Renesas HD6417641 用户手册
Section 25 Electrical Characteristics
Rev. 4.00 Sep. 14, 2005 Page 963 of 982
REJ09B0023-0400
25.3.14 USB Transceiver Timing
Table 25.15 USB Transceiver 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.
Typ.
Max.
Unit
Test
Conditions
Rising time
t
R
4
20 ns C
L
= 50pF
Falling time
t
F
4 — 20
ns
C
L
= 50pF
Rising/falling time ratio
t
R
/t
F
90 — 110 %
Output crossover voltage V
CRS
1.3 — 2.0 V
C
L
= 50pF
Output driver resistance Z
DRU
28
44
Ω
Notes: 1. Transceivers conform to the full-speed specification.
2. The resistance includes the value of the externally connected resistor
(RS = 27
Ω ± 1%).
t
R
, t
F
90%
10%
DP
Crossover voltage
1. The Values of t
R
and t
F
are measured at 10% and 90% of amplitude.
2. The capacitance (C
L
) includes stray capacitance of writing connection and
probe input capacitance.
Notes:
DM
VccQ
DP
DM
VssQ
R
L
= 27
Ω
C
L
C
L
R
L
= 27
Ω
Device to be
measured
Measurement circuit