MPC8377ECVRALDA datasheet(10/124 Pages) FREESCALE

10 / 124 page

MPC8377E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Electrical Characteristics

2.1.3

Output Driver Characteristics

Table 4 provides information on the characteristics of the output driver strengths. The values are

preliminary estimates.

2.2

Power Sequencing

The device requires its power rails to be applied in a specific sequence in order to ensure proper device

operation. During the power ramp up, before the power supplies are stable and if the I/O voltages are

supplied before the core voltage, there may be a period of time that all input and output pins will actively

be driven and cause contention and excessive current. To avoid actively driving the I/O pins and to

eliminate excessive current draw, apply the core voltages (VDD and AVDD) before the I/O voltages and

assert PORESET before the power supplies fully ramp up. VDD and AVDD must reach 90% of their

nominal value before GVDD, LVDD, and OVDD reach 10% of their value, see Figure 3. I/O voltage

supplies, GVDD, LVDD, and OVDD do not have any ordering requirements with respect to one another.

Figure 3. Power-Up Sequencing Example

Table 4. Output Drive Capability

Driver Type 1

Specialized SerDes output capabilities are described in the relevant sections of these specifications (such as PCI Express and

SATA)

Output Impedance (

Ω)

Supply Voltage

Local bus interface utilities signals

LBVDD = 2.5 V, 3.3 V

LBVDD = 1.8 V

PCI signals

OVDD = 3.3 V

DDR1 signal

GVDD = 2.5 V

DDR2 signal

GVDD = 1.8 V

eTSEC 10/100/1000 signals

LVDD = 2.5 V, 3.3 V

DUART, system control, I2C, JTAG, SPI, and USB

OVDD = 3.3 V

GPIO signals

OVDD = 3.3 V

90%

Core Voltage (VDD, AVDD)

I/O Voltage (GVDD, LVDD, and OVDD)

0.7 V

MPC8377ECVRALDA Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc

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