MPC9653A Motorola, MPC9653A Datasheet

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MPC9653A

Manufacturer Part Number
MPC9653A
Description
Manufacturer
Motorola
Datasheet

Specifications of MPC9653A

Case
QFP

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REV 2
© Motorola, Inc. 2004
3.3 V 1:8 LVCMOS PLL Clock
Generator
and zero-delay buffer targeted for high performance low-skew clock distri-
bution in mid-range to high-performance telecom, networking and comput-
ing applications. With output frequencies up to 125 MHz and output skews
less than 150 ps the device meets the needs of the most demanding clock
applications.
Features
• 1:8 PLL based low-voltage clock generator
• Supports zero-delay operation
• 3.3 V power supply
• Generates clock signals up to 125 MHz
• PLL guaranteed to lock down to 145 MHz, output frequency = 36.25 MHz
• Maximum output skew of 150 ps
• Differential LVPECL reference clock input
• External PLL feedback
• Drives up to 16 clock lines
• 32-lead LQFP packaging
• 32-lead Pb-free package available
• Ambient temperature range 0°C to +70°C
• Pin and function compatible to the MPC953 and MPC9653
Functional Description
onto an input reference clock. Normal operation of the MPC9653A requires
the connection of the QFB output to the feedback input to close the PLL
feedback path (external feedback). With the PLL locked, the output
frequency is equal to the reference frequency of the device and VCO_SEL
selects the operating frequency range of 25 to 62.5 MHz or 50 to 125 MHz.
The two available post-PLL dividers selected by VCO_SEL (divide-by-4 or
divide-by-8) and the reference clock frequency determine the VCO frequency. Both must be selected to match the VCO frequency
range. The internal VCO of the MPC9653A is running at either 4x or 8x of the reference clock frequency. The MPC9653A is
guaranteed to lock in a low power PLL mode in the high frequency range (VCO_SEL = 0) down to PLL = 145 MHz or F
zero delay, low skew fanout buffer. The device performance has been tuned and optimized for zero delay performance.
input reference clock is bypassing the PLL and routed either to the output dividers or directly to the outputs. The PLL bypass
configurations are fully static and the minimum clock frequency specification and all other PLL characteristics do not apply. The
outputs can be disabled (high-impedance) and the device reset by asserting the MR/OE pin. Asserting MR/OE also causes the PLL
to loose lock due to missing feedback signal presence at FB_IN. Deasserting MR/OE will enable the outputs and close the phase
locked loop, enabling the PLL to recover to normal operation.
LVCMOS signals while the outputs provide LVCMOS compatible levels with the capability to drive terminated 50 Ω transmission lines.
For series terminated transmission lines, each of the MPC9653A outputs can drive one or two traces giving the devices an effective
fanout of 1:16. The device is packaged in a 7x7 mm
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
The MPC9653A is a 3.3 V compatible, 1:8 PLL based clock generator
The MPC9653A utilizes PLL technology to frequency lock its outputs
The MPC9653A has a differential LVPECL reference input along with an external feedback input. The device is ideal for use as a
The PLL_EN and BYPASS controls select the PLL bypass configuration for test and diagnosis. In this configuration, the selected
The MPC9653A is fully 3.3 V compatible and requires no external loop filter components. The inputs (except PCLK) accept
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
2
32-lead LQFP package.
PLL CLOCK GENERATOR
32 LEAD LQFP PACKAGE-Pb-free
3.3 V LVCMOS 1:8
32 LEAD LQFP PACKAGE
MPC9653A
LOW VOLTAGE
AC SUFFIX
CASE 873A
CASE 873A
FA SUFFIX
Order this document
by MPC9653A/D
ref
= 36.25 MHz.

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MPC9653A Summary of contents

Page 1

... VCO frequency. Both must be selected to match the VCO frequency range. The internal VCO of the MPC9653A is running at either the reference clock frequency. The MPC9653A is guaranteed to lock in a low power PLL mode in the high frequency range (VCO_SEL = 0) down to PLL = 145 MHz or F The MPC9653A has a differential LVPECL reference input along with an external feedback input ...

Page 2

... CC 3⋅25k PLL_EN VCO_SEL BYPASS MR/OE 25k GND Q0 VCC QFB GND PLL_EN BYPASS VCO_SEL Figure 2. MPC9653A 32-Lead Package Pinout (Top View) 2 Freescale Semiconductor, Inc. ÷ Ref 1 1 ÷2 VCO PLL* 200-500 MHz FB * PLL will lock @ 145 MHz Figure 1. MPC9653A Logic Diagram ...

Page 3

... Default PLL_EN Test mode with PLL bypassed. The reference clock (PCLK substituted for the internal VCO output. MPC9653A is fully static and no minimum frequency limit applies. All PLL related AC characteristics are not applicable. BYPASS Test mode with PLL and output dividers bypassed. The 1 reference clock (PCLK) is directly routed to the outputs ...

Page 4

... V (DC) specification. PP The MPC9653A is capable of driving 50 Ω transmission lines on the incident edge. Each output drives one 50 Ω parallel terminated transmission b. . Alternatively, the device drives up to two 50 Ω series terminated transmission lines. The MPC9653A meets line to a termination voltage of V ...

Page 5

... PLL feedback (high frequency range) requires VCO_SEL=0, PLL_EN=1, b. ÷8 PLL feedback (low frequency range) requires VCO_SEL=1, PLL_EN= bypass mode, the MPC9653A divides the input reference clock. e. The input frequency f must match the VCO frequency range divided by the feedback divider ratio FB: f REF f ...

Page 6

... CMOS fanout buffers. The external feedback option of the MPC9653A clock driver allows for its use as a zero delay buffer. The PLL aligns the feedback clock output edge with the clock input reference edge resulting a near zero delay through the de- ...

Page 7

... Figure 6, “Single versus Dual Transmission Lines”, illustrates an output driving a single series terminated line versus two series terminated lines in parallel. When taken to its extreme the fanout of the MPC9653A clock driver is effectively doubled due to its capability to drive multiple lines. ...

Page 8

... Termination Waveforms”, show the simulation results of an out- put driving a single line versus two lines. In both cases the drive capability of the MPC9653A output buffer is more than sufficient to drive 50 Ω transmission lines on the incident edge. Note from the delay measurements in the simulations a delta of only 43ps exists between the two differently loaded outputs ...

Page 9

... PCLK ÷ GND FB_IN x 100% 0 The deviation in t random sample of cycles = | N+1 The deviation in cycle time of a signal with respect to the ideal period over a random sample of cycles = 3 2.4 0.55 Go to: www.freescale.com MPC9653A 0 CMR GND t (PD) , static phase offset) (PD) test reference mean| JIT(∅ ...

Page 10

... MPC9653A/D D1 D1/2 PIN 1 INDEX E1 DETAIL D 0. 28X SEATING PLANE C DETAIL AD 8X (θ1˚ ( (L1) DETAIL AD 10 Freescale Semiconductor, Inc. OUTLINE DIMENSIONS 4X 0. 32X 0.1 C BASE PLATING METAL 0. SECTION F 0.25 GAUGE PLANE θ˚ FA SUFFIX CASE 873A-03 ISSUE B LQFP PACKAGE ...

Page 11

... Freescale Semiconductor, Inc. TIMING SOLUTIONS For More Information On This Product, NOTES Go to: www.freescale.com MPC9653A/D 11 ...

Page 12

... JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong For More Information On This Product, Go to: www.freescale.com 3-20-1 Minami-Azabu. Minato-ku, Tokyo 106-8573, Japan 81-3-3440-3569 852-26668334 HOME PAGE: http://motorola.com/semiconductors MPC9653A/D ...

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