PI6C484321 Datasheet, PDF (1/9 Pages) Pericom Semiconductor Corporation – 260MHz Crystal-to-3.3V Differential LVPECL Frequency Synthesizer

PI6C484321
260MHz Crystal-to-3.3V Differential
LVPECL Frequency Synthesizer
Product Features
• Dual differential 3.3V LVPECL outputs
• Selectable crystal oscillator interface or LVCMOS/LVTTL
TEST_CLK
• Output frequency range: 53.33MHz to 366.67MHz
• Crystal input frequency range: 14MHz to 40MHz
• TEST_CLK freqeuncy range: 10MHz to 50MHz
• VCO range: 320MHz to 1.1GHz
• Parallel or serial interface for programming counter and
output dividers
• RMS period jitter: 3ps (typical)
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Packages (Pb-free & Green available):
- 32-pin LQFP (FB)
Description
The PI6C484321 is a dual output, 3.3V LVPECL Frequency Syn-
thesizer using crystal as the input source. The input source is can
be selected from either LVTTL/LVCMOS level input (TEST_CLK
pin) or crystal inputs. The VCO operates at a frequency range of
320MHz to 1.1GHz. The VCO frequency is programmed in steps
equal to the value of the input reference or crystal frequency. The
VCO and output frequency can be programmed through a simple
2-wire serial interface or through 11-bit parallel interface. The low
phase noise characteristics of the PI6C484321 make it an ideal
clock source for Fibre Channel 1 (FC1), Fibre Channel 2 (FC2), 10
Gigabit Fibre Channel (10GFC), Gigabit Ethernet and 10 Gigabit
Ethernet (10GbE) applications.
Block Diagram
VCO_SEL
XTAL_SEL
TEST_CLK
XTAL1
XTAL2
0
OSC ¹
MR
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
M0:M8
N0:N1
PLL
PHASE DETECTOR
VCO
?÷M
÷3
0
÷4
÷5
1
÷6
CONFIGURATION
INTERFACE
LOGIC
Pin Configuration
FOUT0
nFOUT0
FOUT1
nFOUT1
TEST
32 31 30 29 28 27 26 25
M5 1
M6 2
M7 3
M8 4
N0 5
N1 6
nc 7
VEE 8
24 XTAL2
23 TEST_CLK
22 XTAL_SEL
2 1 VCCA
20 S_LOAD
19 S_DATA
18 S_CLOCK
17 MR
9 10 11 12 13 14 15 16
PS8765A
08/01/05
1