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                   5                               4                   3                                                2                               1




                       R1 100         D2                                                                           D1
    VCC Sense (15)                2            1                                                               2             1                                   VCC

                                      1N5817           R13                                                         1N5817
                                                       1K                                                  R8
D                                                                                                                                                                            D
                                                                                             C5            5.1K
                                                                                             0.01uF

                                                                                                                                                                 GND
                       R7 300
           CLK (3)
                                                                  U1

                       R4 300                                 2                     3                                                         R9                 TDO/D/P
                                                                   1A         1Y                                                    R10       100
           DIN (2)                                            5    2A         2Y    6                                                                            TDI/DIN
                                                              9                     8                               R11             100
                                                                   3A         3Y                                                                                 TCK/ CCLK
                                                             12                     11           R12                100
                                                                   4A         4Y                                                                                 TMS/PROG
                       R3   300                                                                  100
         PROG (6)                                             1    1OE
                                                              4    2OE
                                                             10                                        C4                   C3      C2        C1
                       R5   300                                    3OE                                 100pF                100pF   100pF   100pF
                                                             13    4OE
C                                                                                                                                                                            C
        TMS_IN (4)
                                                             14    VCC       GND    7

                       R6   300
                                                                  74HC125
          CTRL (5)

                       R14 100
                                                                   U2

                       R2   100                                2       1A      1Y       3     GENERAL DESCRIPTION
                                                               5                        6
        DONE (13)
                                                               9
                                                                       2A      2Y
                                                                                        8     The 74HC/HCT125 are high-speed Si-gate CMOS devices and
                                                                       3A      3Y
                                                              12       4A      4Y       11    are pin compatible with low power Schottky TTL (LSTTL).
                                                               1                              They are specified in compliance with JEDEC standard no. 7A.
                                                                       1OE
         GND (20)                                              4       2OE                    The 74HC/HCT125 are four non-inverting buffer/line drivers with
                                                              10
B
                                                              13
                                                                       3OE
                                                                       4OE
                                                                                              3-state outputs. The 3-state outputs (nY) are controlled                       B


                                                              14                        7
                                                                                              by the output enable input (nOE). A HIGH at nOE causes the
         GND (25)                                                      VCC    GND
                                                                                              outputs to assume a HIGH impedance OFF-state.
                                                                   74HC125                    The “125” is identical to the “126” but has active LOW enable
            D6 (8)                                                                            inputs.

        BUSY (11)


           PE (12)




A                                                                                                                                                                            A
          SHIELD
                                                                                               Title
                                                                                                           JTAG Cable

                                                                                               Size        Document Number                                             Rev
                                                                                                 A                                                                 1

                                                                                               Date:                                        Sheet   1       of    1              0

                   5                               4                   3                                                2                               1