UM245R FTDI, Future Technology Devices International Ltd, UM245R Datasheet - Page 7

• Manufacturer Part Number: UM245R
• Description: MODULE USB-PAR FIFO TTL 24-DIP
• Manufacturer: FTDI, Future Technology Devices International Ltd

Specifications of UM245R

• Main Purpose: Interface, USB 2.0 to Parallel FIFO Bridge
• Embedded: No
• Utilized Ic / Part: FT245R
• Primary Attributes: 300kBps to 1MBps USB to parallel FIFO via 4-Wire Interface
• Secondary Attributes: Royalty-Free Drivers
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 768-1020

Document Reference No.: FT_000202
UM245R USB - Parallel FIFO Development Module Datasheet Version 1.04
Clearance No.: FTDI# 124
5V / 3.3V / 2.8V / 1.8V Logic Interface – The FT245R provides true CMOS Drive Outputs and
TTL level Inputs.
Integrated Power-On-Reset (POR) Circuit – The device incorporates an internal POR function.
A RESET# pin is available in order to allow external logic to reset the FT245R where required. With
many applications the RESET# pin can be left unconnected, or pulled up to VCCIO.
Wake Up Function – If USB is in suspend mode and remote wake up has been enabled in the
internal EEPROM (it is enabled by default), the RXF# pin becomes an input. Strobing this pin low
will cause the FT245R to request a resume from suspend on the USB bus. Normally this can be
used to wake up the host PC from suspend.
Lower Operating and Suspend Current – The device operating supply current has been further
reduced to 15mA, and the suspend current has been reduced to around 70μA. This allows a greater
margin for peripherals to meet the USB suspend current limit of 500μA (2.5mA with remote wake
up enabled).
Low USB Bandwidth Consumption – The operation of the USB interface to the FT245R has been
designed to use as little as possible of the total USB bandwidth available from the USB host
controller.
High Output Drive Option – The parallel FIFO interface and the FIFO handshake output pins can
be made to drive out at three times the standard signal drive level thus allowing multiple devices to
be driven, or devices that require greater signal drive strength to be interfaced to the FT245R. This
option is configured in the internal EEPROM.
Power Management Control for USB Bus Powered, High Current Designs – The PWREN#
signal can be used to directly drive a transistor or P-Channel MOSFET in applications where power
switching of external circuitry is required. An option in the internal EEPROM makes the device
gently pull down on its FIFO interface lines when the power is shut off (PWREN# is high). In this
mode any residual voltage on external circuitry is bled to GND when power is removed, thus
ensuring that external circuitry controlled by PWREN# resets reliably when power is restored.
FTDIChip-ID™ - unique serial number which is burnt into the device at manufacture - This
ID number cannot be reprogrammed by product manufacturers or end-users. This allows the
possibility of using FT245R based dongles for software licensing. Further to this, a renewable license
scheme can be implemented based on the FTDIChip-ID™ number when encrypted with other
information. This encrypted number can be stored in the user area of the FT245R internal EEPROM,
and can be decrypted, then compared with the protected FTDIChip-ID™ to verify that a license is
valid. Web based applications can be used to maintain product licensing this way. An application
note describing this feature is available separately from the
FTDI
website. The FTDIChip-ID is
different from the USB Serial Number as defined in the USB specification.
Improved EMI Performance – The reduced operating current and improved on-chip VCC
decoupling significantly improves the ease of PCB design requirements in order to meet FCC, CE
and other EMI related specifications.
Programmable FIFO TX Buffer Timeout – The FIFO TX buffer timeout is used to flush remaining
data from the receive buffer. This timeout defaults to 16ms, but is programmable over USB in 1ms
increments from 1ms to 255ms, thus allowing the device to be optimised for protocols that require
fast response times from short data packets.
Extended Operating Temperature Range – The FT245R operates over an extended temperature
range of -40º to +85º C thus allowing the device to be used in automotive and industrial
applications.
New Package Options – The FT245R is available in two packages - a compact 28 pin SSOP
(FT245RL) and an ultra-compact 5mm x 5mm pinless QFN-32 package (FT245RQ). Both packages
are lead (Pb) free, and use a „green‟ compound. Both packages are fully compliant with European
Union directive 2002/95/EC.
© Copyright 2009 Future Technology Devices International Ltd
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