FT245RL FTDI, FT245RL Datasheet - Page 3

IC, USB FIFO INTERFACE, SSOP-28

FT245RL

Manufacturer Part Number
FT245RL
Description
IC, USB FIFO INTERFACE, SSOP-28
Manufacturer
FTDI
Datasheet

Specifications of FT245RL

Data Rate
1Mbps
Supply Voltage Range
1.8V To 5.25V, 3.3V To 5.25V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
SSOP
No. Of Pins
28
Termination Type
SMD
Ic Generic Number
245
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Page 3
2. Enhancements
2.1 Device Enhancements and Key Features
This section summarises the enhancements and the key features of the FT245R device. For further details, consult
the
device pin-out
description and
functional description
sections.
Integrated Clock Circuit - Previous generations of FTDI’s USB to parallel FIFO interface devices required an external
crystal or ceramic resonator. The clock circuit has now been integrated onto the device meaning that no crystal or
ceramic resonator is required. However, if required, an external 12MHz crystal can be used as the clock source.
Integrated EEPROM - Previous generations of FTDI’s USB to parallel FIFO interface devices required an external
EEPROM if the device were to use USB Vendor ID (VID), Product ID (PID), serial number and product description
strings other than the default values in the device itself. This external EEPROM has now been integrated onto the
FT245R chip meaning that all designs have the option to change the product description strings. A user area of the
internal EEPROM is available for storing additional data. The internal EEPROM is programmable in circuit, over USB
without any additional voltage requirement.
Preprogrammed EEPROM - The FT245R is supplied with its internal EEPROM preprogrammed with a serial number
which is unique to each individual device. This, in most cases, will remove the need to program the device EEPROM.
Integrated USB Resistors - Previous generations of FTDI’s USB to parallel FIFO interface devices required two
external series resistors on the USBDP and USBDM lines, and a 1.5 kΩ pull up resistor on USBDP. These three
resistors have now been integrated onto the device.
Integrated AVCC Filtering - Previous generations of FTDI’s USB to parallel FIFO interface devices had a separate
AVCC pin - the supply to the internal PLL. This pin required an external R-C filter. The separate AVCC pin is now
connected internally to VCC, and the filter has now been integrated onto the chip.
Less External Components - Integration of the crystal, EEPROM, USB resistors, and AVCC filter will substantially
reduce the bill of materials cost for USB interface designs using the FT245R compared to its FT245BM predecessor.
Transmit and Receive Buffer Smoothing - The FT245R’s 256 byte receive buffer and 128 byte transmit buffer utilise
new buffer smoothing technology to allow for high data throughput.
Enhanced Asynchronous Bit Bang Mode with RD# and WR# Strobes - The FT245R supports FTDI’s BM chip bit
bang mode. In bit bang mode, the eight parallel FIFO data bus lines can be switched from the regular interface mode
to an 8-bit general purpose I/O port. Data packets can be sent to the device and they will be sequentially sent to the
interface at a rate controlled by an internal timer (equivalent to the baud rate prescaler). With the FT245R device this
mode has been enhanced so that the internal RD# and WR# strobes are now brought out of the device which can be
used to allow external logic to be clocked by accesses to the bit bang I/O bus. This option will be described more fully
in a separate application note
Synchronous Bit Bang Mode - Synchronous bit bang mode differs from asynchronous bit bang mode in that the
interface pins are only read when the device is written to. Thus making it easier for the controlling program to measure
the response to an output stimulus as the data returned is synchronous to the output data. The feature was previously
seen in FTDI’s FT2232C device. This option will be described more fully in a separate application note.
Lower Supply Voltage - Previous generations of the chip required 5V supply on the VCC pin. The FT245R will work
with a Vcc supply in the range 3.3V - 5V. Bus powered designs would still take their supply from the 5V on the USB
bus, but for self powered designs where only 3.3V is available, and there is no 5V supply, there is no longer any need
for an additional external regulator.
Integrated Level Converter on FIFO Interface and Control Signals - VCCIO pin supply can be from 1.8V to 5V.
Connecting the VCCIO pin to 1.8V, 2.8V, or 3.3V allows the device to directly interface to 1.8V, 2.8V or 3.3V and other
logic families without the need for external level converter I.C.s
5V / 3.3V / 2.8V / 1.8V Logic Interface - The FT245R provides true CMOS Drive Outputs and TTL level Inputs.
FT245R USB UART I.C. Datasheet Version 1.05
© Future Technology Devices International Ltd. 2005

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