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| 74LS247资料 | |
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74LS247 PDF Download |
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File Size : 116 KB
Manufacturer:ON Description:Port 2 (A8C15), I/O. Port 2 is a bidirectional I/O port. The reset condition of Port 2 is logic high. In this state, a weak pullup holds the port high. This condition also serves as an input mode, since any external circuit that writes to the port will overcome the weak pullup. When software writes a 0 to any port pin, the DS87C520/DS83C520 will activate a strong pulldown that remains on until either a 1 is written or a reset occurs. Writing a 1 after the port has been at 0 will cause a strong transition driver to turn on, followed by a weaker sustaining pullup. Once the momentary strong driver turns off, the port again becomes both the output high and input state. As an alternate function Port 2 can function as MSB of the external address bus. This bus can be used to read external ROM and read/write external RAM memory or peripherals. |
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| 1PCS | 100PCS | 1K | 10K | ||
| 价 格 | |||||
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型 号：74LS247 厂 家：ON 封 装：SOP16 批 号：07+ 数 量：1100 说 明：100%真实库存，原装，部分现货 |
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运 费： 所在地：深圳 新旧程度： |
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| 联系人：陈小姐 |
| 电 话：0755-83605789 |
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| 公司地址： 广东深圳市福田区华强北（振华路）赛格高科德电子市场A1848室 |
