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CY8C21x34
Errata Document
September 11, 2008 Document No. 001-48789 Rev. ** 2
CY8C21x34 Errata Summary
The following table defines the errata applicability to available CY8C21x34 family devices. An "X" indicates that the
errata pertains to the selected device.
Note Errata items, in the table below, are hyperlinked. Click on any item entry to jump to its description.
1. Internal Main Oscillator (IMO) Tolerance Deviation at Temperature Extremes
■ PROBLEM DEFINITION
Asynchronous Digital Communications Interfaces may fail framing beyond 0 to 70°C. This problem does not
affect end-product usage between 0 and 70°C.
■ PARAMETERS AFFECTED
The IMO frequency tolerance. The worst case deviation when operated below 0°C and above +70°C and within
the upper and lower datasheet temperature range is ±5%.
■ TRIGGER CONDITION(S)
The asynchronous Rx/Tx clock source IMO frequency tolerance may deviate beyond the data sheet limit of
±2.5% when operated beyond the temperature range of 0 to +70°C.
■ SCOPE OF IMPACT
This problem may affect UART, IrDA, and FSK implementations.
■ WORKAROUND
Implement a quartz crystal stabilized clock source on at least one end of the asynchronous digital
communications interface.
■ FIX STATUS
The cause of this problem and its solution has been identified. Silicon fix is planned to correct the deficiency
in silicon.
References
[1] Document # 38-12025, CY8C21234/CY8C21334/CY8C21434/CY8C21534/CY8C21634 PSoC® Mixed-Signal
Array Final Data Sheet
Items Part Number Silicon Revision Fix Status
[1]. Internal Main Oscillator
(IMO) Tolerance Deviation at
Temperature Extremes
CY8C21x34 A
Silicon fix is planned.
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