Datasheet > FT245BL

FT245BL

更新时间： 2024-01-03 03:38:02

品牌	Logo	应用领域
飞特帝亚 - FTDI		外围集成电路先进先出芯片 PC
页数	文件大小	规格书
24页	541K
描述
USB FIFO ( USB - Parallel ) I.C.

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FT245BL 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	,	Reach Compliance Code：	compliant
风险等级：	5.81	Base Number Matches：	1

FT245BL 数据手册

FT245BL USB FIFO ( USB - Parallel ) I.C.

3.0 Block Diagram ( simpliﬁed )

VCC

Send Immediate / WakeUP

PWREN#

3.3 Volt

LDO

Regulator

FIFO Receive

Buffer

128 Bytes

3V3OUT

USBDP

Serial Interface

FIFO

Controller

USB

Transceiver

USB

Protocol Engine

Engine

( SIE )

USBDM

RD#

RXF#

TXE#

FIFO Transmit

Buffer

384 Bytes

USB DPLL

3V3OUT

EECS

XTOUT

XTIN

48MHz

EEPROM

Interface

EESK

6MHZ

Oscillator

x8 Clock

Multiplier

EEDATA

12MHz

RESET

GENERATOR

GND

RESET#

RSTOUT#

TEST

3.1 Functional Block Descriptions

•

3.3V LDO Regulator

•

USB DPLL

The 3.3V LDO Regulator generates the 3.3 volt

reference voltage for driving the USB transceiver

cell output buffers. It requires an external

The USB DPLL cell locks on to the incoming NRZI

USB data and provides separate recovered clock

and data signals to the SIE block.

decoupling capacitor to be attached to the 3V3OUT

regulator output pin. It also provides 3.3V power to

the RSTOUT# pin. The main function of this block

is to power the USB Transceiver and the Reset

Generator Cells rather than to power external logic.

However, external circuitry requiring 3.3V nominal

at a current of not greater than 5mA could also

draw its power from the 3V3OUT pin if required.

6MHz Oscillator

The 6MHz Oscillator cell generates a 6MHz

reference clock input to the x8 Clock multiplier from

an external 6MHz crystal or ceramic resonator.

x8 Clock Multiplier

The x8 Clock Multiplier takes the 6MHz input

from the Oscillator cell and generates a 12MHz

reference clock for the SIE, USB Protocol Engine

and FIFO controller blocks. It also generates a

48MHz reference clock for the USB DPLL.

•

USB Transceiver

The USB Transceiver Cell provides the USB 1.1 /

USB 2.0 full-speed physical interface to the USB

cable. The output drivers provide 3.3 volt level slew

rate control signalling, whilst a differential receiver

and two single ended receivers provide USB data

in, SEO and USB Reset condition detection.

DS245BL Version 1.7

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