MPC9456 Freescale Semiconductor, MPC9456 Datasheet

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MPC9456

Manufacturer Part Number
MPC9456
Description
2.5V AND 3.3V LVCMOS CLOCK FANOUT BUFFER
Manufacturer
Freescale Semiconductor
Datasheet

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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 MPC9456
offers 10 low-skew outputs and a differential LVPECL clock input. The
outputs are configurable and support 1:1 and 1:2 output to input
frequency ratios. The MPC9456 is specified for the extended temperature
range of –40 to 85 C.
Features
Functional Description
250 MHz. The signals are generated and retimed on-chip to ensure
minimal skew between the three output banks.
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 MPC9456 can be reset and the outputs are disabled by deasserting the MR/OE pin (logic
high state). Asserting MR/OE will enable the outputs.
terminated 50
Please consult the MPC9446 specification for a full CMOS compatible device. For series terminated transmission lines, each of
the MPC9456 outputs can drive one or two traces giving the devices an effective fanout of 1:20. The device is packaged in a 7x7
mm 2 32-lead LQFP package.
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 high-performance differential clocking applications
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 MPC9456 is a 2.5V and 3.3V compatible 1:10 clock distribution
The MPC9456 is a full static design supporting clock frequencies up to
Each of the three output banks can be individually supplied by 2.5V or 3.3V supporting mixed voltage applications. The FSELx
All control inputs accept LVCMOS signals while the outputs provide LVCMOS compatible levels with the capability to drive
Motorola, Inc. 2002
transmission lines. The clock input is low voltage PECL compatible for differential clock distribution support.
Freescale Semiconductor, Inc.
For More Information On This Product,
1
Go to: www.freescale.com
DUAL SUPPLY 2.5V AND 3.3V
LOW VOLTAGE SINGLE OR
DISTRIBUTION BUFFER
LVCMOS CLOCK
MPC9456
LQFP PACKAGE
CASE 873A–02
FA SUFFIX
Order Number: MPC9456/D
Rev 1, 03/2002

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MPC9456 Summary of contents

Page 1

... The clock input is low voltage PECL compatible for differential clock distribution support. Please consult the MPC9446 specification for a full CMOS compatible device. For series terminated transmission lines, each of the MPC9456 outputs can drive one or two traces giving the devices an effective fanout of 1:20. The device is packaged in a 7x7 mm 2 32-lead LQFP package. ...

Page 2

... MPC9456 PCLK PCLK www.DataSheet4U.com FSELA FSELB FSELC MR/OE MOTOROLA Freescale Semiconductor, Inc. CLK 25k CLK 25k 25k 25k 25k 25k Figure 1. MPC9456 Logic Diagram VCCA 26 QA2 27 GND 28 QA1 MPC9456 29 VCCA 30 QA0 31 GND 32 MR/ Figure 2. Pinout: 32–Lead Package Pinout (Top View) ...

Page 3

... QA0 REF 2 f QB0 REF 2 f QC0 REF 2 Internal reset Outputs disabled (tristate) Min Max Unit -0.3 4 +0 -40 125 C Typ Max Unit 4.0 pF MPC9456 GND Condition Condition Per output MOTOROLA ...

Page 4

... AC characteristics apply for parallel output termination The MPC9456 is functional input and output clock frequency of 350 MHz and is characterized up to 250 MHz CMR (AC) is the crosspoint of the differential input signal. Normal AC operation is obtained when the crosspoint is within the V CMR range and the input swing lies within the V PP (AC) specification ...

Page 5

... AC characteristics apply for parallel output termination The MPC9456 is functional input and output clock frequency of 350 MHz and is characterized up to 250 MHz CMR (AC) is the crosspoint of the differential input signal. Normal AC operation is obtained when the crosspoint is within the V CMR range and the input swing lies within the V PP (AC) specification ...

Page 6

... MPC9456 Table 10: AC Characteristics ( 3. – Symbol t sk(O) Output-to-output Skew Any output bank, same output divider t sk(PP) Device-to-device Skew t PLH,HL Propagation delay Output pulse skew c t SK( Output Duty Cycle a. AC characteristics apply for parallel output termination ...

Page 7

... This suggests that the dual line driving need not be used exclusively to maintain the tight output-to-output skew of the MPC9456. 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 ...

Page 8

... MPC9456 Differential Pulse Generator Figure 6. PCLK MPC9456 AC test reference for 3.3V and 2.5V www.DataSheet4U.com t F Figure 7. Output Transition Time Test Reference The time from the PLL controlled edge to the non controlled edge, divided by the time between PLL controlled edges, expressed as a percentage Figure 9 ...

Page 9

... R 0.150 0.250 0.006 S 9.000 BSC 0.354 BSC S1 4.500 BSC 0.177 BSC V 9.000 BSC 0.354 BSC V1 4.500 BSC 0.177 BSC W 0.200 REF 0.008 REF X 1.000 REF 0.039 REF MPC9456 MAX 0.063 0.018 0.057 0.016 0.006 0.008 0.028 0.006 _ 5 0.010 MOTOROLA ...

Page 10

... MPC9456 www.DataSheet4U.com MOTOROLA Freescale Semiconductor, Inc. NOTES For More Information On This Product to: www.freescale.com TIMING SOLUTIONS ...

Page 11

... TIMING SOLUTIONS Freescale Semiconductor, Inc. NOTES For More Information On This Product to: www.freescale.com MPC9456 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 Freescale Semiconductor, Inc. For More Information On This Product to: www.freescale.com MPC9456/D TIMING SOLUTIONS ...

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