MPC8308VMAFDA datasheet(10/88 Pages) FREESCALE

10 / 88 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1

Freescale Semiconductor

DDR2 SDRAM

This section describes the DC and AC electrical specifications for the DDR2 SDRAM interface. Note that

DDR2 SDRAM is GVDD(typ) = 1.8 V.

6.1

DDR2 SDRAM DC Electrical Characteristics

Table 13 provides the recommended operating conditions for the DDR2 SDRAM component(s) when

GVDD(typ) = 1.8 V.

Table 14 provides the DDR2 capacitance when GV

DD(typ) = 1.8 V.

Table 13. DDR2 SDRAM DC Electrical Characteristics for GVDD(typ) = 1.8 V

Parameter/Condition

Symbol

Min

Max

Unit

Notes

I/O supply voltage

GVDD

1.7

1.9

I/O reference voltage

MVREF

0.49

× GVDD

0.51

× GVDD

I/O termination voltage

VTT

MVREF –0.04

MVREF + 0.04

Input high voltage

VIH

MVREF +0.125

GVDD +0.3

—

Input low voltage

VIL

–0.3

MVREF – 0.125

—

Output leakage current

IOZ

–9.9

9.9

μA4

Output high current (VOUT = 1.420 V)

IOH

–13.4

—

Output low current (VOUT = 0.280 V)

IOL

13.4

—

Notes:

1. GVDD is expected to be within 50 mV of the DRAM GVDD at all times.

2. MVREF is expected to be equal to 0.5 × GVDD, and to track GVDD DC variations as measured at the receiver.

Peak-to-peak noise on MVREF may not exceed ±2% of the DC value.

3. VTT is not applied directly to the device. It is the supply to which far end signal termination is made and is expected to be

equal to MVREF. This rail should track variations in the DC level of MVREF.

4. Output leakage is measured with all outputs disabled, 0 V

≤ VOUT ≤ GVDD.

Table 14. DDR2 SDRAM Capacitance for GVDD(typ) = 1.8 V

Parameter/Condition

Symbol

Min

Max

Unit

Notes

Input/output capacitance: DQ, DQS, DQS

CIO

Delta input/output capacitance: DQ, DQS, DQS

CDIO

—0.5

Note:

1. This parameter is sampled. GVDD = 1.8 V ± 0.090 V, f = 1 MHz, TA =25°C, VOUT = GVDD/2, VOUT (peak-to-peak) = 0.2 V.

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