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Integrated Device Technology Electronic Components Datasheet



ICS841S01

PCI EXPRESS CLOCK GENERATOR


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ICS841S01 pdf
PCI EXPRESS™ CLOCK GENERATOR
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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
VDD_SRC
SRCT0
SRCC0
VDD_SRC
VSS_SRC
IREF
VSSA
1
2
3
4
5
6
7
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/ ICSPCI EXPRESS CLOCK GENERATOR
1
ICS841S01BG REV. B MAY 23, 2007



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ICS841S01 pdf
ICS841S01
PCI EXPRESS™ CLOCK GENERATOR
www.DPatRaSEhLeeItM4UIN.coAmRY
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 6
2, 5, 16
3, 4
VSS_SRC
V
DD_SRC
SRCT0, SRCC0
Power
Power
Output
Ground for core and SRC outputs.
Power supply for core and SRC outputs.
Differential output pair. HCSL interface levels.
A fixed precision resistor (475Ω) from this pin to ground provides a
7
IREF
Input
reference current used for differential current-mode SRCC0, SRCT0
clock outputs.
8
VSSA
Power
Analog ground pin.
9
VDDA
Power
Power supply for PLL.
10
VSS_REF
Power
Ground for crystal interface
11
VDD_REF
Power
12,
13
XTAL_IN, XTAL_OUT Input
Power supply for crystal interface.
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
SMBus compatible SCLK. This pin has an internal pullup resistor, but
14
SCLK
Input Pullup is in high impedance in powerdown mode.
LVCMOS/LVTTL interface levels.
15
SDATA
Input/
Output
SMBus compatible SDATA. This pin has an internal pullup resistor,
Pullup but is in high impedance in powerdown mode.
LVCMOS/LVTTL interface levels.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLUP
COUT
Parameter
Input Capacitance
Input Pullup Resistor
Output Pin Capacitance
Test Conditions
Minimum
Typical
4
51
4
Maximum
Units
pF
kΩ
pF
IDT/ ICSPCI EXPRESS CLOCK GENERATOR
2
ICS841S01BG REV. B MAY 23, 2007



Part Number ICS841S01
Description PCI EXPRESS CLOCK GENERATOR
Maker Integrated Device Technology - Integrated Device Technology
Total Page 16 Pages
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