MPC8245_07 datasheet(11/68 Pages) FREESCALE

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MPC8245 Integrated Processor Hardware Specifications, Rev. 10

Freescale Semiconductor

Electrical and Thermal Characteristics

4.2.1

Output Driver Characteristics

Table 4 provides information on the characteristics of the output drivers referenced in Table 16. The values

are preliminary estimates from an IBIS model and are not tested.

Capacitance

Vin = 0 V, f = 1 MHz

Cin

—

16.0

Notes:

1. See Table 16 for pins with internal pull-up resistors.

2. See Table 4 for the typical drive capability of a specific signal pin based on the type of output driver associated with that pin

as listed in Table 16.

3. These specifications are for the default driver strengths indicated in Table 4.

4. Leakage current is measured on input and output pins in the high-impedance state. The leakage current is measured for

nominal OVDD/LVDD, and VDD or both OVDD/LVDD and VDD must vary in the same direction.

Table 4. Drive Capability of MPC8245 Output Pins 5

Driver Type

Programmable

Output Impedance

(

Ω)

Supply

Voltage

IOH

IOL

Unit

Notes

DRV_STD_MEM

20 (default)

OVDD = 3.3 V

36.6

18.0

2, 4, 6

18.6

9.2

2, 4, 6

DRV_PCI

12.0

12.4

1, 3

40 (default)

6.1

6.3

1, 3

DRV_MEM_CTRL

6 (default)

GVDD = 3.3 V

89.0

42.3

2, 4

DRV_PCI_CLK

36.6

18.0

2, 4

DRV_MEM_CLK

18.6

9.2

2, 4

Notes:

1. For DRV_PCI, IOH read from the IBIS listing in the pull-up mode, I(Min) column, at the 0.33-V label by interpolating between

the 0.3- and 0.4-V table entries’ current values that correspond to the PCI VOH = 2.97 = 0.9 × OVDD (OVDD = 3.3 V) where

table entry voltage = OVDD – PCI VOH.

2. For all others with GVDD or OVDD = 3.3 V, IOH read from the IBIS listing in the pull-up mode, I(Min) column, at the 0.9-V table

entry that corresponds to the VOH = 2.4 V where table entry voltage = GVDD/OVDD – VOH.

3. For DRV_PCI, IOL read from the IBIS listing in the pull-down mode, I(Min) column, at 0.33 V = PCI VOL = 0 × OVDD (OVDD

= 3.3 V) by interpolating between the 0.3- and 0.4-V table entries.

4. For all others with GVDD or OVDD = 3.3 V, IOL read from the IBIS listing in the pull-down mode, I(Min) column, at the 0.4-V

table entry.

5. See driver bit details for output driver control register (0x73) in the MPC8245 Integrated Processor Reference Manual.

6. See Chip Errata No. 19 in the MPC8245/MPC8241 RISC Microprocessor Chip Errata.

Table 3. DC Electrical Specifications (continued)

At recommended operating conditions (see Table 2)

Characteristic

Condition 3

Symbol

Min

Max

Unit

Notes

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