MPC7457 datasheet(12/71 Pages) FREESCALE

12 / 71 page

MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8

Electrical and Thermal Characteristics

Freescale Semiconductor

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

Table 2. Absolute Maximum Ratings 1

Characteristic

Symbol

Maximum Value

Unit

Notes

Core supply voltage

VDD

–0.3 to 1.60

PLL supply voltage

AVDD

–0.3 to 1.60

Processor bus supply voltage

BVSEL = 0

OVDD

–0.3 to 1.95

3, 4

BVSEL = HRESET or OVDD

OVDD

–0.3 to 2.7

3, 5

L3 bus supply voltage

L3VSEL = ¬HRESET

GVDD

–0.3 to 1.65

3, 6

L3VSEL = 0

GVDD

–0.3 to 1.95

3, 7

L3VSEL = HRESET or GVDD

GVDD

–0.3 to 2.7

3, 8

Input voltage

Processor bus

Vin

–0.3 to OVDD + 0.3

9, 10

L3 bus

Vin

–0.3 to GVDD + 0.3

9, 10

JTAG signals

Vin

–0.3 to OVDD + 0.3

Storage temperature range

Tstg

–55 to 150

°C

Notes:

1. 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: V

DD/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: OV

DD/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.

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

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

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

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

8. 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.

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