Res. [1]

[24] VCC

Res. [2]

[23] FILTER_VCC

Res. [3]

[22] USB_VCC

SD7 [4]

[21] DM

SD6 [5]

[20] DP

SD5 [6]

[19] GND

SD4 [7]

[18] TXE#

SD3 [8]

[17] WRITE

SD2 [9]

[16] READ#

SD1 [10]

[15] RESET#

SD0 [11]

[14] RXF#

GND [12]

[13] RCCLK

Res.

Reserved, Unconnected. Do not use.

SD(0..7)

Data Bus. Driven when READ# is asserted.

Data inputs when WRITE is asserted.

RCCLK

Output of the onboard RC Timer.

RXF#

Active low output. When asserted, receive

data is available, and can be read from FIFO.

RESET#

Active Low output. Remains low for 140msec

after power-up, then goes high.

READ#

Active Low input. When low, the device drives

the current receive FIFO data onto SD0-SD7.

WRITE

Input that Clocks Data at SD0-SD7 into

transmit FIFO on a High-to-Low transition.

TXE#

Active Low Output. When asserted, signifies

transmit FIFO space is available.

DP

USB Plus Data Signal.

DM

USB Minus Data Signal.

USB_VCC

Input to onboard 5volt power filter.

FILTER_VCC Output of onboard 5volt power filter.

VCC

5 Volt power input.

GND

Ground.

Pinout Information

The USB245 is small, easy to use device with all necessary

timing circuits, and power filtering built in.

Each contains a preprogrammed EEPROM which holds the

device and vendor ID codes.

The 8-bit data bus easily connects to processor data buses.

The two control bus lines (READ# and WRITE) direct data flow

from the device, while two status lines (TXE# and RXF#) give

information about the state of the internal transmit and receive

FIFOs. The status lines can also be used as interrupt sources

for the processor.

The onboard RESET# line is routed externally and can be

used to drive other circuits.

The device can be wired to derive and source power from

the USB bus, or alternatively have power sourced from the

processor interface.

•

USB ver1.1 compatible device with

a 384 byte transmit FIFO and 128

Byte receive FIFO.

•

Works with FTDI’s Virtual Com

Port (VCP) and D2XX Drivers for

Microsoft Windows.

•

Small Size: Surface Mount

Technology allows the device to fit

in standard 24 pin DIP socket.

•

Preprogrammed 93C46 EEPROM

with unique USB device information.

•

Easy to use 8-bit microcontroller-

microprocessor interface with FIFO

status lines

USB245

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