LS1021A port pin capacitance

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LS1021A port pin capacitance

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FK
Contributor I

With reference to LS1021A, what is the input/output capacitance of IntegratedFlashCcontroller (IFC) port pins?

Unfortunately, most recent data sheet (Rev. 6, 07/2018) doesn't provide requested information.

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ufedor
NXP Employee
NXP Employee

In the processor's IBIS model IFC pins are defined as:
C_pin (avg) 1.35pF
R_pin (avg) 0.4Ohm
L_pin (avg) 3.4nH

Input_IBIS.jpg

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423 Views
FK
Contributor I

Thanks for the prompt reply. With regards to the reference circuity you attached, C_pin (out of IBIS) file is a part of the overall capacitive value, seen from outside of the package.

Taking the information for SYSCLK as an example, IBIS file defines ~1.6pF for C_pin and C_comp < 3pF.  Data sheet specifies 7pF typ (12pF w.c.) as input capacitance for SYSCLK. How to match data from IBIS file and data sheet?

Thanks in advance.

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ufedor
NXP Employee
NXP Employee

The data sheet has general values that may be worst-case and may be carried over from designs in general. In some cases, those values are appropriate. The IBIS model would have the more accurate values, from what the Design team has given us.

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