Renesas HD6417641 用户手册
Section 25 Electrical Characteristics
Rev. 4.00 Sep. 14, 2005 Page 962 of 982
REJ09B0023-0400
25.3.13 USB Module Signal Timing
Table 25.14 USB Module Clock Timing
Conditions: V
CC
= 1.8 V
±5%, V
CC
Q = 3.0 V to 3.6 V, AV
CC
= 3.0 V to 3.6 V, V
SS
= V
SS
Q = AV
SS
= 0 V, Ta =
−40°C to +85°C
Item Symbol
Min.
Max.
Unit
Figure(s)
Frequency (48 MHz)
t
FREQ
47.9 48.1 MHz 25.55
Clock rising time
t
RAS
— 4 ns
Clock falling time
t
FAS
— 4 ns
Duty cycle (t
HIGH
/t
LOW
) t
DUTY
90 110 %
t
HIGH
t
LOW
t
FREQ
10%
t
RAS
t
FAS
90%
UCLK
Figure 25.55 USB Clock Timing