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54LVXC4245J-QML 데이터시트(PDF) 7 Page - National Semiconductor (TI) |
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54LVXC4245J-QML 데이터시트(HTML) 7 Page - National Semiconductor (TI) |
7 / 9 page Configurable I/O Application for mixed or unknown Voltages (Continued) Additionally, the LVXC4245 solves two other unique prob- lems: when interfacing to non-TTL compatible signals or when interfacing to components or busses which are pulled up to 5V. In the first case, when interfacing to non-TTL inputs such as ACMOS or HCMOS where full 5V signal swings are needed, the LVXC4245 can act as an amplifier to translate 0 volt to 3 volt signals up to 0 volt to 5 volt levels as shown in Figure 2. In the second case, when interfacing to busses which use re- sistive pull-ups to 5V, it is desirable to avoid connecting 3V devices directly to the bus to avoid excessive power con- sumption. The LVXC4245 can be used to translate the 3 volt signals to 5 volt levels and eliminate the power consumed by the pull-up resistors. DS101033-5 FIGURE 2. LVXC4245 amplifies 3V signals for interfacing to non-TTL inputs. DS101033-6 FIGURE 3. LVXC4245 for interfacing to 5V busses with pull-ups minimizes power consumption. www.national.com 7 |
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