MPC8610EC datasheet(28/96 Pages) FREESCALE

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MPC8610 Integrated Host Processor Hardware Specifications, Rev. 0

Electrical Characteristics

Freescale Semiconductor

Table 17 provides the DDR capacitance when GVDD (typ)=2.5 V.

Table 18 provides the current draw characteristics for MVREF.

2.6.2

DDR SDRAM AC Electrical Characteristics

This section provides the AC electrical characteristics for the DDR/DDR2 SDRAM interface.

2.6.2.1

DDR SDRAM Input AC Timing Specifications

Table 19 provides the input AC timing specifications for the DDR2 SDRAM when GVDD(typ)=1.8 V.

Output high current (VOUT = 1.95 V)

IOH

–16.2

—

Output low current (VOUT = 0.35 V)

IOL

16.2

—

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 17. DDR SDRAM Capacitance for GVDD (typ) = 2.5 V

Parameter/Condition

Symbol

Min

Max

Unit

Notes

Input/output capacitance: DQ, DQS

CIO

Delta input/output capacitance: DQ, DQS

CDIO

—0.5

Note:

1. This parameter is sampled. GVDD = 2.5 V ± 0.125 V, f = 1 MHz, TA =25°C, VOUT = GVDD/2, VOUT (peak-to-peak) = 0.2 V.

Table 18. Current Draw Characteristics for MVREF

Parameter/Condition

Symbol

Min

Max

Unit

Notes

Current draw for MVREF

IMVREF

—

500

μA1

Note:

1. The voltage regulator for MVREF must be able to supply up to 500 μA current.

Table 19. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface

At recommended operating conditions.

Parameter

Symbol

Min

Max

Unit

AC input low voltage

VIL

—MVREF – 0.25

AC input high voltage

VIH

MVREF + 0.25

—

Table 16. DDR SDRAM DC Electrical Characteristics for GVDD (typ) = 2.5 V (continued)

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