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PDF ICS841S01 Data sheet ( Hoja de datos )
| Número de pieza | ICS841S01 | |
| Descripción | PCI EXPRESS CLOCK GENERATOR | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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PCI EXPRESS™ CLOCK GENERATOR
www.DataSheet4U.com
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™ / ICS™ PCI EXPRESS CLOCK GENERATOR
1
ICS841S01BG REV. B MAY 23, 2007
1 page  
ICS841S01
PCI EXPRESS™ CLOCK GENERATOR
TABLE 4B. BYTE 1:CONTROL REGISTER 1
BIT @Pup
70
60
50
40
30
20
10
00
Name
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Description
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
TABLE 4D. BYTE 3:CONTROL REGISTER 3
BIT @Pup
71
60
51
40
31
21
11
01
Name
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Description
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
TABLE 4F. BYTE 5:CONTROL REGISTER 5
BIT @Pup
70
60
50
40
30
20
10
00
Name
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Description
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
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TABLE 4C. BYTE 2:CONTROL REGISTER 2
BIT @Pup Name Description
7
1
SRCT/C
Spread Spectrum Selection
0 = -0.35%, 1 = -0.50%
6 1 Reserved Reserved
5 1 Reserved Reserved
4 0 Reserved Reserved
3 1 Reserved Reserved
20
SRC
SRC Spread Spectrum Enable
0 = Spread Off, 1 = Spread On
1 1 Reserved Reserved
0 1 Reserved Reserved
TABLE 4E. BYTE 4:CONTROL REGISTER 4
BIT @Pup
70
60
50
40
30
20
10
01
Name
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Description
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
IDT™ / ICS™ PCI EXPRESS CLOCK GENERATOR
5
ICS841S01BG REV. B MAY 23, 2007
5 Page 
ICS841S01
PCI EXPRESS™ CLOCK GENERATOR
RECOMMENDATIONS FOR UNUSED INPUT PINS
INPUTS:
LVCMOS CONTROL PINS
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1kΩ resistor can be used.
OUTPUT DRIVER CURRENT
The ICS841S01 outputs are HCSL current drive with the cur-
rent
being
set
with
a
resistor
from
I
REF
to
ground.
For
a
50Ω
pc
board trace, the drive current would typically be set with a RREF
of 475Ω which products an IREF of 2.32mA. The IREF is multiplied
by a current mirror to an output drive of 6*2.32mA or 13.92mA.
See Figure 3 for current mirror and output drive details.
IREF
RREF
RL
RL
FIGURE 3. HCSL CURRENT MIRROR AND OUTPUT DRIVE
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IDT™ / ICS™ PCI EXPRESS CLOCK GENERATOR
11
ICS841S01BG REV. B MAY 23, 2007
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ICS841S01.PDF ] | |
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