31 ELECTRICAL CHARACTERISTICS
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
31-25
Terminations
Unless otherwise specified: LV
DD
= 1.65 to 1.95V, HV
DD
= 3.0 to 3.6V, V
SS
= 0V, Ta = 0 to 70°C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Bus pull-up resistor on upstream facing
port (idle Bus)
*
5
R
PUI
0.9
–
1.575
k
W
Bus pull-up resistor on upstream facing
port (receiving)
*
5
V
PUA
1.425
–
3.090
k
W
*
5) Refer to ECN in the USB2.0 Specification for the conditions.
Driver characteristics
Unless otherwise specified: LV
DD
= 1.65 to 1.95V, HV
DD
= 3.0 to 3.6V, V
SS
= 0V, Ta = 0 to 70°C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Rise time
*
6
T
FR
4
–
20
ns
Fall time
*
6
T
FF
4
–
20
ns
Differential rise and fall time matching
T
FRFM
T
FR
/T
FF
90
–
111.11
%
Driver output resistance
Z
DRV
28
–
44
W
VBUS input impedance
Z
VBUS
R1 + R2
125
–
–
k
W
VBUS resistor ratio
R1 : R2
1 : 2 (nominal)
–
*
6) Refer to Figures 7-8 and 7-9 in the USB2.0 Specification for the conditions.