ICS841S01 Datasheet, PDF (1/16 Pages) Integrated Device Technology – PCI EXPRESS™ CLOCK GENERATOR

PCI EXPRESS™ CLOCK GENERATOR
PRELIMINARY
ICS841S01
GENERAL DESCRIPTION
The ICS841S01 is a PLL-based clock generator
ICS
specifically designed for PCI_Express™Clock
HiPerClockS™ _{Generation applications. This device generates a}
100MHz HCSL clock. The device offers a HCSL
(Host Clock Signal Level) clock output from a clock
input reference of 25MHz. The input reference may be derived
from an external source or by the addition of a 25MHz crystal to
the on-chip crystal oscillator. An external reference may be applied
to the XTAL_IN pin with the XTAL_OUT pin left floating.
The device offers spread spectrum clock output for reduced EMI
applications. An I²C bus interface is used to enable or disable
spread spectrum operation as well as select either a down spread
value of -0.35% or -0.5%.
The ICS841S01 is available in both standard and lead-free
16-Lead TSSOP packages.
FEATURES
• One 0.7V current mode differential HCSL output pair
• Crystal oscillator interface, 25MHz
• Output frequency: 100MHz
• RMS period jitter: 3ps (maximum)
• Cycle-to-cyle jitter: 35ps (maximum)
• I²C support with readback capabilities up to 400kHz
• Spread Spectrum for electromagnetic interference (EMI)
reduction
• 3.3V operating supply mode
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
25MHz
XTAL_IN
OSC
XTAL_OUT
SDATA ^Pullup
SCLK ^Pullup
PLL
I²C
Logic
IREF
Divider
Network
SRCT0
SRCC0
PIN ASSIGNMENT
VSS_SRC 1
VDD_SRC 2
SRCT0 ³
SRCC0 4
VDD_SRC ⁵
VSS_SRC ⁶
IREF 7
VSSA ⁸
16 VDD_SRC
15 SDATA
14 SCLK
13 XTAL_OUT
12 XTAL_IN
11 VDD_REF
10 VSS_REF
9 VDDA
ICS841S01
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 pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT^™ / ICS^™ PCI EXPRESS CLOCK GENERATOR
1
ICS841S01BG REV. B MAY 23, 2007