4 usb transceiver ac characteristics – Rainbow Electronics W90N740 User Manual
Page 203
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W90N740
Publication Release Date: November 26, 2004
- 199 -
Revision A4
8.3.4 USB Transceiver AC Characteristics
Low Speed: 75ns at C
L
= 50pF, 300ns at C
L
= 350pF
Full Speed: 4 to 20ns at C
L
= 50pF
Differential
Data Lines
10%
Rise Time
90%
Fall Time
t
F
t
R
10%
90%
C
L
C
L
Data Signal Rise and Fall Time
USB Transceiver AC Characteristics
SYM. DESCRIPTION
CONDITIONS
MIN.
MAX.
UNIT
T
R
Rise Time (Full Speed)
CL = 50 pF
4
20
nS
T
F
Fall Time (Full Speed
CL = 50 pF
4
20
nS
T
RFM
Rise/Fall Time Matching (Full Speed)
90
112
%
T
DRATE
Full Speed Data Rate
Average bit rate
(12 Mb/s
±0.25%)
11.97 12.03 Mbps
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