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74LVX4245QSC 数据表(PDF) 6 Page - Fairchild Semiconductor |
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74LVX4245QSC 数据表(HTML) 6 Page - Fairchild Semiconductor |
6 / 8 page www.fairchildsemi.com 6 Applications: Mixed Mode Dual Supply Interface Solution LVX4245 is designed to solve 3V/5V interfacing issues when CMOS devices cannot tolerate I/O levels above their applied VCC. If an I/O pin of 3V ICs is driven by 5V ICs, the P-Channel transistor in 3V ICs will conduct causing current flow from I/O bus to the 3V power supply. The resulting high current flow can cause destruction of 3V ICs through latchup effects. To prevent this problem, a current limiting resistor is used typically under direct connection of 3V ICs and 5V ICs, but it causes speed degradation. In a better solution, the LVX4245 configures two different output levels to handle the dual supply interface issues. The “A” port is a dedicated 5V port to interface 5V ICs. The “B” port is a dedicated port to interface 3V ICs. Figure 2 shows how LVX4245 fits into a system with 3V subsystem and 5V subsystem. This device is also configured as an 8-bit 245 transceiver, giving the designer 3-STATE capabilities and the ability to select either bidirectional or unidirectional modes. Since the center 20 pins are also pin compatible to 74 series 245, as shown in Figure 1, the designer could use this device in either a 3V system or a 5V system without any further work to re-layout the board. FIGURE 1. LVX4245 Pin Arrangement is Compatible to 20-Pin 74 Series 245 FIGURE 2. LVX4245 Fits into a System with 3V Subsystem and 5V Subsystem |
类似零件编号 - 74LVX4245QSC |
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类似说明 - 74LVX4245QSC |
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