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AM79C978VC/W 数据表(PDF) 24 Page - Advanced Micro Devices |
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AM79C978VC/W 数据表(HTML) 24 Page - Advanced Micro Devices |
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24 / 261 page ![]() 24 Am79C978 PIN DESIGNATIONS Listed By Driver Type The following table describes the various types of out- put drivers used in the Am79C978 controller. All IOL and IOH values shown in the table apply to 3.3 V signaling. A sustained tri-state signal is a low active signal that is driven high for one clock period before it is left floating. TX is a differential output driver. Its characteristics and those of XTAL2 output are described in the DC CHAR- ACTERISTICS section. For typical 5 V DC characteristics, please refer to DC Characteristics Over Commercial Operating Ranges section. Driver Name Type IOL (mA) IOH (mA) Load (pF) LED LED 12 0.4 50 O6 Totem Pole 6 0.4 50 OD6 Open Drain 6 NA 50 TS3 Tri-State 3 2 50 TS6 Tri-State 6 2 50 STS6 Sustained Tri-State 6 2 50 OMII1 Tri-State 4 4 50 OMII2 Tri-State 4 4 390 TSMII Tri-State 4 4 470 |
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