MPC9229ACR2 - Integrated Device Technology

DATA SHEET

400MHz Low Voltage PECL Clock Synthesizer MPC9229

The MPC9229 is a 3.3 V compatible, PLL based clock synthesizer targeted for high

performance clock generation in mid-range to high-performance telecom, networking and

computing applications. With output frequencies from 25 MHz to 400 MHz and the support of

differential PECL output signals the device meets the needs of the most demanding clock

applications.

Features

• 25 MHz to 400 MHz Synthesized Clock Output Signal

• Differential PECL Output

• LVCMOS Compatible Control Inputs

• On-Chip Crystal Oscillator for Reference Frequency Generation

• 3.3-V Power Supply

• Fully Integrated PLL

• Minimal Frequency Overshoot

• Serial 3-Wire Programming Interface

• Parallel Programming Interface for Power-Up

• 32-Lead LQFP and 28-Lead PLCC Packaging

• 32-Lead and 28-Lead Pb-Free Package Available

• SiGe Technology

• Ambient Temperature Range 0°C to +70°C

• Pin and Function Compatible to the MC12429

Functional Description

The internal crystal oscillator uses the external quartz crystal as the basis of its frequency

reference. The frequency of the internal crystal oscillator is divided by 16 and then multiplied

by the PLL. The VCO within the PLL operates over a range of 800 to 1600 MHz. Its output is

scaled by a divider that is configured by either the serial or parallel interfaces. The crystal

oscillator frequency fXTAL, the PLL feedback-divider M and the PLL post-divider N determine

the output frequency.

The feedback path of the PLL is internal. The PLL adjusts the VCO output frequency to be

4⋅M times the reference frequency by adjusting the VCO control voltage. Note that for some

values of M (either too high or too low) the PLL will not achieve phase lock. The PLL will be

stable if the VCO frequency is within the specified VCO frequency range (800 to 1600 MHz).

The M-value must be programmed by the serial or parallel interface.

The PLL post-divider N is configured through either the serial or the parallel interfaces, and

can provide one of four division ratios (1, 2, 4, or 8). This divider extends performance of the

part while providing a 50% duty cycle. The output driver is driven differentially from the output

divider, and is capable of driving a pair of transmission lines terminated 50 Ω to VCC –2.0 V. The positive supply voltage for the internal PLL

is separated from the power supply for the core logic and output drivers to minimize noise induced jitter.

The configuration logic has two sections: serial and parallel. The parallel interface uses the values at the M[8:0] and N[1:0] inputs to configure

the internal counters. It is recommended on system reset to hold the P_LOAD input LOW until power becomes valid. On the LOW-to-HIGH

transition of P_LOAD, the parallel inputs are captured. The parallel interface has priority over the serial interface. Internal pullup resistors are

provided on the M[8:0] and N[1:0] inputs prevent the LVCMOS compatible control inputs from floating.

The serial interface centers on a fourteen bit shift register. The shift register shifts once per rising edge of the S_CLOCK input. The serial

input S_DATA must meet setup and hold timing as specified in the AC Characteristics section of this document. The configuration latches will

capture the value of the shift register on the HIGH-to-LOW edge of the S_LOAD input. Refer to Programming Interface for more information.

The TEST output reflects various internal node values, and is controlled by the T[2:0] bits in the serial data stream. In order to minimize the

PLL jitter, it is recommended to avoid active signal on the TEST output.

MPC9229

400 MHz LOW VOLTAGE

CLOCK SYNTHESIZER

ORDERING INFORMATION

Device Temp.

Range

Case

No. Package

MPC9229FN 0°C

to +70°C

776-02 PLCC

MPC9229EI 776-02 PLCC

MPC9229FA 873A-03 LQFP

MPC9229AC 873A-03 LQFP

FA SUFFIX

32-LEAD LQFP PACKAGE

CASE 873A-04

AC SUFFIX

32-LEAD LQFP PACKAGE

Pb-FREE PACKAGE

CASE 873A-04

EI SUFFIX

28-LEAD PLCC PACKAGE

Pb-FREE PACKAGE

CASE 776-02

FN SUFFIX

28-LEAD PLCC PACKAGE

CASE 776-02

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

Figure 1. MPC9229 Logic Diagram

÷1

÷2

÷4

÷8

XTAL_IN

XTAL_OUT

S_LOAD

÷16

S_DATA

S_CLOCK

M[0:8]

XTAL

PLL

Ref

VCO

800 – 1800 MHz

÷0 TO ÷511

9-BIT M-DIVIDER

M-LATCH N-LATCH

10 – 20 MHz

T-LATCH

TEST

01 01

BITS 5-13 BITS 3-4 BITS 0-2

14-BIT SHIFT REGISTER

SYNC

N[1:0]

P/S

fOUT

TEST

VCC

÷4

P_LOAD

fOUT

25 24 23 22 21 20 19

111097865

VCC

XTAL_OUT

P_LOAD

M[0]

M[1]

M[2]

M[3]

fOUT

GND

VCC

TEST

GND

S_CLOCK N[1]

N[0]

M[8]

M[7]

M[6]

M[5]

M[4]

S_DATA

S_LOAD

VCC_PLL

XTAL_IN

MPC9229

Figure 2. MPC9229 28-Lead PLCC Pinout

(Top View)

Figure 3. MPC9229 32-Lead LQFP Pinout

(Top View)

GND

TEST

VCC

GND

fOUT

M[3]

M[2]

M[1]

M[0]

P_LOAD

N[1]

N[0]

M[8]

M[7]

M[6]

M[5]

M[4]

S_CLOCK

S_LOAD

VCC_PLL

XTAL_IN

12345678

24 23 22 21 20 19 18 17

VCC

XTAL_OUT

S_DATA

MPC9229

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

Table 1. Pin Configurations

Pin I/O Default Type Function

XTAL_IN, XTAL_OUT — — Analog Crystal oscillator interface

fOUT, fOUT Output —LVPECL Differential clock output

TEST Output —LVCMOS Test and device diagnosis output

S_LOAD Input 0LVCMOS Serial configuration control input

This inputs controls the loading of the configuration latches with the contents

of the shift register. The latches will be transparent when this signal is high,

thus the data must be stable on the high-to-low transition

P_LOAD Input 1LVCMOS Parallel configuration control input

This input controls the loading of the configuration latches with the content of

the parallel inputs (M and N). The latches will be transparent when this signal

is low, thus the parallel data must be stable on the low-to-high transition of

P_LOAD. P_LOAD is state sensitive

S_DATA Input 0LVCMOS Serial configuration data input

S_CLOCK Input 0LVCMOS Serial configuration clock input

M[0:8] Input 1LVCMOS Parallel configuration for PLL feedback divider (M).

M is sampled on the low-to-high transition of P_LOAD.

N[1:0] Input 1LVCMOS Parallel configuration for Post-PLL divider (N)

N is sampled on the low-to-high transition of P_LOAD

OE Input 1LVCMOS Output enable (active high).

The output enable is synchronous to the output clock to eliminate the

possibility of runt pulses on the fOUT output. OE = L low stops fOUT in the logic

low state (fOUT = L, fOUT = H)

GND Supply Supply Ground Negative power supply (GND).

VCC Supply Supply VCC Positive power supply for I/O and core. All VCC pins must be connected to

the positive power supply for correct operation.

VCC_PLL Supply Supply VCC PLL positive power supply (analog power supply).

Table 2. Output Frequency Range and Pll Post-Divider N

Output Division Output Frequency Range

1 0

0 0 1 200 – 400 MHz

0 1 2 100 – 200 MHz

1 0 4 50 – 100 MHz

1 1 8 25 – 50 MHz

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

Table 3. General Specifications

Symbol Characteristics Min Typ Max Unit Condition

VTT Output Termination Voltage — VCC –2 — V —

MM ESD Protection (Machine Model) 200 — — V —

HBM ESD Protection (Human Body Model) 2000 — — V —

LU Latch-Up Immunity 200 — — mA —

CIN Input Capacitance —4.0 —pF Inputs

θJA LQFP 32 Thermal Resistance Junction to Ambient

JESD 51-3, Single Layer Test Board

JESD 51-6, 2S2P Multilayer Test Board

—

83.1

73.3

68.9

63.8

57.4

59.0

54.4

52.5

50.4

47.8

86.0

75.4

70.9

65.3

59.6

60.6

55.7

53.8

51.5

48.8

°C/W

Natural Convection

100 ft/min

200 ft/min

400 ft/min

800 ft/min

Natural Convection

100 ft/min

200 ft/min

400 ft/min

800 ft/min

θJC LQFP 32 Thermal Resistance Junction to Case —23.0 26.3 °C/W MIL-SPEC 883E

Method 1012.1

Table 4. Absolute Maximum Ratings(1)

1. Absolute maximum continuous ratings are those maximum values beyond which damage to the device may occur. Exposure to these

conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation at absolute-maximum-rated

conditions is not implied.

Symbol Characteristics Min Max Unit

VCC Supply Voltage –0.3 3.9 V

VIN DC Input Voltage –0.3 VCC + 0.3 V

VOUT DC Output Voltage –0.3 VCC + 0.3 V

IIN DC Input Current —±20 mA

IOUT DC Output Current —±50 mA

TSStorage Temperature –65 125 °C

Table 5. DC Characteristics (VCC = 3.3 V ± 5%, TA = 0°C to +70°C)

Symbol Characteristics Min Typ Max Unit Condition

LVCMOS Control Inputs (P_LOAD, S_LOAD, S_DATA, S_CLOCK, M[0:8], N[0:1], OE)

VIH Input High Voltage 2.0 — VCC + 0.3 VLVCMOS

VIL Input Low Voltage — — 0.8 VLVCMOS

IIN Input Current(1)

1. Inputs have pull-down resistors affecting the input current.

— — ±200 µA VIN = VCC or GND

Differential Clock Output fOUT(2)

2. Outputs terminated 50 Ω to VTT = VCC –2 V.

VOH Output High Voltage(3)

3. The MPC9229 TEST output levels are compatible to the MC12429 output levels.

VCC –1.02 — VCC –0.74 VLVPECL

VOL Output Low Voltage(3) VCC –1.95 — VCC –1.60 VLVPECL

Test and Diagnosis Output TEST

VOH Output High Voltage(3) 2.0 — — V IOH = –0.8 mA

VOL Output Low Voltage(3) — — 0.55 V IOL = 0.8 mA

Supply Current

ICC_PLL Maximum PLL Supply Current — — 20 mA VCC_PLL Pins

ICC Maximum Supply Current — — 100 mA All VCC Pins

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

Table 6. AC Characteristics (VCC = 3.3 V ± 5%, TA = 0°C to +70°C)(1)

1. AC characteristics apply for parallel output termination of 50 Ω to VTT.

Symbol Characteristics Min Typ Max Unit Condition

fXTAL Crystal Interface Frequency Range 10 —20 MHz —

fVCO VCO Frequency Range(2)

2. The input frequency fXTAL and the PLL feedback divider M must match the VCO frequency range: fVCO = fXTAL ⋅ M ÷ 4.

800 —1600 MHz —

fMAX Output Frequency N = 00 (÷1)

N = 01 (÷2)

N = 10 (÷4)

N = 11 (÷8)

200

100

—400

200

100

MHz

—

DC Output Duty Cycle 45 50 55 % —

tr, tfOutput Rise/Fall Time 0.05 —0.3 ns 20% to 80%

fS_CLOCK Serial Interface Programming Clock Frequency(3)

3. The frequency of S_CLOCK is limited to 10 MHz in serial programming mode. S_CLOCK can be switched at higher frequencies when used

as test clock in test mode 6. Refer to Applications Information for more details.

0 — 10 MHz —

tP,MIN Minimum Pulse Width (S_LOAD, P_LOAD) 50 — — ns —

tSSetup Time S_DATA to S_CLOCK

S_CLOCK to S_LOAD

M, N to P_LOAD

— — ns

—

tSHold Time S_DATA to S_CLOCK

M, N to P_LOAD

— — ns

—

tJIT(CC) Cycle-to-Cycle Jitter N = 00 (÷1)

N = 01 (÷2)

N = 10 (÷4)

N = 11 (÷8)

— — 90

130

160

190

—

tJIT(PER) Period Jitter N = 00 (÷1)

N = 01 (÷2)

N = 10 (÷4)

N = 11 (÷8)

— — 70

120

140

170

—

tLOCK Maximum PLL Lock Time — — 10 ms —

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

PROGRAMMING INTERFACE

Programming the MPC9229

Programming the MPC9229 amounts to properly configuring the

internal PLL dividers to produce the desired synthesized frequency

at the output. The output frequency can be represented by this

formula:

fOUT = (fXTAL ÷ 16) ⋅ (4 ⋅ M) ÷ (4 ⋅ N) or (1)

fOUT = (fXTAL ÷ 16) ⋅ M ÷ N(2)

where fXTAL is the crystal frequency, M is the PLL feedback-divider

and N is the PLL post-divider. The input frequency and the selection

of the feedback divider M is limited by the VCO-frequency range.

fXTAL and M must be configured to match the VCO frequency range

of 800 to 1600 MHz in order to achieve stable PLL operation:

MMIN =4⋅fVCO,MIN ÷ fXTAL and (3)

MMAX =4⋅fVCO,MAX ÷ fXTAL (4)

For instance, the use of a 16 MHz input frequency requires the

configuration of the PLL feedback divider between M = 200 and

M = 400. Table 7. shows the usable VCO frequency and M divider

range for other example input frequencies. Assuming that a 16 MHz

input frequency is used, equation (2) reduces to:

fOUT = M ÷ N

Table 7. MPC9229 Frequency Operating Range

M M[8:0] VCO frequency for a crystal interface frequency of Output frequency for fXTAL = 16 MHz and for N =

10 12 14 16 18 20 1 2 4 16

160 010100000 800

170 010101010 850

180 010110100 810 900

190 010111110 855 950

200 011001000 800 900 1000 200 100 50 25

210 011010010 840 945 1050 210 105 52.5 26.25

220 011011100 880 990 1100 220 110 55 27.50

230 011100110 805 920 1035 1150 230 115 57.5 28.75

240 011110000 840 960 1080 1200 240 120 60 30

250 011111010 875 100 1125 1250 250 125 62.5 31.25

260 100000100 910 1040 1170 1300 260 130 65 32.50

270 100001110 810 945 1080 1215 1350 270 135 67.5 33.75

280 100011000 840 980 1120 1260 1400 280 140 70 35

290 100100010 870 1015 1160 1305 1450 290 145 72.5 36.25

300 100101100 900 1050 1200 1350 1500 300 150 75 37.5

310 100110110 930 1085 1240 1395 1550 310 155 77.5 38.75

320 101000000 800 960 1120 1280 1440 1600 320 160 80 40

330 101001010 825 990 1155 1320 1485 330 165 82.5 41.25

340 101010100 850 1020 1190 1360 1530 340 170 85 42.5

350 101011110 875 1050 1225 1400 1575 350 175 87.5 43.75

360 101101000 900 1080 1260 1440 360 180 90 45

370 101110010 925 1110 1295 1480 370 185 92.5 46.25

380 101111100 950 1140 1330 1520 380 190 95 47.5

390 110000110 975 1170 1365 1560 390 195 97.5 48.75

400 110010000 1000 1200 1400 1600 400 200 100 50

410 110011010 1025 1230 1435

420 110100100 1050 1260 1470

430 110101110 1075 1290 1505

440 110111000 1100 1320 1540

450 111000010 1125 1350 1575

510 111111110 1275 1530

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

Substituting N for the four available values for N (1, 2, 4, 8) yields: Example Frequency Calculation for an 16 MHz Input Frequency

If an output frequency of 131 MHz was desired the following steps

would be taken to identify the appropriate M and N values.

According to Table 8., 131 MHz falls in the frequency set by an value

of 2 so N[1:0] = 01. For N = 2 the output frequency is fOUT = M ÷ 2

and M = fOUT x 2. Therefore M = 2 x 131 = 262, so M[8:0] =

100000110. Following this procedure a user can generate any whole

frequency between 25 MHz and 400 MHz. Note than for N > 2

fractional values of can be realized. The size of the programmable

frequency steps (and thus the indicator of the fractional output

frequencies achievable) will be equal to:

fSTEP = fXTAL ÷ 16 ÷ N

APPLICATIONS INFORMATION

Using the Parallel and Serial Interface

The M and N counters can be loaded either through a parallel or

serial interface. The parallel interface is controlled via the P_LOAD

signal such that a LOW-to-HIGH transition will latch the information

present on the M[8:0] and N[1:0] inputs into the M and N counters.

When the P_LOAD signal is LOW, the input latches will be

transparent and any changes on the M[8:0] and N[1:0] inputs will

affect the fOUT output pair. To use the serial port, the S_CLOCK

signal samples the information on the S_DATA line and loads it into

a 14-bit shift register. Note that the P_LOAD signal must be HIGH

for the serial load operation to function. The Test register is loaded

with the first three bits, the N register with the next two and the M

input. For each register the most significant bit is loaded first (T2, N1,

and M8). A pulse on the S_LOAD pin after the shift register is fully

loaded will transfer the divide values into the counters. The HIGH-

to-LOW transition on the S_LOAD input will latch the new divide

values into the counters. Figure 3. illustrates the timing diagram for

both a parallel and a serial load of the MPC9229 synthesizer. M[8:0]

and N[1:0] are normally specified once at power-up through the

parallel interface, and then possibly again through the serial

interface. This approach allows the application to come up at one

frequency and then change or fine-tune the clock as the ability to

control the serial interface becomes available.

Using the Test and Diagnosis Output TEST

The TEST output provides visibility for one of the several internal

nodes as determined by the T[2:0] bits in the serial configuration

stream. It is not configurable through the parallel interface. Although

it is possible to select the node that represents fOUT

, the CMOS

output is not able to toggle fast enough for higher output frequencies

and should only be used for test and diagnosis. The T2, T1, and T0

control bits are preset to ‘000' when P_LOAD is LOW so that the

PECL fOUT outputs are as jitter-free as possible. Any active signal

on the TEST output pin will have detrimental affects on the jitter of

the PECL output pair. In normal operations, jitter specifications are

only guaranteed if the TEST output is static. The serial configuration

port can be used to select one of the alternate functions for this pin.

Most of the signals available on the TEST output pin are useful only

for performance verification of the MPC9229 itself. However the PLL

bypass mode may be of interest at the board level for functional

debug. When T[2:0] is set to 110, the MPC9229 is placed in PLL

bypass mode. In this mode the S_CLOCK input is fed directly into

the M and N dividers. The N divider drives the fOUT differential pair

and the M counter drives the TEST output pin. In this mode the

S_CLOCK input could be used for low speed board level functional

test or debug. Bypassing the PLL and driving fOUT directly gives the

user more control on the test clocks sent through the clock tree.

Figure 5. shows the functional setup of the PLL bypass mode.

Because the S_CLOCK is a CMOS level, the input frequency is

limited to 200 MHz. This means the fastest the fOUT pin can be

toggled via the S_CLOCK is 100 MHz as the divide ratio of the

Post-PLL divider is 2 (if N = 1). Note that the M counter output on the

TEST output will not be a 50% duty cycle.

Table 8. Output Frequency Range for fXTAL = 16 MHz

NfOUT fOUT Range fOUT Step

1 0 Value

0 0 1 M 200 – 400 MHz 1 MHz

0 1 2 M ÷2100 – 200 MHz 500 kHz

1 0 4 M ÷450 – 100 MHz 250 kHz

1 1 8 M ÷825 – 50 MHz 125 kHz

Table 9. Test and Debug Configuration for TEST

T[2:0] TEST Output

T2 T1 T0

00014-bit shift register out(1)

1. Clocked out at the rate of S_CLOCK

001Logic 1

0 1 0 fXTAL ÷ 16

011M-Counter out

1 0 0 fOUT

101Logic 0

110M-Counter out in PLL-bypass mode

1 1 1 fOUT ÷ 4

Table 10. Debug Configuration for PLL Bypass(1)

1. T[2:0] = 110. AC specifications do not apply in PLL bypass mode

Output Configuration

fOUT S_CLOCK ÷N

TEST M-Counter out(2)

2. Clocked out at the rate of S_CLOCK ÷(4 ⋅N)

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

Figure 3. Serial Interface Timing Diagram

Power Supply Filtering

The MPC9229 is a mixed analog/digital product. Its analog

circuitry is naturally susceptible to random noise, especially if this

noise is seen on the power supply pins. Random noise on the

VCC_PLL pin impacts the device characteristics. The MPC9229

provides separate power supplies for the digital circuitry (VCC) and

the internal PLL (VCC_PLL) of the device. The purpose of this design

technique is to try and isolate the high switching noise digital outputs

from the relatively sensitive internal analog phase-locked loop. In a

controlled environment such as an evaluation board, this level of

isolation is sufficient. However, in a digital system environment

where it is more difficult to minimize noise on the power supplies a

second level of isolation may be required. The simplest form of

isolation is a power supply filter on the VCC_PLL pin for the

MPC9229. Figure 4. illustrates a typical power supply filter scheme.

The MPC9229 is most susceptible to noise with spectral content in

the 1 kHz to 1 MHz range. Therefore, the filter should be designed

to target this range. The key parameter that needs to be met in the

final filter design is the DC voltage drop that will be seen between the

VCC supply and the MPC9229 pin of the MPC9229. From the data

sheet the VCC_PLL current (the current sourced through the VCC_PLL

pin) is maximum 20 mA, assuming that a minimum of 2.835 V must

be maintained on the VCC_PLL pin. The resistor shown in Figure 4.

must have a resistance of 10-15 Ω to meet the voltage drop criteria.

The RC filter pictured will provide a broadband filter with

approximately 100:1 attenuation for noise whose spectral content is

above 20 kHz. As the noise frequency crosses the series resonant

point of an individual capacitor its overall impedance begins to look

inductive and thus increases with increasing frequency. The parallel

capacitor combination shown ensures that a low impedance path to

ground exists for frequencies well above the bandwidth of the PLL.

Generally, the resistor/capacitor filter will be cheaper, easier to

implement and provide an adequate level of supply filtering. A higher

level of attenuation can be achieved by replacing the resistor with an

appropriate valued inductor. A 1000 µH choke will show a significant

impedance at 10 kHz frequencies and above. Because of the

current draw and the voltage that must be maintained on the

VCC_PLL pin, a low DC resistance inductor is required (less than

15 Ω).

Figure 4. VCC_PLL Power Supply Filter

Layout Recommendations

The MPC9229 provides sub-nanosecond output edge rates and

thus a good power supply bypassing scheme is a must. Figure 5.

shows a representative board layout for the MPC9229. There exists

many different potential board layouts and the one pictured is but

one. The important aspect of the layout in Figure 5. is the low

impedance connections between VCC and GND for the bypass

capacitors. Combining good quality general purpose chip capacitors

with good PCB layout techniques will produce effective capacitor

resonances at frequencies adequate to supply the instantaneous

switching current for the MPC9229 outputs. It is imperative that low

inductance chip capacitors are used; it is equally important that the

board layout does not introduce back all of the inductance saved by

using the leadless capacitors. Thin interconnect traces between the

capacitor and the power plane should be avoided and multiple large

vias should be used to tie the capacitors to the buried power planes.

Fat interconnect and large vias will help to minimize layout induced

inductance and thus maximize the series resonant point of the

bypass capacitors. Note the dotted lines circling the crystal oscillator

connection to the device. The oscillator is a series resonant circuit

and the voltage amplitude across the crystal is relatively small. It is

imperative that no actively switching signals cross under the crystal

as crosstalk energy coupled to these lines could significantly impact

the jitter of the device. Special attention should be paid to the layout

of the crystal to ensure a stable, jitter free interface between the

crystal and the on-board oscillator. Although the MPC9229 has

several design features to minimize the susceptibility to power

supply noise (isolated power and grounds and fully differential PLL),

there still may be applications in which overall performance is being

degraded due to system power supply noise. The power supply filter

and bypass schemes discussed in this section should be adequate

to eliminate power supply noise related problems in most designs.

S_CLOCK

S_DATA

S_LOAD

M[8:0]

N[1:0]

P_LOAD

T1 T0 N1 N0 M8 M7 M6 M5 M4 M3 M2 M1 M0

M, N

First

Bit

Last

Bit

VCC_PLL

VCC

MPC9229

C1, C2 = 0.01...0.1 µF

VCC

CF = 22 µF

RF = 10-15 Ω

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

Figure 5. PCB Board Layout Recommendation

for the PLCC28 Package

Using the On-Board Crystal Oscillator

The MPC9229 features a fully integrated on-board crystal

oscillator to minimize system implementation costs. The oscillator is

a series resonant, multivibrator type design as opposed to the more

common parallel resonant oscillator design. The series resonant

design provides better stability and eliminates the need for large on

chip capacitors. The oscillator is totally self contained so that the

only external component required is the crystal. As the oscillator is

somewhat sensitive to loading on its inputs the user is advised to

mount the crystal as close to the MPC9229 as possible to avoid any

board level parasitics. To facilitate co-location surface mount

crystals are recommended, but not required. Because the series

resonant design is affected by capacitive loading on the XTAL

terminals loading variation introduced by crystals from different

vendors could be a potential issue. For crystals with a higher shunt

capacitance, it may be required to place a resistance across the

terminals to suppress the third harmonic. Although typically not

required, it is a good idea to layout the PCB with the provision of

adding this external resistor. The resistor value will typically be

between 500 and 1 KΩ.

The oscillator circuit is a series resonant circuit and thus for

optimum performance a series resonant crystal should be used.

Unfortunately most crystals are characterized in a parallel resonant

mode. Fortunately there is no physical difference between a series

resonant and a parallel resonant crystal. The difference is purely in

the way the devices are characterized. As a result a parallel

resonant crystal can be used with the MPC9229 with only a minor

error in the desired frequency. A parallel resonant mode crystal used

in a series resonant circuit will exhibit a frequency of oscillation a few

hundred ppm lower than specified, a few hundred ppm translates to

kHz inaccuracies. In a general computer application this level of

inaccuracy is immaterial. Table 11. below specifies the performance

requirements of the crystals to be used with the MPC9229.

C2CF

XTAL

C1 C1

R1 = 10–15 Ω

C1 = 0.01 µF

C2 = 22 µF

C3 = 0.01 µF

= VCC

= GND

= Via Table 11. Recommended Crystal Specifications

Parameter Value

Crystal Cut Fundamental AT Cut

Resonance Series Resonance(1)

1. Refer to the accompanying text for series versus parallel

resonant discussion.

Frequency Tolerance ±75 ppm at 25°C

Frequency/Temperature Stability ±150 pm 0 to 70°C

Operating Range 0 to 70°C

Shunt Capacitance 5 – 7pF

Equivalent Series Resistance (ESR) 50 to 80 Ω

Correlation Drive Level 100 µW

Aging 5 ppm/Yr (First 3 Years)

PACKAGE DIMENSIONS

CASE 776-02

ISSUE D

28-LEAD PLCC PACKAGE

L-M

0.007 (0.180) N

VIEW S

L-M

0.007 (0.180) N

L-M

0.010 (0.250) N

L-M

0.007 (0.180) N

L-M

0.007 (0.180) N

G1X

VIEW D-D

VIEW S

L-M

0.010 (0.250) N

L-M

0.007 (0.180) N

0.004 (0.100)

SEATING

PLANE

L-M

0.007 (0.180) N

-T-

-N-

-M-

-L-

Y BRK

28 1

MILLIMETERSINCHES

0.050 BSC 1.27 BSC

DIM

MIN

0.485

0.165

0.090

0.013

0.026

0.020

0.025

0.450

0.042

---

2˚

0.410

0.040

MAX

0.495

0.180

0.110

0.019

0.032

---

0.456

0.048

0.056

0.020

10˚

0.430

---

MIN

12.32

4.20

2.29

0.33

0.66

0.51

0.64

11.43

1.07

---

2˚

10.42

1.02

MAX

12.57

4.57

2.79

0.48

0.81

---

11.58

1.21

1.42

0.50

10˚

10.92

---

NOTES:

DATUMS -L-, -M-, AND -N- DETERMINED

WHERE TOP OF LEAD SHOULDER EXISTS

PLASTIC BODY AT MOLD PARTING LINE.

DIMENSION G1, TRUE POSITION TO BE

MEASURED AT DATUM -T-, SEATING PLANE.

DIMENSIONS R AND U DO NOT INCLUDE

MOLD FLASH. ALLOWABLE MOLD FLASH IS

0.010 (0.250) PER SIDE.

DIMENSIONING AND TOLERANCING PER

ANSI Y14.5M, 1982.

CONTROLLING DEMENSION: INCH.

THE PACKAGE TOP MAY BE SMALLER THAN

THE PACKAGE BOTTOM BY UP TO 0.012

(0.300). DIMENSIONS R AND U ARE

DETERMINED AT THE OUTERMOST

EXTREMES OF THE PLASTIC BODY

EXCLUSIVE OF MOLD FLASH, TIE BAR

BURRS, GATE BURRS AND INTERLEAD

FLASH, BUT INCLUDING ANY MISMATCH

BETWEEN THE TOP AND BOTTOM OF THE

PLASITC BODY.

DIMENSION H DOES NOT INCLUDE DAMBAR

PROTRUSION OR INTRUSION. THE DAMBAR

PROTRUSION(S) SHALL NOT CAUSE THE H

DIMENSION TO BE GREATER THAN 0.037

(0.940). THE DAMBAR INTRUSION(S) SHALL

NOT CAUSE THE H DIMENSION TO BE

SMALLER THAN 0.025 (0.635).

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

PACKAGE DIMENSIONS

12 REF

DIM MIN MAX

MILLIMETERS

7.00 BSC

0.80 BSC

9.00 BSC

b1 0.30 0.40

c0.09 0.20

c1 0.09 0.16

L1 1.00 REF

R1 0.08 0.20

1.40 1.60

0.05 0.15

1.35 1.45

0.30 0.45

0.08 ---

0˚ 7˚

9.00 BSC

7.00 BSC

0.50 0.70

0.20 REF

D/2

EE1

D1/2

E1/2

E/2

A-B0.20 H D

A-B0.20 C D

DETAIL G

PIN 1 INDEX

DETAIL AD

R R2

θ˚

(S) L

(L1)

0.25

GAUGE PLANE

(θ1˚)

R R1

SEATING

PLANE

DETAIL AD

0.1 C

32X

28X

DETAIL G

e/2 A, B, D

SECTION F-F

BASE

c1c

METAL

A-B

0.20 DC

5 8

PLATING

NOTES:

1. DIMENSIONS ARE IN MILLIMETERS.

2. INTERPRET DIMENSIONS AND TOLERANCES PER

ASME Y14.5M, 1994.

3. DATUMS A, B, AND D TO BE DETERMINED AT

DATUM PLANE H.

4. DIMENSIONS D AND E TO BE DETERMINED AT

SEATING PLANE C.

5. DIMENSION b DOES NOT INCLUDE DAMBAR

PROTRUSION. ALLOWABLE DAMBAR PROTRUSION

SHALL NOT CAUSE THE LEAD WIDTH TO EXCEED

THE MAXIMUM b DIMENSION BY MORE THAN

0.08-mm. DAMBAR CANNOT BE LOCATED ON THE

LOWER RADIUS OR THE FOOT. MINIMUM SPACE

BETWEEN PROTRUSION AND ADJACENT LEAD OR

PROTRUSION: 0.07-mm.

6. DIMENSIONS D1 AND E1 DO NOT INCLUDE MOLD

PROTRUSION. ALLOWABLE PROTRUSION IS

0.25-mm PER SIDE. D1 AND E1 ARE MAXIMUM

PLASTIC BODY SIZE DIMENSIONS INCLUDING

MOLD MISMATCH.

7. EXACT SHAPE OF EACH CORNER IS OPTIONAL.

8. THESE DIMENSIONS APPLY TO THE FLAT

SECTION OF THE LEAD BETWEEN 0.1-mm AND

0.25-mm FROM THE LEAD TIP.

CASE 873A-03

ISSUE B

32-LEAD LQFP PACKAGE

MPC9229 Data Sheet 400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER

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