843204I-01 Datasheet, PDF (1/14 Pages) Integrated Device Technology – FemtoClock® Crystal-to-3.3V LVPECL Frequency Synthesizer

FemtoClock^® Crystal-to-3.3V LVPECL
Frequency Synthesizer
843204I-01
DATA SHEET
GENERAL DESCRIPTION
The 843204I-01 is a 4 output LVPECL Synthe-sizer optimized
to generate Gigabit Ethernet and SONET reference clock
frequencies and is a member of the HiPerClocks^TM family
of high perfor mance clock solutions from IDT. Using
a 19.44MHz and 25MHz, 18pF parallel resonant crystal,
155.52MHz and 156.25MHz frequencies can be generated.
The 843204I-01 uses IDT’s FemtoClock^TM low phase noise VCO
technology and can achieve 1ps or lower typical RMS phase jitter.
FEATURES
• Four 3.3V LVPECL outputs
• Selectable crystal oscillator interface or clock inputs
• Supports the following output frequencies: 155.52MHz
and 156.25MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal
(12kHz - 13MHz): 0.6ps (typical)
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.7ps (typical)
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package
• For functional replacement part us 8T49N285
BLOCK DIAGRAM
nPLL_BYPASS_A ^Pullup
IN_SELA ^Pullup
CLK0 ^Pulldown
25MHz
XTAL_IN0
XTAL_OUT0
OSC
nPLL_BYPASS_B ^Pullup
IN_SELB ^Pullup
CLK1 ^Pulldown
nCLK1 ^{Pullup/pulldown}
19.44MHz
XTAL_IN1
XTAL_OUT1
OSC
PLL
÷4
156.25MHz
625MHz
PLL
÷4
155.52MHz
622.08MHz
SELA0
OEA0
0
1
SELA1
OEA1
0
1
QA0
nQA0
QA1
nQA1
SELB0
OEB0
0
1
SELB0
OEB1
0
1
QB0
nQB0
QB1
nQB1
PIN ASSIGNMENT
nQA1 1
QA1 2
nQA0 3
QA0 4
nc 5
VCCO_A 6
SELA1 7
SELA0 8
nPLL_BYPASS_A 9
nc 10
nc 11
nc 12
nc 13
XTAL_IN1 14
XTAL_OUT1 15
CLK1 16
nCLK1 17
IN_SELB 18
VCCO_B 19
nc 20
QB0 21
nQB0 22
QB1 23
nQB1 24
48 IN_SELA
47 CLK0
46 XTAL_IN0
45 XTAL_OUT0
44 nc
43 VEE
42 OEA0
41 OEA1
40 VCC
39 VCCA
38 nPLL_BYPASS_B
37 nc
36 SELB0
35 VEE
34 OEB0
33 OEB1
32 VCC
31 SELB1
30 VCCA
29 nc
28 nc
27 nc
26 nc
25 nc
843204I-01
48 Lead TSSOP
6.1mm x 12.5mm x 0.925mm
package body
G Package
Top View
843204I-01 REVISION A 11/5/15
1
©2015 Integrated Device Technology, Inc.