TN_121 FT245R Errata Technical Note Document Reference No.: FT_000256 Version 1.0 Issue Date: 2010-11-05 The intention of this errata technical note is to give a detailed description of known functional or electrical issues with the FTDI FT245R devices. The current revision of the FT245R is revision B, released May 2007. At the time of releasing this Technical Note there are no known issues with this silicon revision. Future Technology Devices International Limited (FTDI) Unit1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH United Kingdom Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758 E-Mail (Support): [email protected] Web: http://www.ftdichip.com Copyright © 2010 Future Technology Devices International Limited Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 TABLE OF CONTENTS 1 FT245R Revision .................................................................................... 2 2 Errata History Table – Functional Problems........................................ 3 2.1 3 Functional Problems of FT245R ........................................................... 4 3.1 Revision A ............................................................................................................ 4 3.1.1 PWREN# pulses during enumeration ...................................................................................... 4 3.1.2 BitBang Mode Variable Pulse Width........................................................................................ 4 3.1 4 Errata History Table – Electrical and Timming Specification Deviations. ...... 3 Revision B ............................................................................................................ 5 Electrical and Timing specification deviations of FT245R ................. 6 4.1 4.1.1 4.1 Revision A ............................................................................................................ 6 VCCIO cannot be set below 2.6V ............................................................................................ 6 Revision B ............................................................................................................ 6 5 FT245R Package Markings.................................................................... 7 6 Contact Information............................................................................... 8 Appendix C – Revision History ................................................................. 10 Copyright © 2010 Future Technology Devices International Limited 1 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 1 FT245R Revision FT245R part numbers are listed in Error! code identifies the device revision. Reference source not found.. The letter at the end of date The current revision of the FT245R is revision B, released May 2007. At the time of releasing this Technical Note there are no known issues with this silicon revision. Part Number Package FT245RL 28 Pin SSOP FT245RQ 32 Pin QFN Table 1 FT245R Part Numbers This errata technical note covers the revisions of FT245R listed in Error! Reference source not found.. Revision Notes A First device revision B Second Device revision Table 2 FT245R Revisions Copyright © 2010 Future Technology Devices International Limited 2 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 2 Errata History Table – Functional Problems Functional Problem Errata occurs in device revision Short description PWREN# signal will not be stable during enumeration – 3 FT245R A pulses. 2.1 Errata History Table – Electrical and Timming Specification Deviations. Deviations FT245R Short description Errata occurs in device revision Cannot set VCCIO below 2.6V due to internal RESET# pullup Copyright © 2010 Future Technology Devices International Limited A 3 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 3 Functional Problems of FT245R 3.1 Revision A 3.1.1 PWREN# pulses during enumeration Introduction: PWREN# is an output to signal if the device is enumerated and awake (logic 0) or if it is in reset/suspend (logic 1) Problem: During enumeration the pins were configured as outputs and as a consequence of the 3 resets required during enumeration the device toggled 3 times giving a false indication that the device was ready to use. Workaround: There are no known workarounds available. This issue will be corrected at silicon revision B. Package specific: The effected packages are listed in Table 3. Package Applicable (Yes/No) FT245RL Y FT245RQ Y Table 3 3.1.2 BitBang Mode Variable Pulse Width Introduction: BitBang is a mode the device may be put into to allow free running data to be clocked in/out of the device without any control bits. Problem: The output may be clocked out at different speeds to allow for different pulse widths. However this clocking stage is not synchronized with the incoming data and can result in the pulse widths varying unexpectedly on the output. Workaround: Set the clock divisor to 1 (baud rate = 3,000,000) and pad the data field with extra 1’s or 0’s to achieve the required pulse width for each bit. Copyright © 2010 Future Technology Devices International Limited 4 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 Package specific: The effected packages are listed in Table 4. Package Applicable (Yes/No) FT245RL Y FT245RQ Y Table 4 3.1 Revision B There are no known new functional issues specific to revision B. Copyright © 2010 Future Technology Devices International Limited 5 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 4 Electrical and Timing specification deviations of FT245R 4.1 Revision A 4.1.1 VCCIO cannot be set below 2.6V Introduction: The FT245R device is specified to handle IO down to 1.8V. Problem: The FT245R device contains an internal pullup (200k) on RESET#. This is wired to VCCIO and not VCC. If VCCIO is below 2.6V the device will not come out of reset. Workaround: There are no known workarounds available. This issue will be corrected at silicon revision B. Package specific: The effected packages are listed in Table 5 Package Applicable (Yes/No) FT245RL Y FT245RQ Y Table 5 4.1 Revision B There are no known functional problems with revision B. Copyright © 2010 Future Technology Devices International Limited 6 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 5 FT245R Package Markings FT245R is available in two RoHS Compliant packages, 32 pin QFN and 28 pin SSOP. An example of the markings on each package is shown in Figure 5-1.. YYXX-A Where YY is 2 digit year code, XX is 2 digit week code and -A is the revision XXXXXXXXXXXX is the manufacturing LOT code Figure 5-1 Package Markings – 28 SSOP YYXX-A Where YY is the 2 digit year code, XX is 2 digit week code and -A is the revision XXXXXXXX is the manufacturing LOT code D7 Figure 5-2 Markings – 32 QFN Copyright © 2010 Future Technology Devices International Limited 7 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 6 Contact Information Head Office – Glasgow, UK Future Technology Devices International Limited Unit 1, 2 Seaward Place, Centurion Business Park Glasgow G41 1HH United Kingdom Tel: +44 (0) 141 429 2777 Fax: +44 (0) 141 429 2758 E-mail (Sales) [email protected] E-mail (Support) [email protected] E-mail (General Enquiries) [email protected] Web Site URL http://www.ftdichip.com Web Shop URL http://www.ftdichip.com Branch Office – Taipei, Taiwan Future Technology Devices International Limited (Taiwan) 2F, No 516, Sec. 1 NeiHu Road Taipei 114 Taiwan, R.O.C. Tel: +886 (0) 2 8797 1330 Fax: +886 (0) 2 8751 9737 E-mail (Sales) [email protected] E-mail (Support) [email protected] E-mail (General Enquiries) [email protected] Web Site URL http://www.ftdichip.com Branch Office – Hillsboro, Oregon, USA Future Technology Devices International Limited (USA) 7235 NW Evergreen Parkway, Suite 600 Hillsboro, OR 97123-5803 USA Tel: +1 (503) 547 0988 Fax: +1 (503) 547 0987 E-Mail (Sales) [email protected] E-Mail (Support) [email protected] E-Mail (General Enquiries) [email protected] Web Site URL http://www.ftdichip.com Branch Office – Shanghai, China Future Technology Devices International Limited (China) Room 408, 317 Xianxia Road, ChangNing District, ShangHai, China Tel: +86 (21) 62351596 Fax: +86(21) 62351595 E-Mail (Sales): [email protected] E-Mail (Support): [email protected] E-Mail (General Enquiries): [email protected] Web Site URL: http://www.ftdichip.com Copyright © 2010 Future Technology Devices International Limited 8 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 Distributor and Sales Representatives Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and sales representative(s) in your country. Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminar y information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH United Kingdom. Scotland Registered Number: SC136640 Copyright © 2010 Future Technology Devices International Limited 9 Document Reference No.: FT_000256 TN_121 FT245R Errata Technical Note Version 1.0 Clearance No.: FTDI# 183 Appendix C – Revision History Version 1.0 First Release 05/11/2010 Copyright © 2010 Future Technology Devices International Limited 10