12-August-2014
Si5347/46, Si5345/44/42, Si5341/40
Silicon Revision A1 Errata
Errata Status Summary
Errata #
1
2
3
4
5
6
Title
Output frequency limited to 710 MHz.
OSC startup issue w/ XTALs if Tj > 110 °C.
Input-to-Output delay is not consistent.
Output-to-Output skew is not consistent.
LVCMOS Hi-Z mode impedance too low.
LOS and OOF sticky status bits cannot be cleared.
Impact
Major
Major
Major
Major
Major
Minor
Status
May be fixed in a future revision.
Fixed in silicon revision B.
No workaround.
Will be fixed in a future revision.
No workaround.
Will be fixed in a future revision.
No workaround.
Will be fixed in a future revision.
No workaround.
Will be fixed in a future revision.
Impact definition: Each erratum is marked with an impact, as defined below:
Minor – Workaround exists.
Major – Errata that do not conform to the data sheet or standard.
Information – The device behavior is not ideal but acceptable. Typically, the data sheet
will be changed to match the device behavior.
This document applies to Ordering Part Numbers (OPNs) which refer to product
Revision A (silicon revision A1). For example: Si5345A-A-GM or Si5341A-Axxxxx-GM,
where xxxxx is the custom OPN ID.
Silicon revision B will have OPNs with B in the product revision. For example: Si5345A-
B-GM
or Si5341A-Bxxxxx-GM, where xxxxx is the custom OPN ID.
Si5347/46/45/44/42/41/40 Errata (A1)
Silicon Labs Confidential
Page 1
Errata Details
1.
Description:
The VCO operating frequency range limits the maximum generated clock output frequency.
Impact:
Frequencies can be generated up to 710 MHz and not 800 MHz as stated in the data sheet.
ClockBuilder Pro currently limits output frequencies to 710 MHz.
Workaround:
There is no workaround for this issue at this time.
Resolution:
This limitation may be fixed in a future revision.
Description:
The oscillator circuit (OSC) may not start up when running the chip at high temperatures. The
ESD protection circuit on XA/XB interacts with an internal regulator for the OSC circuit at start up.
The problem occurs when the junction temperature is above 110 °C.
Impact:
If the chip is powered-up, or a hard or soft reset is performed at high temperatures, the DSPLL
will not be able to achieve lock and output clocks will not be generated.
Workaround:
There is no workaround for this issue. Refer to
ClockBuilder Pro’s
power dissipation report to help
determine your design’s effective junction temperature.
Resolution:
This issue is fixed in silicon revision B.
2.
Description:
The input-to-output delay is not consistent when running the chip at high temperatures. The
problem occurs when the junction temperature is above 110 °C.
Impact:
If the chip is powered-up, or a hard or soft reset is performed at high temperatures, the input-to-
output delay may exceed the data sheet specification.
Workaround:
There is no workaround for this issue.
Resolution:
This erratum will be fixed in a future revision.
Si5347/46/45/44/42/41/40 Errata (A1)
Silicon Labs Confidential
Page 2
3.
Description:
The output-to-output delay is not consistent when running the chip at high temperatures. The
problem occurs when the junction temperature is above 110 °C.
Impact:
If the chip is powered-up, or a hard or soft reset is performed at high temperatures, the output-to-
output delay may exceed the data sheet specification of 100 ps.
Workaround:
There is no workaround for this issue.
Resolution:
This erratum will be fixed in a future revision.
4.
Description:
An LVCMOS output can be configured to disable in a low logic state, a high logic state, or in
high-impedance mode. The disable in high-impedance state does not meet the data sheet
specification.
Impact:
The LVCMOS high-impedance mode should not be used.
Workaround:
Select the disable state as stop-high or stop-low.
Resolution:
This erratum will be fixed in a future revision.
5.
Description:
LOS and OOF sticky status bits cannot be cleared unless its fault monitor is disabled.
Impact:
LOS and OOF sticky (flag) bits will always remain set whenever asserted. Clearing the sticky
bit(s) will have no effect.
Workaround:
It is possible to clear a sticky bit by temporarily disabling its fault monitor. Once disabled, the bit
can be cleared and the fault monitor re-enabled.
Resolution:
This erratum will be fixed in a future revision.
Si5347/46/45/44/42/41/40 Errata (A1)
Silicon Labs Confidential
Page 3
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