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Motorola Electronic Components Datasheet

MC88PL117FN Datasheet

CMOS PLL CLOCK DRIVER

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MC88PL117FN pdf
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Not Recommended for New Designs
CMOS PLL Clock Driver
Programmable Frequency, Low Skew,
High Fan-Out
MC88PL117
The MC88PL117 utilizes proven phase–locked loop clock driver
technology to create a large fan–out, multiple frequency and phase, low
skew clock driver. The 88PL117 provides the clock frequencies
necessary to drive systems using the PowerPC601 microprocessor
and the Pentiummicroprocessor (see applications section for details).
A total of 14 high current, matched impedance outputs are available in 8
programmable output frequency and phase configurations. Output
frequencies are referenced to a system frequency, Q, and are available at
2X, 1X, and 1/2X the Q frequency. Four programmable input frequency
multiplication ratios can be programmed to provide outputs at 1X, 2X, and
4X the system frequency Q. Details on the programmable configurations
can be found in the applications section of this data sheet.
CMOS PLL
CLOCK DRIVER
Clock Driver for PowerPC 601 and Pentium Microprocessors
14 programmable outputs
Maximum output–to–output skew of 500ps for a single frequency
Maximum output–to–output skew of 500ps for multiple frequencies
fMAX of 2X_Q = 120MHz
One output with programmable phase capability
±36mA DC current outputs drive 50transmission lines
A lock indicator output (LOCK) goes high when steady–state
phase–lock is achieved
OE/MR 3–state control
Dedicated feedback output
Two selectable clock inputs
PLL enable pin for testability
Dynamic Switch Between SYNC Inputs
FN SUFFIX
52–LEAD PLASTIC LEADLESS
CHIP CARRIER (PLCC)
CASE 778–02
One output (QFEED) is dedicated for feedback. It is located physically close to the FEEDBACK input pin to minimize the
feedback line length. External delay (increased wire length) or logic can be inserted in the feedback path if necessary. Proper
termination of the feedback line is necessary for any line length over one inch.
One output is provided with up to eight selectable 1/8 or 1/4 period (45° or 90°) delay increments. Three control pins, 2, 1
and 0, program the eight increments; the increment/phase shift positions are shown in Table 3. in the applications section.
All outputs can be 3–stated (high impedance) during board–level testing with the OE/MR pin; the QFEED and LOCK outputs
will not be 3–stated, which allows the 88PL117 to remain in a phase–locked condition. Correct phase and frequency coherency
will be guaranteed one to two cycles after bringing the OE/MR pin high. The PLL_EN pin disables the PLL and gates the SYNC
input signal directly into the internal clock distribution network to provide low frequency testability. Two selectable SYNC inputs
(SYNC0 and SYNC1) are provided for clock redundancy or ease of testability. The device is guaranteed to lock to the new SYNC
input when the REF_SEL input is switched dynamically.
A phase–lock indicator output (LOCK) stays low when the part is out of lock (start–up, etc.) and goes high when steady–state
phase–lock is achieved. The lock indicator circuitry works reliably for VCO frequencies down to 55MHz. For VCO frequencies
less than 55MHz, no guarantees are offered for the lock indicator output.
The MC88PL117 VCO is capable of operating at frequencies higher than the output divider and feedback structures are able
to follow. When the VCO is in the mode described above, it is referred to as “runaway” and the device will not lock. The condition
usually occurs at power–up. To avoid runaway, it is recommended that the device be fully powered before a sync signal is
applied.
PowerPC is a trademark of International Business Machines Corporation.
1/97
© Motorola, Inc. 1997
1
REV 4


Motorola Electronic Components Datasheet

MC88PL117FN Datasheet

CMOS PLL CLOCK DRIVER

No Preview Available !

MC88PL117FN pdf
MC88PL117
LOCK
OE/MR
Q0
VCC
Q1
GND
Q2
VCC
Q3
GND
OPT0
OPT1
OPT2
QFEED VCC FEEDBACK GND AVCC FIL AGND GND Q13 VCC Q12 REF_SEL SYNC1
46 45 44 43 42 41 40 39 38 37 36 35 34
47 33
48 32
49 31
50 30
51 29
52 28
MC88PL117
1 27
2 26
3 25
4 24
5 23
6 22
7
8
21
9 10 11 12 13 14 15 16 17 18 19 20
MULT0 MULT1 GND Q4 VCC Q5 GND Q6 VCC Q7 0 1 2
Pinout: 52–Lead PLCC (Top View)
SYNC0
DVDD
DGND
Q
Q11
VCC
Q10
GND
Q9
VCC
Q8
GND
PLL_EN
MOTOROLA
2 TIMING SOLUTIONS
BR1333 — Rev 6


Part Number MC88PL117FN
Description CMOS PLL CLOCK DRIVER
Maker Motorola
Total Page 11 Pages
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