Diodes Incorporated has announced two new ICs – 74LVC2T45 and 74LVCH2T45. The devices provide logic levels voltage translation between devices that operate from different supply rails. The 74LVC(H)2T45 have dual power supplies and allow translation between 1.2 V and 5.5 V.
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The direction pin (DIR) and Port A consist of pins 1A and 2A and have logic levels in relation to VCC(A). Port B consists of pins 1B and 2B and has logic levels related to VCC(B). When a HIGH logic level is applied to the direction pin, the port A pins become inputs and the port B pins become outputs. Conversely, the roles of the ports are reversed when the direction pin is asserted LOW.
If either of the power supplies are at zero volts, all ports go into a high impedance state and allow for power down signal isolation. The 74LVCH2T45 is a variant that includes a bus-hold feature at each input, maintaining the previous logic level and ensuring a valid logic level is always present. This eliminates the need for additional resistors for unused or disconnected inputs.
Both are available in the tiny X2-DFN1210-8 and X2-DFN-1410-8 packages.
Applications:
- Cell Phones, Tablets, and E-Readers
- PCs, Notebooks, and Ultrabooks
- Networking, Routers, and Gateways
- TV, DVD, DVR and Set-Top Boxes
- Personal Navigation/GPS
- MP3 Players and Cameras
