FT245BL Datasheet, PDF (8/24 Pages) List of Unclassifed Manufacturers – 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
FT245BL USB FIFO ( USB - Parallel ) I.C.
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
7
USBDP
I/O
8
USBDM
I/O
Description
USB Data Signal Plus (Requires 1.5K pull-up to 3V3OUT or RSTOUT#)
USB Data Signal Minus
EEPROM INTERFACE GROUP
Pin# Signal
Type
32
EECS
I/O
1
EESK
OUT
2
EEDATA
I/O
Description
EEPROM – Chip Select. For 48MHz operation pull EECS to GND using a 10K
resistor. For 6MHz operation no resistor is required. *** Note 3
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
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
DS245BL Version 1.6 © Future Technology Devices Intl. Ltd. 2005
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