FT245RL-REEL datasheet(9/37 Pages) FTDI

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Document No.: FT_000052

FT245R USB FIFO IC Datasheet Version 2.12

Clearance No.: FTDI# 39

Pin No.

Name

Type

Description

I/O

FIFO Data Bus Bit 3

PWREN#

Output

Goes low after the device is configured by USB, then high during USB suspend.

Can be used to control power to external logic P-Channel logic level MOSFET

switch. Enable the interface pull-down option when using the PWREN# pin in this

way. Should be pulled to VCCIO with 10kΩ resistor.

RD#

Input

Enables the current FIFO data byte on D0...D7 when low. Fetched the next FIFO

data byte (if available) from the receive FIFO buffer when RD# goes from high to

low. See Section 3.5 for timing diagram.

Input

Writes the data byte on the D0...D7 pins into the transmit FIFO buffer when WR

goes from high to low. See Section 3.6 for timing diagram.

TXE#

Output

When high, do not write data into the FIFO. When low, data can be written into

the FIFO by strobing WR high, then low. During reset this signal pin is tri-state.

See Section 3.6 for timing diagram.

RXF

Output

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. During reset

this signal pin is tri-state. See Section 3.5 for timing diagram.

If the Remote Wakeup option is enabled in the internal EEPROM, during USB

suspend mode (PWREN# = 1) RXF# becomes an input. This can be used to wake

up the USB host from suspend mode by strobing this pin low for a minimum of

20ms which will cause the device to request a resume on the USB bus.

Table 3.4 FIFO Interface Group (see note 3)

Notes:

1. The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) when using the

internal clock generator. Operation at +3.3V is possible using an external crystal oscillator.

2. For details on how to use an external crystal, ceramic resonator, or oscillator with the FT245R,

please refer Section 8.2

3. When used in Input Mode, the input pins are pulled to VCCIO via internal 200kΩ resistors. These

pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an

option in the internal EEPROM.

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