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SL28PCIe25ALCT датащи(PDF) 8 Page - Silicon Laboratories

номер детали SL28PCIe25ALCT
подробное описание детали  Integrated voltage regulator
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SL28PCIe25ALCT датащи(HTML) 8 Page - Silicon Laboratories

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SL28PCIe25
DOC#: SP-AP-0776 (Rev. 0.2)
Page 8 of 16
Byte 13: Control Register 13
Byte 14: Control Register 14
.
PD# (Power down) Clarification
The CKPWRGD/PD# pin is a dual-function pin. During initial
power up, the pin functions as CKPWRGD. Once CKPWRGD
has been sampled HIGH by the clock chip, the pin assumes
PD# functionality. The PD# pin is an asynchronous active
LOW input used to shut off all clocks cleanly before shutting
off power to the device. This signal is synchronized internally
to the device before powering down the clock synthesizer. PD#
is also an asynchronous input for powering up the system.
When PD# is asserted LOW, clocks are driven to a LOW value
and held before turning off the VCOs and the crystal oscillator.
PD# (Power down) Assertion
When PD is sampled HIGH by two consecutive rising edges
of SRCC, all single-ended outputs will be held LOW on their
next HIGH-to-LOW transition and differential clocks must held
LOW. When PD mode is desired as the initial power on state,
PD must be asserted HIGH in less than 10
s after asserting
CKPWRGD.
PD# Deassertion
The power up latency is less than 1.8 ms. This is the time from
the deassertion of the PD# pin or the ramping of the power
supply until the time that stable clocks are generated from the
clock chip. All differential outputs stopped in a three-state
condition, resulting from power down are driven high in less
than 300
s of PD# deassertion to a voltage greater than
200 mV. After the clock chip’s internal PLL is powered up and
locked, all outputs are enabled within a few clock cycles of
each clock. Figure 2 is an example showing the relationship of
clocks coming up.
Bit
@Pup
Name
Description
7
1
REF_Bit2
Drive Strength Control - Bit[2:0] , Note: Slew Rate REF Bit1 is located in Byte 6 Bit 5
Normal mode default ‘101’
Wireless Friendly Mode default to ‘111’
61
REF_Bit0
5
1
RESERVED
4
1
RESERVED
3
1
RESERVED
2
1
RESERVED
1
0
RESERVED
RESERVED
0
0
Wireless Friendly mode
Wireless Friendly Mode
0 = Disabled, Default all single-ended clocks slew rate config bits to ‘101’
1 = Enabled, Default all single-ended clocks slew rate config bits to ‘111’
Bit
@Pup
Name
Description
7
1
RESERVED
RESERVED
6
0
RESERVED
RESERVED
5
1
RESERVED
RESERVED
40
OTP_4
OTP_ID
Idenification for programmed device
30
OTP_3
21
OTP_2
10
OTP_1
00
OTP_0
Table 4. Output Driver Status
All Differential Clocks
Clock
Clock#
PD# = 0 (Power down)
Low
Low


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