Part Number: FT245BL-REEL

Manufacturer: FTDI, Future Technology Devices International Ltd

Description: IC USB FIFO 32LQFP

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of FT245BL-REEL

Datasheet  FT245BL-REEL datasheet
Category Integrated Circuits (ICs)
Family Specialized ICs
Manufacturer FTDI, Future Technology Devices International Ltd
Packaging Tape & Reel (TR)
Part Status Active
Type *
Applications *
Mounting Type Surface Mount
Package / Case 32-LQFP
Supplier Device Package 32-LQFP (7×7)

FT245BL-REEL Introduction

The FT245BL-REEL is a USB FIFO chip that provides parallel interface communication between a USB host and a device. A top provider of USB connectivity solutions, FTDI, makes this chip.

The FT245BL-REEL has a number of features, including a 2-wire serial interface for device configuration, a 32-bit FIFO data bus for quick data transfer, and a USB 2.0 interface with up to 480Mbps of data transfer speed. Also, it has a number of sophisticated features like a programmable data transfer size, a choice of clock choices, and separate receive and transmit clocks.

Applications for the FT245BL-REEL include data acquisition, test and measurement, industrial control systems, and point-of-sale terminals. It is a flexible and adaptable USB connectivity solution that provides dependable and quick data transfer in a small, affordable design.

General Description

The FT245BL is a highly effective and economical device for data transfer between a host PC and a peripheral. It boasts blazing-fast speed that is sure to impress with a maximum data transfer rate of 8 million bits (1 megabyte) per second. The device’s straightforward, FIFO-like design makes it simple to connect to any CPU or microcontroller via IO ports.

Simply write the byte-wide data into the module when TXE# is low to communicate data from the peripheral to the host computer. The transmit buffer, which has a storage capacity of up to 384 bytes, makes sure that the previously written data is preserved as the device sends data to the host over USB.

When the host provides data over USB, the device will take RXF# low to notify the peripheral that at least one byte is accessible. RXF# is low when the peripheral can read a byte and high when it has.

The device presents itself to the application software as a typical COM port by using FTDI’s virtual COM port drivers. Regardless of the application’s baud-rate setting, it ignores orders to set the baud rate and transfers data as quickly as it can. A published DLL-based API makes it possible for application applications to directly access the device using FTDI’s D2XX drivers as an alternative.

Overall, the FT245BL is a dependable and high-performance component that facilitates quick and effective data transfer between a host PC and a peripheral. It’s an excellent choice for a wide variety of applications thanks to its straightforward architecture and compatibility with a wide selection of microcontrollers and microprocessors.


● Integrated Power-On-Reset (POR) Circuit

An internal Power-On-Reset (POR) circuit has been added to the device’s most recent iteration to improve it. During power-up or power-down cycles, this cutting-edge function makes sure the device is reset to a stable state, preventing data corruption or other undesirable behavior.

While the former RESET# pin is still intact, many applications can now make use of it without connecting it to anything, such as the VCC supply. As no external circuitry is required to reset the device, a simpler and more streamlined design approach is now possible.

Moreover, the redesigned POR circuit has an extra reset output pin (RSTOUT#) that is intended to deliver a reliable reset signal to external microcontrollers and devices. This RSTOUT# pin, which was formerly used for testing in devices from an earlier generation, is now used for this very important task.

An internal POR circuit has been integrated into the device, which is a significant upgrade that raises the gadget’s dependability, performance, and usability. Users may be sure of a smooth and trouble-free experience during power-up or power-down cycles thanks to these enhanced features.

● Integrated RCCLK Circuit

The oscillator and clock multiplier PLL frequency stability of the newest device is significantly better than that of the older models. In earlier iterations, the device’s internal clock had to be enabled first to assure stability, which called for an external RC circuit.

The necessity for an external RC circuit is no longer necessary because this cutting-edge feature has been implemented on-chip. Instead, the pin that was previously tasked with performing this function has been renamed the TEST pin and should be connected to GND in order to function normally.

This improvement makes the device’s design substantially simpler and requires fewer external components, increasing its usability and lowering its cost. Overall, the addition of this technology on-chip improves the device’s functionality and performance significantly and guarantees that users will have a more dependable and stable experience.

● Integrated Level Converter on FIFO interface and control signals

The device may now directly interface with a wider range of logic families, including 3.3V, without the use of extra level converter ICs thanks to the introduction of a distinct VCCIO pin.

Users can now interface the device with a wider variety of devices and systems thanks to the addition of the VCCIO pin without worrying about level conversion problems. This improvement also makes the device’s design simpler and lowers the number of components and total cost.

In conclusion, the addition of the dedicated VCCIO pin in the most recent iteration of the device is a significant improvement that enables the device to interface with a larger range of logic families and offers the user more flexibility and convenience of use.

● Functional Block Descriptions

The output buffers of the USB transceiver cells are driven by a reference voltage of 3.3 volts, which is generated by the 3.3V LDO Regulator. The 3V3OUT output pin on the regulator must have an external decoupling capacitor connected to it. 3.3V also powers RSTOUT#. Instead of external logic, this block powers the USB Transceiver and Reset Generator Cells. The 3V3OUT pin can supply power to internal circuitry if necessary, but external circuitry requiring 3.3V nominal at a current of less than 5mA can also use it.


The USB DPLL cell locks onto the NRZI USB data coming in and sends the SIE block distinct recovered clock and data signals.

  • USB Protocol Engine

The USB Protocol Engine controls the data stream for the device’s USB control endpoint. It responds to queries from the USB host controller’s low-level protocol and directives to change the FIFO’s operational parameters.


FT245BL-REEL is a highly adaptable USB FIFO chip that provides a dependable and effective solution for a variety of applications demanding high-speed data transfer. It is the perfect option for high-performance systems thanks to its remarkable data transfer rate, big buffer size, and wide I/O voltage range.

The FT245BL-REEL is unquestionably an option to take into consideration if you’re looking for a trustworthy and effective USB FIFO chip for your project. It is a fantastic option for a variety of applications due to its strong features and technological specs. This chip can offer your system exceptional performance and durability with careful design and good integration.

Don’t pass up the chance to use this chip’s power for your project! Excellent customer service and a reliable source of premium electronic components can be found at ICRFQ. To find out more about the FT245BL-REEL or any other electrical parts you might require for your project, get in touch with us right away.

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