CDCV857A
- Phase-Lock Loop Clock Driver for Double Data-Rate Synchronous DRAM Applications
- Spread Spectrum Clock Compatible
- Operating Frequency: 60 to 180 MHz
- Low Jitter (cyc–cyc): ±50 ps
- Distributes One Differential Clock Input to Ten Differential Outputs
- Three-State Outputs When the Input Differential Clocks Are <20 MHz
- Operates From Dual 2.5-V Supplies
- Available in a 48-Pin TSSOP Package or 56-Ball MicroStar Junior™ BGA Package
- Consumes < 200-uA Quiescent Current
- External Feedback PIN (FBIN, FBIN\) Are Used to Synchronize the Outputs to the Input Clocks
MicroStar Junior is a trademark of Texas Instruments Incorporated.
The CDCV857A is a high-performance, low-skew, low-jitter zero delay buffer that distributes a differential clock input pair (CLK, CLK\) to ten differential pairs of clock outputs (Y[0:9], Y[0:9]\) and one differential pair of feedback clock output (FBOUT, FBOUT\). The clock outputs are controlled by the clock inputs (CLK, CLK\), the feedback clocks (FBIN, FBIN\), and the analog power input (AVDD). When PWRDWN\ is high, the outputs switch in phase and frequency with CLK. When PWRDWN\ is low, all outputs are disabled to high impedance state (3-state), and the PLL is shut down (low power mode). The device also enters this low power mode when the input frequency falls below a suggested detection frequency that is below 20 MHz (typical 10 MHz). An input frequency detection circuit will detect the low frequency condition and after applying a >20 MHz input signal this detection circuit turns on the PLL again and enables the outputs.
When AVDD is strapped low, the PLL is turned off and bypassed for test purposes. The CDCV857A is also able to track spread spectrum clocking for reduced EMI.
Since the CDCV857A is based on PLL circuitry, it requires a stabilization time to achieve phase-lock of the PLL. This stabilization time is required following power up. The CDCV857A is characterized for operation from 0°C to 85°C.
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | 2.5-V Phase Lock Loop Clock Driver 数据表 (Rev. A) | 2002年 9月 11日 | |||
应用手册 | Design Considerations for TI's CDCV857/CDCV857A/CDCV855 DRR PLL (Rev. A) | 2005年 11月 20日 | ||||
用户指南 | CDCV857 Family Quick Chart | 2004年 4月 22日 | ||||
应用手册 | Design Considerations for TI's CDCV857/CDCV857A DRR PLL | 2002年 1月 10日 |
设计和开发
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封装 | 引脚 | CAD 符号、封装和 3D 模型 |
---|---|---|
TSSOP (DGG) | 48 | Ultra Librarian |
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