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FT245R Datasheet(PDF) 11 Page - Future Technology Devices International Ltd. |
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FT245R Datasheet(HTML) 11 Page - Future Technology Devices International Ltd. |
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11 / 37 page  Copyright © 2010 Future Technology Devices International Limited 11 Document No.: FT_000052 FT245R USB FIFO IC Datasheet Version 2.10 Clearance No.: FTDI# 39 Pin No. Name Type Description 1 VCCIO PWR +1.8V to +5.25V supply for the FIFO Interface group pins (2, 3, 6,7,8,9,10 11, 21, 22, 30,31,32). In USB bus powered designs connect this pin to 3V3OUT to drive out at +3.3V levels, or connect to VCC to drive out at +5V CMOS level. This pin can also be supplied with an external +1.8V to +2.8V supply in order to drive out at lower levels. It should be noted that in this case this supply should originate from the same source as the supply to VCC. This means that in bus powered designs a regulator which is supplied by the +5V on the USB bus should be used. 4, 17, 20 GND PWR Device ground supply pins. 16 3V3OUT Output +3.3V output from integrated LDO regulator. This pin should be decoupled to ground using a 100nF capacitor. The purpose of this output is to provide the internal +3.3V supply to the USB transceiver cell and the internal 1.5kΩ pull up resistor on USBDP. Up to 50mA can be drawn from this pin to power external logic if required. This pin can also be used to supply the VCCIO pin. 19 VCC PWR +3.3V to +5.25V supply to the device core. (see Note 1). 24 AGND PWR Device analogue ground supply for internal clock multiplier. Table 3.6 Power and Ground Group Pin No. Name Type Description 5, 12, 13, 23, 25, 29 NC NC No internal connection. Do not connect. 18 RESET# Input Active low reset. Can be used by an external device to reset the FT245R. If not required can be left unconnected, or pulled up to VCC. 26 TEST Input Puts the device into IC test mode. Must be tied to GND for normal operation, otherwise the device will appear to fail. 27 OSCI Input Input 12MHz Oscillator Cell. Optional – Can be left unconnected for normal operation. (see Note 2). 28 OSCO Output Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected for normal operation if internal Oscillator is used. (see Note 2). Table 3.7 Miscellaneous Signal Group Pin No. Name Type Description 30 D0 I/O FIFO Data Bus Bit 0 31 D4 I/O FIFO Data Bus Bit 4 32 D2 I/O FIFO Data Bus Bit 2 2 D1 I/O FIFO Data Bus Bit 1 3 D7 I/O FIFO Data Bus Bit 7 |
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