SN74LVC646APW

SN74LVC646APW from Texas Instruments is a Integrated Circuit Octal Bus Transceiver And Register With 3-State Outputs - General-purpose transceivers. The SN54LVC646A octal bus transceiver and register is designed for 2.7-V to 3.6-V V CC operation, and the SN74LVC646A octal bus transceiver and register is designed for 1.65-V to 3.6-V V CC operation. These devices consist of bus-transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate clock (CLKAB or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that are performed with the ’LVC646A devices. Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode, data present at thehigh-impedance port is stored in either register or in both. The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. DIR determines which bus receives data when OE is low. In the isolation mode (OE high), A data is stored in one register and B data can be stored in the other register. When an output function is disabled, the input function is still enabled and can be used to store and transmit data. Only one of the two buses, A or B, can be driven at a time. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V system environment. These devices are fully specified for partial-power-down applications using I off. The I off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. To ensure the high-impedance state during power up or power down, OE should be tied to V CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Series: 74LVC
Base Number: 74LVC646
Package: Tube
Standard Package: 60
RoHS: ROHS3 Compliant
REACH: Unaffected
MSL: Unlimited
ECCN: EAR99
HTSUS: 8542.39.0001

Integrated Circuits (ICs) / Logic / Buffers - Drivers - Receivers - Transceivers