Application Note
AN_560Migrating from FT2xxR to FT2xxRN
Version 1.2

Issue Date: 27-07-2023

This Application Note shows how to migrate from FT232R/FT245R to
FT232RN/FT245RN and discusses all hardware and software aspects.

Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and theuser agrees to defend, indemnify, and hold FTDI harmless from any and all damages, claims,
suits, or expense resulting from such use.

Future Technology Devices International Limited (FTDI)
Unit 1, 2 Seaward Place, Glasgow G41 1HH, United Kingdom
Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758
Web Site: http://ftdichip.com
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Table of Contents
1 Introduction .............................................................. 2
1.1 Product Summary Comparison ............................................2

2 Hardware................................................................... 6
2.1 VCC Supply Improvement ....................................................6
2.2 Pin Compatibility .................................................................6
2.3 Clock Source ........................................................................8
2.3.1

Internal Oscillator ............................................................................... 8

2.3.2

External Crystal .................................................................................. 8

2.3.3

External Oscillator ............................................................................... 9

2.4 Using 3V3OUT to Power External Circuitry ........................ 10

3 Software .................................................................. 11
4 Conclusion ............................................................... 12
5 Contact Information ................................................ 13
Appendix A - References .............................................. 14
Document References ............................................................... 14
Acronyms and Abbreviations..................................................... 15

Appendix B – List of Tables & Figures .......................... 16
List of Tables.............................................................................16
List of Figures ...........................................................................16

Appendix C – Revision History ..................................... 17

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1 Introduction
To improve our supply efficiency on the popular R-Series, FTDI has launched a new RN-Series
which are designed / manufactured according to the current R-Series specification.
The RN-series are drop in pin-compatible replacements for the equivalent R-Series in nearly 100%of all design cases. This document details all hardware and software considerations when
migrating to the latest version of the IC (FT232RN/FT245RN).
Please refer to TN_183 FT232RN / FT245RN Errata Technical Note which describes the differences.
In this Application Note, FT2xxR denotes the original FT232R/FT245R and FT2xxRN denotes the
new FT232RN/FT245RN ICs.
The FT2xxR and FT2xxRN product pages and datasheet links can be found in the References
section.
Table 1.1 shows the part number summary.
Original
Part
Number
FT232RQ
FT232RL
FT245RQ
FT245RLNew Part
NumberDescription

FT232RNQ
FT232RNL
FT245RNQ
FT245RNL

USB to Serial UART Bridge in 32-pin QFN package
USB to Serial UART Bridge in 28-pin SSOP package
USB to FIFO Bridge in 32-pin QFN package
USB to FIFO Bridge in 28-pin SSOP package
Table 1.1 Part Number Summary

Table 1.2 shows current silicon revisions.
Part Number
Revision
FT232RQ / FT232RLC
FT245RQ / FT245RLC
FT232RNQ / FT232RNL
B
FT245RNQ / FT245RNL
B
Table 1.2 Part Revisions
The original FT232R/FT245R ICs have a limitation with respect to using the internal oscillator as
detailed in the datasheets:•

The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) whenusing the internal clock generator. Operation at +3.3V is possible using an
external crystal oscillator.

This has now been improved with the new FT232RN/FT245RN ICs. If VCC is supplied with 3.3V,
the internal oscillator can now be used, simplifying designs further.
The only difference that is not compatible with the FT2xxRN migration is when using an external
oscillator. There are no issues when using internal oscillator or external crystal. This is detailed inthis document.

1.1 Product Summary Comparison
Table 1.3 shows a side-by-side feature comparison of FT232R to FT232RN and Table 1.4 shows aside-by-side feature comparison of FT245R to FT245RN. This easily shows any differences between
the ICs.

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FT232RFT232RN

USB 2.0 Full Speed compatible. Compliant with the USB
2.0 specification✓✓

No USB specific firmware programming required✓✓

Fully integrated USB termination resistors (27ohm)
Fully integrated clock generation, fully operation w/o
external clock.

✓

✓

✓

✓

Optional clock output selection enabling a glue-lessinterface to external MCU or FPGA (6, 12,24, 48MHz)✓✓Can use External 12MHz Crystal✓✓

Can use External 1.8V Clock source✓✓

Can use External 3.3V Clock source✓

Data transfer rates from 300 to 3M baud (RS422, RS485,
RS232) at TTL levels

✓

✓

✓

✓

✓

✓

Synchronous and asynchronous bit bang interface options
with RD# and WR# strobes✓✓

UART interface support for 7 or 8 data bits, 1 or 2 stop
bits and odd / even / mark / space / no parity

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

Configurable CBUS I/O pins, Configurable I/O pin output
drive strength 2~8mA✓✓

TXDEN -Enable transmit data for RS485

✓

✓

✓

✓

✓

✓

✓

✓

TX&RXLED#-LED drive – pulses low when transmitting or
receiving data via USB.

✓✓SLEEP#-Goes low during USB suspend mode✓✓

Clock output-CLK48, CLK24, CLK12, CLK6✓✓

CBitBangI/O-CBUS bit bang mode option✓✓

BitBangWRn-Synchronous and asynchronous bit bangmode WR# strobe output✓✓

BitBangRDn-Synchronous and asynchronous bit bangmode RD# strobe output✓✓

True 5V/3.3V/2.8V/1.8V CMOS drive output and TTL
input
128 bytes receive buffer, and 256 bytes transmit buffer

FIFO receives and transmits buffers for high data
throughput
Unique USB FTDIChip-ID™ feature
Device supplied pre-programmed with unique USB serial
numberFully integrated 1024-bit EEPROM storing device
descriptors and CBUS I/O configuration, Able to re-write
10K cycles

PWREN#-Output is low after the device has been
configured by USB, then high during USB suspending
mode
TXLED#-Transmit data LED drive: Data from USB Host to
FT232R.
RXLED#-Receive data LED drive: Data from FT232R to
USB Host.

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FT232RFT232RN

✓

✓



✓

✓

✓

✓

✓

Integrated power-on-reset circuit✓✓+3.3V LDO regulator, with a maximum current of 50mA✓✓*

VCCIO can connect +1.8V to +5.25V DC and supply to
the UART Interface and CBUS group pins✓✓

Available in compact Pb-free 28 Pin SSOP and QFN-32
packages (both RoHS compliant).

✓✓+3.3V to +5.25V Single Supply Operation (using external
oscillator)+3.3V to +3.99V Single Supply Operation (using internal
oscillator)+4.0V to +5.25V Single Supply Operation (using internal
oscillator)
Low operating and USB suspend current(50~100uA)✓-40°C to 85°C extended operating temperature range
Table 1.3 FT232R/FT232RN Part Comparison✓

FT245RFT245RN

USB 2.0 Full Speed compatible. Compliant with the USB
2.0 specification✓✓

No USB specific firmware programming required✓✓

Fully integrated USB termination resistors (27ohm)
Fully integrated clock generation, fully operation w/o
external clock.

✓

✓

✓

✓

Optional clock output selection enabling a glue-lessinterface to external MCU or FPGA (6, 12,24, 48MHz)✓✓Can use External 12MHz Crystal✓✓

Can use External 1.8V Clock source✓✓

Can use External 3.3V Clock source✓

Data transfer rate to 1 Megabyte / second (D2XX Driver).
Data transfer rate to 300 kilobyte / second (VCP Driver).

✓✓

True 5V/3.3V/2.8V/1.8V CMOS drive output and TTL
input

✓

✓

128 bytes receive buffer, and 256 bytes transmit buffer✓✓

Synchronous and asynchronous bit bang interface options
with RD# and WR# strobes✓✓

Simple interface to MCU / PLD / FPGA logic with simple 4wire handshake interface✓✓

FIFO receives and transmits buffers for high data
throughput

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

Unique USB FTDIChip-ID™ feature
Device supplied pre-programmed with unique USB serial
numberFully integrated 1024-bit EEPROM storing device
descriptors and CBUS I/O configuration, Able to re-write
10K cycles
Configurable CBUS I/O pins, Configurable I/O pin output
drive strength 2~8mA

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FT245RFT245RN

✓

✓

✓

✓

✓

✓

✓

✓

TX&RXLED#-LED drive – pulses low when transmitting or
receiving data via USB.

✓✓SLEEP#-Goes low during USB suspend mode✓✓

Clock output-CLK48, CLK24, CLK12, CLK6✓✓

CBitBangI/O-CBUS bit bang mode option✓✓

BitBangWRn-Synchronous and asynchronous bit bangmode WR# strobe output✓✓

BitBangRDn-Synchronous and asynchronous bit bangmode RD# strobe output

✓

✓

✓

✓



✓

✓

✓

✓

✓

Integrated power-on-reset circuit✓✓+3.3V LDO regulator, with a maximum current of 50mA✓✓*

VCCIO can connect +1.8V to +5.25V DC and supply to
the UART Interface and CBUS group pins✓✓

Available in compact Pb-free 28 Pin SSOP and QFN-32
packages (both RoHS compliant).

✓✓

TXDEN -Enable transmit data for RS485
PWREN#-Output is low after the device has been
configured by USB, then high during USB suspending
mode
TXLED#-Transmit data LED drive: Data from USB Host to
FT232R.
RXLED#-Receive data LED drive: Data from FT232R to
USB Host.

+3.3V to +5.25V Single Supply Operation (using external
oscillator)+3.3V to +3.99V Single Supply Operation (using internal
oscillator)+4.0V to +5.25V Single Supply Operation (using internal
oscillator)
Low operating and USB suspend current(50~100uA)✓-40°C to 85°C extended operating temperature range
Table 1.4 FT245R/FT245RN Part Comparison✓* See section 2.4 Using 3V3OUT to Power External Circuitry
The FT2xxR and FT2xxRN are fully compliant with the USB 2.0 specification and have been given
the USB-IF Test-IDs (TID) according to Table 1.5 below.

USB-IF Test-ID(TID)

FT232RFT232RN

FT245RFT245RN

40770018

6654

40770019

6689

Table 1.5 USB-IF Test-IDs (TID)

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2 Hardware
This section discusses the hardware aspects of the migration.

2.1 VCC Supply Improvement
VCC supply for the device core is specified from +3.3V to +5.25V.
FT2xxRN has made a significant improvement with respect to VCC and clock source which would
help to simplify some designs further by removing the need for an external crystal or oscillator.
FT2xxR specifies a hardware limitation in the datasheet:•

The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) whenusing the internal clock generator. Operation at +3.3V is possible using an
external crystal oscillator.

Designs which are configured to power the IC with 3.3V to VCC meant that an external clock must
be used, adding more external hardware with more expense.
Now FT2xxRN has improved this aspect of the design. Any designs with VCC supply from +3.3V to+5.25V can use the internal clock source! This can simplify existing designs that were affected by
the original FT2xxR limitation.

2.2 Pin Compatibility
As mentioned in the introduction, the ICs are drop in pin compatible. This means that mosthardware designs require no changes.
Figure 2.1 to Figure 2.4 shows that there are no differences on a side-by-side comparison.

Figure 2.1 FT232RL and FT232RNL Pin Out

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Figure 2.2 FT232RQ and FT232RNQ Pin Out

Figure 2.3 FT245RL and FT245RNL Pin Out

Figure 2.4 FT245RQ and FT245RNQ Pin Out

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2.3 Clock Source
The FT2xxR and FT2xxRN have three clock configuration possibilities to provide 12Mhz to thedevice:•••Internal Oscillator (default)
External Crystal
External Oscillator

2.3.1 Internal Oscillator
There are no differences if existing FT2xxR designs are using the internal oscillator.
These designs can easily migrate to FT2xxRN with no hardware changes required.
This is the default EEPROM configuration on both FT2xxR and FT2xxRN ICs.
Figure 2.5 shows that there are no external connections on the OSCI and OSCO pins.

Figure 2.5 Internal Oscillator

2.3.2 External Crystal
There are no differences if existing FT2xxR designs are using an external crystal.
These designs can easily migrate to FT2xxRN with no hardware changes required.
Figure 2.6 shows an example of this configuration but note that it doesn’t include all detail like thecrystal load capacitors to keep this simple.

Figure 2.6 External Crystal
Note: The EEPROM configuration is updated to reflect this hardware configuration. FT_PROG isused to change the EEPROM configuration. More details can be found in AN_100 Using the
FT232R/FT245R with an External Crystal or Oscillator.

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2.3.3 External Oscillator
Figure 2.7 shows an example of a hardware design which uses an external oscillator.

Figure 2.7 External Crystal Clock Source
TN_183 FT232RN / FT245RN Errata Technical Note details a hardware difference if the existing
design is using an external oscillator.
Only with this configuration, a change would be required.
Table 2.1 shows the difference with the OSCI input voltage.
FT2xxR
FT2xxRN
OSCI input voltage
3.63V
1.98V
(max)
Table 2.1 OSCI input voltage comparison
If existing FT2xxR designs are using an external oscillator with a voltage above 1.98V then those
designs would need to change. The change options are:•••Switch to the internal oscillator.
Switch to using an external crystal.
Adjust the external oscillator with an input level below 1.98V.

Note: The EEPROM configuration is updated to reflect this hardware configuration. FT_PROG isused to change the EEPROM configuration. More details can be found in AN_100 Using the
FT232R/FT245R with an External Crystal or Oscillator.

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2.4 Using 3V3OUT to Power External Circuitry
The 3V3OUT pin can be used to power external circuitry with up to 50mA current.
A requirement of USB bus powered applications is when in USB suspend mode, the application
draws a total current of less than 2.5mA. This requirement includes external logic.
To use this additional power, 3V3OUT must be gated with a Power Switching Configuration, forexample using a MOSFET which is gated by PWREN# (output is low after the device has been
configured by USB, then high during USB suspending mode). This is detailed in section 6 USB
Power Configurations of all FT2xxR and FT2xxRN Datasheets and is shown in Figure 2.8.

Figure 2.8 Power Switching Configuration
Note: This shows a power switch configuration from VBUS but the same principle applies to
3V3OUT as it’s used to supply external circuitry.
When using FT2xxR and FT2xxRN with a power switching configuration, there are no issues withthe migration. The same applies when 3V3OUT is not being used to supply external circuitry.
If a power switching configuration has not been implemented in your design to supply external
circuitry, then it doesn’t meet the specification and there can be issues with FT232RN due to low
power mode regulator configuration.
FT2xxRN regulated 3.3V output power is limit to <25mA from power up. Once startup is complete,it’s ok to power 50mA.
If your design is relying on <25mA externally from startup with no power switching configuration,
there are no issues with FT2xxRN.
If your design is relying on >25mA externally from startup with no power switching configuration,
there can be USB enumeration issues with FT2xxRN.
There are three possible workarounds:
1.
2.

3.

Delay powering up external circuitry until FT2xxRN is powered-up for 200ms. This
could possibly be done by adjusting RC delay of external reset to your external circuit.
Disable the low power mode regulator by using a custom version of FT_PROG. This
would involve adding an additional step in your production to program the EEPROM if
this is not already being done. Please contact your local FTDI support team if you
require this custom version of FT_PROG. Also note that the external circuitry may need
to be disabled to allow programming of the FT2xxRN EEPROM over USB.
Modify your design to add MOSFET power gating using PWREN# with 10Kohm external
pullup, instead of directly connecting 3V3OUT to power external circuitry. This would
involve a re-design of your hardware so is not a drop-in replacement option.

Option 3 is preferred by FTDI to ensure that your design meets the specification.
However, in cases where a redesign is not possible, you can consider options 1 and 2.
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3 Software
No software changes are required when migrating from FT2xxR to FT2xxRN.
The same application software can be used.
The same drivers can be used. The latest driver versions can be found on the FTDI website:
https://ftdichip.com/drivers/.

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4 Conclusion
This document shows how to migrate from FT2xxR to FT2xxRN.
The main case when a hardware change is required is if the current FT2xxR design uses anexternal oscillator with a voltage above 1.98V.
No hardware changes are required if the current FT2xxR design uses the internal oscillator orexternal crystal.
An additional hardware change may be required as detailed in section 2.4 , although anotheralternative is offered to avoid hardware design changes.
Improvements to the FT2xxRN design has also removed the requirement for an external clock if
VCC was below 4V so existing designs can simplify further.
No software or driver changes are required.

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5 Contact Information
Head Office – Glasgow, UK

Branch Office – Tigard, Oregon, USA

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

Future Technology Devices International Limited(USA)
7130 SW Fir Loop
Tigard, OR 97223-8160
USA
Tel: +1 (503) 547 0988
Fax: +1 (503) 547 0987

E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)

sales1@ftdichip.com
support1@ftdichip.com
admin1@ftdichip.com

E-Mail (Sales)
E-Mail (Support)
E-Mail (General Enquiries)

us.sales@ftdichip.com
us.support@ftdichip.com
us.admin@ftdichip.com

Branch Office – Taipei, Taiwan

Branch Office – Shanghai, China

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

Future Technology Devices International Limited(China)Room 1103, No. 666 West Huaihai Road,
Shanghai, 200052
China
Tel: +86 21 62351596
Fax: +86 21 62351595

E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)

E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)

tw.sales1@ftdichip.com
tw.support1@ftdichip.com
tw.admin1@ftdichip.com

cn.sales@ftdichip.com
cn.support@ftdichip.com
cn.admin@ftdichip.com

Web Site
http://ftdichip.com

Distributor and Sales Representatives
Please visit the Sales Network page of the FTDI Web site for the contact details of ourdistributor(s) and sales representative(s) in your country.

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, thisinformation 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 theuser agrees to defend, indemnify, and hold harmless FTDI from any and all damages, claims, suits, or expense resulting fromsuch 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 productdescribed 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

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Appendix A - References
Document References
TN_183 FT232RN / FT245RN Errata Technical Note
AN_100 Using the FT232R/FT245R with an External Crystal or Oscillator
FT_PROGhttps://ftdichip.com/drivers/
New FT2xxRN Product Pages:
https://ftdichip.com/products/ft232rnq/
https://ftdichip.com/products/ft232rnl/
https://ftdichip.com/products/ft245rnq/
https://ftdichip.com/products/ft245rnl/
New FT2xxRN Datasheets:
FT232RN Datasheet
FT245RN Datasheet
Original FT2xxR Product Pages:
https://ftdichip.com/products/ft232rq/
https://ftdichip.com/products/ft232rl/
https://ftdichip.com/products/ft245rq/
https://ftdichip.com/products/ft245rl/
Original FT2xxRN Datasheets:
FT232R Datasheet
FT245R Datasheet

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Acronyms and Abbreviations
Terms

Description

CMOS

Complementary Metal Oxide Semiconductor

EEPROM

Electrically Erasable Programmable Read Only Memory

FIFO

First In First Out

ICs

Integrated Circuits

LDO

Low-Dropout Regulator

TTLTransistor-Transistor Logic

MOSFET

Metal Oxide Semiconductor Field Effect Transistor

UART

Universal Asynchronous Receiver Transmitter

USB

Universal Serial Bus

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Appendix B – List of Tables & Figures
List of Tables
Table 1.1 Part Number Summary .......................................................................................... 2
Table 1.2 Part Revisions....................................................................................................... 2
Table 1.3 FT232R/FT232RN Part Comparison .......................................................................... 4
Table 1.4 FT245R/FT245RN Part Comparison .......................................................................... 5
Table 1.5 USB-IF Test-IDs (TID) ........................................................................................... 5
Table 2.1 OSCI input voltage comparison ............................................................................... 9

List of Figures
Figure 2.1 FT232RL and FT232RNL Pin Out............................................................................. 6
Figure 2.2 FT232RQ and FT232RNQ Pin Out ........................................................................... 7
Figure 2.3 FT245RL and FT245RNL Pin Out............................................................................. 7
Figure 2.4 FT245RQ and FT245RNQ Pin Out ........................................................................... 7
Figure 2.5 Internal Oscillator ................................................................................................ 8
Figure 2.6 External Crystal ................................................................................................... 8
Figure 2.7 External Crystal Clock Source ................................................................................ 9
Figure 2.8 Power Switching Configuration ............................................................................ 10

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Appendix C – Revision History
Document Title:

AN_560 Migrating from FT2xxR to FT2xxRNDocument Reference No.:

FT_001543

Clearance No.:

FTDI#576

Product Page:

https://ftdichip.com/product-category/products/ic/

Document Feedback:Send Feedback

Revision

ChangesDate

1.0

Initial Release18-10-2022

1.1

Updated Figure 2.1 label only

14-12-2022

1.2

Added section 2.4 Using 3V3OUT to Power External
Circuitry

27-07-2023

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