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MPC8308VMADDA Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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MPC8308VMADDA Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 88 page MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0 10 Freescale Semiconductor DDR2 SDRAM 6DDR2 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 GVDD(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 V 1 I/O reference voltage MVREF 0.49 × GV DD 0.51 × GV DD V2 I/O termination voltage VTT MVREF –0.04 MVREF + 0.04 V 3 Input high voltage VIH MVREF + 0.125 GVDD +0.3 V — Input low voltage VIL –0.3 MVREF –0.125 V — Output leakage current IOZ –9.9 9.9 μA4 Output high current (VOUT = 1.420 V) IOH –13.4 — mA — Output low current (VOUT = 0.280 V) IOL 13.4 — mA — 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 ≤ V OUT ≤ 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 68 pF 1 Delta input/output capacitance: DQ, DQS, DQS CDIO —0.5 pF 1 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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