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PC87393 Datasheet(PDF) 143 Page - National Semiconductor (TI) |
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PC87393 Datasheet(HTML) 143 Page - National Semiconductor (TI) |
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143 / 148 page  9.0 Device Characteristics (Continued) 143 www.national.com 9.4.6 Modem Control Timing 9.4.7 FDC Write Data Timing tDRP tICP tWDW Values Symbol Parameter Min Max Unit tL RI2,1 Low Time 10 ns tH RI2,1 High Time 10 ns tSIM Delay to Set IRQ from Modem Input 40 ns Symbol Parameter Min Max Unit tHDH HDSEL Hold from WGATE Inactive1 1. Not tested. Guaranteed by design. 100 µs tHDS HDSEL Setup to WGATE Active1 100 µs tWDW Write Data Pulse Width See tDRP,tICP and tWDW values in table below Data Rate tDRP tICP tICP Nominal tWDW tWDW Minimum Unit 1 Mbps 1000 6xtCP 1 1. tCP is the clock period defined in the Clock Timing section of this chapter. 125 2 x tICP 250 ns 500 Kbps 2000 6xtCP 1 125 2 x tICP 250 ns 300 Kbps 3333 10 x tCP 1 208 2 x tICP 375 ns 250 Kbps 4000 12 x tCP 1 250 2 x tICP 500 ns CTS, DSR, DCD INTERRUPT (Read MSR) RI tSIM tSIM tSIM tH tL (Read MSR) tHDS tHDH tWDW HDSEL WGATE WDATA |
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