MPC7448 datasheet(38/60 Pages) FREESCALE

Part #	MPC7448

Description	RISC Microprocessor Hardware Specifications

PDF	60 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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38 / 60 page

MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4

Freescale Semiconductor

System Design Information

These requirements are shown graphically in Figure 16.

Figure 16. MPC7448 Power Up Sequencing Requirements

Certain stipulations also apply to the manner in which the power rails of the MPC7448 power down, as

follows:

•OVDD may ramp down any time before or after VDD.

•

The voltage at the SYSCLK input must not exceed VDD once VDD has ramped down below 0.9 V.

•

The voltage at the SYSCLK input must not exceed OVDD by more 20% during transients (see

overshoot/undershoot specifications in Figure 2) or 0.3 V DC (see Table 2) at any time.

AVDD

VDD

OVDD

SYSCLK

0.9 V

no restrictions between OVDD and VDD

0.9 V

limit imposed by VDD if OVDD ramps up first

limit imposed by OVDD if VDD ramps up first

100

μs (nominal) delay from VDD to AVDD

MPC7448 Datasheet(PDF) 38 Page - Freescale Semiconductor, Inc