- 您現在的位置：買賣IC網 > PDF目錄385892 > SY69952ZH (MICREL INC) OC-3/STS-3 CLOCK RECOVERING TRANSCEIVER PDF資料下載
參數資料
| 型號： | SY69952ZH |
| 廠商： | MICREL INC |
| 元件分類： | 數字傳輸電路 |
| 英文描述： | OC-3/STS-3 CLOCK RECOVERING TRANSCEIVER |
| 中文描述： | TRANSCEIVER, PDSO28 |
| 封裝： | 0.300 INCH, LEAD FREE, SOIC-28 |
| 文件頁數： | 4/8頁 |
| 文件大?。?/td> | 108K |
| 代理商： | SY69952ZH |
SY69952
4
Micrel, Inc.
M9999-062805
hbwhelp@micrel.com or (408) 955-1690
MODE – 3 Level Input
Frequency Mode Select. This three-level input selects
the frequency range for the clock and data recovery receive
PLL and the frequency multiplier transmit PLL. When the
input is held PECL HIGH (V
CC
–0.9 typ.), the two PLLs
operate at the SONET (SDH) STS-3 (STM-1) line rate of
155.52MHz. When this input is held TTL LOW (connected
to GND), the two PLLs operate at one SONET STS-1 line
rate of 51.84MHz. The REFCLK± frequency in both operating
modes is 1/8 of the operating frequency. When the MODE
input is ECL LOW (V
CC
– 1.7 typ), the device enters into
test mode, the TSER± inputs substitue for the internal PLL
VCO for use in factory testing.
PIN DESCRIPTIONS
DESCRIPTION
General
The SY69952 Serial SONET/SDH Transceiver is used in
SONET/SDH and ATM applications to recover clock and
data information from a 155.52MHz or 51.84MHz NRZ (Non
Return to Zero) or NRZI (Non Return to Zero Invert on
ones) serial data stream. This device also provides a bit-
rate Transmit clock, from a byte rate source through the
use of a frequency multiplier PLL, and differential data
buffering for the Transmit side of the system. This device is
compliant with all relevant SONET/SDH specifications
including ANSI T1X1.6/91-022, ANSI T1X1.3/93-006R1 Draft
and ITU/CCITT G958.
Operating Frequency
The SY69952 operates at either of two frequency ranges.
The MODE input selects which of the two frequency ranges
the Transmit frequency multiplier PLL and the Receive clock
and data recovery PLL will operate. When MODE is
connected to V
CC
, the highest operating range of the device
is selected. A 19.44MHz ± 1% source must drive the
REFCLK input and the two PLLs will multiply this rate by 8
to provide output clocks that operate at 155.52MHz ± 1%.
When the MODE input is connected to ground (GND), the
lowest operating range of the device is selected. A 6.48MHz
± 1% source must drive the REFCLK inputs and the two
PLLs will multiply this rate by 8 to provide output clocks that
operate at 51.84MHz ± 1%.
Transmit Functions
The transmit section of the SY69952 contains a PLL that
takes a REFCLK input and multiplies it by 8 (REFCLKx8) to
produce a PECL (Positive ECL) differential output clock
(TCLK±). The transmitter has two operating ranges that are
selectable with the three-level MODE pin as explained
above. The SY69952 Transmit frequency multiplier PLL
allows low-cost byte rate clock sources to be used to time
the upstream serial data transmitter.
The REFCLK± input can be configured three ways. When
both REFCLK+ and REFCLK- are connected to a differential
100K-compatible PECL source, the REFCLK input will
behave as a differential PECL input. When either the
REFCLK+ or the REFCLK- input is at a TTL LOW, the
other REFCLK input becomes a TTL-level input allowing it
to be connected to a low-cost TTL crystal oscillator. The
REFCLK input structure, therefore, can be used as a
differential PECL input, a single TTL input, or as a dual TTL
clock multiplexing input.
Figure 1. Suggested Loop Filter Values
PLL1±, PLL2± – Loop Filter Inputs
These pins are used to connect the external loop filters
for the two on-board PLLs. See below:
相關PDF資料 |
PDF描述 |
|---|---|
| SY87700AL | Low-Power, 3.3V, 32Mbps to 208Mbps AnyRate Clock and Data Recovery |
| SY87700ALHG | Low-Power, 3.3V, 32Mbps to 208Mbps AnyRate Clock and Data Recovery |
| SY87700ALZG | Low-Power, 3.3V, 32Mbps to 208Mbps AnyRate Clock and Data Recovery |
| SY87700LHG | 3.3V 32-175Mbps AnyRate CLOCK AND DATA RECOVERY |
| SY87700LHGTR | 3.3V 32-175Mbps AnyRate CLOCK AND DATA RECOVERY |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SY69952ZH TR | 功能描述:計時器和支持產品 OC-3/STS-3 Clock Recovering Transceiver (Green) RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內部定時器數量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| SY6BA9A | 制造商:APEM 功能描述:BA9S 6VAC/DC YELLOW LED |
| SY-6-K | 功能描述:低信號繼電器 - PCB SIGNAL RoHS:否 制造商:NEC 觸點形式:2 Form C (DPDT-BM) 觸點電流額定值: 線圈電壓:5 V 最大開關電流:1 A 線圈電流:1 A 線圈類型:Non-Latching 功耗:140 mW 端接類型:SMT 絕緣: 介入損耗: |
| SY-6W-K | 功能描述:低信號繼電器 - PCB SIGNAL RoHS:否 制造商:NEC 觸點形式:2 Form C (DPDT-BM) 觸點電流額定值: 線圈電壓:5 V 最大開關電流:1 A 線圈電流:1 A 線圈類型:Non-Latching 功耗:140 mW 端接類型:SMT 絕緣: 介入損耗: |
| SY7/8TF | 制造商:UNBRANDED 功能描述:BEARING PILLOW UNIT |
發(fā)布緊急采購，3分鐘左右您將得到回復。