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M48T86 数据表(PDF) 13 Page - STMicroelectronics |
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M48T86 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 36 page  M48T86 Operation 13/36 Table 2. AC characteristics Symbol Parameter(1) 1. Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V (except where noted). M48T86 Unit Min Typ Max tCYC Cycle time 160 ns tDSL Pulse width, data strobe low or R/W high 80 ns tDSH Pulse width, data strobe high or R/W low 55 ns tRWH R/W hold time 0 ns tRWS R/W setup time 10 ns tCS Chip select setup time 5 ns tCH Chip select hold time 0 ns tDHR READ data hold time 0 25 ns tDHW WRITE data hold time 0 ns tAS Address setup time 20 ns tAH Address hold time 5 ns tDAS Delay time, data strobe to address strobe rise 10 ns tASW Pulse width address strobe high 30 ns tASD Delay time, address strobe to data strobe rise 35 ns tOD Output data delay time from data strobe rise 50 ns tDW WRITE setup time 30 ns tBUC Delay time before update cycle 244 µs tPI (2) 2. See Table 4 on page 18. Periodic interrupt time interval – – – tUC Time of update cycle 1 µs |
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