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UPD70741 Datasheet(PDF) 97 Page - NEC |
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UPD70741 Datasheet(HTML) 97 Page - NEC |
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97 / 112 page  µPD70741 97 (8) DRAM, CBR self-refresh timing Parameter Symbol Conditions MIN. MAX. Unit CAS setup time 110 tCSR 1T - 20 ns REFRQ active delay (relative to CLKOUT ↑) 114 tDKREF 112 ns REFRQ inactive delay (relative to CLKOUT ↓) 115 tHKREF 112 ns CAS hold time 116 tCHS -10 ns RAS precharge time 117 tRPS 4.5T - 20 ns Remark T: tCYK CLKOUT (output) UCAS, LCAS (output) RAS (output) REFRQ (output) 114 115 110 116 110 116 117 TI TI TH TH TH TH TH TH |
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