INDEX
PRELIMINARY
MX8335
RAMBUS CLOCK GENERATOR
FEATURES
鈥?Clock generator for Rambus
TM
Channel
鈥?Provide two Rambus interface-level outputs with
frequency from 200MHz to 267MHz
鈥?Multiplication ratio 40/3 allows low cost crystal used
as frequency reference
鈥?Provide chip output enable pin (EN) for tri-state
control
鈥?3.0V~3.6V power supply range
鈥?8-pin SOP (150mil) package
GENERAL DESCRIPTION
The MX8335 is a clock synthesizer chip for Rambus
channel. With an advanced phase locked loop technol-
ogy, the MX8335 provides two clock outputs (CLKOUT)
with frequency ranging from 200MHz to 267MHz. The
desired high speed clock is the 40/3 Multiplication ratio
of a reference input clock. The reference clock could
be supplied by an external crystal ranging from 15MHz
to 20MHz.
PIN CONFIGURATIONS
8-PIN SOP
PIN DESCRIPTION
SYMBOL PIN TYPE PIN NUMBER
EN
I
1
DESCRIPTION
When high, CLKOUTs are
enabled.
When low, CLKOUTs are
tristate.
EN
XO
XI
GND
1
2
3
4
8
VDD
CLKOUT
GND
CLKOUT
XO
XI
GND
CLKOUT O
GND
CLKOUT O
VDD
O
I
2
3
4
5
6
7
8
MX8335
7
6
5
With an internal pull high
resistor.
Crystal output pin.
Crystal input pin.
Ground.
200-267Mhz output.
Ground.
200-267Mhz output.
Power supply.
BLOCK DIAGRAM
DIVIDER
梅40
200MHz~267MHz
XO
15MHz~20MHz
XI
OSC
DIVIDER
梅3
PFC
CHARGE
PUMP
VCO
200MHz~267MHz
VDD
LOOP
FILTER
EN
Rambus and
P/N: PM0334
are trademarks of Rambus Inc.
REV. 1.4, APR. 15, 1996
1