________________________________________________________________________________

MODEL:  std139.vhd                                               VERSION:    1.0
DESCRIPTION:  2 to 4 decoder                                     DATE: 97 SEP 24
TIMING FILE:  std139.ftm                                         VERSION:    1.0
                                                                 DATE: 98 MAR 27

LIBRARY:  STND

GENERIC PART NUMBERS COVERED:  74ACT139, 74FCT139

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SUPPORTED PART NUMBERS
    ____________________________________________________________________________

                   Motorola, Inc.

    Part Number                       Data Source
    ____________________________________________________________________________

    MC74ACT139D                             1

    MC74ACT139N                             1

    ____________________________________________________________________________

                   Fairchild Semiconductor

    Part Number                       Data Source
    ____________________________________________________________________________

    74ACT139MTC                             2

    74ACT139PC                              2

    74ACT139SC                              2

    74ACT139SJ                              2

    ____________________________________________________________________________

                   Integrated Device Technology

    Part Number                       Data Source
    ____________________________________________________________________________

    IDT74FCT139CTL                          3

    IDT74FCT139CTP                          3

    IDT74FCT139CTQ                          3

    IDT74FCT139CTSO                         3

    ____________________________________________________________________________

                   Quality Semiconductor

    Part Number                       Data Source
    ____________________________________________________________________________

    QS74FCT139CTP                           4

    QS74FCT139CTSO                          4

    QS74FCT139CTS1                          4

    QS74FCT139CTQ                           4

    QS74FCT139CTH                           4

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DATA SOURCES

    These are the primary sources of data used in determining behaviour and 
    timing of the components represented by this model.

    1.   Motorola FACT Data DL139/Rev 3

    2.   Fairchild Semiconductor data sheet February 1998

    3.   Integrated Device Technology data sheet September 1996

    4.   Quality Semiconductor data sheet MDSL-00004-02