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Número de pieza | PI6C49018 | |
Descripción | Low Power Networking Clock Generator | |
Fabricantes | Pericom Semiconductor | |
Logotipo | ||
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No Preview Available ! PI6C49018
Low Power Networking Clock Generator
Features
ÎÎ25 MHz crystal or clock input
ÎÎFour differential 100 MHz PCI-Express clock outputs – Low
power HCSL
ÎÎSpread spectrum capability on all 100 MHz PCI-e clock
outputs with -0.5% down spread
ÎÎOne single-ended 66.66 MHz output
ÎÎOne single-ended 125 MHz output for Gigabit Ethernet at
2.5V
ÎÎOne single-ended 80 MHz output with selectable down
spread
ÎÎ40-pin TQFN package
ÎÎOperating voltage 3.3 V ±5%
ÎÎIndustrial temperature (-40 to +85°C)
Description
The PI6C49018 is a clock generator device intended for PCI-
Express/networking applications. The device includes four 100
MHz differential outputs for PCI-Express with low power HCSL
structure, one CMOS 125 MHz output, and one CMOS 66.66
MHz, and one CMOS 80 MHz output with spread spectrum.
Using a serially programmable SMBus interface, the PI6C49018
incorporates spread spectrum modulation on the four 100 MHz
PCI-Express outputs with -0.5% down spread and the 80 MHz
output with selectable down spread.
Block Diagram
14-0209
1 www.pericom.com
PI6C49018
Rev. A
12/10/2014
1 page PI6C49018
Low Power Networking Clock Generator
Serial Data Interface (SMBus)
This part is a slave only SMBus device that supports indexed block read and indexed block write protocol using a single 7-bit ad-
dress and read/write bit as shown below.
Address Assignment
A6 A5 A4 A3 A2 A1 A0 W/R
1 1 0 1 0 0 1 0/1
How to Write
1 bit 8 bits
Start
bit
D2H
1 8 bits 1
8 bits
1 8 bits 1
8 bits
1
Ack
Register
offset
Ack
Byte Count
=N
Ack
Data Byte
0
Ack
…
Data Byte
N-1
Ack
1 bit
Stop
bit
Note:
1.
Register offset for indicating the starting register for indexed block write and indexed block read. Byte Count in write mode cannot be 0.
How to Read (M: abbreviation for Master or Controller; S: abbreviation for slave/clock)
1 bit 8 bits 1 bit 8 bits 1 bit 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit … 8 bits
M: send
M: M:
S: starting S:
M:
Start Send sends databyte sends Start
bit "D2h" Ack location: Ack bit
N
M:
Send
"D3h"
S:
sends
Ack
S:
sends
# of
data
bytes
that
will
be
sent:
X
M:
sends
Ack
S:
sends
start-
ing
data
byte
N
M:
sends
Ack
S:
sends
… data
byte
N+X-1
1 bit
M:
Not
Ac-
knowl-
edge
1 bit
M:
Stop
bit
Byte 0: Spread Spectrum Control Register
Bit Description
Type
7
Spread Select for 100 MHz push-pull
PCI-Express clocks
RW
6
Enables hardware or software control of OE bits
(see Byte 0-Bit 6 and Bit 5 Functionality table)
RW
Software PD_RESET bit. Enables or disables all out-
5 puts. RW
(see Byte 0-Bit 6 and Bit 5 Functionality table)
4
Spread Select for 80MHz SS1
RW
3
Spread Select for 80MHz SS0
RW
2
OE for 66.66 MHz output
RW
1 Reserved R
0
OE for single-ended 125MHz
RW
Power Up
Condition
0
0
Output(s)
Affected
All 100MHz PCI-
Express outputs
PD_RESET, bit 5
1 All outputs
Notes
0=spread off
1 = -0.5% down
spread
0 = hardware cntl
1 = software ctrl
0 = disabled
1 = enabled
0 80M See Table 1 on Page4
1
1
66.66M
0 = disabled
1 = enabled
--
-
1
Single-ended 125MHz
0 = disabled
1 = enabled
14-0209
5 www.pericom.com
PI6C49018
Rev. A
12/10/2014
5 Page PI6C49018
Low Power Networking Clock Generator
Application Notes
Crystal circuit connection
The following diagram shows PI6C49018 crystal circuit connection with a parallel crystal. For the CL=18pF crystal, it is suggested
to use C1= 27pF, C2= 27pF. C1 and C2 can be adjusted to fine tune to the target ppm of crystal oscillator according to different
board layouts.
Crystal Oscillator Circuit
SaRonix-eCera
FL2500047
C1
27pF
Crystal�(CL�=�18pF)
XTAL_IN
C2
27pF
XTAL_OUT
Recommended Crystal Specification
Pericom recommends:
a) FY2500081, SMD 5x3.2(4P), 25M, CL=18pF, +/-30ppm, http://www.pericom.com/pdf/datasheets/se/FY_F9.pdf
b) FL2500047, SMD 3.2x2.5(4P), 25M, CL=18pF, +/-20ppm, http://www.pericom.com/pdf/datasheets/se/FL.pdf
14-0209
11 www.pericom.com
PI6C49018
Rev. A
12/10/2014
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet PI6C49018.PDF ] |
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