FreeCalypso > hg > fc-small-hw

comparison duart28/src/MCL @ 28:bd7eec55ebc0

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duart28: new design ideas * added input buffers (LVC with Ioff feature) to prevent high current flow from powered-up target into powered-down FT2232D inputs; * added series resistors on outputs to limit current flow from powered-up adapter into powered-down Calypso target; * buffer IC changed from 74LVC125A to 74LVC541A.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 28 Jun 2020 22:06:24 +0000
parents b58388f57c16
children ccb544045646
comparison
equal deleted inserted replaced
27:b58388f57c16 28:bd7eec55ebc0
97 vendor=Digi-Key 97 vendor=Digi-Key
98 vendor_part_number=296-39282-1-ND 98 vendor_part_number=296-39282-1-ND
99 footprint=file:TLV702xxDBV 99 footprint=file:TLV702xxDBV
100 npins=5 100 npins=5
101 101
102 part 74LVC541A:
103 device=74LVC541A
104 manufacturer=Nexperia
105 manufacturer_part_number=74LVC541APW
106 description=Octal buffer IC, TSSOP20 package
107 vendor=Digi-Key
108 vendor_part_number=1727-6370-1-ND
109 footprint=file:TSSOP20_MNF
110 npins=20
111
102 # buffer for driving outputs from the adapter 112 # buffer for driving outputs from the adapter
103 U5: 113 U5:
104 device=74LVC125A 114 part=74LVC541A
105 manufacturer=Nexperia 115
106 manufacturer_part_number=74LVC125APW 116 # buffer for inputs coming into the adapter
107 description=Quad buffer IC, TSSOP14 package 117 U6:
108 vendor=Digi-Key 118 part=74LVC541A
109 vendor_part_number=1727-2868-ND
110 footprint=file:TSSOP14_MNF
111 npins=14
112 119
113 # Crystal 120 # Crystal
114 121
115 Y1: 122 Y1:
116 hier=usb.FT2232D.xtal 123 hier=usb.FT2232D.xtal