ICS844101I-312 Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVDS 312.5MHZ FREQUENCY MARGINING SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844101I-312
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
312.5MHZ FREQUENCY MARGINING SYNTHESIZER
GENERAL DESCRIPTION
The ICS844101I-312 is a low phase-noise
ICS
frequency margining synthesizer and is a mem-
HiPerClockS™ _{ber of the HiPerClock S™ family of high perfor-}
mance clock solutions from ICS. In the default
mode, the device nominally generates a
312.5MHz LVDS output clock signal from a 25MHz crystal
input. There is also a frequency margining mode available
where the device can be programmed, using the serial in-
terface, to vary the output frequency up or down from nomi-
nal in 2% steps. The ICS844101I-312 is provided in a 16-
pin TSSOP.
FEATURES
• One 312.5MHz nominal LVDS output
• Selectable crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal or LVCMOS single-ended
input
• Output frequency can be varied in 2% steps ± from nominal
• VCO range: 560MHz - 690MHz
• RMS phase jitter @ 312.5MHz, using a 25MHz crystal
(1.875MHz-20MHz): 0.52ps (typical)
• Output supply modes
Core/Output
3.3V/3.3V
3.3V/2.5V
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS-complaint
packages
BLOCK DIAGRAM
OE ^Pullup
CLK ^Pulldown
1
25MHz
÷P
XTAL_IN
OSC
0
XTAL_OUT
SEL ^Pulldown
Phase
VCO
÷N
Detector
560 - 690MHz
÷M
S_CLOCK
S_DATA
S_LOAD
MODE
Pulldown
Pulldown
Pulldown
Pulldown
Serial Control
PIN ASSIGNMENT
GND 1
S_LOAD 2
S_DATA 3
Q S_CLOCK 4
SEL 5
nQ
OE 6
VDDA 7
VDD 8
16 MODE
1 5 VDDO
14 Q
13 nQ
12 GND
11 CLK
10 XTAL_OUT
9 XTAL_IN
ICS844101I-312
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on
initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications
without notice.
844101AGI-312
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 28, 2005
1