MPC885ZP80 datasheet(12/87 Pages) NXP

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MPC885/MPC880 PowerQUICC Hardware Specifications, Rev. 7

Freescale Semiconductor

Thermal Calculation and Measurement

For the following discussions, PD= (VDDL × IDDL) + PI/O, where PI/O is the power dissipation of the I/O

drivers.

NOTE

The VDDSYN power dissipation is negligible.

7.1

Estimation with Junction-to-Ambient Thermal Resistance

An estimation of the chip junction temperature, T

J, in °C can be obtained from the following equation:

TJ = TA + (RθJA × PD)

where:

TA = ambient temperature (ºC)

RθJA = package junction-to-ambient thermal resistance (ºC/W)

PD = power dissipation in package

The junction-to-ambient thermal resistance is an industry standard value that provides a quick and easy

estimation of thermal performance. However, the answer is only an estimate; test cases have demonstrated

that errors of a factor of two (in the quantity TJ – TA) are possible.

Output high voltage, IOH = –2.0 mA, except XTAL and open-drain pins

VOH

2.4

—

Output low voltage

IOL = 2.0 mA (CLKOUT)

IOL = 3.2 mA

IOL = 5.3 mA

IOL = 7.0 mA (TXD1/PA14, TXD2/PA12)

IOL = 8.9 mA (TS, TA, TEA, BI, BB, HRESET, SRESET)

VOL

—0.5

1 The difference between V

DDL and VDDSYN cannot be more than 100 mV.

2 The signals PA[0:15], PB[14:31], PC[4:15], PD[3:15], PE(14:31), TDI, TDO, TCK, TRST, TMS, MII1_TXEN, MII_MDIO are 5-V

tolerant. The minimum voltage is still 2.0 V.

3 V

IL(max) for the I

2C interface is 0.8 V rather than the 1.5 V as specified in the I2C standard.

4 Input capacitance is periodically sampled.

5 A(0:31), TSIZ0/REG, TSIZ1, D(0:31), IRQ(2:4), IRQ6, RD/WR, BURST, IP_B(3:7), PA(0:11), PA13, PA15, PB(14:31),

PC(4:15), PD(3:15), PE(14:31), MII1_CRS, MII_MDIO, MII1_TXEN, and MII1_COL.

6 BDIP/GPL_B(5), BR, BG, FRZ/IRQ6, CS(0:7), WE(0:3), BS_A(0:3), GPL_A0/GPL_B0, OE/GPL_A1/GPL_B1,

GPL_A(2:3)/GPL_B(2:3)/CS(2:3), UPWAITA/GPL_A4, UPWAITB/GPL_B4, GPL_A5, ALE_A, CE1_A, CE2_A, OP(0:3), and

BADDR(28:30).

Table 6. DC Electrical Specifications (continued)

Characteristic

Symbol

Min

Max

Unit

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