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MC88LV915T Datasheet, PDF (1/11 Pages) Motorola, Inc – LOW SKEW CMOS PLL CLOCK DRIVER | |||
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Low Voltage Low Skew
CMOS PLL Clock Driver,
3-State
MC88LV915T
The MC88LV915T Clock Driver utilizes phaseâlocked loop technology
to lock its low skew outputsâ frequency and phase onto an input reference
clock. It is designed to provide clock distribution for high performance
PCâs and workstations.
The PLL allows the high current, low skew outputs to lock onto a single
clock input and distribute it with essentially zero delay to multiple
components on a board. The PLL also allows the MC88LV915T to
multiply a low frequency input clock and distribute it locally at a higher
(2X) system frequency. Multiple 88LV915âs can lock onto a single
reference clock, which is ideal for applications when a central system
clock must be distributed synchronously to multiple boards (see Figure 4
on Page 9).
LOW SKEW CMOS
PLL CLOCK DRIVER
Five âQâ outputs (Q0âQ4) are provided with less than 500 ps skew between their rising edges. The Q5 output is inverted (180°
phase shift) from the âQâ outputs. The 2X_Q output runs at twice the âQâ output frequency, while the Q/2 runs at 1/2 the âQâ
frequency.
The VCO is designed to run optimally between 20 MHz and the 2X_Q Fmax specification. The wiring diagrams in Figure 2 detail
the different feedback configurations which create specific input/output frequency relationships. Possible frequency ratios of the
âQâ outputs to the SYNC input are 2:1, 1:1, and 1:2.
The FREQ_SEL pin provides one bit programmable divideâby in the feedback path of the PLL. It selects between divideâbyâ1
and divideâbyâ2 of the VCO before its signal reaches the internal clock distribution section of the chip (see the block diagram on
page 2). In most applications FREQ_SEL should be held high (÷1). If a low frequency reference clock input is used, holding
FREQ_SEL low (÷2) will allow the VCO to run in its optimal range (>20MHz).
In normal phaseâlocked operation the PLL_EN pin is held high. Pulling the PLL_EN pin low disables the VCO and puts the
88LV915T in a static âtest modeâ. In this mode there is no frequency limitation on the input clock, which is necessary for a low
frequency board test environment. The second SYNC input can be used as a test clock input to further simplify boardâlevel testing
(see detailed description on page 11).
Pulling the OE/RST pin low puts the clock outputs 2X_Q, Q0âQ4, Q5 and Q/2 into a high impedance state (3âstate). After the
OE/RST pin goes back high Q0âQ4, Q5 and Q/2 will be reset in the low state, with 2X_Q being the inverse of the selected SYNC
input. Assuming PLL_EN is low, the outputs will remain reset until the 88LV915 sees a SYNC input pulse.
A lock indicator output (LOCK) will go high when the loop is in steadyâstate phase and frequency lock. The LOCK output will go
low if phaseâlock is lost or when the PLL_EN pin is low. The LOCK output will go high no later than 10ms after the 88LV915 sees a
SYNC signal and full 5V VCC.
Features
⢠Five Outputs (Q0âQ4) with OutputâOutput Skew < 500 ps each being phase and frequency locked to the SYNC input
⢠The phase variation from partâtoâpart between the SYNC and FEEDBACK inputs is less than 550 ps (derived from the tPD
specification, which defines the partâtoâpart skew)
⢠Input/Output phaseâlocked frequency ratios of 1:2, 1:1, and 2:1 are available
⢠Input frequency range from 5MHz â 2X_Q FMAX spec.
⢠Additional outputs available at 2X and +2 the system âQâ frequency. Also a Q (180° phase shift) output available
⢠All outputs have ±36 mA drive (equal high and low) at CMOS levels, and can drive either CMOS or TTL inputs. All inputs
are TTLâlevel compatible. ±88mA IOL/IOH specifications guarantee 50⦠transmission line switching on the incident edge
⢠Test Mode pin (PLL_EN) provided for low frequency testing. Two selectable CLOCK inputs for test or redundancy purposes.
All outputs can go into high impedance (3âstate) for board test purposes
⢠Lock Indicator (LOCK) accuracy indicates a phaseâlocked state
Yield Surface Modeling and YSM are trademarks of Motorola, Inc.
1/97
© Motorola, Inc. 1997
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