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DS2172 Datasheet(PDF) 16 Page - Dallas Semiconductor |
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DS2172 Datasheet(HTML) 16 Page - Dallas Semiconductor |
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16 / 21 page ![]() DS2172 16 of 21 AC CHARACTERISTICS - PARALLEL PORT (0ºC to 70ºC for DS2172T; VDD=5V ±10%; -40ºC to +85ºC for DS2172TN; VDD=5V ±10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Cycle Time tCYC 200 ns Pulse Width, DS Low or RD High PWEL 100 ns Pulse Width, DS High or RD Low PWEH 100 ns Input Rise/Fall Times tR, tF 20 ns R/ W Hold Times tRWH 10 ns R/ W Setup Time Before DS High tRWS 50 ns CS Setup Time Before DS, WR or RD Active tCS 20 ns CS Hold Time tCH 0ns Read Data Hold Time tDHR 550 ns Write Data Hold Time tDHW 0ns Mux'ed Address Valid to AS or ALE Fall tASL 15 ns Mux'ed Address Hold Time tAHL 10 ns Delay Time DS, WR or RD to AS or ALE Rise tASD 20 ns Pulse Width AS or ALE High PWASH 30 ns Delay Time, AS or ALE to DS, WR or RD tASED 10 ns Output Data Delay Time from DS or RD tDDR 550 ns Data Setup Time tDSW 50 ns |
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