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FT245BL Datasheet(PDF) 8 Page - Future Technology Devices International Ltd.

Part # FT245BL
Description  USB FIFO ( USB - Parallel ) I.C.
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Manufacturer  FTDI [Future Technology Devices International Ltd.]
Direct Link  http://www.ftdichip.com
Logo FTDI - Future Technology Devices International Ltd.

FT245BL Datasheet(HTML) 8 Page - Future Technology Devices International Ltd.

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DS245BL Version 1.7
© Future Technology Devices Intl. Ltd. 2005
Page 8 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
4.1 Signal Descriptions
Table 1 - FT245BL - PINOUT DESCRIPTION
FIFO DATA BUS GROUP (*** Note 1)
Pin#
Signal
Type
Description
25
DO
I/O
FIFO Data Bus Bit 0
24
D1
I/O
FIFO Data Bus Bit 1
23
D2
I/O
FIFO Data Bus Bit 2
22
D3
I/O
FIFO Data Bus Bit 3
21
D4
I/O
FIFO Data Bus Bit 4
20
D5
I/O
FIFO Data Bus Bit 5
19
D6
I/O
FIFO Data Bus Bit 6
18
D7
I/O
FIFO Data Bus Bit 7
FIFO CONTROL INTERFACE GROUP
Pin#
Signal
Type
Description
16
RD#
IN
Enables Current FIFO Data Byte on D0..D7 when low. Fetches the next FIFO
Data Byte (if available) from the Receive FIFO Buffer when RD# goes from low
to high. ***
Note 1
15
WR
IN
Writes the Data Byte on the D0..D7 into the Transmit FIFO Buffer when WR goes
from high to low. ***
Note 1
14
TXE#
OUT
When high, do not write data into the FIFO. When low, data can be written into
the FIFO by strobing WR high then low. ***
Note 2
12
RXF#
OUT
When high, do not read data from the FIFO. When low, there is data available in
the FIFO which can be read by strobing RD# low then high again ***
Note 2
USB INTERFACE GROUP
Pin#
Signal
Type
Description
7
USBDP
I/O
USB Data Signal Plus (Requires 1.5K pull-up to 3V3OUT or RSTOUT#)
8
USBDM
I/O
USB Data Signal Minus
EEPROM INTERFACE GROUP
Pin#
Signal
Type
Description
32
EECS
I/O
EEPROM – Chip Select. For 48MHz operation pull EECS to GND using a 10K
resistor. For 6MHz operation no resistor is required. ***
Note 3
1
EESK
OUT
Clock signal to EEPROM. Adding a 10K pull down resistor onto EESK will cause
the FT245BL to use USB Product ID 6005 (hex) instead of 6001 (hex). All of the
other USB device descriptors are unchanged. ***
Note 3
2
EEDATA
I/O
EEPROM – Data I/O Connect directly to Data-In of the EEPROM and to Data-
Out of the EEPROM via a 2.2K resistor. Also pull Data-Out of the EEPROM to
VCC via a 10K resistor for correct operation. ***
Note 3


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