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DS90C241 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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DS90C241 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 21 page Serializer Timing Requirements for TCLK (Continued) Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units t JIT TCLK Input Jitter (Note 9) 33 ps (RMS) Serializer Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units t LLHT LVDS Low-to-High Transition Time R L = 100 Ω, (Figure 3) C L =10pFtoGND VODSEL = L 0.6 ns t LHLT LVDS High-to-Low Transition Time 0.6 ns t DIS DIN (23:0) Setup to TCLK R L = 100 Ω, C L =10pFtoGND (Note 8) 5ns t DIH DIN (23:0) Hold from TCLK 5ns t HZD DOUT ± HIGH to TRI-STATE Delay R L = 100 Ω, C L =10pFtoGND (Figure 7) (Note 4) 15 ns t LZD DOUT ± LOW to TRI-STATE Delay 15 ns t ZHD DOUT ± TRI-STATE to HIGH Delay 200 ns t ZLD DOUT ± TRI-STATE to LOW Delay 200 ns t PLD Serializer PLL Lock Time R L = 100 Ω, (Figure 8)10 ms t SD Serializer Delay R L = 100 Ω, (Figure 9) VODSEL = L, TRFB = H 3.5T + 2.85 3.5T +10 ns R L = 100 Ω, (Figure 9) VODSEL = L, TRFB = L 3.5T + 2.85 3.5T +10 ns TxOUT_E_O TxOUT_Eye_Opening (respect to ideal) 5–35 MHz (Figure 14) (Notes 8, 9, 13) 0.75 UI (Note 10) 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 (Note 8) RCLK 28.6 200 ns t RDC RCLK Duty Cycle RCLK 45 50 55 % t CLH LVCMOS Low-to-High Transition Time C L =8pF (lumped load) (Figure 4) ROUT [23:0], LOCK, RCLK 2.5 3.5 ns t CHL LVCMOS High-to-Low Transition Time 2.5 3.5 ns t ROS ROUT (7:0) Setup Data to RCLK (Group 1) (Figure 11) ROUT [7:0] (0.40)* t RCP (29/56)*t RCP ns t ROH ROUT (7:0) Hold Data to RCLK (Group 1) (0.40)* t RCP (27/56)*t RCP ns t ROS ROUT (15:8) Setup Data to RCLK (Group 2) (Figure 11) ROUT [15:8], LOCK (0.40)* t RCP 0.5*t RCP ns t ROH ROUT (15:8) Hold Data to RCLK (Group 2) (0.40)* t RCP 0.5*t RCP ns t ROS ROUT (23:16) Setup Data to RCLK (Group 3) (Figure 11) ROUT [23:16] (0.40)* t RCP (27/56)*t RCP ns t ROH ROUT (23:16) Hold Data to RCLK (Group 3) (0.40)* t RCP (29/56)*t RCP ns www.national.com 4 |
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