels.
This makes it ideal to be used in any frequency translation
application, including 1G, 10G, 40G and 100G Synchronous
Ethernet, OTN, and SONET/SDH, including ITU-T G.709 (2009) FEC
rates. The device may also behave as a frequency synthesizer.
The 8T49N287 accepts up to two differential or single-ended input
clocks and a crystal input. Each of the two internal PLLs can lock to
different input clocks which may be of independent frequencies. Each
PLL can use the other input for redundant backup of the primary
clock, but in this case, both input clocks must be related in frequency.
The device supports hitless reference switching between input clocks.
The device monitors all input clocks for Loss of Signal (LOS), and
generates an alarm when an input clock failure is detected. Automatic
and manual hitless reference switching options are supported. LOS
behavior can be set to support gapped or un-gapped clocks.
The 8T49N287 supports holdover for each PLL. The holdover has an
initial accuracy of ±50ppB from the point where the loss of all
applicable input reference(s) has been detected. It maintains a
historical average operating point for each PLL that may be returned
to in holdover at a limited phase slope.
The device places no constraints on input to output frequency conversion, supporting all FEC rates, including the new revision of ITU-T Recommendation G.709 (2009), most with 0ppm conversion error.
Each PLL has a register-selectable loop bandwidth from 1.4Hz to
360Hz.
Each output supports individual phase delay settings to allow
output-output alignment.
The device supports Output Enable inputs and Lock, Holdover and
LOS status outputs.
The device is programmable through an I2C interface. It also supports
I
2C master capability to allow the register configuration to be read
from an external EEPROM.
Features
• Supports SDH/SONET and Synchronous Ethernet clocks
including all FEC rate conversions
• <0.3ps RMS Typical jitter (including spurs), 12kHz to 20MHz
• Operating modes: locked to input signal, holdover and free-run
• Initial holdover accuracy of ±50ppb
• Accepts up to two LVPECL, LVDS, LVHSTL, HCSL, or LVCMOS
input clocks
• Accepts frequencies ranging from 8kHz up to 875MHz
• Auto and manual input clock selection with hitless switching
• Clock input monitoring, including support for gapped clocks
• Phase-Slope Limiting and Fully Hitless Switching options to
control output phase transients
• Operates from a 10MHz to 40MHz fundamental-mode crystal
• Generates 8 LVPECL / LVDS / HCSL or 16 LVCMOS output clocks
• Output frequencies ranging from 8kHz up to 1.0GHz (diff)
• Output frequencies ranging from 8kHz to 250MHz (LVCMOS)
• Four General Purpose I/O pins with optional support for status &
control:
• Four Output Enable control inputs may be mapped to any of the
eight outputs
• Lock, Holdover and Loss-of-Signal status outputs
• Open-drain Interrupt pin
• Nine programmable loop bandwidth settings for each PLL from
1.4Hz to 360Hz
• Optional Fast Lock function
• Programmable output phase delays in steps as small as 16ps
• Register programmable through I2C or via external I2C EEPROM
• Bypass clock paths for system tests
• Power supply modes
VCC / VCCA / VCCO
3.3V / 3.3V / 3.3V
3.3V / 3.3V / 2.5V
3.3V / 3.3V / 1.8V (LVCMOS)
2.5V / 2.5V / 3.3V
2.5V / 2.5V / 2.5V
2.5V / 2.5V / 1.8V (LVCMOS)
• -40°C to 85°C ambient operating temperature
• Package: 56QFN, lead-free (RoHS 6)
供应商 | 型号 | 品牌 | 批号 | 封装 | 库存 | 备注 | 价格 |
---|---|---|---|---|---|---|---|
RENESAS |
20000 |
原装现货,可追溯原厂渠道 |
|||||
Renesas |
22+ |
SMD |
518000 |
明嘉莱只做原装正品现货 |
|||
RENESAS |
22+ |
NA |
3545 |
原装正品支持实单 |
|||
RENESAS |
23+ |
NA |
6000 |
全新、原装 |
|||
Renesas |
21+ |
25000 |
原厂原包 深圳现货 主打品牌 假一赔百 可开票! |
||||
Renesas |
23+ |
80-LBGA |
6679 |
确保原装正品,专注终端客户一站式BOM配单 |
|||
RENESAS(瑞萨)/IDT |
23+ |
BGA80(10x10) |
6000 |
诚信服务,绝对原装原盘 |
|||
RENESAS(瑞萨)/IDT |
2021+ |
CABGA-80(10x10) |
499 |
||||
RENESAS(瑞萨)/IDT |
1942+ |
CABGA-80(10x10) |
2532 |
向鸿只做原装,仓库库存优势数量请确认 |
|||
RENESAS(瑞萨)/IDT |
2117+ |
CABGA-80(10x10) |
315000 |
一级代理专营品牌!原装正品,优势现货,长期排单到货 |
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Renesas Technology Corp 瑞萨科技有限公司
瑞萨科技公司(Renesas Technology Corp.)是一家全球领先的半导体解决方案供应商,总部位于日本东京。公司成立于2002年,由原日立半导体和三菱电机半导体合并而成,专注于提供高性能和高效能的微控制器、模拟和混合信号IC、功率半导体以及系统集成解决方案,广泛应用于汽车、工业控制、信息通信、消费电子等多个领域。瑞萨科技的产品组合涵盖微控制器(MCUs)、模拟和混合信号IC、功率半导体以及汽车解决方案等。公司在汽车电子领域具有强大的技术实力,提供车载MCU、传感器和网络解决方案,支持智能汽车的发展。瑞萨在全球设有多个研发中心和分支机构,产品及解决方案销售至欧美、亚洲等地区,致力于为