FT245B Errata Technical Note

Future Technology Devices International Ltd.
TN_123 FT245BM/BL/BQ Errata Technical Note
Document Reference No.: FT_000271
Version 1.0
Issue Date: 2010-11-19
The intention of this errata technical note is to give a detailed description of any known functional or
electrical issues with the FTDI FT245BL/BQ/BM devices.
The current revision of the FT245BL is revision A, released Jan 2005
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_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
TABLE OF CONTENTS
1
FT245B Revision .................................................................................... 2
2
Errata History Table – Functional Problems........................................ 3
2.1
3
Functional Problems of FT245BM/BL/BQ ............................................ 4
3.1
3.1.1
4
Errata History Table – Electrical and Timming Specification Deviations. ...... 3
First Revision ....................................................................................................... 4
BitBang Mode variable Pulse Width ........................................................................................ 4
Electrical and Timing specification deviations of FT245B ................. 5
4.1
First Revision ....................................................................................................... 5
5
FT245B Package Markings.................................................................... 6
6
Contact Information............................................................................... 7
Appendix C – Revision History ................................................................... 9
Copyright © 2010 Future Technology Devices International Limited
1
Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
1
FT245B Revision
FT245B part numbers are listed in Table 1.The letter at the end of date code identifies the device
revision.
Part Number
Package
FT245BM
32 Pin LQFP
FT245BL
32 Pin LQFP
FT245BQ
32 Pin QFN
Table 1 FT245B Part Numbers
This errata technical note covers the revisions of FT245B listed in Table 2
Part
Revision
Notes
FT245BM
1
First device revision has no number after the part number
FT245BM
2
Second Device revision has a -1 after the part number
1
First device revision has no number after the part number
Number
FT245BL
FT245BQ
Table 2 FT245B Revisions
Copyright © 2010 Future Technology Devices International Limited
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Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
2
Errata History Table – Functional Problems
Functional
Problem
Short description
Errata occurs in
device revision
FT245BM/BQ/BL
Bitbang pulse width not stable
-,-1
2.1 Errata History Table – Electrical and Timming Specification
Deviations.
Deviations
Short description
Errata occurs in device revision
Copyright © 2010 Future Technology Devices International Limited
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Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
3
Functional Problems of FT245BM/BL/BQ
3.1 First Revision
3.1.1 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.
Package specific:
The effected packages are listed in Table 3
Package
Applicable (Yes/No)
FT245BM
Y
FT245BL
Y
FT245BQ
Y
Table 3
Copyright © 2010 Future Technology Devices International Limited
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Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
4
Electrical and Timing specification deviations of FT245B
4.1 First Revision
There are no known electrical or timing problems with any revision of silicon.
Copyright © 2010 Future Technology Devices International Limited
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Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
5
FT245B Package Markings
FT245BM is available in a non-RoHS Compliant package, 32 pin LQFP. An example of the markings on the
package is shown in Figure 3-1.
Note that there are two date code formats used XXYY = Date Code where XX = 2 digit year
number, YY = 2 digit week number; or XYY-N
where X = 1 digit year. Number, YY = 2 digit
week number, and -N is an integer.
Figure 5-1 Package Markings – FT245BM
FT245B is available in two RoHS Compliant packages, 32 pin LQFP and 32 pin QFN. An example of the
markings on each package is shown in Figure 5-2.
Note that there are two date code formats used XXYY = Date Code where XX = 2 digit year
number, YY = 2 digit week number; or XYY-N
where X = 1 digit year. Number, YY = 2 digit
week number, and -N is an integer.
Figure 5-2 Package Markings – FT245BL/FT245BQ
Copyright © 2010 Future Technology Devices International Limited
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Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
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
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Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
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 preliminary
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
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Document Reference No.: FT_000272
TN_123 FT245BM/BL/BQ Errata Technical Note
Version 1.0
Clearance No.: FTDI# 185
Appendix C – Revision History
Version Draft First Draft
Version 1.0
First Release
04/05/2010
19/11/2010
Copyright © 2010 Future Technology Devices International Limited
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