MPC9446 Motorola, MPC9446 Datasheet

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MPC9446

Manufacturer Part Number
MPC9446
Description
2.5V and 3.3V LVCMOS Clock Fanout Buffer
Manufacturer
Motorola
Datasheet

Specifications of MPC9446

Case
QFP

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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
2.5V and 3.3V LVCMOS Clock
Fanout Buffer
buffer designed for low-voltage mid-range to high-performance telecom,
networking and computing applications. Both 3.3V, 2.5V and dual supply
voltages are supported for mixed-voltage applications. The MPC9446
offers 10 low-skew outputs and 2 selectable inputs for clock redundancy.
The outputs are configurable and support 1:1 and 1:2 output to input
frequency ratios. The MPC9446 is specified for the extended temperature
range of --40°C to 85°C.
Features
Functional Description
frequencies up to 250 MHz. The signals are generated and retimed
on-chip to ensure minimal skew between the three output banks. Two
independent LVCMOS compatible clock inputs are available. This feature
supports redundant clock sources or the addition of a test clock into the
system design. Each of the three output banks can be individually
supplied by 2.5V or 3.3V supporting mixed voltage applications. The
FSELx pins choose between division of the input reference frequency by
one or two. The frequency divider can be set individually for each of the
three output banks. The MPC9446 can be reset and the outputs are
disabled by deasserting the MR/OE pin (logic high state). Asserting
MR/OE will enable the outputs.
50 Ω transmission lines. Please consult the MPC9456 specification for a 1:10 mixed voltage buffer with LVPECL compatible
inputs. For series terminated transmission lines, each of the MPC9446 outputs can drive one or two traces giving the devices an
effective fanout of 1:20. The device is packaged in a 7x7 mm
©
Configurable 10 outputs LVCMOS clock distribution buffer
Compatible to single, dual and mixed 3.3V/2.5V voltage supply
Wide range output clock frequency up to 250 MHz
Designed for mid-range to high-performance telecom, networking and
computer applications
Supports applications requiring clock redundancy
Max. output skew of 200 ps (150 ps within one bank)
Selectable output configurations per output bank
Tristable outputs
32 ld LQFP package
Ambient operating temperature range of --40 to 85°C
The MPC9446 is a 2.5V and 3.3V compatible 1:10 clock distribution
The MPC9446 is a full static fanout buffer design supporting clock
All inputs accept LVCMOS signals while the outputs provide LVCMOS compatible levels with the capability to drive terminated
Motorola, Inc. 2002
Freescale Semiconductor, Inc.
For More Information On This Product,
1
Go to: www.freescale.com
2
32-lead LQFP package.
DUAL SUPPLY 2.5V AND 3.3V
LOW VOLTAGE SINGLE OR
DISTRIBUTION BUFFER
LVCMOS CLOCK
MPC9446
LQFP PACKAGE
CASE 873A
FA SUFFIX
Order Number: MPC9446/D
Rev 1, 03/2002

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MPC9446 Summary of contents

Page 1

... Please consult the MPC9456 specification for a 1:10 mixed voltage buffer with LVPECL compatible inputs. For series terminated transmission lines, each of the MPC9446 outputs can drive one or two traces giving the devices an effective fanout of 1:20. The device is packaged in a 7x7 mm © ...

Page 2

... GND QA1 VCCA QA0 GND MR/OE Figure 2. Pinout: 32- -Lead Package Pinout (Top View) MOTOROLA V CC 25k 0 0 CLK V CC 25k CLK ÷ 25k 25k 1 25k 25k 25k Figure 1. MPC9446 Logic Diagram MPC9446 For More Information On This Product, Go to: www.freescale.com Bank A QA0 ...

Page 3

... QA0:2 REF QB0:2 REF QC0:3 REF Outputs enabled a Min -0.3 -0.3 -0.3 -65 Min V CC 200 2000 200 3 For More Information On This Product, Go to: www.freescale.com MPC9446 Function GND CCC 3.3V 0V 3. internally connected to V CCB 1 CCLK1 ÷ 2 QA0:2 REF ÷ 2 QB0:2 ...

Page 4

... AC characteristics apply for parallal output termination of 50Ω The MPC9446 is functional input and output clock frequency of 350 MHz and is characterized up to 250 MHz. c. Violation of the 1.0 ns maximum input rise and fall time limit will affect the device propagation delay, device-to-device skew, reference input pulse width, output duty cycle and maximum frequency specifications ...

Page 5

... AC specifications are design targets, final specification is pending device characterization. c. The MPC9446 is functional input and output clock frequency of 350 MHz and is characterized up to 250 MHz. d. Violation of the 1.0 ns maximum input rise and fall time limit will affect the device propagation delay, device-to-device skew, reference input pulse width, output duty cycle and maximum frequency specifications ...

Page 6

... This suggests that the dual line driving need not be used exclusively to maintain the tight output-to-output skew of the MPC9446. The output waveform in Figure 4. “Single versus Dual Line Termination Waveforms” shows a step in the waveform, this step is caused by the impedance mismatch seen looking into the driver. The parallel combination of the 36Ω ...

Page 7

... Freescale Semiconductor, Inc. Pulse Generator Z = 50Ω Figure 6. CCLK0,1 MPC9446 AC test reference for Figure 7. Output Transition Time Test Reference t SK(LH) The pin- - to- - pin skew is defined as the worst case difference in propagation delay between any two similar delay paths within a single device Figure 9. Output- -to- -output Skew t ...

Page 8

... Freescale Semiconductor, Inc. MPC9446 DETAIL AB- - SEATING - - AC- - PLANE 0.10 (0.004 DETAIL AD MOTOROLA OUTLINE DIMENSIONS FA SUFFIX LQFP PACKAGE CASE 873A-02 ISSUE A 4X 0.20 (0.008 0.20 (0.008 DETAIL AD BASE METAL SECTION AE For More Information On This Product, Go to: www.freescale.com DETAIL Y NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14 ...

Page 9

... Freescale Semiconductor, Inc. TIMING SOLUTIONS NOTES 9 For More Information On This Product, Go to: www.freescale.com MPC9446 MOTOROLA ...

Page 10

... Freescale Semiconductor, Inc. MPC9446 MOTOROLA NOTES 10 For More Information On This Product, Go to: www.freescale.com TIMING SOLUTIONS ...

Page 11

... Freescale Semiconductor, Inc. TIMING SOLUTIONS NOTES 11 For More Information On This Product, Go to: www.freescale.com MPC9446 MOTOROLA ...

Page 12

... ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. 852--26668334 Technical Information Center: 1- -800- -521- -6274 HOME PAGE: http://www.motorola.com/semiconductors/ MOTOROLA ◊ 12 For More Information On This Product, Go to: www.freescale.com MPC9446/D TIMING SOLUTIONS ...

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