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74LVX4245WM bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI) |
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74LVX4245WM bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI) |
6 / 8 page Applications Mixed Mode Dual Supply Interface Solution LVX4245 is designed to solve 3V5V interfacing issues when CMOS devices cannot tolerate IO levels above their applied VCC If an IO pin of 3V ICs is driven by 5V ICs the P-Channel transistor in 3V ICs will conduct causing current flow from IO bus to the 3V power supply The resulting high current flow can cause destruction of 3V ICs through latch- up effects To prevent this problem a current limiting resis- tor 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 1 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 TRI-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 2 the designer could use this device in either a 3V system or a 5V system without any further work to re-layout the board TLF11540 – 4 FIGURE 2 LVX4245 Pin Arrangment is Compatible to 20-Pin 74 Series 245 TLF11540 – 5 FIGURE 1 LVX4245 Fits into a System with 3V Subsystem and 5V Subsystem 6 |
Số phần tương tự - 74LVX4245WM |
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Mô tả tương tự - 74LVX4245WM |
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