MOTOROLA MPC9100

SEMICONDUCTOR TECHNICAL DATA
The MPC9100 is a dual PLL phase locked loop clock generator. The
device synthesizes a 14.318 MHz input reference to provide a buffered
copy of the input reference, a 31.3344MHz clock output and a 45.1584
clock output.
The device features a fully integrated crystal oscillator as the clock
reference source. No external components are required other than the
14.318 MHz crystal. The TCLK input is used only for factory test and
cannot be used as the PLL clock reference. To reduce total die area the
PLL loop filter capacitors are brought outside the chip. The FCAP pins are
used to connect these capacitors to the internal PLL’s. 0.01µf capacitors
are recommended.
The device features three synchronous output enable pins to allow for
shutting down specific clocks. When driven to a logic LOW the OE pins
will freeze the selected clock in its low state. Internal timing has been
established that guarantee transition into and out of the freeze state will
not produce output glitches. These control inputs have internal pull up
resistors so that they will default to the output active state.
The TEST0–2 pins allow for the testing of the internal logic of the
device. Most of the states are reserved for factory test use with one
exception. When the TEST 0 pin is driven low the internal state machines
will be reset and the outputs will be driven into high impedance. The
TEST pins also have internal pull up resistors such that they will default
into the normal operation mode of the chip.
The MPC9100 features separate internal power buses to try to isolate
the output noise from the internal PLL’s and the other outputs. The VCCA
pins are the power supply pins for the analog PLL’s, the VCCI pin is the
power supply for the internal core logic and the VCCO’s are the power
pins for the output buffers. All of these pins should be tied to a common
power plane on the printed circuit board.
FUNCTION TABLES
DUAL PLL
CLOCK GENERATOR
FA SUFFIX
TQFP PACKAGE
CASE 873A–02
PIN DESCRIPTION
TEST2
TEST1
TEST0
Function
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Factory Test
Factory Test
Factory Test
Factory Test
Factory Test
Factory Test
Master Reset/Tristate
Normal Operation
OE_XX
Function
0
1
Output LOW
Output Active
Pin
Description
Q_31
Q_14
Q_45
VCCO_XX
GNDO_XX
VCCI
GNDI
VCCAX
GNDAX
XTAL1
XTAL2
TCLK
FCAPXX
FCAPXXP
31.3344MHz Output
14.318MHz Output
45.1584MHz Output
Output Buffer Power Supply
Output Buffer Ground
Core Logic Power Supply
Core Logic Ground
PLL Power Supply
PLL Ground
Crystal Oscillator Input
Crystal Oscillator Input
LVCMOS Reference Clock Input
PLL Filter Capacitor Input
PLL Filter Capacitor Input
10/96
 Motorola, Inc. 1996
1
REV 0
MPC9100
GND_31
TEST0
TEST1
TEST2
GND_45
Q_45
VCCO_45
GND_14
Pinout: 32–Lead TQFP Package (Top View)
24
23
22
21
20
19
18
17
Q_31
25
16
Q_14
VCCO_31
26
15
VCCO_14
GNDA1
27
14
GNDA2
FCAPB1P
28
13
FCAPB2P
MPC9100
FCAPA1
31
10
FCAPA2
VCCA1
32
9
VCCA2
1
2
3
4
5
6
7
8
GNDI
FCAPA2P
XTAL2
11
XTAL1
30
TCLK
FCAPA1P
OE_14
FCAPB2
OE_45
12
OE_31
29
VCCI
FCAPB1
LOGIC DIAGRAM
PLL#1
Divider
Q_31
TCLK
XTAL1
XTAL2
Q_14
XTAL
OSC
PLL#2
Divider
Q_45
TEST
LOGIC
TEST0
TEST1
TEST2
MOTOROLA
2
TIMING SOLUTIONS
BR1333 — REV 5
MPC9100
ABSOLUTE MAXIMUM RATINGS*
Symbol
Parameter
Min
Max
Unit
VCC
Supply Voltage
–0.3
4.6
V
VI
Input Voltage
–0.3
VDD + 0.3
V
IIN
Input Current
±20
mA
TStor
Storage Temperature Range
–40
125
°C
* Absolute maximum continuous ratings are those 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 under absolute–maximum–rated conditions is
not implied.
PLL INPUT REFERENCE CHARACTERISTICS (TA = 0 to 70°C)
Symbol
fref
Characteristic
Reference Input Frequency
Min
Max
Unit
10
20
MHz
Condition
DC CHARACTERISTICS (TA = 0° to 70°C, VCC = 3.3V ±5%)
Symbol
Characteristic
Min
Typ
Max
Unit
3.6
V
VIH
Input HIGH Voltage
2.0
VIL
Input LOW Voltage
0.8
V
VOH
Output HIGH Voltage
2.4
V
VOL
Output LOW Voltage
IIN
Input Current
ICC
Maximum Quiescent Supply Current
Condition
0.5
V
IOH = –20mA1
IOL = 20mA1
±120
µA
Note 2
mA
CIN
4
pF
Cpd
25
pF
1. The MPC9100 outputs can drive series or parallel terminated 50Ω (or 50Ω to VCC/2) transmission lines on the incident edge (see Applications
Info section).
2. Inputs have pull–up resistors which affect input current, PECL_CLK has a pull–down resistor.
AC CHARACTERISTICS (TA = 0° to 70°C, VCC = 3.3V ±0.3V)
Symbol
Characteristic
Max
Unit
0.15
Min
Typ
1.0
ns
0.8 to 2.0V, 50Ω to
VCC/2
45
55
%
50Ω to VCC/2
20
MHz
8.0
ns
50Ω to VCC/2
10
ns
50Ω to VCC/2
±250
ps
Note 3
tr, tf
Output Rise/Fall Time
tpw
Output Duty Cycle
fXtal
Crystal Oscillator Frequency Range
10
tPLZ, tPHZ
Output Disable Time
2.0
5.0
tPZL
Output Enable Time
3.0
6.5
tjitter
Cycle–to–Cycle Jitter (Peak–to–Peak)
±100
Condition
Note 2
tlock
Maximum PLL Lock Time
10
ms
1. X1, X2, X3, and X4 all to be determined. The specs hold only when the MPC9100 is used in the external feedback mode.
2. See Applications Info section for crystal specifications.
3. All outputs switching.
TIMING SOLUTIONS
BR1333 — REV 5
3
MOTOROLA
MPC9100
0.01µF
24
23
22
21
20
19
18
17
25
16
26
15
27
14
0.01µF
0.01µF
13
28
MPC9100
0.1µF
0.1µF
29
12
30
11
31
10
0.1µF
0.1µF
9
32
1
2
3
4
5
6
7
8
14.318MHz
Crystal
Figure 1. Recommended External Components
(See Applications Section for Optional Analog Supply Filter)
APPLICATIONS INFORMATION
Power Supply Filtering
3.3V
The MPC9100 is a mixed analog/digital product and as
such it exhibits some sensitivities that would not necessarily
be seen on a fully digital product. Analog circuitry is naturally
susceptible to random noise, especially if this noise is seen
on the power supply pins. The MPC9100 provides separate
power supplies for the output buffers (VCCO) and the internal
PLL (VCCA) 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 VCCA pin for the MPC9100.
MOTOROLA
RS=10–15Ω
VCCA
22µF
MPC9100
0.01µF
VCC
0.01µF
Figure 2. Power Supply Filter
4
TIMING SOLUTIONS
BR1333 — REV 5
MPC9100
than a series resonant crystal, a parallel resonant crystal is
simply a crystal which has been characterized in its parallel
resonant mode. Therefore in the majority of cases a parallel
specified crystal can be used with the MPC9100 with just a
minor frequency error due to the actual series resonant
frequency of the parallel resonant specified crystal. Typically
a parallel specified crystal used in a series resonant mode
will exhibit an oscillatory frequency a few hundred ppm lower
than the specified value. For most processor
implementations a few hundred ppm translates into kHz
inaccuracies, a level which does not represent a major issue.
Figure 2 illustrates a typical power supply filter scheme.
The MPC9100 is most susceptible to noise with spectral
content in the 1KHz to 1MHz 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 VCCA
pin of the MPC9100. The current into the VCCA pin is
typically 15mA (20mA maximum), assuming that a minimum
of 3.0V must be maintained on the PLL_VCC pin very little
DC voltage drop can be tolerated when a 3.3V VCC supply is
used. The resistor shown in Figure 2 must have a resistance
of 10–15Ω 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
20KHz. As the noise frequency crosses the series resonant
point of an individual capacitor it’s 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.
Table 1. Crystal Specifications
Parameter
A higher level of attenuation can be achieved by replacing
the resistor with an appropriate valued inductor. A 1000µH
choke will show a significant impedance at 10KHz
frequencies and above. Because of the current draw and the
voltage that must be maintained on the PLL_VCC pin a low
DC resistance inductor is required (less than 15Ω). Generally
the resistor/capacitor filter will be cheaper, easier to
implement and provide an adequate level of supply filtering.
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance*
Frequency Tolerance
±75ppm at 25°C
Frequency/Temperature Stability
±150pm 0 to 70°C
Operating Range
0 to 70°C
Shunt Capacitance
5–7pF
Equivalent Series Resistance (ESR)
50 to 80Ω
Correlation Drive Level
100µW
Aging
5ppm/Yr (First 3 Years)
* See accompanying text for series versus parallel resonant
discussion.
Although the MPC9100 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 schemes discussed in this section should be
adequate to eliminate power supply noise related problems
in most designs.
Driving Transmission Lines
The MPC9100 clock driver was designed to drive high
speed signals in a terminated transmission line environment.
To provide the optimum flexibility to the user the output
drivers were designed to exhibit the lowest impedance
possible. With an output impedance of less than 10Ω the
drivers can drive either parallel or series terminated
transmission lines. For more information on transmission
lines the reader is referred to application note AN1091 in the
Timing Solutions brochure (BR1333/D).
Using the On–Board Crystal Oscillator
The MPC9100 features an on–board crystal oscillator to
allow for seed clock generation as well as final distribution.
The on–board oscillator is completely 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 MPC9100
as possible to avoid any board level parasitics. To facilitate
co–location surface mount crystals are recommended, but
not required. In addition, with crystals with a higher shunt
capacitance, it may be necessary to place a 1k resistor
across the two crystal leads.
In most high performance clock networks point–to–point
distribution of signals is the method of choice. In a
point–to–point scheme either series terminated or parallel
terminated transmission lines can be used. The parallel
technique terminates the signal at the end of the line with a
50Ω resistance to 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 MPC9100 clock driver. For
the series terminated case however there is no DC current
draw, thus the outputs can drive multiple series terminated
lines. Figure 3 illustrates an output driving a single series
terminated line vs two series terminated lines in parallel.
When taken to its extreme the fanout of the MPC9100 clock
driver is effectively doubled due to its capability to drive
multiple lines.
The oscillator circuit is a series resonant circuit as
opposed to the more common parallel resonant circuit, this
eliminates the need for large on–board capacitors. Because
the design is a series resonant design for the optimum
frequency accuracy a series resonant crystal should be used
(see specification table below). Unfortunately most off the
shelf crystals are characterized in a parallel resonant mode.
However a parallel resonant crystal is physically no different
TIMING SOLUTIONS
BR1333 — REV 5
Value
5
MOTOROLA
MPC9100
3.0
MPC9100
OUTPUT
BUFFER
7Ω
MPC9100
OUTPUT
BUFFER
IN
RS = 43Ω
OutA
RS = 43Ω
OutA
tD = 3.8956
OutB
tD = 3.9386
ZO = 50Ω
VOLTAGE (V)
IN
2.5
ZO = 50Ω
2.0
In
1.5
1.0
OutB0
7Ω
RS = 43Ω
0.5
ZO = 50Ω
OutB1
0
2
Figure 3. Single versus Dual Transmission Lines
4
6
8
TIME (nS)
10
12
14
Figure 4. Single versus Dual Waveforms
The waveform plots of Figure 4 show the simulation
results of an output driving a single line vs two lines. In both
cases the drive capability of the MPC9100 output buffers is
more than sufficient to drive 50Ω 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. This suggests that the dual line
driving need not be used exclusively to maintain the tight
output–to–output skew of the MPC9100. The output
waveform in Figure 4 shows a step in the waveform, this step
is caused by the impedance mismatch seen looking into the
driver. The parallel combination of the 43Ω series resistor
plus the output impedance does not match the parallel
combination of the line impedances. The voltage wave
launched down the two lines will equal:
Since this step is well above the threshold region it will not
cause any false clock triggering, however designers may be
uncomfortable with unwanted reflections on the line. To
better match the impedances when driving multiple lines the
situation in Figure 5 should be used. In this case the series
terminating resistors are reduced such that when the parallel
combination is added to the output buffer impedance the line
impedance is perfectly matched.
MPC9100
OUTPUT
BUFFER
ZO = 50Ω
RS = 36Ω
ZO = 50Ω
7Ω
VL = VS ( Zo / (Rs + Ro +Zo))
Zo = 50Ω || 50Ω
Rs = 43Ω || 43Ω
Ro = 7Ω
7Ω + 36Ω k 36Ω = 50Ω k 50Ω
25Ω = 25Ω
VL = 3.0 (25 / (21.5 + 7 + 25) = 3.0 (25 / 53.5)
= 1.40V
Figure 5. Optimized Dual Line Termination
SPICE level output buffer models are available for
engineers who want to simulate their specific interconnect
schemes. In addition IV characteristics are in the process of
being generated to support the other board level simulators in
general use.
At the load end the voltage will double, due to the near
unity reflection coefficient, to 2.8V. It will then increment
towards the quiescent 3.0V in steps separated by one round
trip delay (in this case 4.0ns).
MOTOROLA
RS = 36Ω
6
TIMING SOLUTIONS
BR1333 — REV 5
MPC9100
OUTLINE DIMENSIONS
A
–T–, –U–, –Z–
FA SUFFIX
TQFP PACKAGE
CASE 873A–02
ISSUE A
4X
A1
32
0.20 (0.008) AB T–U Z
25
1
–U–
–T–
B
V
AE
P
B1
DETAIL Y
17
8
V1
AE
DETAIL Y
9
4X
–Z–
9
0.20 (0.008) AC T–U Z
S1
S
DETAIL AD
G
–AB–
0.10 (0.004) AC
AC T–U Z
–AC–
BASE
METAL
ÉÉ
ÉÉ
ÉÉ
ÉÉ
F
8X
M_
R
J
M
N
D
0.20 (0.008)
SEATING
PLANE
SECTION AE–AE
W
K
X
DETAIL AD
TIMING SOLUTIONS
BR1333 — REV 5
Q_
GAUGE PLANE
H
0.250 (0.010)
C E
7
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DATUM PLANE –AB– IS LOCATED AT BOTTOM OF
LEAD AND IS COINCIDENT WITH THE LEAD
WHERE THE LEAD EXITS THE PLASTIC BODY AT
THE BOTTOM OF THE PARTING LINE.
4. DATUMS –T–, –U–, AND –Z– TO BE DETERMINED
AT DATUM PLANE –AB–.
5. DIMENSIONS S AND V TO BE DETERMINED AT
SEATING PLANE –AC–.
6. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS
0.250 (0.010) PER SIDE. DIMENSIONS A AND B
DO INCLUDE MOLD MISMATCH AND ARE
DETERMINED AT DATUM PLANE –AB–.
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. DAMBAR PROTRUSION SHALL
NOT CAUSE THE D DIMENSION TO EXCEED
0.520 (0.020).
8. MINIMUM SOLDER PLATE THICKNESS SHALL BE
0.0076 (0.0003).
9. EXACT SHAPE OF EACH CORNER MAY VARY
FROM DEPICTION.
DIM
A
A1
B
B1
C
D
E
F
G
H
J
K
M
N
P
Q
R
S
S1
V
V1
W
X
MILLIMETERS
MIN
MAX
7.000 BSC
3.500 BSC
7.000 BSC
3.500 BSC
1.400
1.600
0.300
0.450
1.350
1.450
0.300
0.400
0.800 BSC
0.050
0.150
0.090
0.200
0.500
0.700
12_ REF
0.090
0.160
0.400 BSC
1_
5_
0.150
0.250
9.000 BSC
4.500 BSC
9.000 BSC
4.500 BSC
0.200 REF
1.000 REF
INCHES
MIN
MAX
0.276 BSC
0.138 BSC
0.276 BSC
0.138 BSC
0.055
0.063
0.012
0.018
0.053
0.057
0.012
0.016
0.031 BSC
0.002
0.006
0.004
0.008
0.020
0.028
12_ REF
0.004
0.006
0.016 BSC
1_
5_
0.006
0.010
0.354 BSC
0.177 BSC
0.354 BSC
0.177 BSC
0.008 REF
0.039 REF
MOTOROLA
MPC9100
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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
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MOTOROLA
◊
8
*MPC9100/D*
MPC9100/D
TIMING SOLUTIONS
BR1333 — REV 5