RoboClock®, CY7B995
2.5/3.3V 200-MHz High-Speed
Multi-Phase PLL Clock Buffer
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
, CA 95134-1709
•
408-943-2600
Document #: 38-07337 Rev. *D
Revised September 27, 2007
Features
■ 2.5V or 3.3V operation
■ Split output bank power supplies
■ Output frequency range: 6 MHz to 200 MHz
■ 45 ps typical cycle-cycle jitter
■ ± 2% max output duty cycle
■ Selectable output drive strength
■ Selectable positive or negative edge synchronization
■ Eight LVTTL outputs driving 50 Ω terminated lines
■ LVCMOS/LVTTL over-voltage tolerant reference input
■ Selectable phase-locked loop (PLL) frequency range and lock
indicator
■ Phase adjustments in 625/1250 ps steps up to ± 7.5 ns
■ (1-6, 8, 10, 12) x multiply and (1/2,1/4)x divide ratios
■ Spread-Spectrum compatible
■ Power down mode
■ Selectable reference divider
■ Industrial temperature range: –40°C to +85°C
■ 44-pin TQFP package
Description
The CY7B995 RoboClock® is a low voltage, low power,
eight-output, 200 MHz clock driver. It features output phase
programmability which is necessary to optimize the timing of high
performance computer and communication systems.
The user can program both the frequency and the phase of the
output banks through nF[0:1] and DS[0:1] pins. The adjustable
phase feature allows the user to skew the outputs to lead or lag
the reference clock. Any one of the outputs can be connected to
feedback to achieve different reference frequency multiplication,
and divide ratios and zero input-output delay.
The device also features split output bank power supplies, which
enable the user to run two banks (1Qn and 2Qn) at a power
supply level, different from that of the other two banks (3Qn and
4Qn). The three-level PE/HD pin also controls the synchroni-
zation of the output signals to either the rising, or the falling edge
of the reference clock and selects the drive strength of the output
buffers. The high drive option (PE/HD = MID) increases the
output current from ± 12 mA to ± 24 mA.
PE/HD
TEST
FS
3
3
REF
FB
2F1:0
1F1:0
3F1:0
4F1:0
1Q0
1Q1
2Q0
2Q1
3Q0
3Q1
4Q0
4Q1
PLL
3
3
3
3
3
3
3
3
Phase
Select
Phase
Select
Phase
Select
and /K
3
sOE#
VDDQ1
VDDQ4
LOCK
/N
3
3
/R
3
PD#/DIV
DS1:0
Phase
Select
and /M
VDDQ3
Logic Block Diagram
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