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Integrated Circuit Systems

ICS873990 Datasheet Preview

ICS873990 Datasheet

LOW VOLTAGE LVCMOS/ CRYSTAL-TO-LVPECL/ECL CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
ICS873990www.DataSheet4U.com
LOW VOLTAGE, LVCMOS/
CRYSTAL-TO-LVPECL/ECL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS873990 is a low voltage, low skew, 3.3V
LVPECL/ECL Clock Generator and a member
HiPerClockS™ of the HiPerClockS™ family of High Performance
Clock Solutions from ICS. The ICS873990 has
two selectable clock inputs. The XTAL1 and
XTAL2 are used to interface to a crystal and the TEST_CLK
pin can accept a LVCMOS or LVTTL input. This device has a
fully integrated PLL along with frequency configurable out-
puts. An external feedback input and output regenerates
clocks with “zero delay”.
The four independent banks of outputs each have their own
output dividers, which allow the device to generate a multi-
tude of different bank frequency ratios and output-to-input
frequency ratios. The output frequency range is 25MHz to
400MHz and the input frequency range is 6.25MHz to
125MHz. The PLL_SEL input can be used to bypass the PLL
for test and system debug purposes. In bypass mode, the
input clock is routed around the PLL and into the internal out-
put dividers.
The ICS873990 also has a SYNC output which can be used
for system synchronization purposes. It monitors Bank A and
Bank C outputs for coincident rising edges and signals a pulse
per the timing diagrams in this data sheet. This feature is used
primarily in applications where Bank A and Bank C are run-
ning at different frequencies, and is particularly useful when
they are running at non-integer multiples of each other.
FEATURES
14 differential LVPECL outputs
Selectable crystal oscillator interface or TEST_CLK inputs
TEST_CLK accepts the following input levels:
LVCMOS, LVTTL
Output frequency: 400MHz (maximum)
Crystal input frequency range: 10MHz to 25MHz
VCO range: 200MHz to 800MHz
Output skew: 250ps (maximum)
Cycle-to-cyle jitter: ±50ps (typical)
LVPECL mode operating voltage supply range:
V = 3.135V to 3.465V, V = 0V
CC EE
ECL mode operating voltage supply range:
V = 0V, V = -3.465V to -3.135V
CC EE
0°C to 70°C ambient operating temperature
Industrial temperature available upon request
Lead-Free package fully RoHS compliant
PIN ASSIGNMENT
Example Applications:
1. Line Card Multiplier: Multiply 19.44MHz from a back-plane
to 77.76MHz on the line card ASIC and Serdes.
2. Zero Delay Buffer: Fan out up to thirteen 100MHz copies
from a reference clock to multiple processing units on an
embedded system.
nQB3
QB3
VCCO
nQA0
QA0
nQA1
QA1
nQA2
QA2
nQA3
QA3
SYNC_SEL
VCO_SEL
39 38 37 36 35 34 33 32 31 30 29 28 27
40 26
41 25
42 24
43 23
44 22
45 21
46 ICS873990 20
47 19
48 18
49 17
50 16
51 15
52 14
1 2 3 4 5 6 7 8 9 10 11 12 13
QC1
nQC1
QC0
nQC0
VCCO
QD1
nQD1
QD0
nQD0
VCCO
QFB
nQFB
VCCA
873990AY
52-Lead LQFP
10mm x 10mm x 1.4mm package body
Y package
Top View
www.icst.com/products/hiperclocks.html
1
REV. B JUNE 13, 2005




Integrated Circuit Systems

ICS873990 Datasheet Preview

ICS873990 Datasheet

LOW VOLTAGE LVCMOS/ CRYSTAL-TO-LVPECL/ECL CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
BLOCK DIAGRAM
VCO_SEL Pulldown
PLL_EN Pulldown
REF_SEL Pulldown
TEST_CLK Pulldown
XTAL_IN
XTAL_OUT
XTAL
OSC
EXT_FB
nEXT_FB
MR Pulldown
FSEL_0:3 Pulldown
FSEL_FB0:2 Pulldown
SYNC_SEL Pulldown
ICS873990www.DataSheet4U.com
LOW VOLTAGE, LVCMOS/
CRYSTAL-TO-LVPECL/ECL CLOCK GENERATOR
PHASE
DETECTOR
LPF
VCO
FREQUENCY
GENERATOR
SYNC
QA0
nQA0
QA1
nQA1
QA2
nQA2
QA3
nQA3
QB0
nQB0
QB1
nQB1
QB2
nQB2
QB3
nQB3
QC0
nQC0
QC1
nQC1
QC2
nQC2
QD0
nQD0
QD1
nQD1
QFB
nQFB
873990AY
www.icst.com/products/hiperclocks.html
2
REV. B JUNE 13, 2005


Part Number ICS873990
Description LOW VOLTAGE LVCMOS/ CRYSTAL-TO-LVPECL/ECL CLOCK GENERATOR
Maker Integrated Circuit Systems
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