MPC852T PowerQUICC™ Hardware Specifications, Re v. 4
Freescale Semiconductor 9
Th er m al C al culati on and Mea surem ent
7 Thermal Calculation and Measurement
For the f ollowing dis cussions, PD= (VDDL x IDDL) + PI/O, where PI/O is the power dissipation of t he I/O
drivers.
NOTE
The VDDSYN power dissipation is negligible.
7.1 Estimati on with Junction-to-Ambient Thermal Resis tance
An estimation of the chip junction tempe r ature , TJ, in °C can be obta ined from the equa tion:
TJ = TA +(RθJA × PD)
Input leakage current, Vin = 5.5 V (Except TMS, TRST,
DSCK and DSDI pins) for 5-V tolerant pins 1Iin — 100 µA
Input leakage current, Vin = VDDH (Except TMS, TRST,
DSCK, and DSDI) IIn —10µA
Input leakage current, Vin = 0 V ( Except TMS, TRST,
DSCK and DSDI pins) IIn —10µA
Input capacitance2Cin —20pF
Output hi gh voltage, IOH = - 2.0 mA, VDDH = 3.0 V
Except XTAL and open drain pins VOH 2.4 — V
Output low volt age
IOL = 2.0 mA (CLKOUT)
IOL = 3.2 mA3
IOL = 5.3 mA4
IOL = 7.0 mA (Txd1/pa14, txd2/pa12)
IOL = 8.9 mA (TS, TA , TEA, BI, BB, HRESET, SRESET)
VOL — 0.5 V
1The PA[0:3], PA[8:11], PB15, PB[24:25]; PB[28:31], PC[4:7], PC[12:13], PC15, PD[3:15], TDI, TDO, TCK, TRST, TMS,
MII_TXEN, MII_MDIO are 5-V toler ant pins.
2Input capacitance i s peri odically sam pled.
3A(0:31), TSIZ0/REG, TS IZ 1 , D(0 :3 1 ), D P ( 0 :3 )/IRQ (3:6), RD/WR, BURST, R S V /IRQ2, IWP(0:1)/VFLS(0:1) , RXD3/PA11,
TXD3/PA10, RXD4/PA9, TXD4/PA8, TIN3/BRGO3/CL K5/PA3, BRGCLK2/TOUT3/CLK6/ PA2, TIN4/BRGO4/CLK7/PA1,
TOUT4/CLK8/PA0, SPISEL/PB31, SPICLK/PB30, SPIMOSI/PB29, BRGO4/SPIMISO/PB28, SMTXD1/PB25,
SMRXD1/PB24, BRGO3/PB15, R TS1/DREQ0/PC15 , RT S3/PC13, RTS4/PC12, CTS3/PC7, CD3/PC6, CTS4/SDACK1/PC5,
CD4/PC4, MII-RXD3/PD1 5, MII-RX D2/PD14, MII -RXD1/PD13, MI I-MDC/PD12, MII -TXERR/ RXD3/PD11,
MII-RX0/TXD3/PD10, MII-TXD0/RXD4/PD9, MII-RXCLK/TXD4/PD8, MII-TXD3/PD5, MII-RXDV/RTS4/PD6,
MII-RXERR/RTS3/PD7, MII-TXD2/ REJECT3/PD4, MII- TXD1/REJECT4/ PD3, MII_CRS, MII_MDIO, MI I_TXEN, and MII _CO L
4BDIP/GPL_B(5), BR , BG, FR Z/ IR Q6 , CS(0 :5 ), CS(6) , C S (7), WE0/BS_B0/IORD, W E 1 /BS_B1/IOWR, WE2 /BS_B2/PCOE,
WE3/ BS_B3/PCWE, B S _A(0:3), GPL_A0/GPL_B0, OE/GPL_A1/GPL_B1, G P L _A(2:3)/GPL_B(2:3)/CS(2:3),
UPWAITA/GPL_A4, GPL_A5, ALE_A, CE1_A, CE2_A, DSCK, OP(0:1), OP2/MODCK1/STS, OP3/MODCK2/DSDO, and
BADDR(28:30)
Table 5. DC Electrical Specification s (continued)
Characteristic Symbol Min Max Unit