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23 ELECTRICAL CHARACTERISTICS
RFC reference/sensor oscillation frequency-
temperature characteristic
R
/R
= 100 kW, C
= 1,000 pF, Typ. value
REF
SEN
REF
18
16
14
12
10
8
6
4
2
0
-50
-25
0
23.15 USB 2.0 FS Device Controller (USB) Characteristics
Unless otherwise specified: V
DD
Item
High level Schmitt input trigger voltage
Low level Schmitt input trigger voltage
Differential input sensitivity
Pull-up resistance
High level output resistance
Low level output resistance
Input/output pin capacitance
PLL lock-up time
1.8 V/3.3 V regulator output stabilization time t
USB circuit current
*1 Current flowing through the V
USB circuit curent-V
BUS
USBMISCCTL.USBCLKSEL bit = 0, Ta = 25 °C, Typ. value
10
8
6
4
2
0
4.2
4.4
4.6
23-16
V
= 3.6 V
DD
1.8 V
25
50
75
100
Ta [°C]
= 1.8 to 3.6 V, V
= 4.4 to 5.25 V, V
BUS
Symbol
V
T+(USB)
V
T-(USB)
V
Common voltage = 0.8 to 2.5 V
DSU
R
V
= V
PLUU
I
R
OHUF
R
OLUF
C
f = 1 MHz
BU
t
LOCK
C
1–2 = 1 µF, load current = 1 mA
REGOUT
USB
I
USBMISCCTL.USBCLKSEL bit = 0,
USB
Ta = 25 °C
pin in HID device class (1 transfer per ms)
BUS
voltage characteristic
4.8
5.0
5.2
5.4
V
[V]
BUS
Seiko Epson Corporation
RFC reference/sensor oscillation current
consumption-frequency characteristic
C
= 1,000 pF, Ta = 25 °C, Typ. value
REF
1,800
1,600
1,400
1,200
1,000
800
600
400
200
0
0.1
1
= 0 V, Ta = -40 to 85 °C
SS
Condition
SS
*1
V
= 3.6 V
DD
1.8 V
10
100
1,000
10,000
f
[kHz]
RFCLK
Min.
Typ.
Max.
–
–
2.00
0.80
–
–
0.20
–
–
1.425
–
1.575
40.5
–
49.5
40.5
–
49.5
–
–
15
–
–
3
–
500
1,000
–
7.5
18
S1C31W74 TECHNICAL MANUAL
(Rev. 1.1)
Unit
V
V
V
kW
W
W
pF
ms
µs
mA
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