제품 상세 정보

Function Memory interface Additive RMS jitter (typ) (fs) 30 Output frequency (max) (MHz) 340 Number of outputs 10 Output supply voltage (V) 1.8 Core supply voltage (V) 1.8 Output skew (ps) 35 Features DDR2 PLL Operating temperature range (°C) -40 to 85 Rating Catalog Output type LVCMOS Input type LVCMOS
Function Memory interface Additive RMS jitter (typ) (fs) 30 Output frequency (max) (MHz) 340 Number of outputs 10 Output supply voltage (V) 1.8 Core supply voltage (V) 1.8 Output skew (ps) 35 Features DDR2 PLL Operating temperature range (°C) -40 to 85 Rating Catalog Output type LVCMOS Input type LVCMOS
NFBGA (NMK) 52 31.5 mm² 7 x 4.5 VQFN (RHA) 40 36 mm² 6 x 6
  • 1.8-V Phase Lock Loop Clock Driver for Double Data Rate (DDR II) Applications
  • Spread Spectrum Clock Compatible
  • Operating Frequency: 10 MHz to 400 MHz
  • Low Current Consumption: <135 mA
  • Low Jitter (Cycle-Cycle): ±30 ps
  • Low Output Skew: 35 ps
  • Low Period Jitter: ±20 ps
  • Low Dynamic Phase Offset: ±15 ps
  • Low Static Phase Offset: ±50 ps
  • Distributes One Differential Clock Input to Ten Differential Outputs
  • 52-Ball µBGA (MicroStar™ Junior BGA, 0,65-mm pitch) and 40-Pin MLF
  • External Feedback Pins (FBIN, FBIN) are Used to Synchronize the Outputs to the Input Clocks
  • Meets or Exceeds JESD82-8 PLL Standard for PC2-3200/4300
  • Fail-Safe Inputs

MicroStar is a trademark of Texas Instruments.

  • 1.8-V Phase Lock Loop Clock Driver for Double Data Rate (DDR II) Applications
  • Spread Spectrum Clock Compatible
  • Operating Frequency: 10 MHz to 400 MHz
  • Low Current Consumption: <135 mA
  • Low Jitter (Cycle-Cycle): ±30 ps
  • Low Output Skew: 35 ps
  • Low Period Jitter: ±20 ps
  • Low Dynamic Phase Offset: ±15 ps
  • Low Static Phase Offset: ±50 ps
  • Distributes One Differential Clock Input to Ten Differential Outputs
  • 52-Ball µBGA (MicroStar™ Junior BGA, 0,65-mm pitch) and 40-Pin MLF
  • External Feedback Pins (FBIN, FBIN) are Used to Synchronize the Outputs to the Input Clocks
  • Meets or Exceeds JESD82-8 PLL Standard for PC2-3200/4300
  • Fail-Safe Inputs

MicroStar is a trademark of Texas Instruments.

The CDCU877 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 CDCU877 is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from -40°C to 85°C.

The CDCU877 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 CDCU877 is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from -40°C to 85°C.

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기술 자료

star =TI에서 선정한 이 제품의 인기 문서
검색된 결과가 없습니다. 검색어를 지우고 다시 시도하십시오.
4개 모두 보기
유형 직함 날짜
* Data sheet 1.8V Phase Lock Loop Clock Driver datasheet (Rev. D) 2007/07/05
* User guide CTS MicroStar BGA Discontinued and Redesigned 2022/05/08
Application note DDR2 Memory Interface Clocks and Registers - Overview 2009/03/25
Application note Application Examples for CDCUx877x PLL family 2008/05/07

설계 및 개발

추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.

시뮬레이션 모델

CDCU877 IBIS Model (Rev. A)

SCAC049A.ZIP (17 KB) - IBIS Model
시뮬레이션 모델

CDCU877A IBIS Model (Rev. A)

SCAC050A.ZIP (17 KB) - IBIS Model
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NFBGA (NMK) 52 Ultra Librarian
VQFN (RHA) 40 Ultra Librarian

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  • REACH
  • 디바이스 마킹
  • 납 마감/볼 재질
  • MSL 등급/피크 리플로우
  • MTBF/FIT 예측
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  • 인증 요약
  • 지속적인 신뢰성 모니터링
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