参数资料
型号: M66291GP
元件分类: 总线控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP48
封装: 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件页数: 14/126页
文件大小: 893K
代理商: M66291GP
M66291GP/HP
Rev 1.01 2004.11.01 page 110 of 122
4.8 Measurement circuit
4.8.1
Pins except for USB buffer block
4.8.2
USB buffer block
CL
R L=1k
SW 2
SW 1
CL
Elem ents to
be m easured
P.G .
R L=1k
Vcc
Input
tdis(C T RL(LZ))
tdis(C T RL(HZ))
ta(CT RL(ZL))
ta(CT RL(ZH ))
Item
SW 1
SW 2
close
open
close
open
(1) Input pulse level : 0 ~ 3.3V, 0 ~ 5.0V
Input pulse rise/fall time : tr,tf=3ns
Input timing standard voltage : IO Vcc/2
O utput timing judge voltage : IO Vcc/2
(T he tdis (LZ) is judged by 10% of the
output amplitude and the tdis (H Z) by
90% of the output amplitude.)
(2) T he electrostatic capacity C L includes
the stray capacitance of the wire
connection and the input capacitance
of the probe.
50
GND
D 15-0
D 15-0 other output
C L
D+
R L= 15k
R L=27
Vc c
R L=1.5K
C L
D-
R L= 15k
R L=27
Vc c
GN D
E lem en ts to
be m easured
(1 ) T he tr and tf are judg ed by the tran s ition tim e of
th e 10% am plitu de point and 90 % am plitud e poin t
res pec tively.
(2) T he elec tros tatic c ap ac ity C L inc ludes th e s tray
c apac itan c e of the w ire c onnec tion and the
in put c apac itanc e of th e probe.
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