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DS25C400 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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DS25C400 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 26 page Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. (Continued) Symbol Parameter Conditions Min Typ (Note 2) Max Units SERIALIZER DR DO Transmit Data Rate Data Rate at DO± High Data Rate Mode (EN_HDR = 1) 2.125 2.5 Gbps Low Data Rate Mode (EN_HDR = 0) 1.0625 1.25 Gbps V ODS Output Differential Voltage Swing (DO+ − DO−) WITHOUT Pre-emphasis DO+, DO− are terminated by external 50 Ω to V DDHS PSEL1 = 0, PSEL0 = 0 850 1065 1280 mV p-p Output Differential Voltage Swing (DO+ − DO−) WITH Pre-emphasis DO+, DO− are terminated by external 50 Ω to V DDHS PSEL1 = 0, PSEL0 = 1 TBD 1330 TBD mV p-p PSEL1 = 1, PSEL0 = 0 TBD 1600 TBD PSEL1 = 1, PSEL0 = 1 TBD 1850 TBD V CM Output Common Mode Offset Voltage WITHOUT Pre-emphasis DO+, DO− are terminated by external 50 Ω to V DDHS PSEL1 = 0, PSEL0 = 0 −10% V DDHS −0.3 +10% V Output Common Mode Offset Voltage WITH Pre-emphasis DO+, DO− are terminated by external 50 Ω to V DDHS PSEL1 = 0, PSEL0 = 1 −10% V DDHS −0.37 +10% V PSEL1 = 1, PSEL0 = 0 V DDHS −0.43 PSEL1 = 1, PSEL0 = 1 V DDHS −0.50 R DO Output Resistance On-chip termination DO+ or DO− to V DDHS, RTERM = 249 Ω 45 50 55 Ω C DO Capacitance to GND DO+ or DO− to GND 1 pF t DO-X Serial Data Output Transition Time Measured between 20% and 80% of V ODS 100 120 160 ps JIT DO-DJ Serial Data Output Deterministic Jitter (Peak-to-Peak), (Notes 4, 5) Output K28.5 at 2.5 Gbps 0.1 0.13 UI JIT DO-RJ Serial Data Output Random Jitter (Peak-to-Peak), (Notes 4, 5) Output D21.5 at 2.5 Gbps 0.13 0.15 UI JIT DO-TJ Serial Data Output Total Jitter, (Notes 4, 5) Output K28.5 pattern at 2.5 Gbps at BER of 10 −12 0.2 0.25 UI t LAT-TX Transmit Latency Figure 2 Transmit K28.5 from TD[0–9] to DO± at 2.5 Gbps, EN_10B = 1 35 48 Bits Transmit K28.5 from TD[0–9] to DO± at 2.5 Gbps, EN_10B = 0 45 58 Bits t DO-LOCK Lock Time Time to achieve frequency lock to REFCLK. Output K28.5 at 2.5 Gbps. 0.5 ms DESERIALIZER DR RI Receive Data Rate High Data Rate (EN_HDR = 1) 2.125 2.5 Gbps Low Data Rate (EN_HDR = 0) 1.0625 1.25 Gbps VIDS RI Differential Input Voltage RI+ – RI− 200 1500 mV p-p R RI Input Termination to V DDHS On-chip termination RI+ to RI− to V DDHS EN_RAC = 0, RTERM = 249 Ω: 455055 Ω www.national.com 5 |
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