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XIO2000 数据表(PDF) 144 Page - Texas Instruments |
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XIO2000 数据表(HTML) 144 Page - Texas Instruments |
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144 / 150 page  Electrical Characteristics 132 November 2005 SCPS097B 7.10 PCI Bus Parameter Measurement Information † CLOAD includes the typical load-circuit distributed capacitance. CLOAD Test Point Timing Input (see Note A ) Out-of-Phase Output tpd 50% VDD 50% VDD VDD 0 V 0 V 0 V 0 V 0 V VOL th tsu VOH VOH VOL High-Level Input Low-Level Input tw VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES LOAD CIRCUIT VOLTAGE WAVEFORMS SETUP AND HOLD TIMES INPUT RISE AND FALL TIMES VOLTAGE WAVEFORMS PULSE DURATION tpd tpd tpd VLOAD IOH IOL From Output Under Test 90% VDD 10% VDD tf tr Output Control (low-level enabling) Waveform 1 (see Note B) Waveform 2 (see Note B) VOL VOH VOH − 0.3 V tPZL tPZH tPLZ tPHZ VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS VOL + 0.3 V 0 V 0 V ≈ 50% VDD ≈ 50% VDD ten tdis tpd tPZH tPZL tPHZ tPLZ CLOAD† (pF) IOL (mA) TIMING PARAMETER 30/50 12 −12 0 3 1.5 ‡ 30/50 12 12 −12 −12 LOAD CIRCUIT PARAMETERS = 50 Ω, where VOL = 0.6 V, IOL = 12 mA IOL 30/50 ‡ VLOAD −VOL IOH (mA) VLOAD (V) Data Input In-Phase Output Input (see Note A) VDD VDD VDD 50% VDD 50% VDD 50% VDD 50% VDD VDD VDD 50% VDD 50% VDD 50% VDD 50% VDD VDD 50% VDD 50% VDD 50% VDD 50% VDD 50% VDD 50% VDD NOTES: A. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by pulse generators having the following characteristics: PRR = 1 MHz, ZO = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. For tPLZ and tPHZ, VOL and VOH are measured values. 50% VDD Figure 7−1. Load Circuit And Voltage Waveforms |
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