Cypress CY7B9911V - Manual

CY7B9911V
3.3V RoboClock+™
High Speed Low Voltage Programmable Skew
Clock Buffer
Cypress Semiconductor Corporation • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600
Document Number: 38-07408 Rev. *D Revised June 20, 2007
Features
■ All output pair skew <100 ps typical (250 max)
■ 3.75 to 110 MHz output operation
■ User selectable output functions
❐ Selectable skew to 18 ns
❐ Inverted and non-inverted
❐ Operation at
1 ⁄
2
and
1 ⁄
4
input frequency
❐ Operation at 2x and 4x input frequency (input as low as
3.75 MHz)
■ Zero input-to-output delay
■ 50% duty cycle outputs
■ LVTTL outputs drive 50
Ω terminated lines
■ Operates from a single 3.3V supply
■ Low operating current
■ 32-pin PLCC package
■ Jitter 100 ps (typical)
Functional Description
The CY7B9911V 3.3V RoboClock+™ High Speed Low
Voltage Programmable Skew Clock Buffer (LVPSCB) offers
user selectable control over system clock functions. These
multiple output clock drivers provide the system integrator with
functions necessary to optimize the timing of high perfor-
mance computer systems. Each of the eight individual drivers,
arranged in four pairs of user controllable outputs, can drive
terminated transmission lines with impedances as low as 50
Ω.
They deliver minimal and specified output skews and full swing logic
levels (LVTTL).
Each output is hardwired to one of nine delay or function
configurations. Delay increments of 0.7 to 1.5 ns are deter-
mined by the operating frequency with outputs that can skew
up to ±6 time units from their nominal “zero” skew position. The
completely integrated PLL allows external load and cancels
the transmission line delay effects. When this “zero delay”
capability of the LVPSCB is combined with the selectable
output skew functions, you can create output-to-output delays
of up to ±12 time units.
Divide-by-two and divide-by-four output functions are provided
for additional flexibility in designing complex clock systems.
When combined with the internal PLL, these divide functions
allow distribution of a low frequency clock that are multiplied
by two or four at the clock destination. This facility minimizes
clock distribution difficulty enabling maximum system clock
speed and flexibility.
TEST
FB
REF
VCO AND
TIME UNIT
GENERATOR
FS
SELECT
INPUTS
(THREE
LEVEL) SKEW
SELECT
MATRIX
4F0
4F1
3F0
3F1
2F0
2F1
1F0
1F1
4Q0
4Q1
3Q0
3Q1
2Q0
2Q1
1Q0
1Q1
FILTER
PHASE
FREQ
DET
Logic Block Diagram
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