MPC7457 datasheet(11/68 Pages) FREESCALE

11 / 68 page

MPC7457 RISC Microprocessor Hardware Specifications, Rev. 5

Freescale Semiconductor

Electrical and Thermal Characteristics

Figure 2 shows the undershoot and overshoot voltage on the MPC7457.

Figure 2. Overshoot/Undershoot Voltage

The MPC7457 provides several I/O voltages to support both compatibility with existing systems and migration to

future systems. The MPC7457 core voltage must always be provided at nominal 1.3 V (see Table 4 for actual

recommended core voltage). Voltage to the L3 I/Os and processor interface I/Os are provided through separate sets

of supply pins and may be provided at the voltages shown in Table 3. The input voltage threshold for each bus is

selected by sampling the state of the voltage select pins at the negation of the signal HRESET. The output voltage

will swing from GND to the maximum voltage applied to the OVDD or GVDD power pins.

Storage temperature range

Tstg

–55 to 150

°C

Notes:

Functional and tested operating conditions are given in Table 4. Absolute maximum ratings are stress ratings only, and

functional operation at the maximums is not guaranteed. Stresses beyond those listed may affect device reliability or cause

permanent damage to the device.

Caution: VDD/AVDD must not exceed OVDD/GVDD by more than 1.0 V during normal operation; this limit may be exceeded

for a maximum of 20 ms during power-on reset and power-down sequences.

Caution: OVDD/GVDD must not exceed VDD/AVDD by more than 2.0 V during normal operation; this limit may be exceeded

for a maximum of 20 ms during power-on reset and power-down sequences.

BVSEL must be set to 0, such that the bus is in 1.8-V mode.

BVSEL must be set to HRESET or 1, such that the bus is in 2.5-V mode.

L3VSEL must be set to ¬HRESET (inverse of HRESET), such that the bus is in 1.5-V mode.

L3VSEL must be set to 0, such that the bus is in 1.8-V mode.

L3VSEL must be set to HRESET or 1, such that the bus is in 2.5-V mode.

Caution: Vin must not exceed OVDD or GVDD by more than 0.3 V at any time including during power-on reset.

10. Vin may overshoot/undershoot to a voltage and for a maximum duration as shown in Figure 2.

Table 2. Absolute Maximum Ratings 1 (continued)

Characteristic

Symbol

Maximum Value

Unit

Notes

VIH

GND

GND – 0.3 V

GND – 0.7 V

Not to exceed 10%

OVDD/GVDD + 20%

VIL

OVDD/GVDD

OVDD/GVDD + 5%

of tSYSCLK

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