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boards:ecb:4uart-usb:start [2018/07/14 04:43]
b1ackmai1er
boards:ecb:4uart-usb:start [2019/03/20 13:43] (current)
denis2342 fixed the link for the parts list jpg
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 ====== 4UART-USB ====== ====== 4UART-USB ======
 +
 +The ECB 4UART-USB board provides two RS232 level serial interfaces and two USB serial interfaces through FT232RL add on boards.
 +
 +{{https://​www.retrobrewcomputers.org/​lib/​plugins/​ckgedit/​fckeditor/​userfiles/​image/​boards/​ecb/​4uart-usb/​ecb-4uart-usb.png?​nolink&​800x492}}
 +
  
 ===== Overview ===== ===== Overview =====
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 Testing indicates that the TL16C754B chips are very sensitive to the relative timing of CSx# and IOW#. CSx# must fall 10ns before IOW#. One way to achieve this is to fit 74ALS139 or 74AHCT139 in place of 74LS139, and use 74LS on the rest of the board (with the exception of the 74F00). SC16C754B does not appear to suffer from this sensitivity. Testing indicates that the TL16C754B chips are very sensitive to the relative timing of CSx# and IOW#. CSx# must fall 10ns before IOW#. One way to achieve this is to fit 74ALS139 or 74AHCT139 in place of 74LS139, and use 74LS on the rest of the board (with the exception of the 74F00). SC16C754B does not appear to suffer from this sensitivity.
 +
 +===== Errata =====
 +
 +The board schematic and board layout are updated from 1.0-002 to 1.0-003 to correct a label error on the RS-232 chip. The erroneous label is MAX239, which is corrected to MAX249. The User Manual got it right. Also, the parts list was posted as a progressive JPG, which the Wiki does not understand. It is reposted as an old JPG, which seems to be okay. It also contains the correction. The physical boards labeled 1.0-002 should have the MAX239 silkscreen label updated to MAX249, and the -002 updated to -003 in ink.
 +
 +There are no circuit updates as of 30-Mar-2016.
 +
 +===== Resources =====
 +
 +^Filename^Size^Updated|
 +|{{:​boards:​ecb:​4uart-usb:​ecb-4uart-1.0-003-sch.pdf|ECB-4UART-1.0-003-sch.pdf}} ​  ​|414Kb|2016-03-30|
 +|{{:​boards:​ecb:​4uart-usb:​ecb-4uart-1.0-003-brd.pdf|ECB-4UART-1.0-003-brd.pdf}} ​  ​|491Kb|2016-03-30|
 +|{{https://​www.retrobrewcomputers.org/​lib/​exe/​fetch.php?​media=boards:​ecb:​4uart-usb:​ecb-4uart-1.0-003-parts_list.jpg?​linkonly|ECB-4UART-1.0-003-parts_list.jpg}} ​  ​|292Kb|2016-03-30|
 +|{{:​boards:​ecb:​4uart-usb:​ecb-4uart-1.0_manual.pdf|ECB-4UART-1.0_manual.pdf}} ​  ​|385Kb|2016-03-07|
 +|{{:​boards:​ecb:​4uart-usb:​tl16c754b.pdf|TL16C754B datasheet}} ​ (PDF)|675Kb|2004-06-01|
 +|{{:​boards:​ecb:​4uart-usb:​tl16c754-errata.pdf|TL16C754-errata}} ​ (PDF)|41Kb|2006-08-01|
 +|{{:​boards:​ecb:​4uart-usb:​tl-sc16c754b.pdf|SC16C754B datasheet}} ​ (PDF)|259Kb|2008-10-08|
 +|{{:​boards:​ecb:​4uart-usb:​max249-page.pdf|MAX249 page}} ​ (PDF)|66Kb|2001-08-01|
 +
 +last update: 30-Mar-2016:::::​John Coffman
 +
 +\\
  
  
boards/ecb/4uart-usb/start.1531557814.txt.gz · Last modified: 2018/07/14 04:43 by b1ackmai1er
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