ICS84021 Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – 260MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS84021
260MHZ, CRYSTAL-TO-LVCMOS / LVTTL
FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
ICS
The ICS84021 is a general purpose, Crystal-to-
LVCMOS/LVTTL High Frequency Synthesizer
HiPerClockS™ _{and a member of the HiPerClockS™ family of}
High Performance Clock Solutions from ICS. The
ICS84021 has a selectable TEST_CLK or crys-
tal input. The VCO operates at a frequency range of 620MHz
to 780MHz. 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 using
the serial or parallel interface to the configuration logic. The
low phase noise characteristics of the ICS84021 make it an
ideal clock source for Gigabit Ethernet, SONET, Fibre Chan-
nel 1 and 2, and Infiniband applications.
FEATURES
• 2 LVCMOS/LVTTL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL TEST_CLK
• Output frequency range: 103.3MHz to 260MHz
• Crystal input frequency range: 14MHz to 40MHz
• VCO range: 620MHz to 780MHz
• Parallel or serial interface for programming counter
and output dividers
• RMS period jitter: 4.3ps (typical) (N ÷ 4, V_DDO = 3.3V ± 5%)
• RMS phase jitter at 155.52MHz, using a 38.88MHz crystal
(12KHz to 20MHz): 2.88ps (typical)
Phase noise: 155.52MHz
Offset
Noise Power
100Hz ................. -93.7 dBc/Hz
1KHz ............... -111.3 dBc/Hz
10KHz ............... -120.4 dBc/Hz
100KHz ............... -125.1 dBc/Hz
• Full 3.3V or mixed 3.3V core/2.5V or 1.8V supply voltage
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
BLOCK DIAGRAM
PIN ASSIGNMENT
OE0
OE1
VCO_SEL
XTAL_SEL
TEST_CLK
XTAL1
XTAL2
0
OSC
1
MR
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
PLL
PHASE DETECTOR
VCO
0
÷3
÷4
÷M
1
÷5
÷6
CONFIGURATION
INTERFACE
LOGIC
M5
M6
M7
M8
N0
N1
nc
GND
32 31 30 29 28 27 26 25
1
24
2
23
3
22
4
ICS84021 ²¹
5
20
6
19
7
18
8
17
9 10 11 12 13 14 15 16
XTAL2
TEST_CLK
XTAL_SEL
VDDA
S_LOAD
S_DATA
S_CLOCK
MR
Q0
Q1
TEST
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
M0:M8
N0:N1
84021AY
www.icst.com/products/hiperclocks.html
1
REV. A NOVEMBER 7, 2003