參數(shù)資料
型號(hào): FT245BQ
廠商: Future Technology Devices International Ltd
元件分類(lèi): 微控制器/微處理器
中文描述: SPECIALTY MICROPROCESSOR CIRCUIT, QCC32
封裝: 5 X 5 MM, LEAD FREE, QFN-32
文件頁(yè)數(shù): 3/24頁(yè)
文件大小: 995K
代理商: FT245BQ
DS245B Version 1.7
Future Technology Devices Intl. Ltd. 2005
Page 11 of 24
FT245BM USB FIFO ( USB - Parallel ) I.C.
FT245BM TIMING DIAGRAM – FIFO READ CYCLE
Time
Description
Min
Max
Unit
T1
RD Active Pulse Width
50
ns
T2
RD to RD Pre-Charge Time
50 + T6
ns
T3
RD Active to Valid Data ***
Note 4
20
50
ns
T4
Valid Data Hold Time from RD Inactive ***
Note 4 0
ns
T5
RD Inactive to RXF#
0
25
ns
T6
RXF inactive after RD cycle
80
ns
***
Note 4 - Load 30 pF
FT245BM TIMING DIAGRAM – FIFO WRITE CYCLE
Time
Description
Min
Max
Unit
T7
WR Active Pulse Width
50
ns
T8
WR to WR Pre-Charge Time
50
ns
T9
Data Setup Time before WR inactive
20
ns
T10
Data Hold Time from WR inactive
0
ns
T11
WR Inactive to TXE#
5
25
ns
T12
TXE inactive after WR cycle
80
ns
valid data
TXE#
T7
T8
T12
T9
T10
T11
WR
D0..D7
RD#
RXF#
valid data
T1
T2
T6
T3
T4
T5
OBSOLETE
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