USB
9 USB
This section provides the AC and DC electrical specifications for the USB interface of the MPC8347EA.
9.1
USB DC Electrical Characteristics
Table 35 provides the DC electrical characteristics for the USB interface.
Table 35. USB DC Electrical Characteristics
Parameter
Symbol
Min
Max
Unit
High-level input voltage
Low-level input voltage
Input current
VIH
VIL
2
–0.3
OVDD + 0.3
V
V
0.8
5
IIN
—
μA
V
High-level output voltage, IOH = –100 μA
Low-level output voltage, IOL = 100 μA
VOH
VOL
OVDD – 0.2
—
—
0.2
V
9.2
USB AC Electrical Specifications
Table 36 describes the general timing parameters of the USB interface of the MPC8347EA.
Table 36. USB General Timing Parameters (ULPI Mode Only)
Parameter
Symbol1
Min
Max
Unit
Notes
USB clock cycle time
tUSCK
tUSIVKH
tUSIXKH
tUSKHOV
tUSKHOX
15
4
—
—
—
7
ns
ns
ns
ns
ns
2–5
2–5
2–5
2–5
2–5
Input setup to USB clock—all inputs
Input hold to USB clock—all inputs
USB clock to output valid—all outputs
Output hold from USB clock—all outputs
Notes:
1
—
2
—
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, tUSIXKH 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, tUSKHOX 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 OVDD/2 of the rising edge of the USB clock to 0.4 × OVDD 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.
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 12
Freescale Semiconductor
35
FREESCALE [ Freescale ]
