Datasheet

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor 7
Clock Input Timing
This table describes a typical scenario where blocks with the stated percentage of utilization and
impedances consume the amount of power described.
1
4 Clock Input Timing
This section provides the clock input DC and AC electrical characteristics for the device.
4.1 DC Electrical Characteristics
This table provides the system clock input (SYS_CLK_IN) DC electrical specifications for the device.
This table provides the RTC clock input (RTC_PIT_CLOCK) DC electrical specifications for the device.
4.2 AC Electrical Characteristics
The primary clock source for the device is SYS_CLK_IN. This table provides the system clock input
(SYS_CLK_IN) AC timing specifications for the device.
Table 5. MPC8308 Typical I/O Power Dissipation
Interface Parameter
GV
DD
(1.8 V)
NV
DD
(3.3 V)
LV
DD
/
(3.3 V)
LV
DD
(2.5 V)
Unit Comments
DDR2
R
s
= 22 
R
t
= 75 
250 MHz
32 bits+ECC
266 MHz
32 bits+ECC
0.302
0.309
———W—
Local bus I/O load = 20 pF 62.5 MHz
66 MHZ
—0.038
0.040
——W—
TSEC I/O load = 20 pF MII, 25 MHz — — 0.008 — W 2 controllers
RGMII, 125 MHz — — 0.078 0.044 W
eSDHC IO Load = 40 pF 50 MHz — — 0.008 — W —
USB IO Load = 20 pF 60 MHz — — 0.012 W —
Other I/O — — 0.017 — — W —
Table 6. SYS_CLK_IN DC Electrical Characteristics
Parameter Condition Symbol Min Max Unit
Input high voltage — V
IH
2.4 NV
DD
+0.3 V
Input low voltage — V
IL
–0.3 0.4 V
SYS_CLK_IN input current 0 V  V
IN
 NV
DD
I
IN
—±10A
Table 7. RTC_PIT_CLOCK DC Electrical Characteristics
Parameter Condition Symbol Min Max Unit
Input high voltage — V
IH
3.3 V – 400 mV V
Input low voltage — V
IL
00.4V