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SCAN921226SLC Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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SCAN921226SLC Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 21 page Serializer Switching Characteristics (Continued) Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units t DIS DIN (0-9) Setup to TCLK R L =27Ω, C L=10pF to GND Figure 7 0ns t DIH DIN (0-9) Hold from TCLK 4.0 ns t HZD DO ± HIGH to TRI-STATE Delay R L =27Ω, C L=10pF to GND Figure 8 (Note 5) 310 ns t LZD DO ± LOW to TRI-STATE Delay 310 ns t ZHD DO ± TRI-STATE to HIGH Delay 510 ns t ZLD DO ± TRI-STATE to LOW Delay 6.5 10 ns t SPW SYNC Pulse Width R L =27Ω Figure 10 5*t TCP ns t PLD Serializer PLL Lock Time 510*t TCP 513*t TCP ns t SD Serializer Delay R L =27Ω, Figure 11 t TCP+ 1.0 t TCP+ 2.5 t TCP+ 3.5 ns t DJIT Deterministic Jitter R L = 27 Ω, C L=10pF to GND, (Note 6) 80 MHz -130 -40 +60 ps t RJIT Random Jitter 610 ps (RMS) Deserializer Timing Requirements for REFCLK Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units t RFCP REFCLK Period 12.5 T 33.3 ns t RFDC REFCLK Duty Cycle 30 50 70 % t RFCP /tTCP Ratio of REFCLK to TCLK 95 1 105 t RFTT REFCLK Transition Time 3 6 ns Deserializer Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Pin/Freq. Min Typ Max Units t RCP Receiver out Clock Period t RCP =tTCP Figure 11 RCLK 12.5 33.3 ns t CLH CMOS/TTL Low-to-High Transition Time CL=15pF Figure 5 Rout(0-9), LOCK, RCLK 1.2 4 ns t CHL CMOS/TTL High-to-Low Transition Time 1.1 4 ns t DD Deserializer Delay Figure 12 All Temp./ All Freq. 1.75*t RCP+1.25 1.75*t RCP+5.0 1.75*t RCP+8.5 ns Room Temp./3.3V/30MHz 1.75*t RCP+2.25 1.75*t RCP+5.0 1.75*t RCP+8.0 ns Room Temp./3.3V/80MHz 1.75*t RCP+2.25 1.75*t RCP+5.0 1.75*t RCP+8.0 ns t ROS ROUT Data Valid before Figure 13 RCLK 30MHz 0.4*t RCP 0.5*t RCP ns RCLK RCLK 80MHz 0.35*t RCP 0.5*t RCP ns t ROH ROUT Data valid after Figure 13 30MHz −0.4*t RCP −0.5*t RCP ns RCLK 80MHz −0.35*t RCP −0.5*t RCP ns t RDC RCLK Duty Cycle 45 50 55 % www.national.com 7 |
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