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W3EG72126S262AJD3 Datasheet(PDF) 9 Page - White Electronic Designs Corporation |
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W3EG72126S262AJD3 Datasheet(HTML) 9 Page - White Electronic Designs Corporation |
9 / 15 page White Electronic Designs W3EG72126S-D3 -JD3 -AJD3 9 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com November 2004 Rev. 3 PRELIMINARY DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS (continued) 0°C ≤ TA ≤ +70°C; VCC = +2.5V ±0.2V, VCCQ = +2.5V ±0.2V AC Characteristics 335 262 263/265 202 Parameter Symbol Min Max Min Max Min Max Min Max Units Notes ACTIVE to READ or WRITE delay tRCD 15 15 15 15 ns PRECHARGE command period tRP 15 15 15 15 ns DQS read preamble tRPRE 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 tCK 19 DQS read postamble tRPST 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tCK ACTIVE bank a to ACTIVE bank b command tRRD 12 15 15 15 ns DQS write preamble tWPRE 0.25 0.25 0.25 0.25 tCK DQS write preamble setup time tWPRES 0000 ns 10,11 DQS write postamble tWPST 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tCK 9 Write recovery time tWR 15 15 15 15 ns Internal WRITE to READ command delay tWTR 1111 tCK Data valid output window NA tQH-tDQSQ tQH-tDQSQ tQH-tDQSQ tQH-tDQSQ ns 13 REFRESH to REFRESH command interval tREFC 70.3 70.3 70.3 70.3 μs 12 Average periodic refresh interval tREFI 7.8 7.8 7.8 7.8 μs 12 Terminating voltage delay to VCC tVTD 0000 ns Exit SELF REFRESH to non-READ command tXSNR 75 75 75 75 ns Exit SELF REFRESH to READ command tXSRD 200 200 200 200 tCK |
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