74VHC245MX

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74VHC245MX is a member of the 74VHC CMOS Logic family, which is known for its high-speed performance and low-power dissipation. The device consists of eight non-inverting buffers with 3-state outputs and is designed for 2.3 Ved, 1.65V–3.6V Vcc and operation from 0 °C to 70 °C. The 74VHC245MX is suitable for connections between the normal TTL and other digital circuit. The power drain is reduced as the state of output is tri-state connecting the output in a high impedance state and this device is also used to drive transmission lines and other advanced applications.

The 74VHC245M is a logic-level converter and can be used for bidirectional data transfer between two different logic families. It is a 8-bit unbuffered non inverting bus transceiver which is used for transferring data between the logic families. It is a 3-state device and shares two enable pins in which the active-low enable pins (E1, E2) are used to control the direction of data flow i.e. whether data should be transmitted from one side or should be received from the other side. The enable pins should preferably be connected to a logic low level (near to 0.0V) in order to transmit the data, else a logic \'high\' level (near to Vcc) should be used to receive the data. Additionally, there is an obvious-state output enable pin which is used to control the output tri-state mode of the device.

The use of a 74VHC245MX is split into 4 major areas of applications - bus drivers, line drivers, transmission line drivers and communication line drivers. In bus drivers application, these can be used for driving high capacitance loads like buses in both TTL to CMOS, and CMOS to TTL directions, thus being ideal for multiplexing of data and address signals. Additionally, its varied resistance to noise minimizes the unwanted reflection from high capacitance loads, thus providing cleaner data transfer.

In line drivers application, these devices are used to drive the logic level gate outputs of integrated circuits, thus functioning more efficiently in different noisy environments. These line drivers can also be used for driving both the load and their own external power supplies, like the off-chip power buses. This property facilitates the long distances of data communication.

In transmission line drivers application, 74VHC245MX drives high capacitance loads of transmission lines like twisted pair cables or coaxial cables, thus minimizing the chances of data corruption due to reflections and other environment noise. The use of integrated transmission line drivers cuts down on the need for multiple amplification stages and thus saves power, cost and size.

In communications line drivers application, these devices are used to drive either a microcontroller’s output port, or an RS-232, 422, or 485 serial link due to their low output noise and high drive capability. Communication line drivers maximize output noise and protect many non-standard logic chips with high drive capability.

Therefore, the 74VHC245MX is a device suitable for all sorts of logic level conversions, providing the utmost reliability and lower power consumption than other existing logic-level translators. It is a perfect choice for applications requiring high-speed R/W operation, bidirectional data flow, low EMI and low active, static and dynamic power consumption.

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