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PCI7421 数据表(PDF) 39 Page - Texas Instruments |
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PCI7421 数据表(HTML) 39 Page - Texas Instruments |
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39 / 298 page  2−13 2.1 Detailed Terminal Descriptions Please see Table 2−4 through Table 2−19 for more detailed terminal descriptions. The following list defines the column headings and the abbreviations used in the detailed terminal description tables. • I/O Type: − I = Digital input − O = Digital output − I/O = Digital input/output − AI = Analog input − PWR = Power − GND = Ground • Input/Output Description: − AF = Analog feedthrough − TTLI1 = 5-V tolerant TTL input buffer − TTLI2 = 5-V tolerant TTL input buffer with hysteresis − TTLO1 = 5-V tolerant low-noise 4-mA TTL output buffer − PCII1 = 5-V tolerant PCI input buffer − PCII2 = 5-V tolerant PCI input buffer − PCII3 = 5-V tolerant PCI input buffer − PCII4 = 5-V tolerant PCI input buffer − PCII5 = 5-V tolerant PCI input buffer − PCIO2 = 5-V tolerant PCI output buffer − PCIO4 = 5-V tolerant PCI output buffer − PCIO5 = 5-V tolerant PCI output buffer − LVCI1 = LVCMOS input buffer − LVCO1 = Low-noise 4-mA LVCMOS open drain output buffer − LVCO2 = Low-noise 4-mA LVCMOS open drain output buffer − LVCO3 = Low-noise 8-mA LVCMOS open drain output buffer • PU/PD signifies whether the terminal has an internal pullup or pulldown resistor. These pullups are disabled and enabled by design when appropriate to preserve power. − PD1 = 20- µA failsafe pulldown − PD2 = 100- µA failsafe pulldown − PU1 = 200- µA pullup − PU2 = 100- µA pullup − PU3 = 100- µA pullup − PU4 = 100- µA pullup − SW = Switchable 50- µA pullup/200-µA pulldown implemented depending on situation • Power Rail signifies which rail the terminal is clamped to for protection. • External Components signifies any external components needed for normal operation. • Pin Strapping (If Unused) signifies how the terminal must be implemented if its function is not needed. The terminals are grouped in tables by functionality, such as PCI system function, power-supply function, etc. The terminal numbers are also listed for convenient reference. |
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