MPC952 Freescale Semiconductor, Inc, MPC952 Datasheet

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MPC952

Manufacturer Part Number
MPC952
Description
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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Low Voltage PLL Clock Driver
targeted for high performance clock tree applications. The device
features a fully integrated PLL with no external components required.
With output frequencies of up to 180MHz and eleven low skew outputs
the MPC952 is well suited for high performance designs. The device
employs a fully differential PLL design to optimize jitter and noise
rejection performance. Jitter is an increasingly important parameter as
more microprocessors and ASiC’s are employing on chip PLL clock
distribution.
The banks contain 5 outputs, 4 outputs and 2 outputs. The internal divide
circuitry allows for output frequency ratios of 1:1, 2:1, 3:1 and 3:2:1. The
output frequency relationship is controlled by the fsel frequency control
pins. The fsel pins as well as the other inputs are LVCMOS/LVTTL
compatible inputs.
for the use of the device as a “zero delay” buffer. Any of the eleven
outputs can be used as the feedback to the PLL. The VCO_Sel pin allows for the choice of two VCO ranges to optimize PLL
stability and jitter performance. The MR/OE pin allows the user to force the outputs into high impedance for board level test.
signal on the RefClk input around the PLL directly to the internal dividers. Because the signal is routed through the dividers, it
may take several transitions of the RefClk to affect a transition on the outputs. This features allows a designer to single step the
design for debug purposes.
For applications using series terminated transmission lines each MPC952 output can drive two lines. This capability provides an
effective fanout of 22, more than enough clocks for most clock tree designs. For more information on driving transmission lines
consult the applications section of this data sheet.
PowerPC is a trademark of International Business Machines Corporation. Pentium is a trademark of Intel Corporation.
2/98
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Motorola, Inc. 1998
Fully Integrated PLL
Output Frequency up to 180MHz
High Impedance Disabled Outputs
Compatible with PowerPC , Intel and High Performance RISC
Microprocessors
Output Frequency Configurable
TQFP Packaging
The MPC952 is a 3.3V compatible, PLL based clock driver device
The MPC952 features three banks of individually configurable outputs.
The MPC952 uses external feedback to the PLL. This features allows
For system debug the PLL of the MPC952 can be bypassed. When forced to a logic HIGH, the PLLEN input will route the
The outputs of the MPC952 are LVCMOS outputs. The outputs are optimally designed to drive terminated transmission lines.
100ps Cycle–to–Cycle Jitter
1
REV 3
PLL CLOCK DRIVER
LOW VOLTAGE
MPC952
TQFP PACKAGE
CASE 873A-02
FA SUFFIX

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MPC952 Summary of contents

Page 1

... The MR/OE pin allows the user to force the outputs into high impedance for board level test. For system debug the PLL of the MPC952 can be bypassed. When forced to a logic HIGH, the PLLEN input will route the signal on the RefClk input around the PLL directly to the internal dividers. Because the signal is routed through the dividers, it may take several transitions of the RefClk to affect a transition on the outputs ...

Page 2

... VCCO 25 Qb2 26 Qb3 27 GNDO 28 MPC952 GNDO 29 Qc0 30 Qc1 31 VCCO Figure 2. 32–Lead Pinout (Top View) MOTOROLA Figure 1. MPC952 Logic Diagram VCO 2 200–480MHz LPF FUNCTION TABLES fsela VCCO 15 Qa2 Control Pin 14 Qa1 VCO_Sel 13 GNDO MR/OE 12 Qa0 PLL_En ...

Page 3

... Maximum Quiescent Supply Current I CCA PLL Supply Current 1. The MPC952 outputs can drive series or parallel terminated 50Ω (or 50Ω /2) transmission lines on the incident edge (see Applications Info section). 2. Inputs have pull–up, pull–down resistors which affect input current. ...

Page 4

... VCC/2. This technique draws a fairly high level of DC current and thus only a single terminated line can be driven by each output of the MPC952 clock driver. For the series terminated case however there current draw, thus the outputs can drive multiple series terminated lines. ...

Page 5

... DC voltage drop that will be seen between the V CC supply and the VCCA pin of the MPC952. From the data sheet the I VCCA current (the current sourced through the VCCA pin) is typically 15mA (20mA maximum), assuming that a minimum of 3.0V must be maintained on the VCCA pin very little DC voltage drop can be tolerated when a 3 ...

Page 6

... MPC952 –T– DETAIL –Z– –AB– SEATING –AC– PLANE 0.10 (0.004 DETAIL AD MOTOROLA OUTLINE DIMENSIONS FA SUFFIX TQFP PACKAGE CASE 873A-02 ISSUE A 4X 0.20 (0.008) AB T–U Z –U– ...

Page 7

... Motorola, Inc. Motorola, Inc Equal Mfax is a trademark of Motorola, Inc. JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 141, 4–32–1 Nishi–Gotanda, Shagawa–ku, Tokyo, Japan. 03–5487–8488 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 7 MPC952 MPC952/D MOTOROLA ...

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