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MC88915TFN133R2 PDF预览

MC88915TFN133R2

更新时间: 2024-11-09 14:43:27
品牌 Logo 应用领域
摩托罗拉 - MOTOROLA 驱动逻辑集成电路
页数 文件大小 规格书
21页 228K
描述
PLL Based Clock Driver, 88915 Series, 7 True Output(s), 1 Inverted Output(s), CMOS, PQCC28, PLASTIC, LCC-28

MC88915TFN133R2 技术参数

生命周期:Transferred包装说明:QCCJ,
Reach Compliance Code:unknownHTS代码:8542.39.00.01
风险等级:5.61其他特性:MULTIPLE SELECTABLE FREQUENCY RELATIONS FOR THE CLOCK O/PS; O/P FREQUENCY RATIOS ARE 0.5F/1.0F/2.0F
系列:88915输入调节:MUX
JESD-30 代码:S-PQCC-J28长度:11.505 mm
逻辑集成电路类型:PLL BASED CLOCK DRIVER功能数量:1
反相输出次数:1端子数量:28
实输出次数:7最高工作温度:85 °C
最低工作温度:-40 °C输出特性:3-STATE
封装主体材料:PLASTIC/EPOXY封装代码:QCCJ
封装形状:SQUARE封装形式:CHIP CARRIER
认证状态:Not QualifiedSame Edge Skew-Max(tskwd):0.75 ns
座面最大高度:4.57 mm最大供电电压 (Vsup):5.25 V
最小供电电压 (Vsup):4.75 V标称供电电压 (Vsup):5 V
表面贴装:YES技术:CMOS
温度等级:INDUSTRIAL端子形式:J BEND
端子节距:1.27 mm端子位置:QUAD
宽度:11.505 mm最小 fmax:133 MHz
Base Number Matches:1

MC88915TFN133R2 数据手册

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M OT O R OL A  
SEMICONDUCTOR TECHNICAL DATA  
Order Number: MC88915T/D  
Rev 5, 08/2001  
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55, 70, 100, 133 and 160MHz Versions  
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The MC88915T Clock Driver utilizes phase–locked loop technology to  
lock its low skew outputs’ frequency and phase onto an input reference  
clock. It is designed to provide clock distribution for high performance PC’s  
and workstations. For a 3.3V version, see the MC88LV915T data sheet.  
The PLL allows the high current, low skew outputs to lock onto a single  
clock input and distribute it with essentially zero delay to multiple  
components on a board. The PLL also allows the MC88915T to multiply a  
low frequency input clock and distribute it locally at a higher (2X) system  
frequency. Multiple 88915’s can lock onto a single reference clock, which is  
ideal for applications when a central system clock must be distributed  
synchronously to multiple boards (see Figure 7).  
LOW SKEW CMOS  
PLL CLOCK DRIVER  
Five “Q” outputs (Q0–Q4) are provided with less than 500 ps skew between their rising edges. The Q5 output is inverted (180°  
phase shift) from the “Q” outputs. The 2X_Q output runs at twice the “Q” output frequency, while the Q/2 runs at 1/2 the “Q”  
frequency.  
The VCO is designed to run optimally between 20 MHz and the 2X_Q Fmax specification. The wiring diagrams in Figure 5 detail  
the different feedback configurations which create specific input/output frequency relationships. Possible frequency ratios of the  
“Q” outputs to the SYNC input are 2:1, 1:1, and 1:2.  
The FREQ_SEL pin provides one bit programmable divide–by in the feedback path of the PLL. It selects between divide–by–1  
and divide–by–2 of the VCO before its signal reaches the internal clock distribution section of the chip (see the block diagram on  
page 2). In most applications FREQ_SEL should be held high (÷1). If a low frequency reference clock input is used, holding  
FREQ_SEL low (÷2) will allow the VCO to run in its optimal range (>20MHz and >40MHz for the TFN133 version).  
In normal phase–locked operation the PLL_EN pin is held high. Pulling the PLL_EN pin low disables the VCO and puts the  
88915 in a static “test mode”. In this mode there is no frequency limitation on the input clock, which is necessary for a low frequency  
board test environment. The second SYNC input can be used as a test clock input to further simplify board–level testing (see  
detailed description on page 11).  
Pulling the OE/RST pin low puts the clock outputs 2X_Q, Q0–Q4, Q5 and Q/2 into a high impedance state (3–state). After the  
OE/RST pin goes back high Q0–Q4, Q5 and Q/2 will be reset in the low state, with 2X_Q being the inverse of the selected SYNC  
input. Assuming PLL_EN is low, the outputs will remain reset until the 88915 sees a SYNC input pulse.  
A lock indicator output (LOCK) will go high when the loop is in steady–state phase and frequency lock. The LOCK output will go  
low if phase–lock is lost or when the PLL_EN pin is low. The LOCK output will go high no later than 10ms after the 88915 sees a  
SYNC signal and full 5V VCC  
.
Features  
Five Outputs (Q0–Q4) with Output–Output Skew < 500 ps each being phase and frequency locked to the SYNC input  
The phase variation from part–to–part between the SYNC and FEEDBACK inputs is less than 550 ps (derived from the tPD  
specification, which defines the part–to–part skew)  
Input/Output phase–locked frequency ratios of 1:2, 1:1, and 2:1 are available  
Input frequency range from 5MHz – 2X_Q FMAX spec. (10MHz – 2X_Q FMAX for the TFN133 version)  
Additional outputs available at 2X and +2 the system “Q” frequency. Also a Q (180° phase shift) output available  
All outputs have ±36 mA drive (equal high and low) at CMOS levels, and can drive either CMOS or TTL inputs. All inputs are  
TTL–level compatible. ±88mA IOL/IOH specifications guarantee 50transmission line switching on the incident edge  
Test Mode pin (PLL_EN) provided for low frequency testing. Two selectable CLOCK inputs for test or redundancy purposes.  
All outputs can go into high impedance (3–state) for board test purposes  
Lock Indicator (LOCK) accuracy indicates a phase–locked state  
Yield Surface Modeling and YSM are trademarks of Motorola, Inc.  
Motorola, Inc. 2001  
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