MPC8323E_10 datasheet(8/82 Pages) FREESCALE

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MPC8323E PowerQUICC™ II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3

Freescale Semiconductor

Electrical Characteristics

2.1.3

Output Driver Characteristics

Table 3 provides information on the characteristics of the output driver strengths. The values are

preliminary estimates.

2.1.4

Input Capacitance Specification

Table 4 describes the input capacitance for the CLKIN pin in the MPC8323E.

2.2

Power Sequencing

The device does not require the core supply voltage (VDD) and IO supply voltages (GVDD and OVDD) to

be applied in any particular order. Note that during power ramp-up, before the power supplies are stable

and if the I/O voltages are supplied before the core voltage, there might be a period of time that all input

and output pins are actively driven and cause contention and excessive current. In order to avoid actively

driving the I/O pins and to eliminate excessive current draw, apply the core voltage (VDD) before the I/O

voltage (GVDD and OVDD) and assert PORESET before the power supplies fully ramp up. In the case

where the core voltage is applied first, the core voltage supply must rise to 90% of its nominal value before

the I/O supplies reach 0.7 V; see Figure 3. Once both the power supplies (I/O voltage and core voltage) are

stable, wait for a minimum of 32 clock cycles before negating PORESET.

Note that there is no specific power down sequence requirement for the device. I/O voltage supplies

(GVDD and OVDD) do not have any ordering requirements with respect to one another.

Table 3. Output Drive Capability

Driver Type

Output Impedance

(

Ω)

Supply

Voltage

Local bus interface utilities signals

OVDD = 3.3 V

PCI signals

DDR1 signal

GVDD = 2.5 V

DDR2 signal

GVDD = 1.8 V

DUART, system control, I2C, SPI, JTAG

OVDD = 3.3 V

GPIO signals

OVDD = 3.3 V

Table 4. Input Capacitance Specification

Parameter/Condition

Symbol

Min

Max

Unit

Notes

Input capacitance for all pins except CLKIN

—

Input capacitance for CLKIN

CICLKIN

—

Note:

1. The external clock generator should be able to drive 10 pF.

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