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): support1@ftdichip.com Web: http://www.ftdichip.com
Copyright © 2013 Future Technology Devices International Limited
Future Technology Devices International Ltd.
TN_141 FT240X Errata Technical Note
Document Reference No.: FT_000643
Version 1.4
Issue Date: 2013-06-10
The intention of this errata technical note is to give a detailed description of known functional or electrical
issues with the FTDI FT240X devices.
The current revision of the FT240X is revision D, released November 2012.
Copyright © 2013 Future Technology Devices International Limited 1
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
TABLE OF CONTENTS
1 FT240X Revision .................................................................................... 2
2 Errata History Table – Functional Problems ........................................ 3
2.1 Errata History Table – Electrical and Timing Specification Deviations. ......... 3
3 Functional Problems of FT240X ........................................................... 4
3.1 Revision A ............................................................................................................ 4
3.1.1 USB Data Transfer .................................................................................................................. 4
3.1.2 USB 3.0 Hosts ......................................................................................................................... 5
3.2 Revision B ............................................................................................................ 6
3.2.1 USB Data Transfer .................................................................................................................. 6
3.2.2 USB 3.0 Hosts ......................................................................................................................... 7
3.3 Revision C ............................................................................................................ 8
3.3.1 USB Data Transfer .................................................................................................................. 8
3.3.2 USB 3.0 Hosts ......................................................................................................................... 9
3.4 Revision D ............................................................................................................ 9
Electrical and Timing specification deviations of FT240X ...................... 10
3.5 Revision A .......................................................................................................... 10
3.6 Revision B .......................................................................................................... 10
3.6.1 Internal 3V3 Regulator ........................................................................................................... 10
3.7 Revision C .......................................................................................................... 10
3.8 Revision D .......................................................................................................... 10
4 FT240X Package Markings .................................................................. 11
5 Contact Information............................................................................. 12
Appendix C – Revision History ................................................................. 13
Copyright © 2013 Future Technology Devices International Limited 2
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
1 FT240X Revision
FT240X part numbers are listed in Table 1. The letter at the end of date code identifies the device
revision.
The current revision of the FT240X is revision D, released November 2012. At the time of releasing
this Technical Note there are no known issues with this silicon revision.
Part Number
Package
FT240XQ
20 pin QFN
FT240XS
20 pin SSOP
Table 1 FT240X Part Numbers
This errata technical note covers the revisions of FT240X listed in Table 2.
Revision
Notes
A
First device revision. Never sold publicly.
B
Second device revision. Launched 28 February 2012
C
Third device version. Released 11th June 2012
D
Forth device version. Released 6th November 2012
Table 2 FT240X Revisions
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TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
2 Errata History Table – Functional Problems
Functional
Problem
Short description
USB Data
Transfer
Transfer of data over USB stops unexpectedly
USB 3.0 Hosts
USB 3.0 Host occasional interoperability
Table 3 Functional Errata
2.1 Errata History Table – Electrical and Timing Specification
Deviations.
Deviations
Short description
Errata occurs in
device revision
Fault with internal 3V3
regulator.
Device VCC is designed to
operate between 3V3 and 5V
however with this errata the
supply should not be set below
4.3V for correct operation.
B
Table 4 Electrical and Timing Errata
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TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
3 Functional Problems of FT240X
3.1 Revision A
3.1.1 USB Data Transfer
Introduction:
An issue has been identified where the transfer of data over USB stops unexpectedly.
Problem:
The device is put into suspend mode during a transfer of certain data patterns most notable with binary
zeros. This can halt the data transfer in certain circumstances and will require the device to be re-
enumerated to recover.
NB. It is the presence of this data pattern on the USB bus regardless of whether the data is intended for
the FT240X or other devices (e.g. a broadcast) on the bus that forces the suspend state.
Workaround:
This issue can be avoided by utilising the keep awake function of the chip. This will disable the USB
suspend function of the chip and is therefore an intermediate workaround until revision D silicon is
released with a permanent fix.
NB. With the workaround the chip will never enter lower powered suspend. However the keep awake
current will be approximately 3mA.
To enable the keep awake function in the EEPROM, one of the CBUS pins needs to be configured as Keep-
Awake#. This pin then needs to be tied to ground on the PCB. The FT_Prog utility can be used to
configure the CBUS pin.
Package specific:
The effected packages are listed in Table 5.
Package
Applicable (Yes/No)
FT240XQ
Y
FT240XS
Y
Table 5
Copyright © 2013 Future Technology Devices International Limited 5
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
3.1.2 USB 3.0 Hosts
Introduction:
An issue has been identified where the FT240X will not enumerate when connected to certain USB 3.0
Hosts. So far FTDI have identified ONE such host.
Problem:
Certain USB 3.0 Hosts exhibit reduced reset recovery times after a USB reset, which can at times be
faster or close to the USB 2.0 specification limit. The USB 2.0 specification states a USB reset recovery
time of 10ms and in general almost all hosts allocate a much longer period than this. The FT240X device
may not enumerate if the reset recovery time is reduced.
This issue has been seen on one USB 3.0 Host controller and has not been seen on a USB 2.0 Host
controller or other USB 3.0 Host controllers.
Workaround:
Reconnect the device to a USB 2.0 host. This issue has been seen only on one particular USB 3.0 Host
controllers.
Package specific:
The effected packages are listed in Table 6.
Package
Applicable (Yes/No)
FT240XQ
Y
FT240XS
Y
Table 6
Copyright © 2013 Future Technology Devices International Limited 6
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
3.2 Revision B
3.2.1 USB Data Transfer
Introduction:
An issue has been identified where the transfer of data over USB stops unexpectedly.
Problem:
The device is put into suspend mode during a transfer of certain data patterns most notable with binary
zeros. This can halt the data transfer in certain circumstances and will require the device to be re-
enumerated to recover.
NB. It is the presence of this data pattern on the USB bus regardless of whether the data is intended for
the FT240X or other devices (e.g. a broadcast) on the bus that forces the suspend state.
Workaround:
This issue can be avoided by utilising the keep awake function of the chip. This will disable the USB
suspend function of the chip and is therefore an intermediate workaround until revision D silicon is
released with a permanent fix.
NB. With the workaround the chip will never enter lower powered suspend. However the keep awake
current will be approximately 3mA.
To enable the keep awake function in the EEPROM, one of the CBUS pins needs to be configured as Keep-
Awake#. This pin then needs to be tied to ground on the PCB. The FT_Prog utility can be used to
configure the CBUS pin.
Package specific:
The effected packages are listed in Table 7.
Package
Applicable (Yes/No)
FT240XQ
Y
FT240XS
Y
Table 7
Copyright © 2013 Future Technology Devices International Limited 7
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
3.2.2 USB 3.0 Hosts
Introduction:
An issue has been identified where the FT240X will not enumerate when connected to certain USB 3.0
Hosts. So far FTDI have identified ONE such host.
Problem:
Certain USB 3.0 Hosts exhibit reduced reset recovery times after a USB reset, which can at times be
faster or close to the USB 2.0 specification limit. The USB 2.0 specification states a USB reset recovery
time of 10ms and in general almost all hosts allocate a much longer period than this. The FT240X device
may not enumerate if the reset recovery time is reduced.
This issue has been seen on one USB 3.0 Host controller and has not been seen on a USB 2.0 Host
controller or other USB 3.0 Host controllers.
Workaround:
Reconnect the device to a USB 2.0 host. This issue has been seen only on one particular USB 3.0 Host
controllers.
Package specific:
The effected packages are listed in Table 8.
Package
Applicable (Yes/No)
FT240XQ
Y
FT240XS
Y
Table 8
Copyright © 2013 Future Technology Devices International Limited 8
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
3.3 Revision C
3.3.1 USB Data Transfer
Introduction:
An issue has been identified where the transfer of data over USB stops unexpectedly.
Problem:
The device is put into suspend mode during a transfer of certain data patterns most notable with binary
zeros. This can halt the data transfer in certain circumstances and will require the device to be re-
enumerated to recover.
NB. It is the presence of this data pattern on the USB bus regardless of whether the data is intended for
the FT240X or other devices (e.g. a broadcast) on the bus that forces the suspend state.
Workaround:
This issue can be avoided by utilising the keep awake function of the chip. This will disable the USB
suspend function of the chip and is therefore an intermediate workaround until revision D silicon is
released with a permanent fix.
NB. With the workaround the chip will never enter lower powered suspend. However the keep awake
current will be approximately 3mA.
To enable the keep awake function in the EEPROM, one of the CBUS pins needs to be configured as Keep-
Awake#. This pin then needs to be tied to ground on the PCB. The FT_Prog utility can be used to
configure the CBUS pin.
Package specific:
The effected packages are listed in Table 9.
Package
Applicable (Yes/No)
FT240XQ
Y
FT240XS
Y
Table 9
Copyright © 2013 Future Technology Devices International Limited 9
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
3.3.2 USB 3.0 Hosts
Introduction:
An issue has been identified where the FT240X will not enumerate when connected to certain USB 3.0
Hosts. So far FTDI have identified ONE such host.
Problem:
Certain USB 3.0 Hosts exhibit reduced reset recovery times after a USB reset, which can at times be
faster or close to the USB 2.0 specification limit. The USB 2.0 specification states a USB reset recovery
time of 10ms and in general almost all hosts allocate a much longer period than this. The FT240X device
may not enumerate if the reset recovery time is reduced.
This issue has been seen on one USB 3.0 Host controller and has not been seen on a USB 2.0 Host
controller or other USB 3.0 Host controllers.
Workaround:
Reconnect the device to a USB 2.0 host. This issue has been seen only on one particular USB 3.0 Host
controllers.
Package specific:
The effected packages are listed in Table 10.
Package
Applicable (Yes/No)
FT240XQ
Y
FT240XS
Y
Table 10
3.4 Revision D
No known issues at revision D.
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TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
Electrical and Timing specification deviations of FT240X
3.5 Revision A
No known issues at revision A
3.6 Revision B
3.6.1 Internal 3V3 Regulator
Introduction:
The FT240X uses an internal regulator to generate 3V3 from a 5V source (VCC). The source should be
variable from 3V3 to 5V.
Problem:
The VCC supply to the regulator must not drop below 4.3V for the correct 3V3 regulated output to be
produced.
Workaround:
VCC must not be supplied below 4.3V.
Package specific:
The effected packages are listed in Table 11.
Package
Applicable (Yes/No)
FT240XQ
Y
FT240XS
Y
Table 11
3.7 Revision C
No known issues at revision C.
3.8 Revision D
No known issues at revision D.
Copyright © 2013 Future Technology Devices International Limited 11
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
4 FT240X Package Markings
FT240X is available in a RoHS Compliant RoHS Compliant package, 24 pin QFN and 24 pin SSOP. An
example of the markings on the package is shown in Figure 5.1.
Figure 4-1 Package Markings – FT240XQ
Figure 4-2 Package Markings – FT240XS
The date code format is YYWW where WW = 2 digit week number, YY = 2 digit year number. This is
followed by the revision number.
The code XXXXXXXXXXXX is the manufacturing LOT code
Line 1 – FTDI Logo
FT240XS
1 12
1324
-C
Line 2 – Date Code, Revision
Line 3 – Wafer Lot Number
Line 4 – FTDI Part Number
FTDI
XXXXXXXXXX
FT240XQ
Line 1 – FTDI Logo
Line 4 – Date Code, Revision
Line 2 – Wafer Lot Number
7
1
Line 3 – FTDI Part Number
YYWW-C
12
18
Copyright © 2013 Future Technology Devices International Limited 12
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
5 Contact Information
Head Office – Glasgow, UK
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)
sales1@ftdichip.com
E-mail (Support)
support1@ftdichip.com
E-mail (General Enquiries)
admin1@ftdichip.com
Branch Office – Taipei, 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)
tw.sales1@ftdichip.com
E-mail (Support)
tw.support1@ftdichip.com
E-mail (General Enquiries)
tw.admin1@ftdichip.com
Branch Office – Oregon, USA
7130 Fir Loop,
Tigard, OR 97223-8160
USA
Tel: +1 (503) 547 0988
Fax: +1 (503) 547 0987
E-Mail (Sales)
us.sales@ftdichip.com
E-Mail (Support)
us.support@ftdichip.com
E-Mail (General Enquiries)
us.admin@ftdichip.com
Branch Office – Shanghai, China
Room 1103, No. 666 West Huaihai Road,
Shanghai, 200052
China
Tel: +86 21 62351596
Fax: +86 21 62351595
E-mail (Sales)
cn.sales@ftdichip.com
E-mail (Support)
cn.support@ftdichip.com
E-mail (General Enquiries)
cn.admin@ftdichip.com
Web Site
http://ftdichip.com
System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future Technology
Devices International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level
performance requirements. All application-related information in this document (including application descriptions, suggested
FTDI devices and other materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this
information is subject to customer confirmation, and FTDI disclaims all liability for system designs and for any applications
assistance provided by FTDI. Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the
user agrees to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from
such use. This document is subject to change without notice. No freedom to use patents or other intellectual property rights is
implied by the publication of this document. Neither the whole nor any part of the information contained in, or the product
described in this document, may be adapted or reproduced in any material or electronic form without the prior written consent
of the copyright holder. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park,
Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC136640
Copyright © 2013 Future Technology Devices International Limited 13
TN_141 FT240X Errata Technical Note
Version 1.4
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
Appendix C – Revision History
Document Title: TN_141 FT240X Errata Technical Note
Document Reference No.: FT_000643
Clearance No.: FTDI# 287
Product Page: http://www.ftdichip.com/FT-X.htm
Document Feedback: Send Feedback
Version 1.0 First Release 09/03/2012
Version 1.1 Added rev C and Updated China address 11/06/2012
Version 1.2 Added USB data transfer issue 12/07/2012
Version 1.3 Added USB 3.0 hosts and note to Problem section
of USB data transfer 14/08/2012
Version 1.4 Added revision D – no known issues,
updated contact information 10/06/2013