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HD74AC Datasheet(PDF) 7 Page - Hitachi Semiconductor |
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HD74AC Datasheet(HTML) 7 Page - Hitachi Semiconductor |
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7 / 52 page  FACT Descriptions and Family Characteristics 6 We can calculate what current is required by looking at the Bergeron diagram. The quiescent voltage on the line will be within 100 mV of either rail. We know what voltage is required to guarantee a valid voltage at the receiver. This is either 70% or 30% of V CC. The formula for calculating the current and voltage required is | (V OQ–VI)/ZO | at VI. For VOQ = 100 mV, VIH = 3.85 V, VCC = 5.5 V and ZO = 50 Ω, the required I OH at 3.85 V is 75 mA. For the high-to-low transition, VQQ = 5.4 V, VIL = 1.65 V, and ZO = 50 Ω, I OL is 75 mA at 1.65 V. FACT’s I/O specifications include these limits. For transmission lines with impedances greater than 50 Ω, the current requirements are less and switching is still guaranteed. It is important to note that the typical 24 mA drive specification is not adequate to guarantee incident wave switching. The only way to guarantee this is to guarantee the current required to switch a transmission line from the output quiescent point to the valid V IN level. The performance charts in figures 5 to 7 are provided in order to aid the designer in determining dynamic output current drive of FACT devices with various power supply voltage. Current (mA) –50 –100 –150 –200 mA 0 –2 2 –1 1 0 3 4 5 6 7 VCC = 4.5 V VCC = 5.5 V VCC = 5.0 V Figure 5 Output Characteristics V OH/IOH, HD74AC00 Current (mA) 150 100 50 200 mA 0 –2 2 –1 1 0 3 4 5 6 7 VCC = 4.5 V VCC = 5.0 V VCC = 5.5 V Figure 6 Output Characteristics V OL/IOL, HD74AC00 |
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