參數(shù)資料
型號: SL28PCIE50ALIT
廠商: Silicon Laboratories Inc
文件頁數(shù): 15/16頁
文件大?。?/td> 0K
描述: IC CLOCK PCIE GEN2 48QFN
標(biāo)準(zhǔn)包裝: 2,500
系列: EProClock®
類型: *
PLL: 帶旁路
輸入: 時鐘,晶體
輸出: 時鐘
電路數(shù): 1
比率 - 輸入:輸出: 1:10
差分 - 輸入:輸出: 無/是
頻率 - 最大: 100MHz
除法器/乘法器: 無/是
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: *
封裝/外殼: *
供應(yīng)商設(shè)備封裝: *
包裝: *
SL28PCIe50
DOC#: SP-AP-0758 (Rev. AA)
Page 8 of 16
Input Pins Clearification
SRC_EN Clarification
SRC_EN pin is a 3.3V active high input pin. When the
SRC_EN signal is a logic low, all SRC clocks will be disabled
sychronously regardless of the CLKREQ# state. If SRC_EN
pin remains disabled it can be re-enabled through the SMBus
register. The SRC_EN signal will be asserted high whenever
the SRC_EN pin or the SRC_EN bit is a logic high.
CLKREQ# Clarification
The CLKREQ# signals are active low inputs used to cleanly
enable and disabe selected SRC outputs. If CLKREQ# pin
remains disabled it can be re-enabled through the SMBus
register. The CLKREQ# signal will be asserted high whenever
the CLKREQ# pin or the CLKREQ# bit is a logic high.
OE Clarification
The OE signals are active high inputs used to enable and
disabe single-ended outputs. If OE pin remains disabled it can
be re-enabled through the SMBus register. The OE signal will
be asserted high whenever the OE pin or the OE bit is a logic
high. OE pins is required to be driven at all time.
RESET# Clarification
The RESET# signal is 3.3V output signal with an internal
100k-ohm pull-down. The RESET# output is low during power
up. When SRC_EN is low and after all SRC clocks go low,
RESET# will go low. If any of the SRCs is running when
SRC_EN is low, RESET# will not go low. When PD pin is
de-asserted and SRC_EN goes high, RESET# will remain low
for 100ms then goes high. If PD is asserted, RESET# will be
low.
Byte 7: Control Register 7
Bit
@Pup
Type
Name
Description
7
0
R/W
PLL2_SS_EN
Spread Enabled for PLL2
0=Spread Disabled; 1=Spread Enabled
6
0
R/W
CONFIG_SE1_FS2
See Table 6 on page 7 for full configuraiton
5
0
R/W
CONFIG_SE1_FS1
4
0
R/W
CONFIG_SE1_FS0
3
0
R/W
PLL1_PD
Power Down PLL1
0=Enabled PLL1; 1=Disabled PLL1
2
0
R/W
PLL2_PD
Power Down PLL2
0=Enabled PLL2; 1=Disabled PLL2
1
0
R/W
PLL3_PD
Power Down PLL3
0=Enabled PLL3; 1=Disabled PLL3
0
1
R/W
RESET#_SET
RESET# Output setting
0=RESET# output goes low, but will not disabled SRC clocks
1=RESET# goes high after 100ms if device is not in power
down or SRC_EN in not “0”
Table 4. CLKREQ# Table for SRC Clocks
CKPWRGD / PD#
SRC_EN Pin
SRC_EN Bit
CLKREQ# Pin
CLKREQ# Bit
SRC Clocks
11
X
0
X
Enabled
11
X
0
Enabled
1X
1
0
X
Enabled
1X
1
X
0
Enabled
1
0
Disabled if not free running
1
0
1
Disabled if not free running
1
0
1
0
Disabled if not free running
1
X
1
Disabled
0
X
Disabled
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