CDCUA877 - 1.8V Phase-Lock Loop Clock Driver for DDR2 SDRAM Applications

CDCUA877是TI德州仪器公司的一款DDR2PLL产品，CDCUA877是1.8V Phase-Lock Loop Clock Driver for DDR2 SDRAM Applications，本站介绍了CDCUA877的封装应用图解、特点和优点、功能等，并给出了与CDCUA877相关的TI元器件型号供参考。

CDCUA877 - 1.8V Phase-Lock Loop Clock Driver for DDR2 SDRAM Applications - DDR2PLL - 存储器接口时钟和寄存器 - 德州仪器

产品描述

The CDCUA877 is a high-performance, low-jitter, low-skew, zero-delay buffer that distributes a differential clock input pair (CK, CK) to ten differential pairs of clock outputs (Yn, Yn) and to one differential pair of feedback clock outputs (FBOUT, FBOUT). The clock outputs are controlled by the input clocks (CK, CK), the feedback clocks (FBIN, FBIN), the LVCMOS control pins (OE, OS), and the analog power input (AVDD). When OE is low, the clock outputs, except FBOUT/FBOUT, are disabled while the internal PLL continues to maintain its locked-in frequency. OS (output select) is a program pin that must be tied to GND or VDD. When OS is high, OE functions as previously described. When OS and OE are both low, OE has no affect on Y7/Y7, they are free running. When AVDD is grounded, the PLL is turned off and bypassed for test purposes.

When both clock inputs (CK, CK) are logic low, the device enters in a low power mode. An input logic detection circuit on the differential inputs, independent from input buffers, detects the logic low level and performs in a low power state where all outputs, the feedback, and the PLL are off. When the clock inputs transition from being logic low to being differential signals, the PLL turns back on, the inputs and the outputs are enabled, and the PLL obtains phase lock between the feedback clock pair (FBIN, FBIN) and the clock input pair (CK, CK) within the specified stabilization time.

The CDCUA877 is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from -40°C to 85°C).

产品特性

1.8-V/1.9-V Phase Lock Loop Clock Driver for Double Data Rate (DDR II) Applications
Spread Spectrum Clock Compatible
Operating Frequency: 125 MHz to 410 MHz
Application Frequency: 160 MHz to 410 MHz
Low Current Consumption: <200 mA Typ
Low Jitter (Cycle-Cycle): ±40 ps
Low Output Skew: 35 ps
Stabilization Time <6 µs
Distributes One Differential Clock Input to Ten Differential Outputs
52-Ball µBGA (MicroStar Junior™ BGA, 0,65-mm pitch)
External Feedback Pins (FBIN, FBIN) are Used to Synchronize the Outputs to theInput Clockst
Meets or Exceeds CUA877/CAU878 Specification PLL Standard for PC2-3200/4300/5300/6400o
Fail-Safe Inputs

MicroStar Junior is a trademark of Texas Instruments.

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