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UPD30121 Datasheet(PDF) 44 Page - NEC |
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UPD30121 Datasheet(HTML) 44 Page - NEC |
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44 / 76 page  Data Sheet U14691EJ1V0DS00 44 µµµµPD30121 (b) CAS-before-RAS self-refresh parameter Parameter Symbol Condition MIN. MAX. Unit MRAS (0:3)# pulse width Note tRASS 100 µs MRAS (0:3)# precharge time tRPS 110 ns UCAS#/LCAS# hold time tCHS −50 ns Note The CAS-before-RAS self-refresh parameter is valid when tRASS exceeds 100 µs. MRAS (0:3)# Note 1 (output) UCAS#/LCAS# Note 2 (output) tRASS tRPS tCHS Notes 1. In 32-bit mode: Applied to MRAS (0:1)# pins In 16-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#/MRAS2#, and MRAS (0:1)# pins 2. In 32-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#MRAS2#, UCAS#, and LCAS# pins In 16-bit mode: Applied to UCAS# and LCAS# pins |
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