![Freescale Semiconductor MPC8349E PowerQUICC II Pro Скачать руководство пользователя страница 32](http://html1.mh-extra.com/html/freescale-semiconductor/mpc8349e-powerquicc-ii-pro/mpc8349e-powerquicc-ii-pro_hardware-specifications_2330552032.webp)
MPC8349E PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications, Rev. 10
32
Freescale Semiconductor
USB
9
USB
This section provides the AC and DC electrical specifications for the USB interface of the MPC8349E.
9.1
USB DC Electrical Characteristics
Table 31
provides the DC electrical characteristics for the USB interface.
9.2
USB AC Electrical Specifications
Table 32
describes the general timing parameters of the USB interface of the MPC8349E.
Table 31. USB DC Electrical Characteristics
Parameter
Symbol
Min
Max
Unit
High-level input voltage
V
IH
2
OV
DD
+ 0.3
V
Low-level input voltage
V
IL
–0.3
0.8
V
Input current
I
IN
—
±5
μ
A
High-level output voltage, I
OH
= –100
μ
A
V
OH
OV
DD
– 0.2
—
V
Low-level output voltage, I
OL
= 100
μ
A
V
OL
—
0.2
V
Table 32. USB General Timing Parameters
Parameter
Symbol
1
Min
Max
Unit
Notes
USB clock cycle time
t
USCK
15
—
ns
2–5
Input setup to USB clock—all inputs
t
USIVKH
4
—
ns
2–5
Input hold to USB clock—all inputs
t
USIXKH
1
—
ns
2–5
USB clock to output valid—all outputs
t
USKHOV
—
7
ns
2–5
Output hold from USB clock—all outputs
t
USKHOX
2
—
ns
2–5
Notes:
1. The symbols for timing specifications follow the pattern of t
(first two letters of functional block)(signal)(state)(reference)(state)
for inputs
and t
(first two letters of functional block)(reference)(state)(signal)(state)
for outputs. For example, t
USIXKH
symbolizes USB timing (US) for
the input (I) to go invalid (X) with respect to the time the USB clock reference (K) goes high (H). Also, t
USKHOX
symbolizes
USB timing (US) for the USB clock reference (K) to go high (H), with respect to the output (O) going invalid (X) or output hold
time.
2. All timings are in reference to USB clock.
3. All signals are measured from OV
DD
/2 of the rising edge of the USB clock to 0.4
×
OV
DD
of the signal in question for 3.3 V
signaling levels.
4. Input timings are measured at the pin.
5. For active/float timing measurements, the Hi-Z or off-state is defined to be when the total current delivered through the
component pin is less than or equal to that of the leakage current specification.