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| 型号： | MPC974FAR2 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 974 SERIES, PLL BASED CLOCK DRIVER, 14 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP52 |
| 封装： | PLASTIC, LQFP-52 |
| 文件页数： | 1/6页 |
| 文件大小： | 294K |
| 代理商： | MPC974FAR2 |
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MPC974/D
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
210
3.3V PLL Clock Driver
The MPC974 is a fully integrated PLL based clock generator and clock
distribution chip which operates from a 3.3V supply. The MPC974 is ideal-
ly suited for high speed, timing critical designs which need a high level of
clock fanout. The device features 15 high drive LVCMOS outputs, each
output has the capability of driving a 50
parallel terminated transmission
line or two 50
series terminated transmission lines on the incident edge.
Fully Integrated PLL
Two Reference Clock Inputs for Redundant Clock Applications
High Impedance Output Control
Logic Enable on the Outputs
3.3V VCC Supply
Output Frequency Configurable
LQFP Packaging
±100ps Typical Cycle–to–Cycle Jitter
The MPC974 features 3 independent frequency programmable banks
of outputs. The frequency programmability offers the capability of estab-
lishing output frequency relationships of 1:1, 2:1, 3:1, 3:2 and 3:2:1. In
addition, the device features a separate feedback output which allows for
a wide variety of input/output frequency multiplication alternatives. The
VCO_Sel pin provides an extended VCO lock range for added flexibility
and general purpose usage.
The TCLK0 and TCLK1 inputs provide a method for dynamically
switching the PLL between two different clock sources. The PLL has been
optimized to provide small deviations in output pulse width and well con-
trolled, slow transition back to lock when the inputs are switched between
two references that are equal in frequency but out of phase with each
other. This feature makes the MPC974 a solution for fault tolerant applica-
tions which require redundant clock sources.
For designs in which fault tolerance is critical, other products may provide more control over the clock switch functions. For
these features please refer to the MPC993 datasheet.
All of the control pins are LVTTL/LVCMOS level inputs. The Fsel pins control the VCO divide ratios that are applied to the
various output banks and the feedback output. The MR input will reset the internal flip flops and place the outputs in high
impedance when driven LOW. The OE pin will force all of the outputs except the feedback output LOW to allow for acquiring
phase lock prior to providing clocks to the rest of the system. Note that the OE pin is not synchronized to the internal clock. As a
result, the initial pulse after de–assertion of the OE pin may be distorted. The PLL_En pin allows the PLL to be bypassed for
board level functional test. When bypassed the signal on the selected TCLK will be routed around the PLL and will drive the
internal dividers directly.
The MPC974 is packaged in the 52–lead LQFP package to provide optimum electrical performance as well as minimize board
space requirements. The device is specified for 3.3V VCC.
Rev 3
2
MPC974
LOW VOLTAGE
PLL CLOCK DRIVER
FA SUFFIX
52–LEAD LQFP PACKAGE
CASE 848D-03
See Upgrade Product – MPC9774
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC9772 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:3.3V 1:12 LVCMOS PLL Clock Generator |
| MPC9772AE | 功能描述:锁相环 - PLL 2.5 3.3V 250MHz Clock Generator RoHS:否 制造商:Silicon Labs 类型:PLL Clock Multiplier 电路数量:1 最大输入频率:710 MHz 最小输入频率:0.002 MHz 输出频率范围:0.002 MHz to 808 MHz 电源电压-最大:3.63 V 电源电压-最小:1.71 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:QFN-36 封装:Tray |
| MPC9772AER2 | 功能描述:时钟发生器及支持产品 FSL 1-12 LVCMOS PLL Clock Generator, xta RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MPC9772FA | 功能描述:锁相环 - PLL 3.3V 240MHz Clock Generator RoHS:否 制造商:Silicon Labs 类型:PLL Clock Multiplier 电路数量:1 最大输入频率:710 MHz 最小输入频率:0.002 MHz 输出频率范围:0.002 MHz to 808 MHz 电源电压-最大:3.63 V 电源电压-最小:1.71 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:QFN-36 封装:Tray |
| MPC9772FAR2 | 功能描述:时钟发生器及支持产品 FSL 1-12 LVCMOS PLL Clock Generator, xta RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
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