PRELIMINARY
FEMTOCLOCK™ CRYSTAL-TO-
LVPECL/LVDS/LVCMOS CLOCK GENERATOR
ICS843S2807
GENERAL DESCRIPTION
FEATURES
ICS843S2807 is a low phase noise Clock Generator
• Five banks of outputs:
ICS
HiPerClockS™
and is a member of the HiperClockS™family of high
performance clock solutions from IDT. The device
provides five banks of outputs and a reference clock.
The banks can be enabled by using a common output
Bank A: one single-ended (QA0) LVCMOS output at: 133MHz
and one (QA1/nQA1) LVPECL output at: 66.67MHz, 100MHz
and 125MHz
Bank B: two (QB0, QB1) LVCMOS outputs at: 50MHz
Bank C: one (QC0/nQC0) differential LVPECL output at: 87.5MHz
Bank D: one (QD0/nQD0) differential LVDS output at: 350MHz
One single-ended LVCMOS reference clock output at: 25MHz
enable pin. A 25MHz crystal is used to generate the 50MHz,
66.67MHz, 87.5MHz, 100MHz, 125MHz, 133MHz and 350MHz
frequencies.
• Crystal input frequency: 25MHz
• Maximum output frequency: 350MHz
PIN ASSIGNMENT
•
5ꢀ frequency margining
• Full 3.3V operating supply
• 0°C to 70°C ambient operating temperature
32 31 30 29 28 27 26 25
• Available in both standard (RoHS 5) and lead-free (RoHS6)
packages
1
2
3
4
5
6
7
8
24
23
22
21
20
19
F_SEL0
F_SEL1
VCC
VCC
QA1
nQA1
ICS843S2807
32-Lead LQFP
7mm x 7mm x 1.4mm
package body
Y Package
XTAL_IN
XTAL_OUT
VEE
VCCA1
VEE
BLOCK DIAGRAM
LVCMOS - 25MHz
QC0
REF_OUT
18 nQC0
Top View
VCCA2
RESET
VCC
17
LVCMOS - 133MHz
QA0
÷5.2631
9
10 11 12 13 14 15 16
2
Pullup
F_SEL[1:0]
Pulldown
PLL_BYPASS
1
LVPECL - 66.67/100/
125MHz
25MHz
XTAL_IN
QA1
VCO
700MHz
÷5.6,
÷7,
÷10.5
Phase
Detector
OSC
0
nQA1
XTAL_OUT
LVCMOS - 50MHz
QB0
÷28
÷14
QB1
5ꢀ
Frequency
Margining
LVPECL - 87.5MHz
QC0
÷8
÷2
nQC0
LVDS - 350MHz
QD0
Pulldown
MARGIN
nQD0
Pulldown
Pulldown
Pullup
MARGIN_MODE
RESET
OE
The Preliminary Information presented herein represents a product in pre-production.The noted characteristics are based on initial product characterization
and/or qualification.Integrated DeviceTechnology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™ LVPECL/LVDS/LVCMOS CLOCK GENERATOR
1
ICS843S2807BY REV. A JANUARY 30, 2008