FT232BL

The FT232BL is the lead free version of the 2nd  generation of FTDI's popular USB UART I.C.FT232BL not only adds extra functionality to its FT8U232AM predecessor and reduces external component count, but also maintains a high degree of pin compatibility with the original, making it easy to upgrade or cost reduce existing designs as well as increasing the potential for using the FT232BL in new application areas.In the previous device, the receive buffer timeout used to flush remaining data from the receive buffer was fixed at 16ms timeout.This timeout is now programmable over USB in 1ms increments from 1ms to 255ms, thus allowing the device to be better optimised for protocols requiring faster response times from short data packets.

Features of the FT232BL are:(1)single chip USB -asynchronous serial data transfer; (2)full handshaking & modem interface signals;(3)UART I/F supports 7/8 bit data, 1/2 stop bits and odd/even/mark/space/No parity;(4)adjustable RX buffer timeout; (5)fully assisted hardware or X-On/X-Off handshaking;(6)in-built support for event characters and line break condition;(7)auto transmit Buffer control for RS485;(8)integrated level converter on UART and control signals for interfacing to 5V and 3.3V logic;(9)integrated 3.3V regulator for USB IO;(10)integrated power-on-reset circuit;(11)integrated 6MHz48Mhz clock multiplier PLL; (12)USB bulk or isochronous data transfer modes;(13)4.35V to 5.25V single supply operation;(14)UHCI/OHCI/EHCI host controller compatible; (15)USB 1.1 and USB 2.0 compatible ; (16)USB VID, PID, serial number and product description strings in external EEPROM; (17)EEPROM programmable on-board via USB; (18)compact lead free RoHS compliant 32-LD LQFP. 

The absolute maximum ratings of the FT232BL can be summarized as:(1)VCC supply voltage:-0.5 to +6.00 V;(2)storage temperature:-65 to +150;(3)ambient temperature (power applied):0 to 70;(4)power dissipation: 500 mW;(5)DC output current-outputs:24mA.There are two varieties of these EEPROM's on the marketone is configured as being 16 bits wide, the other is configured as being 8 bits wide.These are available from many sources such as Microchip, STMicro, ISSI etc.The FT232BL requires EEPROM's with a 16-bit wide configuration such as the Microchip 93LC46B device. The EEPROM must be capable of reading data at a 1Mb clock rate at a supply voltage of 4.35V to 5.25V. Most available parts are capable of this.