The SN54LVC646A octal bus transceiver and register is designed for 2.7-V to 3.6-V VCC operation.
This device consists 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 shows the four fundamental bus-management functions that are performed with the SN54LVC646A device.
Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode, data present at the high-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 still is 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 this device as a translator in a mixed 3.3-V/5-V system environment.
This device is fully specified for partial-power-down applications using Ioff. The Ioff 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 VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver
| SN54LVC646A-SP | |
| Voltage Nodes (V) | 3.3,2.7,2.5,1.8 |
| Vcc range (V) | 2.0 to 3.6 |
| Input Level | 0.0 to 5.5 |
| Output Level | LVTTL |
| Output Drive (mA) | 24 |
| No. of Outputs | 8 |
| No. of Bits | 8 |
| Static Current | 0.01 |
| tpd max (ns) | 7.4 |
| Technology Family | LVC |
| Rating | Space |
| 器件 | 状态 | 温度 | 价格（美元） | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| 5962-9762601VKA | ACTIVE | -55 to 125 | 185.90 | 1ku | CFP (W) | 24 | 1 | TUBE |
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| 5962-9762601VKA | TBD | A42 | N/A for Pkg Type | 5962-9762601VKA | 5962-9762601VKA |