ICS843101-312 Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVPECL 312.5MHZ FREQUENCY MARGINING SYNTHESIZER

ADVANCE INFORMATION
Integrated
ICS843101-312
Circuit
Systems, Inc.
FEMTOCLOCKS™ CRYSTAL-TO-LVPECL
312.5MHZ FREQUENCY MARGINING SYNTHESIZER
GENERAL DESCRIPTION
The ICS843101-312 is a low phase-noise
ICS
frequency margining synthesizer with fre-
HiPerClockS™ _{quency margining capability and is a member of}
the HiPerClockS™ family of high performance
clock solutions from ICS. In the default mode,
the device nominally generates a 312.5MHz LVPECL 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 interface, to vary the
output frequency up or down from nominal in 2% steps.
The ICS843101-312 is provided in a 16-pin TSSOP.
FEATURES
• One 312.5MHz nominal LVPECL 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): <1ps (typical) design target
• Output supply modes
Core/Output
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
• 0°C to 70°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
VEE 1
S_LOAD 2
S_DATA 3
Q S_CLOCK 4
SEL 5
nQ
OE 6
VCCA 7
VCC 8
16 MODE
15 VCCO
14 Q
13 nQ
12 VEE
11 CLK
10 XTAL_OUT
9 XTAL_IN
ICS843101-312
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
The Advance Information presented herein represents a product currently in design or being considered for design. The noted characteristics are
design targets. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
843101AG-312
www.icst.com/products/hiperclocks.html
OCTOBER 18, 2005
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