ICS841S02I Datasheet, PDF (1/17 Pages) Integrated Device Technology – PCI EXPRESS™ CLOCK GENERATOR

PCI EXPRESS™ CLOCK GENERATOR
PRELIMINARY
ICS841S02I
GENERAL DESCRIPTION
The ICS841S02I 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 ICS841S02I is available in both standard and lead-free
20-Lead TSSOP packages.
FEATURES
• Two 0.7V current mode differential HCSL output pairs
• Crystal oscillator interface, 25MHz
• Output frequency: 100MHz
• RMS period jitter: 3ps (maximum)
• Output skew: 35ps (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
• -40°C to 85°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
SRCT[1:2]
SRCC[1:2]
PIN ASSIGNMENT
VSS_SRC ₁
VDD_SRC 2
SRCT2 3
SRCC2 4
SRCT1 5
SRCC1 6
VSS_SRC 7
VDD_SRC 8
VSS_SRC 9
IREF 10
20 ^VDD_SRC
19 SDATA
18 SCLK
17 ^nc
16 XTAL_OUT
15 XTAL_IN
14 VDD_REF
13 VSS_REF
12 VDDA
11 VSSA
ICS841S02I
20-Lead TSSOP
6.5mm x 4.4mm 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
ICS841S02BGI REV. C NOVEMBER 1, 2007